Thursday, 30 January 2014

Craig’s RESTORATIVE DENTAL MATERIALS THIRTEENTH EDITION

Craig’s
RESTORATIVE
DENTAL
MATERIALS
THIRTEENTH EDITION


EDITED BY
Ronald L. Sakaguchi, DDS, MS, PhD, MBA
Associate Dean for Research and Innovation
Professor
Division of Biomaterials and Biomechanics
Department of Restorative Dentistry
School of Dentistry
Oregon Health and Science University
Portland, Oregon
John M. Powers, PhD
Editor
The Dental Advisor
Dental Consultants, Inc
Ann Arbor, Michigan
Professor of Oral Biomaterials
Department of Restorative Dentistry and Biomaterials
UTHealth School of Dentistry
The University of Texas Health Science Center at Houston
Houston, Texas
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OH’S INTENSIVE CARE MANUAL Sixth Edition

OH’S INTENSIVE
CARE MANUAL
Sixth Edition
Edited by
Andrew D BerstenMB BS MD FANZCA FJFICM




PROFESSOR,DEPARTMENT OF CRITICALCAREMEDICINE,FLINDERS MEDICAL CENTRE AND SCHOOL OFMEDICINE,
FLINDERS UNIVERSITY,ADELAIDE,AUSTRALIA
Neil SoniMB ChbMD FANZCA FRCA FJFICM
CONSULTANT ININTENSIVECARE ANDANAESTHESIA,DIRECTOR AND LEAD CLINICIAN,INTENSIVECAREUNIT,
MAGILLDEPARTMENT OF ANAESTHESIA,INTENSIVECARE ANDPAINMANAGEMENT
HONORARYSENIORLECTURER,IMPERIALCOLLEGEMEDICALSCHOOL,CHELSEA ANDWESTMINSTERHOSPITAL,LONDON,UK
An imprint of Elsevier Limited
#2009, Elsevier Limited. All rights reserved.
The right of Andrew D Bersten and Neil Soni to be identified as editors of this work has been
asserted by them in accordance with the Copyright, Designs and Patents Act 1988.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any
form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the
prior permission of the Publishers. Permissions may be sought directly from Elsevier’s Health
Sciences Rights Department in Philadelphia, USA: telephone: (þ1) 215 238 7869; fax: (þ1) 215
238 2239; or, e-mail:healthpermissions@elsevier.com. You may also complete your request on-line via
the Elsevier homepage (http://www.elsevier.com), by selecting ‘Support and contact’ and then
‘Copyright and Permission’.
First published 1979
Second edition 1985
Third edition 1990
Fourth edition 1997
Fifth edition 2003
Sixth edition 2009
ISBN 978-0-7020-3096-3
British Library Cataloguing in Publication Data
A catalogue record for this book is available from the British Library
Library of Congress Cataloging in Publication Data
A catalog record for this book is available from the Library of Congress
Notice
Medical knowledge is constantly changing. Standard safety precautions must be followed, but as
new research and clinical experience broaden our knowledge, changes in treatment and drug
therapy may become necessary or appropriate. Readers are advised to check the most current
product information provided by the manufacturer of each drug to be administered to verify the
recommended dose, the method and duration of administration, and contraindications. It is the
responsibility of the practitioner, relying on experience and knowledge of the patient, to determine
dosages and the best treatment for each individual patient. Neither the Publisher nor the authors
assume any liability for any injury and/or damage to persons or property arising from this
publication.
The Publisher


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Wednesday, 29 January 2014

TRAUMA - INITIAL MANAGEMENT


TRAUMA  - INITIAL MANAGEMENT  
The initial management of the severely injured patient requires the surgeon to make rapid choices between various diagnostic and therapeutic interventions. In patients with a single severe injury there is a single set of priorities. In sharp contrast, a patient with critical injuries to several different organ systems often presents conflicting priorities in management. The thoughtful and accurate ordering of diagnostic and therapeutic interventions is critical to provide the optimal outcome and is perhaps the most important task of the trauma surgeon.[13]
Priorities in Initial Management
It is essential to begin with the assumption that the physiologic state of the patient is likely to deteriorate, perhaps abruptly, and that there is more than one serious injury present. It is also essential to realize that the most obvious or most dramatic injury may not be the most critical one. The trauma surgeon must adopt a very focused approach in which problems are addressed in strict order of their threat to life and function. Even a small delay for the treatment of a more minor injury cannot be tolerated. Within this focused approach, the surgeon must be constantly reassessing the situation as new data are obtained and be able to instantly change the focus and the order of priorities as new injuries or new findings are brought to light. The necessity to balance various conflicting priorities and accurately direct the initial diagnosis and treatment requires an approach to the patient as a whole, not as isolated organ systems. The overall management of the patient is best directed by one person who has the experience and authority to make difficult immediate decisions under stressful circumstances.
The correct prioritization of diagnostic and therapeutic interventions requires an assessment of the criticality of the intervention, the time frame in which action must be taken, and the cost of delay imposed on other injured systems. In general, establishing a patent airway with adequate oxygenation and ventilation are the primary concerns during resuscitation. Next the physiologic stabilization of the patient and control of significant hemorrhage must be addressed. Under these circumstances, optimal resuscitation of the patient is the best resuscitation for any specific organ system. Once immediately life-threatening problems have been controlled, management of possible brain injury is the next priority. Patients with a high likelihood of intracranial mass lesion requiring surgical intervention should undergo computed tomography (CT) of the head as soon as practicable. This group would include patients with Glasgow Coma Scale (GCS) score less than 8, especially in the presence of lateralizing signs. After management of brain injury has been undertaken, injuries causing less immediate threat to life and function should be addressed. Damage-control laparotomy for control of visceral injury, angiography for control of pelvic bleeding or to assess potential aortic injury, revascularization of an ischemic extremity, or management of a contaminated open fracture are examples of this type of problem. Treatment of injuries that present no immediate threat to life or function should be deferred until all other more critical issues have been resolved. This group of injuries is often orthopedic and includes closed-extremity fractures, spine fractures without neurologic compromise, facial fractures, and most soft tissue injuries.
Initial Evaluation of the Trauma Patient
The initial evaluation of the trauma patient consists of a rapid primary survey, aimed at identifying and treating immediately life-threatening problems. The primary survey should be completed in no more than 5 to 10 minutes. After all critical issues in the primary survey have been addressed, a full head-to-toe secondary survey is undertaken, with the goal of carefully examining the entire patient and identifying all injuries. The primary survey is conducted according to the mnemonic ABCDE: Airway, Breathing, Circulation, Disability, Exposure.
Airway
The crucial first step in managing an injured patient is securing an adequate airway. The mechanical removal of debris and the chin lift or jaw thrust maneuver, both of which pull the tongue and oral musculature forward from the pharynx, are often useful in clearing the airway of less severely injured patients. However, if there is any question about the adequacy of the airway, if there is evidence of severe head injury, or if the patient is in profound shock, more definitive airway control is necessary and appropriate. In the majority of patients this is accomplished by endotracheal intubation. Endotracheal intubation must be done rapidly, under the assumption of cervical spine instability, and in a fashion that does not induce increased intracranial pressure (ICP) in patients with head injury. This is best accomplished through a technique borrowed from surgical anesthesia known as rapid-sequence induction. In rapid-sequence induction, the patient is given a fast-acting anesthetic agent followed by a neuromuscular blocking agent. This combination of deep sedation and muscular relaxation allows careful intubation without cervical hyperextension and with minimal physiologic impact. The technique can be used with a number of different pharmacologic agents, depending on the knowledge and preferences of the individual practitioner. It is incumbent on the individual responsible for the procedure to be fully aware of the dosage, risks, and indications associated with the agents chosen. Excessive ventilation must be avoided after intubation, particularly in the hypovolemic patient, because it will increase mean intrathoracic pressures and compromise cardiac filling.
Although nasotracheal intubation has been widely suggested as a central modality, if not the primary modality, for emergency airway control in the past, we believe that nasotracheal intubation now should be used only rarely in the initial management of the injured patient. Nasotracheal intubation has a number of drawbacks, and the goal of safe endotracheal intubation with cervical spine precautions can be better accomplished using orotracheal intubation after rapid-sequence induction. 

