SUMMARY OF CHANGES
INTRODUCTION
This Role 1 (including Point of Injury [POI]) through Role 4 Clinical Practice Guideline (CPG) is intended for use in conjunction with Tactical Combat Casualty Care (TCCC) Guidelines. This CPG is meant to provide medical professionals who encounter CBRN exposures with evidence-based guidance where it exists or consensus opinion when evidence is lacking. Additional information and resources for decontamination, medical management, and overall management during a CBRN exposure are available at https://chemm.hhs.gov. JTS CBRN CPGs include four separate parts:
While encountering conventional casualties on the battlefield is more likely, it is important to remain vigilant in identifying any unusual scenarios that may indicate a CBRN incident occurred. Initial suspicion of a CBRN attack will often rest solely on clinical signs and symptoms when environmental sampling and rapid point-of-care testing for agent identification is unavailable. Figure 1 provides a breakdown of different toxidromes and syndromes for an ease of use and an integrated approach. Note that some chemical agents traditionally considered chemical warfare agents are being moved to the Inhalational Injury and Toxic Industrial Chemicals (TICs) CPG as they are more likely to be encountered via other occupational exposures.
This CPG Part I guideline is intended to provide an approach to casualty assessment and treatment from POI to established medical facilities.
Note: Edits to the CBRN CPG 2 and TICS CPG are currently in update to reflect the above figure of toxidromes and syndromes.
Initial care of the CBRN casualty should be approached in the same manner as other casualties. However, there are additional layers of personal protection, decontamination and medical countermeasures that need to be applied. Life threatening conditions require prompt recognition and intervention, while non-life-threatening sequelae can be addressed when clinically appropriate. Early recognition and categorization of CBRN-exposed patients is key for initiating patient treatment and preventing contamination of medical personnel, equipment, and facilities. Thorough and appropriate decontamination is a core skill that requires planning and practice. Attention to detail such as preventing hypothermia and clinical reassessment at each stage of the process will reduce unnecessary morbidity. Hypothermia is highly likely to occur in patients not only due to the decontamination processes but also due to agent exposure itself. Furthermore, easy access to reference materials to guide advanced therapy should be a part of every provider’s armamentarium. These basic principles will be discussed in more detail in the following sections. Understanding the difference between exposure and contamination is critical. Contamination occurs when a material/agent is somewhere undesirable. If intact Personal Protective Equipment (PPE) is contaminated and the contaminated PPE is safely removed there is no longer contamination, i.e., the patient has been decontaminated. If contamination is present on the skin and the skin is properly decontaminated the patient is clean and poses no threat to caregivers.
The critical task list applies to medical and non-medical personnel and addresses core competencies that can be adjusted based on the medical skill level of the responder. All personnel should be trained on the concepts and principles identified in the critical task list to respond to CBRN casualties. These tasks should be taught according to service-specific publications and recognized standards of medical care and are outlined below.
The response to CBRN exposure requires extensive planning based on the threat. In a high-threat environment, immediate availability of adequate PPE is essential. Personnel should also be aware of field expedient PPE options (Table 2).
The en-route care approach to the combined CBRN/trauma casualty should not differ from POI through MEDEVAC. The (MARCHE)2 mnemonic provides a helpful methodology for assessing and applying critical interventions during transport. The medical provider should perform regular reassessments, recheck all (MARCHE)2 interventions, and intercede where necessary. Challenges of the physical exam during transport are amplified in the CBRN environment when the medical provider and crew are wearing PPE. Training while in Mission Oriented Protective Posture (MOPP) IV and practicing patient care maneuvers that may be hindered by this protective posture is paramount to successful care of the CBRN casualty. Incorporating evacuation planning considerations into training exercises will allow optimal casualty management and provider safety.
Military Treatment Facility (MTF)
LANDING ZONE/CASUALTY EXCHANGE POINTS
Each scenario will be unique based on the mission, location, available assets, etc. General considerations include:
Clean and Dirty: It is necessary to plan for both clean and dirty platforms for evacuation.
Class VIII (medical supplies) and critical care support equipment:
An extensive discussion of decontamination is outside the scope of this CPG; however, recognize decontamination is considered a critical medical treatment for the casualty and limits exposure risk to medical providers. Basic decontamination principles are outlined below:
1. Medical personnel apply appropriate PPE before treating others
2. Remove all clothing and equipment from the casualty (removal of clothing can eliminate 90-95% of contamination). Contain and dispose of contaminated material appropriately.
