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Update: Exertional Rhabdomyolysis, Active Component, U.S. Armed Forces, 2015–2019

Midshipmen from the U.S Naval Academy Class of 2016 conduct a log carrying exercise. (U.S. Navy photo by Mass Communication Specialist 2nd Class Todd Frantom) Midshipmen from the U.S Naval Academy Class of 2016 conduct a log carrying exercise. (U.S. Navy photo by Mass Communication Specialist 2nd Class Todd Frantom)

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Medical Surveillance Monthly Report

ABSTRACT

Among active component service members in 2019, there were 512 incident cases of exertional rhabdomyolysis, for an unadjusted incidence rate of 38.9 cases per 100,000 person-years (p-yrs). Subgroup-specific rates in 2019 were highest among males, those less than 20 years old, non-Hispanic black service members, Army or Marine Corps members, and those in “other/unknown” or combat-specific occupations. During 2015–2019, crude rates of exertional rhabdomyolysis fluctuated between a low of 35.2 per 100,000 p-yrs in 2015 and a high of 42.4 per 100,000 p-yrs in 2018, after which the rate decreased to 38.9 per 100,000 p-yrs in 2019. Compared to service members in other race/ethnicity groups, non-Hispanic blacks had the highest overall rate of exertional rhabdomyolysis in every year except 2018. Overall and annual rates were highest among Marine Corps members, intermediate among those in the Army, and lowest among those in the Air Force and Navy. Most cases of exertional rhabdomyolysis were diagnosed at installations that support basic combat/recruit training or major ground combat units of the Army or the Marine Corps. Medical care providers should consider exertional rhabdomyolysis in the differential diagnosis when service members (particularly recruits) present with muscular pain or swelling, limited range of motion, or the excretion of darkened urine after strenuous physical activity, especially in hot, humid weather.

WHAT ARE THE NEW FINDINGS?   

During the 5-year period, the annual numbers and rates of incident exertional rhabdomyolysis cases peaked in 2018 and then dropped in 2019. Exertional rhabdomyolysis continued to occur most frequently from late spring through early fall at installations that support basic combat/recruit training or major Army or Marine Corps combat units.

WHAT IS THE IMPACT ON READINESS AND FORCE HEALTH PROTECTION?

Prompt recognition and treatment of exertional rhabdomyolysis usually prevent severe complications. However, some service members who experience exertional rhabdomyolysis may be at risk for recurrences, which may limit their military effectiveness and potentially predispose them to serious injury. Moreover, untimely recurrences may compromise a unit’s mission. Commanders and supervisors should be vigilant for early signs of exertional heat injuries and, when such signs are detected, should intervene aggressively.

BACKGROUND

Rhabdomyolysis is characterized by the breakdown of skeletal muscle cells and the subsequent release of intracellular muscle contents into the circulation. The characteristic triad of rhabdomyolysis includes weakness, myalgias, and red to brown urine (due to myoglobinuria) accompanied by an elevated serum concentration of creatine kinase.1,2 In exertional rhabdomyolysis, damage to skeletal muscle is generally caused by high-intensity, protracted, or repetitive physical activity, usually after engaging in unaccustomed strenuous exercise (especially with eccentric and/or muscle-lengthening contractions).3 Even athletes who are used to intense training and who are being carefully monitored are at risk of this condition,4especially if new overexertion-inducing exercises are being introduced.5 Illness severity ranges from elevated serum muscle enzyme levels without clinical symptoms to life-threatening disease associated with extreme enzyme elevations, electrolyte imbalances, and acute kidney failure.1–3,6

Risk factors for exertional rhabdomyolysis include exertion in hot and humid conditions, younger age, male sex, a lower level of physical fitness, a prior heat illness, impaired sweating, and a lower level of education.1,3,7–10 Acute kidney injury, due to an excessive concentration of free myoglobin in the urine accompanied by volume depletion, renal tubular obstruction, and renal ischemia, represents a serious complication of rhabdomyolysis.6,11 Severely affected patients can also develop compartment syndrome, fever, dysrhythmias, metabolic acidosis, and altered mental status.10