In a few patients, endotracheal intubation is either impractical or impossible and a surgical airway is required. Indications for a surgical airway include massive maxillofacial trauma, anatomic distortion due to neck injury, and inability to visualize the vocal cords because of the presence of blood, secretions, or airway edema. Cricothyroidotomy is the preferred emergency procedure in the majority of circumstances. Actual tracheotomy may be indicated in select patients, such as those with laryngeal injuries. Either surgical procedure may be preceded by needle cricothyroidotomy with jet insufflation to improve oxygenation and allow the surgical procedure to be performed in a more orderly fashion. Emergency airway procedures are one of the few immediately lifesaving interventions that a surgeon is likely to be called on to perform. By their nature, such procedures are always done under suboptimal conditions and under high stress. It is important for the trauma surgeon to have fully planned the approach to secure a surgical airway before being called on to actually perform the procedure.
Breathing
After a secure airway has been established, the nature and adequacy of tidal ventilation is assessed. Inspection, palpation, and auscultation of the chest will demonstrate the presence of normal, symmetrical ventilatory effort and adequate bilateral tidal exchange. A supine anteroposterior chest radiograph is the primary diagnostic adjunct, demonstrating chest wall, pulmonary parenchymal, and pleural abnormalities. If there is decreased respiratory drive or severe chest wall injury, assisted ventilation is usually necessary. In addition to these mechanical factors, pulmonary parenchymal injury may lead to poor gas exchange and inadequate oxygenation, which necessitates mechanical ventilation. In either circumstance, the decision to provide assisted ventilation should be made early, as soon as it appears likely that the patient will not be able to sustain adequate oxygenation and ventilation, rather than at the point of overt ventilatory failure. Serial measurement of arterial blood gases should be used to monitor patients who are at risk and to assist in appropriate adjustment of the ventilator. It is especially important to prevent episodes of hypoxemia and hypoventilation in patients with associated head injury. There is also a body of evidence that suggests that hyperventilation may be detrimental to cerebral perfusion, accentuating the need for accuracy in ventilator management and vigilance in monitoring pH and Paco2.
Circulation
Once the airway is secured, and adequate breathing has been established, the focus shifts to the circulatory system. The primary goal is the identification and control of the hemorrhage. External hemorrhage is controlled by direct pressure on the wound, while the possibility of hemorrhage into the chest, abdomen, or pelvis is rapidly assessed. In patients with known pelvic fracture, a pneumatic antishock garment may be applied or circumferential compression can be accomplished with a bed sheet wrapped around the pelvis. While steps are being taken to control hemorrhage, at least two large-bore intravenous lines should be placed to allow fluid resuscitation. These lines are usually placed percutaneously in the vessels of the arm. If peripheral upper extremity access is inadequate, alternative routes include the placement of a large-bore venous line in the femoral vein at the groin or cutdown on the greater saphenous vein at the ankle. The subclavian vein is a poor site for emergency access in the hypovolemic patient and should be used only when other sites are not available. In small children, intraosseous infusion is the preferred alternative route if peripheral access cannot be established. Fluid resuscitation begins with a 1000-mL bolus of lactated Ringer’s solution for an adult or 20 mL/kg for a child. Response to therapy is monitored by clinical indicators, including blood pressure, skin perfusion, urinary output, and mental status. If there is no response or only transient response to the initial bolus, a second bolus should be given. If ongoing resuscitation is required after two boluses, it is likely that transfusion will be required, and blood should be administered early. The primary goal is the control of hemorrhage, and fluid resuscitation is of value only if active measures to control hemorrhage are in progress.
The clinician must be vigilant for possible causes of hypotension that require immediate intervention during the primary survey, such as pericardial tamponade or tension pneumothorax. If the pattern of injury and clinical presentation raise suspicion of such injuries, immediate steps must be taken, often before the chest radiograph is available. For example, if a patient presents with profound hemodynamic instability and there is a high suspicion of tension pneumothorax, a needle catheter decompression of the affected hemithorax should be performed immediately, without radiologic confirmation. Needle catheter decompression can be done with relative impunity, even bilaterally, in patients who are intubated and on positive-pressure ventilation. Much greater care must be taken in patients who are breathing spontaneously, because the process of needle catheter decompression can induce pneumothorax and worsen ventilatory dysfunction, especially if done on both sides of the chest.
Disability
The next step is a rapid examination to determine the presence and severity of neurologic injury. Level of consciousness measured by the Glasgow Coma Scale (GCS) score ( Table 20–2 ), pupillary response, and movement of extremities are evaluated and recorded. The assessment of neurologic function can be complicated by endotracheal intubation and administration of neuromuscular blocking agents. Pupillary response still can be assessed in the paralyzed patient, but the GCS measured under these circumstances is of no value. Intubation interferes with the assessment of the verbal component of the GCS, and there is no standard method for interpretation. If the GCS is used in intubated and paralyzed patients, notation should be made about the circumstances of the assessment to signify that the score may be inaccurate.

