NIOSH Fire Fighter Fatality Investigation & Prevention Program - January 28, 2008

Fire Fighter Suffers a Heart Attack and Dies After Completing Work Capacity Test - Idaho


On April 28, 2007, a 66-year-old male volunteer Fire Fighter (FF) participated in a "Pack Test;" one of three work capacity tests designed to simulate the physical demands of wildland firefighting. The Pack Test requires an individual to complete a 3-mile walk within 45 minutes, while wearing a 45-pound vest. Successful completion allows fire fighters to participate in federal wildland firefighting operations. The FF began his Pack Test at approximately 1000 hours, and successfully completed the test at 1045 hours.

About 3½ hours later, the FF telephoned a neighbor asking for a ride to the hospital because he was having chest pains. In the hospital's emergency department, an electrocardiogram and cardiac enzymes confirmed a heart attack. As emergency angioplasty and stent placement of his left anterior descending coronary artery was started, the FF had an arrhythmia and cardiac arrest. Resuscitation was not successful. The death certificate (completed by the coroner) listed "cardiac arrest with electromechanical dissociation" due to "acute anterior wall myocardial infarction" due to "coronary artery disease" (CAD) as the cause of death. No autopsy was performed. The NIOSH investigator concluded that the physical stress of performing the Pack Test about 4 hours earlier probably triggered the FF's fatal heart attack.

The NIOSH investigator offers the following recommendations to possibly prevent a similar recurrence and to address general safety and health issues.


On April 28, 2007, a 66-year-old male volunteer FF died about 4 hours after completing a Pack Test for certification for federal wildland fire fighting. NIOSH was notified of this fatality on May 3, 2007 by the United States Fire Administration. NIOSH contacted the affected Fire Department on May 10, 2007 to obtain further information, and on October 19, 2007 to initiate the investigation. On November 5, 2007, a Safety and Occupational Health Specialist from the NIOSH Fire Fighter Fatality Investigation Team traveled to Idaho to conduct an on-site investigation of the incident.

During the investigation, NIOSH personnel interviewed the following people:

• Fire Chief
• Crew members
• FF's family

NIOSH personnel reviewed the following documents:

• Fire Department annual 2006 response report
• Fire Department standard operating guidelines
Physical Activity Readiness-Questionnaire (PAR-Q) (
• Death certificate
• Hospital records
• Primary care provider medical records


On April 28, 2007, the FF was scheduled to perform the Pack Test administered by a member of a neighboring fire department, using guidance from the Idaho Department of Lands. He arrived at the designated test location (a paved roadway) at approximately 0930 hours, and parked about ¼‑mile from the site. There was one test administrator, and 11 other fire fighters were taking the test. The test administrator reviewed testing procedures, including some "questions and answers" regarding the PAR-Q. The length of the road course equaled 3 miles. There was no emergency medical technician (EMT) or paramedic on-site, but water and other replacement fluids were available.

The Pack Test is the most arduous version of the Work Capacity Test and involves walking a distance of 3 miles within 45 minutes, while wearing a 45-pound vest. The FF was given a weighted vest, and the group of participants gathered together and was briefed on the testing and safety procedures. Each participant completed the PAR-Q. The FF completed the PAR-Q, answering "yes" to three of the health screening questions: (1) did he have a known heart condition and should only do physical activity recommended by a doctor, (2) does he lose his balance because of dizziness or ever lose consciousness, and (3) is his doctor currently prescribing drugs for his blood pressure or heart condition. The test administrator reviewed the form before the test and questioned the FF about his participating in the "Pack Test" and offered the FF the opportunity to perform the "Field Test" (walk 2 miles within 30 minutes while wearing a 25- pound vest). However, the FF wished to participate in the more arduous "Pack Test." He planned to perform service as a wildland contract fire fighter. It is unclear if the test administrator had any medical experience or had any guidance on when to preclude test participation based on answers to the PAR-Q. The FF had passed a medical evaluation 2 weeks prior for a commercial driver's license, but did not have specific clearance to perform the Pack Test. The temperature outside was approximately 65° Fahrenheit [NOAA 2007].

The group began the test at about 1000 hours, and the FF completed the course within the allotted time. Toward the end of the walk, he commented to a crew member that he was feeling light-headed. He stumbled, fell, got up, and continued walking, laughing about the incident. He did not complain of any chest pains or other symptoms of heart-related problems. After the test was concluded, the fire fighters drank water and departed the scene around 1100 hours. The FF drove home without incident, although a crew member followed him to ensure that he was alright.

At about 1530 hours, the FF telephoned a neighbor, saying he was having chest pains and needed a ride to the hospital. After driving about 50 miles, they reached the hospital's emergency department at 1642 hours. Inside the Emergency Department, it was determined through electrocardiogram (EKG) and cardiac enzyme testing that the FF was having a heart attack. The FF related to the physician that the chest pain began as a "dull ache" in his substernal area at about 1000 hours when he was doing a physical test to be a fire fighter, and that he discontinued the test, but the symptoms continued. He did not share this information with the Pack Test administrator earlier in the day, nor did he discontinue the test.

He was taken to the cardiac catheterization lab at 1701 hours where an occluded left anterior descending coronary artery was found. As percutaneous coronary intervention (e.g., angioplasty with stent placement) was started, the FF's heart rhythm degraded to electromechanical dissociation with no pulse. Cardiopulmonary resuscitation and advanced life support treatment were begun, continuing for about 45 minutes without positive results. Resuscitation efforts ended at 1803 hours, and the FF was pronounced dead.

Medical Findings.   The death certificate (completed by the coroner) listed "cardiac arrest with electromechanical dissociation" due to "acute anterior wall myocardial infarction" due to "coronary artery disease" (CAD) as the cause of death. No autopsy was performed.

The FF was 71 inches tall and weighed 223 pounds, giving him a body mass index (BMI) of 31.1. A BMI >30.0 kilograms per meters squared (kg/m2) is considered obese [National Heart, Lung, and Blood Institute 2005]. He was diagnosed with hypertension in 1989 but refused treatment until 1996. Over the next 10 years, a variety of anti-hypertensive prescription medications were tried, but the FF's blood pressure remained poorly controlled. He was also diagnosed with hyperlipidemia (both cholesterol and triglycerides) in 1989 but was never prescribed any medications, and diet was not successful in reducing either his cholesterol or triglycerides. In April 2005, the FF was diagnosed with angina and coronary artery disease (CAD). He underwent successful angioplasty and stenting of his proximal left anterior descending coronary artery. While being maintained on anti-coagulants (Plavix and aspirin), the FF suffered a hemorrhagic stroke six days after angioplasty. Over the ensuing 2 months, his residual left-sided hemiparesis resolved. The FF passed a medical evaluation for a commercial driver's license 2 weeks prior to his death. At that time, he had discontinued all his medications except for 1 low dose aspirin two times per week.


At the time of the NIOSH investigation, this Fire Department consisted of 20 uniformed personnel, served a population of 200 in a 229-square-mile area, and had 1 fire station. The average age of members is 60 years old. In 2006, the Fire Department responded to 6 emergency calls including: 4 grass fires (including one that burned 27,000 acres) and 2 car fires. The Fire Department also assisted at several control burns.

Membership and Training. The Fire Department requires the following of all fire fighter applicants:

• complete an application
• possess a valid State driver's license
• be over 18 years of age

The applicant is voted on by the general membership. The successful applicant is accepted into the Fire Department and receives training in-house twice monthly. Additional training for wildland firefighting occurs in the winter and spring and is conducted by a State-certified instructor. There is no State requirement for fire fighter certification.

The FF was certified as a Driver/Operator and a Wildland Fire Fighter. He had 3 years of firefighting experience with this Fire Department, and had retired from the United States Forest Service with 25 years of experience as a Forester and 20 years as a wildland fire fighter, including 12 years on a Type I Team.

Pre-placement and Periodic Medical Evaluations. No pre-placement or periodic medical evaluations are required by this Fire Department. Medical clearance for SCBA use also is not required. If someone is injured at work, a return-to-duty medical clearance is not required.

Health/Wellness. An annual physical agility test is not required for members. There is no wellness/fitness program, and aerobic and strength training equipment are not available.


Coronary Artery Disease (CAD) and the Pathophysiology of Sudden Cardiac Death. In the United States, CAD (atherosclerosis) is the most common risk factor for cardiac arrest and sudden cardiac death [Meyerburg and Castellanos 2005]. Risk factors for its development include increasing age, male gender, heredity, tobacco smoking, diabetes, high blood cholesterol, high blood pressure, and physical inactivity/obesity [AHA 1998; Jackson et al. 2001]. The FF had five risk factors for CAD: increasing age, male gender, high blood cholesterol, high blood pressure, and obesity. Two years prior to his death he was found to have angina and CAD for which he underwent angioplasty and stenting.

The narrowing of the coronary arteries by atherosclerotic plaques occurs over many years, typically decades [Libby 2005]. However, the growth of these plaques probably occurs in a nonlinear, often abrupt fashion [Shah 1997]. Patients with severe CAD are at risk for heart attacks. Heart attacks occur with the sudden development of complete blockage (occlusion) in one or more coronary arteries that have not developed a collateral blood supply [Fuster et al. 1992]. This sudden blockage is primarily due to blood clots (thromboses) forming on top of atherosclerotic plaques. On cardiac catheterization, the FF had an occluded left anterior descending coronary artery, and had an abnormal EKG and elevated cardiac enzymes; each finding by itself confirming a heart attack.

Blood clots in coronary arteries are initiated by disruption of atherosclerotic plaques. Certain characteristics of the plaques (size,  composition of the cap and core, and presence of a local inflammatory process) predispose the plaque to disruption [Fuster et al. 1992]. Disruption then occurs from biomechanical and hemodynamic forces, such as increased blood pressure, increased heart rate, increased catecholamines, and shear forces, which occur during heavy exercise [Kondo and Muller 1995].

Epidemiologic studies have found that heavy physical exertion sometimes immediately precedes and triggers the onset of acute heart attacks [Willich et al. 1993; Mittleman et al. 1993; Siscovick et al. 1984; Tofler et al. 1992]. The FF had completed the Pack Test within the allotted time and walked an additional ½-mile to and from his vehicle. This activity expended about 7-8 METs, which is considered moderate to heavy physical activity [American Industrial Hygiene Association Journal 1971; Ainsworth 2003; Ainsworth et al. 1993]. Heart attacks in fire fighters have been associated with alarm response, fire suppression, and heavy exertion during training (including physical fitness training) [Kales et al. 2003, Kales et al. 2007, NIOSH 2007]. Given the FF's underlying CAD, the physical stress of performing the Pack Test probably triggered a heart attack and his sudden cardiac death.

Occupational Medical Standards for Wildland Fire Fighters.   National Fire Equipment System (NFES) Standard 1596, Fitness and Work Capacity, provides information on fitness, work capacity, nutrition, hydration, the environment, work hardening, and injury prevention for wildland fire fighters [NWCG 1997]. It requires medical clearance for return to work, but not for pre-placement, periodic, or pre-Work Capacity Test. Prior to engaging in moderate physical activity (e.g., wildland fire fighting or the Pack Test) the standard recommends participants complete a health screening questionnaire, known as the PAR-Q. If the participant answers yes to one or more of the seven questions, the form recommends discussing activity restrictions with the participant's doctor. NFES 1596 includes American College of Sports Medicine (ACSM) recommendations to perform a medical examination for persons who are over the age of 40, have heart disease risk factors (smoking, high blood pressure, elevated cholesterol), or are sedentary individuals planning a major increase in activity [NWCG 1997]. The FF had all three of these ACSM triggers for a medical evaluation, and checked three items on the PAR-Q. It is unclear if this FF had discussed the risks/benefits of taking the Pack Test with his doctor. The Pack Test Administrator did not question the FF's participation, and did not require a signed letter of participation by the FF's physician.

NFES 1109, Work Capacity Test Administrator's Guide, addresses requirements and recommendations for performing the WCT Pack Test. It does not require a pre-WCT medical examination for all applicants [NWCG 2003]. It does require a completed health screening questionnaire (or medical history) and a medical exam (if indicated). When a medical examination is required, no blood testing for lipid and glucose levels is performed, nor are exercise stress tests considered. NFES does not require the Pack Test participant to provide a medical clearance to the test administrator prior to the Pack Test.

NFPA 1051, Standard for Wildland Fire Fighter Professional Qualifications, addresses medical and job-related physical performance requirements for entry-level wildland fire fighters. It recommends that the jurisdictional authority determine those requirements [NFPA 2007a]. In this case, the jurisdictional authority had not determined the medical performance requirements for either the Pack Test or wildland fire fighting.

Occupational Medical Standards for Structural Fire Fighters. NFPA 1582, Standard on Comprehensive Occupational Medical Program for Fire Departments, establishes medical requirements for structural fire fighters [NFPA 2007b]. It stipulates conducting medical evaluations of candidates prior to training programs or participation in departmental emergency response activities. These requirements could be modified for individuals involved in suppressing wildland fires [NFPA 2007b].

NFPA 1582 currently recommends conducting exercise stress tests on members over the age of 45 with two or more CAD risk factors (hypercholesterolemia, hypertension, smoking, diabetes mellitus, or family history of premature CAD) [NFPA 2007b]. These recommendations are similar to those of the American College of Cardiology (ACC)/American Heart Association (AHA) [Gibbons et al. 2002]. The FF had two risk factors for CAD (hypercholesterolemia and hypertension), therefore an exercise stress test would have been indicated. Currently, the Fire Department does not require annual medical evaluations or exercise stress tests for members. Had the Fire Department been conducting medical evaluation as recommended by NFPA 1582, the FF would have undergone an exercise stress test to determine his medical fitness-for-duty. It is possible his underlying cardiac vulnerability would have been detected, and he may have received preventative cardiac intervention.


The NIOSH investigator offers the following recommendations to prevent a similar episode and to address general safety and health issues.

Recommendation #1: Check the vital signs of participants before and after the work capacity test.

NFES 1109, Work Capacity Test Administrator's Guide, requires that an EMT (or someone with equivalent qualifications) observe candidates during and after the test, and be available to provide emergency medical assistance, if needed [NWCG 2003]. The EMT should take participant vital signs (pulse, blood pressure, and respirations) before and after the WCT to ensure that the participant does not have a precluding condition prior to the test, and that the participant's vital signs return to normal levels after the test.

Recommendation #2: Utilize a comprehensive medical form such as Standard Form 78 or the Federal Interagency Annual Medical History and Clearance Form for Arduous Duty Wildland Firefighters instead of the PAR-Q to determine medical clearance for the work capacity test.  

The PAR-Q is a seven question health screening questionnaire designed to identify individuals who should seek medical advice before involvement in moderate activity. A "no" answer to all 7 questions indicates suitability for involvement in an exercise test for moderately vigorous aerobic and muscular fitness training. A "yes" answer to one or more questions requires the individual to talk with his/her doctor before becoming much more physically active, or before a fitness appraisal. However, the PAR-Q does not forbid the individual from taking the Pack Test. The PAR-Q (located in Appendix B of the WCT Administrator's Guide [NWCG 2003]) and page 42 of the Fitness and Work Capacity [NWCG 1997], is completed by the individual taking the Pack Test, and does not cover all CAD risk factors identified by the AHA/ACC. The WCT Administrator makes the decision whether the fire fighter is fit to perform the WCT, but frequently doesn't have the medical background or training on when to preclude individuals from taking the Pack Test. The State should require medical clearance prior to the fire fighter performing the WCT using either: 1) "SF-78, Certificate of Medical Examination" ( (Link Updated 1/15/2013), or 2) "FS Form 5100/6180" (Attachment 1).