3. If radiologic exposure, cover wounds before further decontamination. Ensure gentle decontamination as radionuclide absorption may be increased if the skin barrier becomes erythematous or broken.
a. For additional details reference CBRN CPG 3
4. Decontamination solutions
a. Soap and water
b. 5% hypochlorite solution
c. Reactive Skin Decontamination Lotion (RSDL)
d. Surgical irrigation solutions for open chest and abdominal cavity wounds
e. Water, normal saline, or eye solutions are recommended for flushing the eye
f. Decontamination of hair following chemical exposure should not be forgotten. Consideration should be given to cutting (not shaving due to potential spread of contamination) longer hair vs spending time to decontaminate. Level of contamination will determine effectiveness of the decontaminant used.
g. Additional detail on decontamination by chemical agent is discussed in CBRN Injury Response Part 2
5. Due to potential time delays in presentation after exposure, casualties presenting with syndromes due to infectious agents may not require decontamination. Note that the casualties may be infectious, and warrant the use of empiric transmission-based precautions.
a. However, if there was an incident with a weaponized biothreat delivered via aerosol or powder, decontamination is warranted.
b. Removing clothing and washing exposed skin and hair with soap and water, followed by drying the skin and hair is generally considered adequate decontamination for most biothreats.
c. Additional detail on decontamination of biological casualties is discussed in CBRN Injury Response Part 4.
6. Internal decontamination for radiologic agents will be discussed in detail in the medical management of radiologic exposure and nuclear events (CBRN Injury Response Part 3).
Although agent identification may help to drive the treatment course, it is not required prior to providing casualty care in a CBRN environment. Casualty treatment should never be delayed pending confirmatory agent identification. Clinical assessment (using CRESS described below and in Table 3) is necessary to determine immediate therapy. Decisive efforts for agent identification can be done in parallel with timely medical treatment. It should be recognized that intelligence reporting may be incomplete or inadequate. There are a variety of detectors that can aid in agent identification and providers should be familiar with the technology that is part of their organization.
Combine available intelligence, technology, and patient presentation to create a comprehensive picture for agent identification to help guide treatment. Mixed exposures are possible and correlating patient signs and symptoms with adjunctive agent identification techniques can help ensure the proper treatment is pursued.
**Casualty treatment should never be delayed pending confirmatory agent identification. Clinical assessment (using CRESS described below) is necessary to determine immediate therapy. Decisive efforts for agent identification can be done in parallel to timely medical treatment.**
Because of the differences in presentation for CBRN casualties, specific triage recommendations and evacuation priority considerations will be addressed in the portion of the CPG that is specific to the different categories of CBRN exposures.
As in all tactical situations, security and fire superiority are the first priorities. Triage for a CBRN event follows established triage principles, including doing the most good for the most people. Because of the complexity of combined CBRN and trauma casualties, it may be beneficial to assign an experienced provider to triage. Continuous triage should occur during decontamination, medical treatment, and the evacuation phases of care. True triage for decontamination involves a determination of who can tolerate delays in decontamination. Decontamination order should be based on extent of exposure because the patient must be able to survive the decontamination process with limited medical interventions, keeping in mind initial symptoms may be delayed based on the agent. All patients will benefit from rapid decontamination as this decreases duration of exposure, and reduces the future burden on medical resources. Once decontaminated, patients are triaged according to medical priority. Decontamination is a medical intervention and any casualty with an area suspicious of having been exposed to a liquid chemical agent is automatically medically triaged as immediate until immediate (focused) decontamination has been accomplished. The casualty is then re-triaged. Except for vesicant casualties, those exposed only to vapor can tolerate delays in decontamination or may not even require thorough decontamination. It is important to frequently reassess patients because many CBRN agents cause delayed symptoms, a casualty initially determined to be minimal may become immediate.10 Remember that the process of decontamination can significantly change the casualty status. It is critically important to monitor for hypothermia, disruption of previously controlled bleeding, and other changes in patient status that would change triage priority.
Assessment and management of CBRN casualties is complex because it involves not only life-threatening symptoms but also the threat of contamination of all first responders. An added source of complexity is the frequent mixing of CBRN and penetrating trauma injuries (Figure 3). Working through this complexity involves a stepwise approach that first rules in or rules out CBRN injuries so that first responders can protect themselves if necessary before rendering aid. The next step integrates assessment and management of both CBRN and traumatic injuries, prioritizing the recognition and management of life-threats first.
CRESS: A SIMPLIFIED APPROACH TO CBRN CASUALTY ASSESSMENT
Just as trauma casualties present differently (blunt trauma, GSW, blasts, etc.), CBRN casualties also have varied presentations. For example, chlorine casualties will require more attention to the toxic inhalation symptoms contrasted with a mustard casualty whose associated trauma may initially require more prompt intervention than the mustard-specific effects. CBRN casualties can be categorized by circumstances of exposure and presence or absence of trauma and CBRN effects.
In a CBRN-threat environment, casualties may have traumatic, CBRN, or mixed injuries. Before applying TCCC, it is important to identify whether CBRN injuries are present to allow first responders to protect themselves before treating the patient. While this often can be deduced using intelligence reports, technologic agent identification resources, and circumstances of the CBRN event, there will be times when agent identification will need to be made solely based on clinical assessment of symptoms. Clinical clues can be aggregated to identify the most likely agent responsible for symptoms according to the CRESS assessment. Infectious agent exposure, for example, is unlikely to cause early symptoms (see CBRN CPG Part 4), while toxins, chemical and high dose radiologic exposures may lead to symptoms in minutes to hours (see CBRN CPGs Part 2-4). A CRESS assessment can be used to assess which chemical toxidrome exposure may be linked to. Each letter in CRESS corresponds to physical exam findings that can be used to categorize the suspected chemical based on the constellation of findings (Table 3). A depiction of time to onset of signs/symptoms as well as common chemical toxidromes and biological and radiological syndromes can be found in Figure 4.
C - Consciousness (agitated, depressed, unconscious)
R - Respirations (normal, increased, or decreased)
E- Eyes (constricted/pinpoint, dilated, normal)
S - Secretions (dry, normal, increased)
S - Skin (diaphoretic, dry, hot, cyanotic)
Source: US Department of Health and Human Services. Types and Categories of Hazardous Chemicals and Related Toxidromes.
Source: Calder A, Bland S. CBRN considerations in a major incident. Surgery. Volume 36, Issue 8. Pages 417-423. 201
Antidote Treatment - Nerve Agent, Auto-Injector (ATNAA) [2.1 mg atropine and 600mg pralidoxime (2-PAM)]; Convulsant Antidote for Nerve Agent (CANA) [10mg diazepam]; Advanced Anticonvulsant System (AAS) [10mg midazolam]; Rapid Opioid Countermeasure System (ROCs) [10mg naloxone]
1May be variable due to agent characteristics, exposure dose, individual response variability, PPE worn at time of exposure, and whether antidotes administered.
2May be variable due to agent characteristics, exposure dose, individual response variability, PPE worn at time of exposure, and whether anticholinergics administered.
3ROCS (naloxone) does not have any significant drug interactions with the drugs contained in ATNAA, CANA or AAS.
4Depending on the agent and dose there may be convulsions.
5If wearing PPE may be diaphoretic.
6Reference ATP 4-02.85/MCRP 4-11.1A/NTRP 4-02.22/AFTTP(I) 3-2.69 for nuances of self-aid, buddy aid, combat lifesaver care, or treatment by the combat medic/corpsman/Air Force medic.
(MARCHE)2: INTEGRATING TCCC MARCH WITH CBRN FIRST RESPONSE
After initial assessment of casualties for the presence or absence of CBRN symptoms using the CRESS algorithm (and donning of PPE by first responders), the integrated assessment and management of TCCC and CBRN injuries can proceed.
The acronym (MARCHE)2 integrates the established TCCC MARCH algorithm (Massive Hemorrhage, Airway, Respirations, Circulation, Hypothermia) with CBRN MARCHE priorities (Mask, Antidotes, Rapid spot decontamination, Countermeasures, Extraction and Evacuation). Combining these two approaches gives the acronym (MARCHE)2 or “MARCH-squared.”
Similar to TCCC, (MARCHE)2 can be broken into phases of care from highest threat (care under fire or active CBRN threat), to intermediate threat (tactical field care or warm zone casualty management), to lowest threat (Prolonged Field Care (PFC)/evacuation or cold zone care of decontaminated casualties) (Figure 6 below).
PUTTING IT ALL TOGETHER: CRESS AND (MARCHE)2
Step 1: Hot Zone / Care Under Fire
The hot zone is an area where there is an immediate and ongoing threat to casualties and responders. During “hot zone” care, the agent itself is similar to enemy fire. As such, the priorities are protection and egress away from the threat (CBRN agent) for both casualty and provider. Both the casualty and provider should don protective masks. If the casualty is incapacitated, the provider must ensure the casualty’s protective gear is applied and functional.
Only rapid interventions for immediate life-threats should be addressed. This typically includes management of catastrophic hemorrhage, airway problems, and antidote administration before evacuating out of the hot zone for decontamination and further treatment. Massive hemorrhage, if present, is the most immediate life threat and control of hemorrhage supersedes other interventions. Massive hemorrhage, if compressible, should be treated according to TCCC guidelines with limb or junctional tourniquets, as applicable.
Perform a rapid assessment of the airway and respirations. Excessive secretions and increased respirations may indicate nerve agent exposure. Completion of the CRESS assessment will help determine if the symptoms are due to trauma or chemical agent exposure. Most airway and respiratory interventions should be deferred, though there are some interventions that may take priority over mask application. The decision to unmask a casualty to provide these interventions needs to be weighed against the risk of the contaminated environment.
Some CBRN agents are rapid killers. The CRESS assessment will quickly determine whether immediate antidotes are required. If exposure to a rapidly killing agent (i.e. nerve agent, cyanide, opioid incapacitating agent) is suspected, administer the appropriate antidotes (ATNAA/AAS, hydroxocobalamin, naloxone). Cyanide treatment can be considered in the hot zone, but the need to establish IV/IO access to administer hydroxocobalamin makes this a judgment call weighed against the time needed to reach the warm zone and the ongoing threat in the hot zone location. If nerve agent exposure is suspected (decreased level of consciousness, increased respirations, constricted pupils, increased secretions, diaphoretic skin), then the provider should direct self-administration of Antidote Treatment Nerve Agent Auto-injector (ATNAA) and Convulsant Antidote for Nerve Agent (CANA) or administer the antidotes for an incapacitated casualty.
Rapid spot decontamination of skin or wounds is indicated when there is gross contamination on the skin or wounds or when protective gear is breached. If wound contamination with a chemical agent is suspected, immediately expose the wound to perform rapid spot decontamination even in a contaminated environment. This step is necessary even in a contaminated environment and may be lifesaving.
As in TCCC, non-essential interventions should be deferred until the next phase of care.
Step 2: Warm Zone / Tactical Field Care
In the warm zone, or tactical field care phase, attention is given to decontamination and reassessment of the casualty. This phase occurs at a dirty CCP (hotline) and requires personnel dedicated to triage, decontamination, and patient treatment. At this phase, interventions may have altered the clinical presentation of the casualty, so it is important to take into account prior interventions and changes in the clinical status of the casualty and administer life-saving treatments.
Note: Casualty Flow moves from top to bottom in this diagram. Triage flows immediate to delayed from left to right in the hot zone diagram. Medical personnel, at least one provider designated clean and one provider designated dirty
Decontamination and treatment should be a synchronous process. Medical personnel need to clearly communicate with non-medical personnel responsible for decontamination. “Expose to treat” is used by decontamination personnel when the provider deems it in the best interest of the casualty to remove PPE to provide life-saving medical intervention. For example, the mask may be removed and the head, face, and chest quickly decontaminated for the provider to ventilate the casualty and insert a sternal IO if parenteral antidotes, blood product, or fluid resuscitation are immediately indicated. It may also be appropriate to prioritize decontamination of an extremity to establish an IV or IO access, should a sternal IO not be an option.
Circulation should be assessed to identify external hemorrhage and shock. Per TCCC guidelines, fluid resuscitation is only indicated for altered mental status in the absence of brain injury and/or a weak or absent radial pulse. The provider can also assess the effects of both CBRN agents and antidotes on the patient’s circulatory status. As decontamination ensues, dirty treatments are replaced with clean. Due to cold water and the need to fully expose the casualty in order to conduct thorough decontamination, hypothermia is a significant risk. Added to the hypothermia risk is the fact that exposure to many of the chemical warfare agents will themselves cause hypothermia of the casualty. Ensure rapid transit through the decontamination line with careful attention to hypothermia mitigation to prevent iatrogenic injury from the decontamination process due to exposure. Additionally, it is important to recognize that personnel working within the warm zone in full protective gear are at risk of heat injury and stressors associated with operating in PPE.
Step 3: Cold Zone / Tactical Evacuation Care / Prolonged Field Care
Once the decontaminated casualty has passed into the cold zone, they should be re-evaluated and receive needed interventions including tactical evacuation or prolonged field care. The decontamination process can result in significant change in the casualty’s condition, so re-triage and reassessment are the first priority. A secondary survey should be done immediately after re-assessment of the primary survey. Documentation throughout the phases of care is vital to facilitate information transfer as the patient transitions from one phase to another. The CBRN casualty card (Appendix C) is a useful tool to ensure comprehensive documentation relevant to the CBRN casualty. In the absence of a CBRN casualty card, the TCCC casualty card is sufficient if duration of care before transfer is short. If handoff of care is delayed, PFC documentation will likely be necessary.9
It is important to consider that receiving providers at all roles of care may have limited experience with CBRN patients. Communication is crucial to ensure receiving providers understand previous decontamination, care, and exposures that may be suspected as to prevent unnecessary repetitive decontamination or redundant treatments.