Table 20-2   -- The Glasgow Coma Scale
Eye Opening
No response
1
To painful stimulus
2
To verbal stimulus
3
Spontaneous
4
Best Verbal Response
No response
1
Incomprehensible sounds
2
Inappropriate words
3
Disoriented, inappropriate content
4
Oriented and appropriate
5
Best Motor Response
No response
1
Abnormal extension (decerebrate posturing)
2
Abnormal flexion (decorticate posturing)
3
Withdrawal
4
Purposeful movement
5
Obeys commands
6
Total
3–15


Exposure
The final step in the primary survey is to completely undress the patient and do a rapid head-to-toe examination to identify any injuries to the back, perineum, or other areas that are not easily seen in the supine, clothed position. Evidence of blunt trauma, fracture, and unexpected penetrating injuries is likely to be discovered.
After completion of the primary survey and after all immediately life-threatening injuries have been addressed, a complete physical examination is performed. This secondary survey is often done in a head-to-toe manner and includes ordering and collecting data from appropriate laboratory and radiologic tests. This time period also allows for the placement of additional lines, catheters (e.g., nasogastric tube or Foley), and monitoring devices. Data accumulated then can be used to reset priorities and plan definitive management of all injuries.

A number of minor injuries may not become apparent until the patient has been under medical care for 12 to 24 hours. By this time, competing pain from other major injuries has often subsided, and the patient has had an opportunity to take inventory of all bodily complaints. It is very important for the physician to return and perform a tertiary survey, which is another complete head-to-toe physical examination aimed at identifying injuries that may have escaped notice in the first several hours.



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PRINCIPLES OF ETHICS FOR EMERGENCY PHYSICIANS

PRINCIPLES OF ETHICS FOR EMERGENCY PHYSICIANS
Contents 
I.                   Principles of Ethics for Emergency Physicians
II.                 Ethics in Emergency Medicine: An Overview  
A.    Ethical Foundations of Emergency Medicine  
1. Moral pluralism  
2. Unique duties of emergency physicians  
3. Virtues in emergency medicine  
B. The Emergency Physician-Patient Relationship  
1. Beneficence  
2. Nonmaleficence  
3. Respect for patient autonomy  
4. Justice  


C. The Emergency Physician's Relations with Other Professionals  
1. Relationships with other physicians  
2. Relationships with nurses and paramedical personnel  
3. Impaired or incompetent physicians  
4. Relationships with business and administration  
5. Relationships with trainees  
6. Relationships with the legal system as an expert witness  
7. Relationships with the research community  
 D. The Emergency Physician's Relationships with Society  
1. The emergency physician and society  
2. Resource allocation and health care access: problems of justice  
3. Central tenets of the emergency physician's relationship with society:  


a. Access to emergency medical care is a fundamental right  
b. Adequate inhospital and outpatient resources must be available to guard emergency patients' interests  
c. Emergency physicians should promote prudent resource stewardship without compromising quality  
d. The duty to respond to prehospital emergencies and disasters  
e. The duty to oppose violence  
f. The duty to promote the public health

III. A Compendium of ACEP Policy Statements on Ethical Issues  
A. ACEP Business Arrangements  
B. Advertising and Publicity of Emergency Medical Care  
C. Agreements Restricting the Practice of Emergency Medicine  
D. Animal Use in Research  
E. Antitrust  
F. Appropriate Interhospital Patient Transfer  
G. Board Member and Officer Expert Testimony  
H. Collective Bargaining, Work Stoppages, and Slowdowns  
I. Conflict of Interest  
J. Delivery of Care to Undocumented Persons  
K. Disclosure of Medical Errors  
L. Discontinuing Resuscitation in the Out-of-Hospital Setting
M. Domestic Family Violence  
N. Emergency Physician Contractual Relationships  
O. Emergency Physician Rights and Responsibilities
P.  Emergency Physician Stewardship of Finite Resources  
Q. Emergency Physicians' Patient Care Responsibilities Outside of the Emergency Department  
R. EMTALA and On-call Responsibility for Emergency Department  Patients  
S.  Ethical Issues of Resuscitation  
T.  Expert Witness Guidelines for the Specialty of Emergency Medicine  
U. Fictitious Patients  
V. Filming in the Emergency Department  
W. Financial Conflicts of Interest in Biomedical Research  
X. Gifts to Emergency Physicians from the Biomedical Industry
Y Law Enforcement Information Gathering in the Emergency Department  
Z. Managed Care and Emergency Medical Ethics  
AA. Nonbeneficial ("Futile") Emergency Medical Interventions  
BB. Non-Discrimination  
CC. Patient Confidentiality  
DD. Patient-and Family-Centered Care and the Role of the Emergency Physician Providing  Care to a Child in the Emergency Department  
EE. Universal Health Care Coverage  
FF. Use of Patient Restraints

I.  PRINCIPLES OF ETHICS FOR EMERGENCY PHYSICIANS
The basic professional obligation of beneficent service to humanity is expressed in various physicians' oaths and codes of ethics. In addition to this general obligation, emergency physicians accept specific ethical obligations that arise out of the special features of emergency medical practice. The principles listed below express fundamental moral responsibilities of emergency physicians.
Emergency Physicians Shall:
1.      Embrace patient welfare as their primary professional responsibility.  
2.       Respond promptly and expertly, without prejudice or partiality, to the need for emergency medical care.
3.      Respect the rights and strive to protect the best interests of their patients, particularly the most vulnerable and those unable to make treatment choices due to diminished decision-making capacity.  
4.      Communicate truthfully with patients and secure their informed consent for treatment, unless the urgency of the patient's condition demands an immediate response.
5.      Respect patient privacy and disclose confidential information only with consent of the patient or when required by an overriding duty such as the duty to protect others or to obey the law.  
6.       Deal fairly and honestly with colleagues and take appropriate action to protect patients from health care providers who are impaired or incompetent, or who engage in fraud or deception.  
7.      Work cooperatively with others who care for, and about, emergency patients.  
8.      Engage in continuing study to maintain the knowledge and skills necessary to provide high quality care for emergency patients.  
9.      Act as responsible stewards of the health care resources entrusted to them.  
10.  Support societal efforts to improve public health and safety, reduce the effects of injury and illness, and secure access to emergency and other basic health care for all.



II.  ETHICS IN EMERGENCY MEDICINE: AN OVERVIEW    

A.  Ethical Foundations of Emergency Medicine
Although professional responsibilities have been a concern of physicians since antiquity, recent years have seen dramatic growth of both professional and societal attention to moral issues in health care. This increased interest in medical ethics is a result of multiple factors, including the greater technologic power of contemporary medicine, the medicalization of societal ills, the growing sophistication of patients, efforts to protect the civil rights of disadvantaged groups in our society, and the persistently rising costs of health care. All of these factors contribute to the significance, the complexity, and the urgency of moral questions in contemporary emergency medicine.
  1.  Moral pluralism
In addressing ethical questions, emergency physicians can consult a variety of sources for guidance. Professional oaths and codes of ethics are an important source of guidance, as are general cultural values, social norms embodied in the law, religious and philosophical moral traditions, and professional role models. All of these sources claim moral authority, and together they can inspire physicians to lead rich and committed moral lives. Problems arise, however, when different sources of moral guidance come into conflict in our pluralistic society. Numerous attempts have been made to find an overarching moral theory able to assess and prioritize moral claims from all of their various sources. Lacking agreement on the primacy of any one of these theories, we are left with a pluralism of different sources of moral guidance. The goal of bioethics is to help us understand, interpret, and weigh competing moral values as we see reasoned and defensible solutions to moral problems encountered in health care.
  2.  Unique duties of emergency physicians
The unique setting and goals of emergency medicine give rise to a number of distinctive ethical concerns. Among the special moral challenges confronted by emergency physicians are the following:  First, patients often arrive at the emergency department with acute illnesses or injuries that require immediate care. In these emergent situations, emergency physicians have little time to gather additional data, consult with others, or deliberate about alternative treatments. Instead, there is a presumption for quick action guided by predetermined treatment protocols. Second, patients in the emergency department often are unable to participate in decisions regarding their health care because of acute changes in their mental state. When patients lack decision-making capacity, emergency physicians cannot secure their informed consent to treatment. Third, emergency physicians typically have had no prior relationship with their patients in the emergency department. Patients often arrive in the emergency department unscheduled, in crisis, and sometimes against their own free will. Thus, emergency physicians cannot rely on earned trust or on prior knowledge of the patient's condition, values, or wishes regarding medical treatment. The patient's willingness to seek emergency care and to trust the physician is based on institutional and professional assurances rather than on an established personal relationship. Fourth, emergency physicians practice in an institutional setting, the hospital emergency department, and in close working relationships with other physicians, nurses, emergency medical technicians, and other health care professionals. Thus, emergency physicians must understand and respect institutional regulations and inter-professional norms of conduct. Fifth, in the United States, emergency physicians have been given a unique social role and responsibility to act as health care providers of last resort for many patients who have no other feasible access to care. Sixth, emergency physicians have a societal duty to render emergency aid outside their normal health care setting when such intervention may save life or limb. Finally, by virtue of their broad expertise and training, emergency physicians are expected to be a resource for the community in prehospital care, disaster management, toxicology, cardiopulmonary resuscitation, public health, injury control, and related areas. All of these special circumstances shape the moral dimensions of emergency medical practice.
  3. Virtues in emergency medicine
As noted above, the emergency department is a unique practice environment with distinctive moral challenges. To respond appropriately to these moral challenges, emergency physicians need knowledge of moral concepts and principles, and moral reasoning skills. Just as important for moral action as knowledge and skills, however, are morally valuable attitudes, character traits, and dispositions, identified in ethical theory as virtues. The virtuous person is motivated to act in support of his or her moral beliefs and ideals, and he or she serves as a role model for others. It is, therefore, important to identify and promote the moral virtues needed by emergency physicians. Fostering these virtues can be a kind of moral vaccination against the pitfalls inherent in emergency medical practice. Two timeless virtues of classic Western thought have essential roles in emergency medicine today: courage and justice.
Courage is the ability to carry out one’s obligations despite personal risk or danger. The courageous physician advocates for patients against managed care gatekeepers, demanding employers, interrogating police, incompetent trainees, dismissive consultants, self-absorbed families, and inquiring reporters, just to name a few. Emergency physicians exhibit courage when they assume personal risk to provide steadfast care for the violent, psychologically agitated criminal or the infected intravenous drug-user.
                                                               