In U.S. military members, rhabdomyolysis is a significant threat during physical exertion, particularly under heat stress.7,9,12 Moreover, although rhabdomyolysis can affect any service member, new recruits, who are not yet accustomed to the physical exertion required of basic training, may be at particular risk.9 Each year, the MSMR summarizes the numbers, rates, trends, risk factors, and locations of occurrences of exertional heat injuries, including exertional rhabdomyolysis. This report includes the data for 2015–2019. Additional information about the definition, causes, and prevention of exertional rhabdomyolysis can be found in previous issues of the MSMR.12

METHODS

The surveillance period was 1 January 2015 through 31 December 2019. The surveillance population included all individuals who served in the active component of the Army, Navy, Air Force, or Marine Corps at any time during the surveillance period. All data used to determine incident exertional rhabdomyolysis diagnoses were derived from records routinely maintained in the Defense Medical Surveillance System (DMSS). These records document both ambulatory encounters and hospitalizations of active component members of the U.S. Armed Forces in fixed military and civilian (if reimbursed through the Military Health System [MHS]) treatment facilities worldwide. In-theater diagnoses of exertional rhabdomyolysis were identified from medical records of service members deployed to Southwest Asia/Middle East and whose healthcare encounters were documented in the Theater Medical Data Store.

For this analysis, a case of exertional rhabdomyolysis was defined as an individual with 1) a hospitalization or outpatient medical encounter with a diagnosis in any position of either “rhabdomyolysis” (International Classification of Diseases, 9th Revision [ICD-9]: 728.88; International Classification of Diseases, 10th Revision [ICD-10]: M62.82) or “myoglobinuria” (ICD-9: 791.3; ICD-10: R82.1) plus a diagnosis in any position of 1 of the following: “volume depletion (dehydration)” (ICD-9: 276.5*; ICD-10: E86.0, E86.1, E86.9), “effects of heat and light” (ICD-9: 992.0–992.9; ICD-10: T67.0*–T67.9*), “effects of thirst (deprivation of water)” (ICD-9: 994.3; ICD-10: T73.1*), “exhaustion due to exposure” (ICD-9: 994.4; ICD-10: T73.2*), or “exhaustion due to excessive exertion (overexertion)” (ICD-9: 994.5; ICD-10: T73.3*).13 Each individual could be considered an incident case of exertional rhabdomyolysis only once per calendar year.

To exclude cases of rhabdomyolysis that were secondary to traumatic injuries, intoxications, or adverse drug reactions, medical encounters with diagnoses in any position of “injury, poisoning, toxic effects” (ICD-9: 800.*–999.*; ICD-10: S00.*–T88.*, except the codes specific for “sprains and strains of joints and adjacent muscles” and “effects of heat, thirst, and exhaustion”) were not considered indicative of exertional rhabdomyolysis.13

For surveillance purposes, a “recruit trainee” was defined as an active component member in an enlisted grade (E1–E4) who was assigned to 1 of the services’ recruit training locations (per the individual’s initial military personnel record). For this report, each service member was considered a recruit trainee for the period of time corresponding to the usual length of recruit training in his or her service. Recruit trainees were considered a separate category of enlisted service members in summaries of rhabdomyolysis cases by military grade overall.

In-theater diagnoses of exertional rhabdomyolysis were analyzed separately; however, the same case-defining criteria and incidence rules were applied to identify incident cases. Records of medical evacuations from the U.S. Central Command (CENTCOM) area of responsibility (AOR) (e.g., Iraq and Afghanistan) to a medical treatment facility outside the CENTCOM AOR also were analyzed separately. Evacuations were considered case defining if affected service members met the above criteria in a permanent military medical facility in the U.S. or Europe from 5 days before to 10 days after their evacuation dates.

The new electronic health record for the MHS, MHS GENESIS, was implemented at 4 military treatment facilities in the state of Washington in 2017 (Naval Hospital Oak Harbor, Naval Hospital Bremerton, Air Force Medical Services Fairchild, and Madigan Army Medical Center). Implementation of the second wave of MHS GENESIS sites began in 2019 and included 3 facilities in California (Travis Air Force Base [AFB], the Presidio of Monterey, and Naval Air Station Lemoore) and 1 in Idaho (Mountain Home AFB). Medical data from facilities using MHS GENESIS are not available in the DMSS. Therefore, medical encounter data for individuals seeking care at any of these facilities after their conversion to MHS GENESIS during 2017–2019 were not included in the current analysis.

RESULTS

In 2019, there were 512 incident cases of rhabdomyolysis likely associated with physical exertion and/or heat stress (exertional rhabdomyolysis) (Table 1). The crude (unadjusted) incidence rate was 38.9 cases per 100,000 person-years (p-yrs). Subgroup-specific incidence rates of exertional rhabdomyolysis were highest among males (43.3 per 100,000 p-yrs), those less than 20 years old (88.0 per 100,000 p-yrs), non-Hispanic black service members (66.1 per 100,000 p-yrs), Marine Corps or Army members (91.9 per 100,000 p-yrs and 47.3 per 100,000 p-yrs, respectively), and those in “other/unknown” or combat-specific occupations (72.1 per 100,000 p-yrs and 66.0 per 100,000 p-yrs, respectively) (Table 1). Of note, the incidence rate among recruit trainees was more than 6 times that among other enlisted members and officers, even though cases among this group accounted for only 13.3% of all cases in 2019.

During the surveillance period, crude rates of exertional rhabdomyolysis fluctuated between a low of 35.2 per 100,000 p-yrs in 2015 and a high of 42.4 per 100,000 p-yrs in 2018, after which the rate decreased to 38.9 per 100,000 p-yrs in 2019 (Figure 1). The annual incidence rates of exertional rhabdomyolysis were highest among non-Hispanic blacks in every year except 2018, when the highest rate occurred among Asian/Pacific Islanders (data not shown). Overall and annual rates of incident exertional rhabdomyolysis were highest among service members in the Marine Corps, intermediate among those in the Army, and lowest among those in the Air Force and Navy (Table 1, Figure 2). Among Marine Corps and Army members, annual rates increased between 2015 and 2018 (35.7% and 21.0% increases, respectively) and then dropped in 2019 (Figure 2). Annual rates among Navy members increased 41.1% over the course of the 5-year surveillance period, while rates among service members in the Air Force remained relatively stable. During 2015–2019, approximately three-quarters (75.3%) of the cases occurred between May and October (Figure 3).

Rhabdomyolysis by location

During the 5-year surveillance period, the medical treatment facilities at 13 installations diagnosed at least 50 cases each; when combined, these installations diagnosed more than half (57.3%) of all cases (Table 2). Of these 13 installations, 4 provide support to recruit/basic combat training centers (Marine Corps Recruit Depot [MCRD] Parris Island/Beaufort, SC; Fort Benning, GA; Joint Base San Antonio–Lackland, TX; and Fort Leonard Wood, MO). In addition, 6 installations support large combat troop populations (Fort Bragg, NC; Marine Corps Base [MCB] Camp Pendleton, CA; MCB Camp Lejeune/Cherry Point, NC; Fort Shafter, HI; Fort Hood, TX; and Fort Campbell, KY). During 2015–2019, the most cases overall were diagnosed at MCRD Parris Island/Beaufort, SC (n=282), and Fort Bragg, NC (n=274), which together accounted for more than one-fifth (21.8%) of all cases (Table 2).

Rhabdomyolysis in Iraq and Afghanistan

There were 7 incident cases of exertional rhabdomyolysis diagnosed and treated in Iraq/Afghanistan during the 5-year surveillance period (data not shown). Deployed service members who were affected by exertional rhabdomyolysis were most frequently non-Hispanic black or non-Hispanic white (n=5; 71.4% and n=2; 28.6%, respectively), male (n=7), aged 20–29 years (n=4; 57.1%), in the Army (n=7), enlisted (n=7), and in communication/intelligence (n=2; 28.6%) or repair/engineering occupations (n=2; 28.6%). One active component service member was medically evacuated from Iraq/Afghanistan for exertional rhabdomyolysis during the surveillance period; this medical evacuation occurred in September 2015 (data not shown).

EDITORIAL COMMENT

This report documents that the crude annual incidence rates of exertional rhabdomyolysis among active component U.S. military members fluctuated between a low of 35.2 per 100,000 p-yrs in 2015 and a high of 42.4 per 100,000 p-yrs in 2018, after which rates decreased to 38.9 per 100,000 p-yrs (8.2% decrease) in 2019. Exertional rhabdomyolysis continued to occur most frequently from late spring through early fall at installations that support basic combat/recruit training or major Army or Marine Corps combat units.

The risks of heat injuries, including exertional rhabdomyolysis, are elevated among individuals who suddenly increase overall levels of physical activity, recruits who are not physically fit when they begin training, and recruits from relatively cool and dry climates who may not be acclimated to the high heat and humidity at training camps in the summer.1,2,9 Soldiers and Marines in combat units often conduct rigorous unit physical training, personal fitness training, and field training exercises regardless of weather conditions. Thus, it is not surprising that recruit camps and installations with large ground combat units account for most of the cases of exertional rhabdomyolysis.

The annual incidence rates among non-Hispanic black service members were higher than the rates among members of other race/ethnicity groups in 4 of the 5 previous years, with the exception of 2018. This observation has been attributed, at least in part, to an increased risk of exertional rhabdomyolysis among individuals with sickle cell trait14–17 and is supported by at least 1 other study among U.S. service members.9 Supervisors at all levels should ensure that guidelines to prevent heat injuries are consistently implemented and should be vigilant for early signs of exertional heat injuries, including rhabdomyolysis, among all service members.

The findings of this report should be interpreted with consideration of its limitations. A diagnosis of “rhabdomyolysis” alone does not indicate the cause. Ascertainment of the probable causes of cases of exertional rhabdomyolysis was attempted by using a combination of ICD-9/ICD-10 diagnostic codes related to rhabdomyolysis with additional codes indicative of the effects of exertion, heat, or dehydration. Furthermore, other ICD-9/ICD-10 codes were used to exclude cases of rhabdomyolysis that may have been secondary to trauma, intoxication, or adverse drug reactions.

The measures that are effective at preventing exertional heat injuries in general apply to the prevention of exertional rhabdomyolysis. In the military training setting, the risk of exertional rhabdomyolysis can be reduced by emphasizing graded, individual preconditioning before starting a more strenuous exercise program and by adhering to recommended work/rest and hydration schedules, especially in hot weather. The physical activities of overweight and/or previously sedentary new recruits should be closely monitored. Strenuous activities during relatively cool mornings following days of high heat stress should be particularly closely monitored; in the past, such situations have been associated with increased risk of exertional heat injuries (including rhabdomyolysis).8

Management after treatment for exertional rhabdomyolysis, including the decision to return to physical activity and duty, is a persistent challenge among athletes and military members.9,10,18It is recommended that those who have had a clinically confirmed exertional rhabdomyolysis event be further evaluated and risk stratified for recurrence before return to activity/duty.10,18–20Low-risk patients may gradually return to normal activity levels, while those deemed high risk for recurrence will require further evaluative testing (e.g., genetic testing for myopathic disorders).18,19

Commanders and supervisors at all levels should be vigilant for early signs of exertional heat injuries and should intervene aggressively when dangerous conditions, activities, or suspicious illnesses are detected. Finally, medical care providers should consider exertional rhabdomyolysis in the differential diagnosis when service members (particularly recruits) present with muscular pain or swelling, limited range of motion, or the excretion of darkened urine (possibly due to myoglobinuria) after strenuous physical activity, especially in hot, humid weather.

REFERENCES

1.  Zutt R, van der Kooi AJ, Linthorst GE, Wanders RJ, de Visser M. Rhabdomyolysis: review of the literature. Neuromuscul Disord. 2014;24(8):651–659.

2.  Giannoglou GD, Chatzizisis YS, Misirli G. The syndrome of rhabdomyolysis: pathophysiology and diagnosis. Eur J Intern Med. 2007;18(2):90–100.

3.  Rawson ES, Clarkson PM, Tarnopolsky MA. Perspectives on exertional rhabdomyolysis. Sports Med. 2017;47(suppl 1):33–49.

4.  McKewon S. Two Nebraska football players hospitalized, treated after offseason workout. Omaha World-Herald. 20 January 2019. https://www.omaha.com/huskers/football/two-nebraskafootball-players-hospitalized-treated-after-offseason-workout/article_d5929674-53a7-5d90-803e-6b4e9205ee60.html. Accessed 10 March 2020.

5.  Raleigh MF, Barrett JP, Jones BD, Beutler AI, Deuster PA, O'Connor FG. A cluster of exertional rhabdomyolysis cases in a ROTC program engaged in an extreme exercise program. Mil Med. 2018;183(suppl 1):516–521.

6.  Bosch X, Poch E, Grau JM. Rhabdomyolysis and acute kidney injury. N Engl J Med. 2009;361(1):62–72.

7.  Hill OT, Wahi MM, Carter R, Kay AB, McKinnon CJ, Wallace RF. Rhabdomyolysis in the U.S. active duty Army, 2004–2006. Med Sci Sports Exerc. 2012;44(3):442–449.

8.  Lee G. Exercise-induced rhabdomyolysis. R I Med J (2013). 2014;97(11):22–24.

9.  Hill OT, Scofield DE, Usedom J, et al. Risk factors for rhabdomyolysis in the U.S. Army. Mil Med. 2017;182(7):e1836–e1841.

10.  Knapik JJ, O’Connor FG. Exertional rhabdomyolysis: epidemiology, diagnosis, treatment, and prevention. J Spec Oper Med. 2016;15(3):65–71.

11.  Holt S, Moore K. Pathogenesis of renal failure in rhabdomyolysis: the role of myoglobin. Exp Nephrol. 2000;8(2):72–76.

12.  Armed Forces Health Surveillance Branch. Update: Exertional rhabdomyolysis among active component members, U.S. Armed Forces, 2014–2018. MSMR. 2019;26(4):21–26.

13.  Armed Forces Health Surveillance Branch. Surveillance case definition. Exertional rhabdomyolysis. https://www.health.mil/Reference-Center/Publications/2017/03/01/Rhabdomyolysis-Exertional. Accessed 10 March 2020.

14.  Gardner JW, Kark JA. Fatal rhabdomyolysis presenting as mild heat illness in military training. Mil Med. 1994;159(2):160–163.

15.  Makaryus JN, Catanzaro JN, Katona KC. Exertional rhabdomyolysis and renal failure in patients with sickle cell trait: is it time to change our approach? Hematology. 2007;12(4):349–352.

16.  Ferster K, Eichner ER. Exertional sickling deaths in Army recruits with sickle cell trait. Mil Med. 2012;177(1):56–59.

17.  Nelson DA, Deuster PA, Carter R, Hill OT, Wolcott VL, Kurina LM. Sickle cell trait, rhabdomyolysis, and mortality among U.S. Army soldiers. N Engl J Med. 2016;375(5):435–442.

18.  O’Connor FG, