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* From Sharp Coronado Hospital, San Diego, CA.
A list of Task Force members is given in the Appendix.
Correspondence to: Asha Devereaux, MD, MPH, 1224 Tenth St, #205, Coronado, CA 92118; e-mail: ADevereaux{at}pol.net
Key Words: alternate standards of care critical care critical care assessment teams disaster critical care disaster medicine disaster triage ethics health-care worker and disaster mass casualty mass casualty critical care mass casualty respiratory failure triage triage teams mass critical care psychological impact of disaster
| Executive Summary |
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Mass casualty events occur frequently worldwide.3 Fortunately, the vast majority of these do not generate overwhelming numbers of critically ill victims. Attention to mass critical care, however, has been stimulated by the severe acute respiratory syndrome epidemic of 2002–2003,45 recent natural disasters, concern for intentional catastrophes, and the looming threat of a serious influenza pandemic.167891011 To guide preparedness for such events, the Task Force for Mass Critical Care (hereafter referred to as the Task Force) was convened. It comprised 37 experts from fields including bioethics, critical care, disaster preparedness and response, emergency medical services, emergency medicine, infectious diseases, hospital medicine, law, military medicine, nursing, pharmacy, respiratory care, and local, state, and federal government planning and response. Several members of the Critical Care Collaborative (http://www. chestnet.org/institutes/cci/ccc.php) initiated the project and assembled a steering committee for project development and administration. Members of this steering committee included representatives from the organizational members of the Critical Care Collaborative as well as several unaffiliated North American disaster experts. This steering committee then selected members of the broader Task Force on the basis of their expertise and experience.
| Methods and Structure |
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The full Task Force convened in Chicago, IL, on January 26–27, 2007, to consider all elements of the draft documents. Writing committees were formed to modify the draft documents to reflect the discussions and the most current and relevant medical literature. Only articles written in English were considered. Revised versions of the documents were electronically transmitted to all members of the Task Force iteratively for comment and review. The Task Force writing committees worked on this project from January to December 2007, primarily via telephone conference calls and two face-to-face meetings in June and October 2007. All authors completed disclosure statements, and there were no conflicts of interest. The authors were given complete autonomy by the American College of Chest Physicians and the Critical Care Institute. Because of the revisions and expanding length of the documents, a fourth document was created to serve as an introduction for the following three. The documents are separated as follows:
Document 1: Definitive Care for the Critically Ill During a Disaster: Current Capability and Limitations
This document reviews current mass casualty critical care response capabilities and limitations, and provides the rationale and context for most of the suggestions in the subsequent manuscripts.
Document 2: Definitive Care for the Critically Ill During a Disaster: A Framework for Optimizing Critical Care Surge Capacity
This document provides pre-event guidance for critical care surge preparedness; offers critical care surge capacity goals; defines a framework for modified care, termed emergency mass critical care (EMCC), to increase the number of people who can receive sufficient critical care; and suggests a graded health-care system response to match response need with appropriate response activities.
Document 3: Definitive Care for the Critically Ill During a Disaster: Medical Resources for Surge Capacity
This document provides specific quantities and types of critical care equipment/supplies, staffing, and treatment space for EMCC.
Document 4: Definitive Care for the Critically Ill During a Disaster: A Framework for Allocation of Scarce Resources in Mass Critical Care
This document provides guidance for standardized and fair means to distribute scarce critical care resources. Modern health-care experience caring for hundreds or thousands of critically ill and injured victims from civilian catastrophes is limited.6712 There are few randomized, controlled trials involving the subject matter of this Supplement, so this document is a consensus statement derived from senior-level, experienced, expert opinion rather than an evidence-based guideline. Given the paucity of direct evidence to guide mass casualty critical care practice, all of the suggestions of the Task Force are, at best, extrapolated from rigorous evaluations of everyday ICU care, as well as the related fields of military medicine and critical care transport. Lack of direct evidence does not negate their anticipated beneficial effect for mass casualty critical care situations.13 Consensus of suggestions was achieved by electronic communication with Task Force members. No disagreements were received on any of the final suggestions. The American College of Chest Physicians Health and Science Policy Committee designates that these suggestions should not be used for performance measurement or for competency purposes because they are not evidence-based. Because the term suggestion implies an option to choose among a number of possibilities, the writing committee wishes to emphasize that these suggestions should in fact be considered coordinated proposals to establish a sound foundation for ICU disaster plans.
| Summary of Specific Suggestions |
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Suggestion 2.2: Hospitals with ICUs should plan and prepare to provide EMCC every day of the response for a total critically ill patient census at least triple usual ICU capacity.
Suggestion 2.3: Hospitals should prepare to deliver EMCC for 10 days without sufficient external assistance.
Suggestion 2.4: EMCC should include, when applicable, the following: (1) mechanical ventilation, (2) IV fluid resuscitation, (3) vasopressor administration, (4) antidote or antimicrobial administration for specific diseases, (5) sedation and analgesia, (6) select practices to reduce adverse consequences of critical illness and critical care delivery, and (7) optimal therapeutics and interventions, such as renal replacement therapy and nutrition for patients unable to take food by mouth, if warranted by hospital or regional preference.
Suggestion 2.5: All communities should develop a graded response plan for events across the spectrum from multiple casualty to catastrophic critical care events. These plans should clearly delineate what levels of modification of critical care practices are appropriate for the different surge requirements. Use of EMCC should be restricted to mass critical care events.
Definitive Care for the Critically Ill During a Disaster: Medical Resources for Surge Capacity
Suggestion 3.1:
EMCC requires one mechanical ventilator per patient concurrently receiving sustained ventilatory support.
Suggestion 3.2: Positive pressure ventilation equipment purchased for surge capacity should at a minimum accomplish the following: (1) be able to oxygenate and ventilate most pediatric and adult patients with either significant airflow obstruction or ARDS; (2) be able to function with low-flow oxygen and without high-pressure medical gas; (3) accurately deliver a prescribed minute ventilation when patients are not breathing spontaneously; and (4) have sufficient alarms to alert the operator to apnea, circuit disconnect, low gas source, low battery, and high peak airway pressures.
Suggestion 3.3: To optimize medication availability and safe administration, the Task Force suggests that modified processes of care should be considered prior to an event, such as the following: (1) rules for medication substitutions; (2) rules for safe dose or drug frequency reduction; (3) rules for conversion from parenteral administration to oral/enteral when possible; (4) rules for medication restriction (eg, oseltamavir if in short supply during an influenza pandemic); and (5) guidelines for medication shelf-life extension.
Suggestion 3.4: EMCC should occur in hospitals or similarly designed and equipped structures (eg, mobile medical facility designed for critical care delivery, veterinary hospital, or outpatient surgical procedure center). After ICUs, postanesthesia care units, and emergency departments reach capacity, hospital locations for EMCC should be prioritized in the following order: (1) intermediate care units, step-down units, and large procedure suites; (2) telemetry units; and (3) hospital wards.
Suggestion 3.5: Nonmedical facilities should be repurposed for EMCC only if disasters damage regional hospital infrastructure by making hospitals unusable, and if immediate evacuation to alternate hospitals is not available.
Suggestion 3.6: Principles for staffing models should include the following: (1) patient care assignments for caregivers should be managed by the most experienced clinician available; (2) assignments should be based on staff abilities and experience; (3) delegation of duties that usually lie within the scope of some workers practice to different health-care workers may be necessary and appropriate under surge conditions; and (4) systematic efforts to reduce care variability, procedure complications, and errors of omission must be used when possible.
Definitive Care for the Critically Ill During a Disaster: A Framework for Allocation of Scarce Resources in Mass Critical Care
Suggestion 4.1:
All hospitals must operate uniformly and cooperate in order to successfully implement a triage process when resources are scarce and/or unavailable.
Suggestion 4.2: All attempts should be made by the health-care facility to acquire scarce critical care resources or infrastructure, or to transfer patients to other health-care facilities that have the appropriate ability to provide care (state, national, and even international). Critical care will be rationed only after all efforts at augmentation have been exceeded. The Task Force assumes that EMCC has become exhausted and a Tier 6+ level has been attained or exceeded.
Suggestion 4.3: The Task Force offers a uniform approach to triaging patients during allocation of scarce resources based on objective and quantitative criteria with the following underlying principles as a foundation for this process:
Suggestion 4.3A: Critical care will be rationed only after all efforts at augmentation have been exceeded.
Suggestion 4.3B: Limitations on critical care will be proportional to the actual shortfall in resources.
Suggestion 4.3C: Rationing of critical care will occur uniformly, be transparent, and abide by objective medical criteria.
Suggestion 4.3D: Rationing should apply equally to withholding and withdrawing life-sustaining treatments based on the principle that withholding and withdrawing care are ethically equivalent.
Suggestion 4.3E: Patients not eligible for critical care will continue to receive supportive medical or palliative care.
Suggestion 4.4: The Task Force suggests that a triage officer and support team implement and coordinate the distribution of scarce resources.
Suggestion 4.5: The Task Force suggests a systematic, retrospective review of the decisions of the triage team by a review committee.
Suggestion 4.6: Palliative care is a required component of mass critical care.
Suggestion 4.7: The Task Force believes a strong commitment to the ethical considerations outlined in the article is necessary in implementation of the triage process and allocation of scarce resources.
Suggestion 4.8: Providers should be legally protected for providing care during the allocation of scarce resources in mass critical care when following accepted protocols.
| Conclusion |
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Unfortunately, in some circumstances EMCC will not be sufficient to allow critical care to be provided to all those who are critically ill. In such cases, it is necessary to target the resources available to those who are most likely to benefit in order to maximize overall survival. This is accomplished through triage, a complex process balancing available resources with the demands on those resources at a population level rather than at the individual patient level, where health-care workers typically focus. In short, the goal is to do the greatest good for the greatest number. In some situations, optimal triage will have enormous impact on overall mortality. Obviously, such decisions are very complex, fraught with ethical dilemmas that require thoughtful consideration well in advance of their use in an emergency. Failure to perform optimal triage carries with it significant consequences because either overtriage or undertriage will likely increase mortality for the entire critically ill and injured population.
Although intended to save lives and optimize system performance during times of crises, the decision to employ either EMCC or critical care triage should never be taken lightly or in isolation. Both EMCC and critical care triage represent a deviation from providing usual, current state-of-the-art critical care and depriving some individuals the optimum treatment for the good of the collective society. Thus, such actions are justifiable only in very specific circumstances and must occur within a response framework as outlined in Figures 1, 2 . These figures illustrate how the various concepts in this Supplement are integrated within a comprehensive response framework. Hospitals should ensure that their critical care staff understand and are able to use the tools of EMCC and triage within an integrated response should they ever be called on to respond to an overwhelming number of critically ill or injured victims. This Supplement therefore serves as a necessary beginning in this planning process. It is expected that as hospitals practice, drill, and achieve surge capacity, these suggestions will require modification.
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| Appendix |
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| Acknowledgements |
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| Footnotes |
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The author has no conflict of interest to disclose.
Received for publication March 10, 2008. Accepted for publication March 10, 2008.
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