Justice or fairness is the disposition to give such person what is due to him or her. Justice helps emergency physicians shepherd resources and employ therapeutic parsimony, refusing marginally beneficial care to some while guaranteeing a basic level of care for all others.
Additional virtues important to the practice of emergency medicine are vigilance, impartiality, trustworthiness, and resilience.
Vigilance is perhaps the virtue most emblematic of emergency medicine. In few other specialties are physicians called upon to assist patients and colleagues, immediately, twenty-four hours a day. Emergency physicians must be alert and prepared to meet unpredictable and uncontrollable demands, despite the circadian disharmony that threatens personal wellness.
The virtuous emergency physician practices impartiality by giving emergency patients an unconditional positive regard and treating them in an unbiased, unprejudiced way. Impartiality is most important in emergency medicine, since many emergency patients are poor or intoxicated and have poor hygiene, little education, and value systems at odds with that of the physician. Emergency physicians must treat perpetrators of violent crime with the same regard as victims and must resist the temptation to use disparaging remarks and gallows humor to ridicule psychotic patients or eccentric colleagues. Emergency physicians must be tolerant of people of different races, creeds, customs, habits, and lifestyle preferences.
Another essential virtue of emergency physicians is trustworthiness. Sick and vulnerable emergency patients are in a dependent relationship, forced to trust that emergency physicians will protect their interests through competence, informed consent, truthfulness, and the maintenance of confidentiality. Emergency physician clinical investigators must also be trustworthy, so that patient-subjects can trust they will not be exploited for power, profit, or prestige.
Finally, emergency physicians require the virtue of resilience in order to remain composed, flexible, and competent in the midst of clinical chaos. A tired, overstressed emergency department staff requires elasticity and optimism in order to stave off cynicism, resignation, disillusionment, numbing and professional burnout. Resilience enables emergency physicians to meet the challenges of difficult situations and enables them to encourage others to do so also. Excellence in emergency medicine requires flexibility, adaptability, and cooperative ability, allowing one to work well with patients and team members of all types. Resilience facilitates one’s ability to recover undaunted from change of misfortune. It is also manifest in an ability to not take personally every insult hurled by angry patients, bereft families, or disgruntled coworkers. Resilient persons are hardy, curious, purposeful, and adaptable; they trust in their own power to influence the course of events. Maintaining flexibility and coping with the typical circadian disharmony of emergency work is difficult, but the virtue of resilience, an appropriate sense of humor, and an unsinkable optimism can keep team spirit afloat even in the harshest emergency department environment.
  B.  The Emergency Physician-Patient Relationship
The physician-patient relationship is the moral center of medicine and the defining element in biomedical ethics. The unique nature of emergency medical practice and the diversity of emergency patients pose special moral challenges, as noted above. Broad moral principles can nevertheless help to categorize the emergency physician's fundamental ethical duties. This section will rely on a prominent principle-based approach to bioethical theory to describe emergency physician duties of beneficence, nonmaleficence, respect for autonomy, and justice.
  1.  Beneficence
Physicians assume a fundamental duty to serve the best interests of their patients by treating or preventing disease or injury and by informing patients about their conditions. Emergency physicians respond promptly to acute illnesses and injuries in order to prevent or minimize pain and suffering, loss of function, and loss of life. In pursuing these goals, emergency physicians serve the principle of beneficence, that is, they act for the benefit of their patients.
To secure the benefits of health care, patients freely disclose sensitive personal information to their physicians and allow physicians access to their bodies for examination and treatment.  Patients retain a strong interest, however, in protecting personal information from unauthorized disclosure and in preventing unnecessary intrusions on their physical privacy. Emergency physicians also respect the principle of beneficence, therefore, by protecting the privacy of their patients and the confidentiality of patient information. Personal information may only be disclosed when such disclosure is necessary to carry out a stronger conflicting duty, such as a duty to protect an identifiable third party from serious harm or to comply with a just law.
  2.  Nonmaleficence
At least as fundamental as the duty to benefit patients is the corresponding duty to refrain from inflicting harm. This duty, called the duty of nonmaleficence, is central to maintaining the emergency physician's integrity and the patient's trust. In contemporary emergency medical care, the potential for significant patient benefit is often inescapably linked with the potential for significant complications, side effects, or other harms. Emergency physicians cannot, therefore, avoid inflicting harms, but they can respect the principle of nonmaleficence by seeking always to maximize the benefits of treatment and to minimize the risk of harm. Physicians who lack appropriate training and experience in emergency medicine should not misrepresent themselves as emergency physicians. Likewise, in order to avoid unnecessary harm to patients, physicians without adequate training and knowledge should not practice without supervision in the emergency department or prehospital setting.
  3.  Respect for patient autonomy
Adult patients with decision-making capacity have a right to accept or refuse recommended health care, and physicians have a concomitant duty to respect their choices. This right is grounded in the moral principle of respect for patient autonomy and is expressed in the legal doctrine of informed consent. According to this doctrine, physicians must first inform the patient with decision-making capacity about the nature of his or her medical condition, treatment alternatives, and their expected consequences, and then obtain the patient’s voluntary consent to treatment. Emergency physicians also should respect decisions about a patient's treatment made by an appropriate surrogate decision maker, if the patient lacks decision-making capacity. Emergency physicians should be expert in the determination of decision-making capacity and the identification of appropriate surrogate decision makers if indicated.
Emergency physicians may treat without securing informed consent when immediate intervention is necessary to prevent death or serious harm to the patient. This is, however, a limited exception to the duty to obtain informed consent. When the initiation of treatment can be delayed without serious harm, informed consent should be obtained. Even if all the information needed for an informed consent cannot be provided, the emergency physician should, to whatever extent time allows, inform the patient (or, if the patient lacks capacity, a surrogate) about the treatment he or she is providing, and should not violate the explicit refusal of treatment, if the patient possesses decision-making capacity. In some cases, for personal and cultural reasons, patients ask that information be given to family or friends and that these third parties be allowed to make treatment choices for the patient. Patients may, if they wish, waive their right to informed consent or delegate decision-making authority for their care to others. Other exceptions to the duty to obtain informed consent apply when treatment is necessary to protect the public health and in a limited number of emergency medicine research protocols where obtaining consent is not feasible, provided that these research protocols are developed in concordance with federal guidelines and are approved by the appropriate review bodies.
To choose and act autonomously, patients must receive accurate information about their medical conditions and treatment options. Emergency physicians should relay sufficient information to patients for them to make an informed choice among various diagnostic and treatment options. Emergency physicians, when speaking to patients and families, must not overstate their experience or abilities, or those of their colleagues or institution. They should not overstate the potential benefits or success rates of the proposed treatment or research.
Significant moral issues may arise in the care of terminally ill patients. Emergency physicians should, for example, be willing to respect a terminally ill patient's wish to forgo life-prolonging treatment, as expressed in a living will or through a health care agent appointed under a durable power of attorney for health care. Emergency physicians should also be willing to honor "Do Not Attempt Resuscitation (DNAR)" orders and other end of life orders, appropriately executed to express the patient’s treatment preferences. Emergency physicians should understand established criteria for the determination of death and should be prepared to assist families in decisions regarding the potential donation of a patient's organs for transplantation.
  4.  Justice
In a broad sense, acting justly can be understood as acting with impartiality or fairness. In this sense, emergency physicians have a duty of justice to provide care to patients regardless of race, color, creed, gender, nationality, or other irrelevant properties. In a more specific sense, justice refers to the equitable distribution of benefits and burdens within a community or society. In the United States, public policy has established a limited right of patients to receive evaluation and stabilizing treatment for emergency medical conditions in hospital emergency departments. This policy indirectly ascribes to emergency physicians a social responsibility to provide necessary emergency care to all patients, regardless of ability to pay.  As noted in the Principles of Ethics for Emergency Physicians listed above, emergency physicians also have a duty in justice to act as responsible stewards of the health care resources entrusted to them. In carrying out this duty, emergency physicians must make careful judgments about the appropriate allocation of resources to maximize benefits and minimize burdens.
  C.  Emergency Physician Relationships with other Professionals
The practice of emergency medicine requires multidisciplinary cooperation and teamwork. Emergency physicians interact closely with a wide variety of other health care professionals, including emergency nurses, emergency medical technicians, and physicians from other specialties. General ethical rules governing these interactions include honesty, respect, appreciation of other perspectives and needs, and an overriding duty to maximize patient benefit.
  1.  Relationships with other physicians
Emergency physicians, in keeping patient benefit as a primary goal, must participate with other physicians in the provision of health care. Channels of communication between health care providers must remain open to optimize patient outcomes. However, communication may be interrupted when a sick patient requires immediate and definitive intervention before discussion with other physicians can take place. When practical, emergency physicians should cooperate with the patient’s primary care physician to provide continuity of care that satisfies the needs of the patient and minimizes burdens to other providers. Concerns regarding the extent of primary care rendered and referral required should be discussed with the primary physician whenever practical. Emergency physicians should support the development and implementation of systems that facilitate communications with primary care providers, consultants, and others involved in patient care.
On-call physicians, like emergency physicians, are morally obligated to provide timely and appropriate medical care. Emergency physicians should strive to treat consultants fairly and to make care as efficient as possible. The choice of consultant by the emergency physician may be guided by the preference of both the primary care physician and the patient or by institutional protocols. If multiple physicians work in the emergency department, each patient should have a clearly identified physician who is responsible for his or her care. Transfer of this responsibility should be clear to the patient, family, and staff involved, and should be clearly documented in the patient's medical record. When a patient is discharged from the emergency department, there must be a clear transfer of responsibility to the admitting or follow-up physician. This transfer must be clearly communicated to the patient when practical.
Contractual relationships between an emergency physician and an emergency physician group should be fair to all parties involved. Emergency medicine business, practices must be transparently ethical, and compensation should take into account both clinical and administrative services rendered by the physician. Disagreements arising from contractual arrangements should be arbitrated appropriately using a due process approach, whenever possible. Physicians with disabilities, injuries, or certain infections, such as HIV, may practice emergency medicine if their conditions do not inhibit proper performance or constitute a threat of harm to patients or others.  

2.  Relationships with nurses and paramedical personnel
Although the emergency physician assumes primary responsibility for patient welfare, emergency medicine is a team effort. For any specific patient, the physician must coordinate the efforts of nurses and support staff. To make the most effective use of the specific skills and expertise of emergency physicians, nurses, and other support staff, all should participate in the design and execution of emergency department care systems and protocols. Neither nurse practitioners nor physician assistants nor doctors in training should be used as emergency physician substitutes without adequate supervision and the consent of patients.
In the prehospital setting, emergency medical technicians of all levels rely on and rightfully expect the cooperation of emergency physicians with whom they work. Base station command physicians and other emergency providers should strive to work harmoniously with prehospital personnel to optimize care for the patient. Patient-centered, nonjudgmental, open communication is an important part of ethical medical command. Hospital and prehospital providers must respect patient confidentiality and the dignity of all personnel involved.
While emergency physicians may have greater expertise in scientific and technical matters, they share  equal expertise with other health care workers with regard to moral judgment. Physicians should encourage involvement of other providers and staff when difficult moral issues arise.  

3.  Impaired or incompetent physicians
The principle of nonmaleficence dictates that patients be protected from physicians who are incompetent or impaired. Emergency physicians should strive for technical and moral excellence and should refrain from fraud or deception. When any physician is found deficient in competence or character through appropriate peer review process, it is morally imperative to protect patients and to assist that physician in addressing and, if possible, overcoming such deficiencies. Corrective action may include internal discipline or remedial training. To provide adequate protection for their patients, health care institutions should require appropriate remediation before the impaired physician returns to practice.
Whenever an emergency physician believes that a colleague or consulting physician is incompetent or impaired by drugs, alcohol, or psychiatric or medical conditions, he or she should report the impaired physician to the appropriate institutional and regulatory authorities This should be done with discretion and sensitivity, and with a clear intention to help the impaired physician progress toward treatment and recovery. Physicians who conscientiously fulfill this responsibility should be protected from adverse political, legal, or financial consequences.  

4.  Relationships with business and administration
Emergency physicians should be advocates for emergency medical care as a fundamental right. Cost effective and efficient care is important so that resources can be available to provide care when it is needed. Cooperation with persons whose expertise is in the management and administration of health care systems is essential for provision of efficient care. A central role of physicians is to keep patient interests paramount in administrative and business decisions.
Incentives from businesses, including managed care organizations and biomedical drug and equipment manufacturers, should not unduly influence patient-centered clinical judgment. Gatekeeping activities that threaten patient safety are unethical, as are clauses that prevent physicians from informing patients about reasonable treatment alternatives. Physicians should not accept inappropriate gifts, trips, or other items from pharmaceutical or medical equipment companies or their representatives.  

 5.  Relationships with students, trainees, and other learners
Emergency physicians practicing in academic settings have important moral responsibilities to medical students, residents, prehospital care personnel, and learners of all types. Learners depend on their clinical supervisors and professors to teach them both the moral and technical aspects of emergency medical practice. In addition to providing explicit instruction, practicing emergency physicians should serve as role models for ethical behavior in their relationships with patients, students, research subjects, and other health care professionals.
Emergency medicine residents, medical students, and other health care professionals in training must not be mistreated, abused, or coerced for faculty self-interest. Teaching physicians must fulfill their obligation to teach and provide appropriate levels of supervision for students under their tutelage. Performance evaluations and letters of recommendation require a careful assessment of the learners’ strengths and weaknesses. Such evaluations must be accurate and clearly identify those individuals who may jeopardize patient care. Patient interests should not be compromised in the education process, and patients should never be required to participate in teaching activities or research without their consent. Emergency medicine residents must strive to master the discipline of emergency medicine, including understanding and accepting their moral duties to patients, profession, and society.
  6.  Relationships with the legal system as an expert witness
Expert witnesses are called on to assess the appropriateness of care provided by emergency physicians in matters of alleged medical malpractice and peer review. To assure that unbiased expert witness testimony is available to courts and panels that are trying to determine the applicable standard of care, the American College of Emergency Physicians (ACEP) encourages emergency physicians with sufficient expertise to testify in these venues. ACEP believes that these expert witnesses, at a minimum, should be emergency physicians who are certified in emergency medicine by the American Board of Emergency Medicine (ABEM), the American Osteopathic Board of Emergency Medicine (AOBEM), or, in pediatric emergency medicine, by the American Board of Pediatrics (ABP), and who have been actively practicing clinical emergency medicine for at least three years prior to the date of the incident under review.
As an expert witness, the physician has a clear ethical responsibility to be objective, truthful, and impartial, evaluating cases on the basis of generally accepted practice standards. It is unethical to overstate one’s opinions or credentials, to misrepresent maloccurence as malpractice, to provide false testimony, or to use the name of the College as prima facie evidence of expertise.
While reasonable compensation for a physician’s time is ethically acceptable, physicians should not provide expert testimony solely for financial gain lest this unduly influence their testimony.
  7.  Relationships with the research community
The emergency physician researcher should abide by basic moral and legal principles contained in federal, institutional, and professional guidelines that govern human and animal research. Basic ethical requirements for research studies include appropriate study goals, scientifically valid design, appropriate informed consent, confidentiality of records, and minimization of risks to subjects.  Approval from appropriate institutional review boards is required, but it remains the responsibility of the investigator to protect the rights and welfare of patient-subjects. Federal regulations allow institutional review boards to grant a limited waiver of informed consent in specific emergency medicine research studies, where multiple additional protections for patient-subjects are provided.  It is imperative that data be collected carefully, interpreted correctly, and reported accurately; research misconduct and fraud are grounds for disciplinary action and loss of funding. Emergency physician investigators should follow responsible authorship practices; for example, all co-authors should actively participate in all parts of the study, including literature review, study design, data collection, data analysis, and manuscript preparation.
  D.  The Emergency Physician's Relationship with Society    1.  The emergency physician and society
The emergency physician owes duties not only to his or her patients, but also to the society in which the physician and patients dwell. Though the emergency physician's duty to the patient is primary, it is not absolute. Emergency physician duties to the general public inform decision-making on a daily basis; for example, the emergency physician has duties to allocate resources justly, oppose violence, and promote the public health that sometimes transcend duties to individual patients. To fulfill demands of equity and justice, society may place limits on the authority of the physician to satisfy an individual patient's interests. Emergency physicians should be active in legislative, regulatory, institutional, and educational pursuits that promote patient safety and quality emergency care.
  2.  Resource allocation and health care access: problems of justice
Both society and individual emergency physicians confront questions of justice in deciding how to distribute the benefits of health care and the burdens of financing that care among the various members of the society. Emergency physicians routinely address these issues when they assign order of priority for treatment and choose appropriate diagnostic and treatment resources. In making these judgments, emergency physicians must attempt to reconcile the goals of equitable access to health care and just allocation of health care with the increasing scarcity of resources and the need for cost containment.

  3.  Central Tenets Of The Emergency Physician's Relationship With Society   

a.  Access to emergency medical care is a fundamental right
As noted above, US public policy, as articulated in the federal Emergency Medical Treatment and Active Labor Act (EMTALA), has established access to quality emergency care as an individual right that should be available to all who seek it. Recognizing that emergency care makes a substantial contribution to personal well-being, emergency physicians endorse this right and support the universal access to emergency care. Denial of emergency care or delay in providing emergency services on the basis of race, religion, sexual orientation, real or perceived gender identity, ethnic background, social status, type of illness or injury, or ability to pay is unethical. Emergency physicians should act as advocates for the health needs of indigent patients, assisting them in finding appropriate care. Insurers, including managed care organizations, must support insured patients' access to emergency medical care for what a prudent layperson would reasonably perceive as an emergency medical condition. Society, through its political process, must adequately fund emergency care for all who need it.
Decisions to limit access to care may be made only when the resources of the emergency department are depleted. If overcrowding limits access to care, that limit must be applied equitably, unless the hospital has a unique community resource such as a trauma center, in which case the selection of a special category of patient may be acceptable.
Prehospital care is an essential societal good that emergency physicians, in conjunction with government, industry, and insurers must continue to make available to all members of society. All patients seeking assistance of prehospital care providers should undergo assessment by emergency medical technicians or paramedics in a timely fashion. Decisions concerning transport to a medical facility should be made on the basis of medical necessity, patient preference, and the capacity of the facility to deal with the medical problem.
  b.  Adequate inhospital and outpatient resources must be available to guard emergency patient interests
Patients requiring hospitalization for further care should not be denied access to an appropriate medical facility on the basis of financial considerations. Transfer to another appropriate accepting medical facility for financial reasons may be effected if a) the patient provides consent and b) there is no undue risk to the patient. Admission or transfer decisions should be made on the basis of a patient's best interest.
It is unethical for an emergency physician to participate in the transfer of an emergency patient to another medical facility unless the medical benefits reasonably expected from the provision of appropriate medical treatment at another medical facility outweigh the risks of the transfer or unless a competent patient, or a legally responsible person acting on the patient's behalf, gives informed consent for the transfer. Emergency physicians should be knowledgeable about applicable federal and state laws regarding the transfer of patients between health care facilities.
Although the care and disposition of the patient are primarily the responsibility of the emergency physician, on-call consultants should share equitably in the care of indigent patients. This may include an on-site evaluation by the consultant if requested by the emergency physician.
For patients who do not require immediate hospitalization but need medical follow-up, adequate outpatient medical resources should be available both to continue proper treatment of the patient's medical condition and to prevent the development of subsequent foreseeable emergencies resulting from the original medical problem.

  c.  Emergency physicians should promote prudent resource stewardship without compromising quality
Emergency physicians have an obligation to ensure that quality care is provided to all patients presenting to the emergency department for treatment. Participation in quality assurance activities and peer review are important for assuring that patterns of inadequate care are detected. Participation in continuing education activities, including the development of scientifically-based practice guidelines, assists the emergency physician in providing quality care.
Health care resources, including new technologies, should be used on the basis of individual patient needs and the appropriateness of the therapy as documented by medical literature. Diagnostic and therapeutic decisions should be made on the basis of potential risks and benefits of alternative treatments versus no treatment. The emergency physician has an obligation to diagnose and treat patients in a cost-effective manner and must be knowledgeable about cost-effective strategies; but the physician should not allow cost containment to impede proper medical treatment of the patient.
The limitation of health care expenditures is a societal decision that should ideally be made in the political arena and not at the bedside for individual patients. Lacking a societal consensus, however, emergency physicians must keep the patient's interest as a primary concern while recognizing that the medically non-beneficial testing or treatment is not morally required. Thus, the emergency physician has dual obligations to allocate resources prudently while honoring the primacy of patient's best medical interests.   d.  The duty to respond to prehospital emergencies and disasters
Because of their unique expertise, emergency physicians have an ethical duty to respond to emergencies in the community and offer assistance. This responsibility is buttressed by local Good Samaritan statutes that protect health care professionals from legal liability for good-faith efforts to render first aid. Physicians should not disrupt paramedical personnel who are under base station medical control and direction.
In a situation where the resources of a health care facility are overwhelmed by epidemic illness, mass casualties, or the victims of a natural or manmade disaster, the prudent emergency physician must make important triage decisions to benefit the greatest number of potential survivors. When the numbers of patients and severity of their injuries overpower existing resources, triage decisions should classify patients according to both their need and their likelihood of survival. The overriding principle should be to focus health care resources on those patients most likely to benefit who have a reasonable probability of survival. Those patients with fatal injuries and those with minor injuries should be made as comfortable as possible while they await further medical assistance and treatment.
  e.  The duty to oppose violence
Serving as a societal resource, emergency physicians have the dual obligation to protect themselves, staff, and patients from violence and to teach EMS personnel under their supervision to do likewise. Hospitals have a duty to provide adequate numbers of trained security personnel to assure a safe environment. Ensuring safety may mean that patients who appear to present a high risk of violence will lose some autonomy as they are restrained physically or chemically. Emergency physicians never should resort to restraints or medication for punitive or vindictive reasons. Restraints are indicated only when there is a reasonable possibility that patients will harm themselves or others. The need for restraint of emergency department patients should frequently be reevaluated.
The emergency physician has an ethical duty to diagnose, treat, and properly refer suspected victims of abuse and neglect, including partners, children and dependent adults, and to report domestic violence to appropriate authorities as permitted or required by law.
  f.  The duty to promote the public health
Emergency physicians advocate for the public health in many ways, including the provision of basic health care for many uninsured patients. As a safety net both for patients who lack other resources of care and for victims of disaster, emergency departments provide needed care and assistance to many of the most vulnerable members of society. In times of disaster, pandemic, or other public health emergencies, emergency departments serve as a vanguard of preparedness against a constellation of medical and social ills.
Emergency physicians have first-hand knowledge of the grave harms caused by firearms, motor vehicles, alcohol, and other causes of preventable illness and injury. Inspired by this knowledge, emergency physicians should participate in efforts to educate others about the potential of well-designed laws, programs, and policies to improve the overall health and safety of the public.
CONCLUSION 
Serving patients effectively requires both scientific and technical competence, knowledge of what can be done, and moral competence, knowledge of what should be done. The technical emphasis of emergency medicine must be accompanied by a corresponding emphasis on character and careful moral reasoning, as emergency physicians increasingly confront difficult moral questions in clinical practice.
In the face of future uncertainties and challenges, ethics will remain central to the clinical practice of quality emergency medicine. Both technical and moral expertise can and should be nurtured through advanced preparation and training. The time and information constrains inherent in emergency practice make reflection on important ethical principles and values challenging. This Code is offered both for thoughtful consideration and as a resource when issues arise in clinical practice. The principles of emergency medical ethics identified herein may serve as a guide for practitioners and students of this developing art. Through the process of moral reflection and deliberation, emergency physicians can make difficult and time-sensitive decisions based on a sound moral framework that benefits both patients and profession.

Key words:
four principles of ethics                                              principles of ethics in healthcare
nonmaleficence                                                           principles of ethics in nursing
moral principles ethics                                                principles of medical ethics
principles of business ethics                                       principles of ethics and code of professional conduct
principles of ethics and code of professional conduct