Recommendation #3: Provide pre-placement and periodic medical evaluations to ALL fire fighters consistent with National Fire Protection Association (NFPA) 1582 (or equivalent) to determine their medical ability to perform duties without presenting a significant risk to the safety and health of themselves or others.  

NFPA 1582 requires fire departments to conduct pre-placement and annual medical evaluations. Guidance regarding the content and frequency of these evaluations can be found in NFPA 1582 and in the International Association of Fire Fighters (IAFF)/International Association of Fire Chiefs (IAFC) Fire Service Joint Labor Management Wellness/Fitness Initiative [NFPA 2007b; IAFF, IAFC 2000]. However, the Fire Department is not legally required to follow this standard or this initiative. Applying this recommendation involves economic repercussions and may be particularly difficult for small, volunteer fire departments to implement. NFPA 1500, Standard on Fire Department Occupational Safety and Health Program, Chapters 8-7.1 and 8-7.2 and the National Volunteer Fire Council (NVFC) Health and Wellness Guide address these issues [NFPA 2007c; USFA 2004].

To overcome the financial obstacle, the Fire Department could urge current members to get annual medical clearances from their private physicians. Another option is having the annual medical evaluations completed by paramedics and EMTs from the local Emergency Medical Service (vital signs, height, weight, visual acuity, and EKG). This information could then be provided to a community physician (perhaps volunteering his or her time), who could review the data and provide medical clearance (or further evaluation, if needed). The more extensive portions of the medical evaluations could be performed by a private physician at the fire fighter's expense (personal or through insurance), provided by a physician volunteer, or paid for by the Fire Department. Sharing the financial responsibility for these evaluations between fire fighters, the Fire Department, and physician volunteers may reduce the negative financial impact on recruiting and retaining needed fire fighters. The average age of fire fighters is 60. This fire department is located in a very rural area and has difficulty in obtaining and retaining membership.

Recommendation #4: Ensure that fire fighters are cleared for duty by a physician knowledgeable about the physical demands of firefighting.

Physicians providing input regarding medical clearance for firefighting duties should be knowledgeable about the physical demands of firefighting and familiar with the consensus guidelines published in NFPA 1582, NFPA 1051, NFES 1596, and NFES 1109 [NFPA 2007b; NFPA 2007a; NWCG 1997; NWCG 2003]. To ensure physicians are aware of these guidelines, we recommend that the Fire Department provide the private physicians of its members with a copy of these guidelines. In addition, we recommend that all return-to-work clearances be reviewed by a Fire Department- or State-contracted physician. This decision requires knowledge not only of the member's medical condition, but also of the member's job duties. Frequently, private physicians are not familiar with a member's job duties or with guidance documents such as NFPA 1582, NFPA 1051, NFES 1596, and NFES 1109. Thus, the final decision regarding medical clearance for return to work lies with the Fire Department, with input from many sources, including the employee's private physician.

Recommendation #5:   Ensure that fire fighters participate in a mandatory wellness/fitness program designed for wildland fire fighters to reduce risk factors for cardiovascular disease and improve cardiovascular capacity.

Physical inactivity is the most prevalent modifiable risk factor for CAD in the United States. Additionally, physical inactivity, or lack of exercise, is associated with other risk factors, namely obesity and diabetes [Plowman and Smith 1997]. NFPA 1500 requires that a Fire Department have a wellness program that provides health promotion activities for preventing health problems and enhancing overall well-being [NFPA 2007c]. Wellness programs have been shown to be cost effective, typically by reducing the number of work-related injuries and lost work days [Maniscalco et al. 1999; Stein et al. 2000; Aldana 2001]. Health promotion programs in the fire service have been shown to reduce CAD risk factors and improve fitness levels, with mandatory programs showing the most benefit [Blevins et al. 2006; Dempsey et al. 2002; Womack et al. 2005]. One mandatory program was able to show a cost savings of $68,741 due to reduced absenteeism [Stevens et al. 2002]. A similar cost savings has been reported by the wellness program at the Phoenix Fire Department, where a 12-year commitment has resulted in a significant reduction in their disability pension costs [City Auditor, City of Phoenix, AZ 1997]. Guidance for implementation and components of a comprehensive wellness/fitness program are found in NFPA 1583, Standard on Health-Related Fitness Programs for Fire Department Members [NFPA 2008], and in the IAFF/IAFC's Fire Service Joint Labor Management Wellness/Fitness Initiative [IAFF, IAFC 2000].

For wildland fire fighters, NFES 1596 and NFPA 1051 address wellness/fitness issues. As mentioned previously, NFES 1596, Fitness and Work Capacity, provides information on fitness, work capacity, nutrition, hydration, the environment, work hardening, and injury prevention for wildland fire fighters [NWCG 1997].

NFPA 1051, Standard forWildland Fire Fighter Professional Qualifications, addresses medical and job-related physical performance requirements for entry-level wildland fire fighters. It recommends that the jurisdictional authority determine what those requirements shall be [NFPA 2007a]. The State should ensure that local Fire Departments are aware of the physical demands of wildland firefighting, and that the wildland fire fighters participate in a wellness/fitness program designed for wildland fire fighters.

Recommendation #6: Perform an annual physical performance (physical ability) evaluation to ensure fire fighters are physically capable of performing the essential job tasks of structural firefighting.

NFPA 1500 requires Fire Department members who engage in emergency operations to be annually evaluated and certified by the Fire Department as having met the physical performance requirements identified in paragraph 8-2.1 of the standard [NFPA 2007c].  

Recommendation #7: Provide fire fighters with medical evaluations and clearance to wear self-contained breathing apparatus (SCBAs).

The Occupational Safety and Health Administration (OSHA)'s Revised Respiratory Protection Standard requires employers to provide medical evaluations and clearance for employees using respiratory protection [CFR 20061]. Such employees include fire fighters who utilize SCBA in the performance of their duties. These clearance evaluations are required for private industry employees and public employees in States operating OSHA-approved State plans. Idaho is not a State-plan State, and public sector employers are not required to comply with OSHA standards. However, we recommend voluntary compliance to enhance safety and health.  

Recommendation #8 : Perform an autopsy on all on-duty fire fighter fatalities.

In 2008, the USFA published the Firefighter Autopsy Protocol [USFA 2008]. With this publication, the USFA hopes to provide "a more thorough documentation of the causes of firefighter deaths for three purposes:

Code of Federal Regulations. See CFR in references.


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This investigation was conducted by and the report written by:

Tommy N. Baldwin, MS
Safety and Occupational Health Specialist

Mr. Baldwin, a National Association of Fire Investigators (NAFI) Certified Fire and Explosion Investigator, an International Fire Service Accreditation Congress (IFSAC) Certified Fire Officer I, a Kentucky Certified Fire Fighter and Emergency Medical Technician (EMT), and a former Fire Chief, is with the NIOSH Fire Fighter Fatality Investigation and Prevention Program, Cardiovascular Disease Component located in Cincinnati, Ohio.

Attachment 1
Attachment 1. Page 1. US Dept of Ag letter to Employer for Forest Service requirements to fill Health Screening Questionnaire before conditioning for Work Capacity Test

Attachment 1. Page 2. US Dept of Ag letter to Employer for Forest Service requirements to fill Health Screening Questionnaire before conditioning for Work Capacity Test

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