Casualties that reach the cold zone have been decontaminated and are now suitable for the full spectrum of care appropriate to the clinical environment and capabilities. There are, however, some unique concerns to address in a combination CBRN/trauma casualty. Consider the casualty may have retained foreign material or contaminated dressings in wounds. Such material may pose a risk to treating personnel from off-gassing or secondary contamination. Additionally, this residual contamination may represent a source of exposure to the patient via a route that bypasses the normal skin barriers resulting in rapid systemic distribution of the agent. Larger fragments should be removed from the wound using a “no touch” technique with surgical instruments and placed in a sealed container with hypochlorite solution, minimizing the risk to providers. The contaminated wound should be further irrigated with clean water. Providers dealing with contaminated foreign material or dressings can wear 3 pairs of nitrile gloves. The outer gloves should be discarded every 20 minutes. In the absence of suspected retained debris, the fully decontaminated patient in the cold zone can be treated as all other patients at that level of care.
All patients with Chemical, Biological, Radiological and/or Nuclear (CBRN) exposure/injury
Performance / Adherence Metrics
The above constitutes the minimum criteria for PI monitoring of this CPG. System reporting will be performed annually; additional PI monitoring and system reporting may be performed as needed.
The system review and data analysis will be performed by the Joint Trauma System (JTS) Chief and the JTS PI team.
It is the trauma team leader’s responsibility to ensure familiarity, appropriate compliance, and PI monitoring at the local level with this CPG.
Disclaimer: This document should not be taken as doctrinal and should not supersede any command directed, or SOP directed medical materiel planning documents. Each of the Services have CBRN medical assemblages. Direct all questions regarding Class VIII and assemblage contents to appropriate unit supply personnel.
This is an example medical materiel list for the Joint Trauma System CPG “Chemical, Biological, Radiological, and Nuclear (CBRN) Injury — Part I: Initial Response” (CPG ID: 69). This list reflects a focus on chemical casualties. For biologic and radiation/nuclear lists see CBRN CPGs 3 and 4.
There is additional information contained in the Field Management of Chemical and Biological Casualties Handbook: https://medcoe.army.mil/borden-field-mgt-of-cb-casualities.
For additional information including National Stock Number (NSN), please contact dha.ncr.med-log.list.lpr-cps@health.mil
Illustration by Raymond Samonte
Theater Patient Movement Requirements Center (TPMRC) to coordinate evacuation:
The purpose of this Appendix is to ensure an understanding of DoD policy and practice regarding inclusion in CPGs of “off-label” uses of U.S. Food and Drug Administration (FDA)–approved products. This applies to off-label uses with patients who are armed forces members.
Unapproved (i.e. “off-label”) uses of FDA-approved products are extremely common in American medicine and are usually not subject to any special regulations. However, under Federal law, in some circumstances, unapproved uses of approved drugs are subject to FDA regulations governing “investigational new drugs.” These circumstances include such uses as part of clinical trials, and in the military context, command required, unapproved uses. Some command requested unapproved uses may also be subject to special regulations.
ADDITIONAL INFORMATION REGARDING OFF-LABEL USES IN CPGS
The inclusion in CPGs of off-label uses is not a clinical trial, nor is it a command request or requirement. Further, it does not imply that the Military Health System requires that use by DoD health care practitioners or considers it to be the “standard of care.” Rather, the inclusion in CPGs of off-label uses is to inform the clinical judgment of the responsible health care practitioner by providing information regarding potential risks and benefits of treatment alternatives. The decision is for the clinical judgment of the responsible health care practitioner within the practitioner-patient relationship.
Consistent with this purpose, CPG discussions of off-label uses specifically state that they are uses not approved by the FDA. Further, such discussions are balanced in the presentation of appropriate clinical study data, including any such data that suggest caution in the use of the product and specifically including any FDA-issued warnings.
With respect to such off-label uses, DoD procedure is to maintain a regular system of quality assurance monitoring of outcomes and known potential adverse events. For this reason, the importance of accurate clinical records is underscored.
Good clinical practice includes the provision of appropriate information to patients. Each CPG discussing an unusual off-label use will address the issue of information to patients. When practicable, consideration will be given to including in an appendix an appropriate information sheet for distribution to patients, whether before or after use of the product. Information to patients should address in plain language: a) that the use is not approved by the FDA; b) the reasons why a DoD health care practitioner would decide to use the product for this purpose; and c) the potential risks associated with such use.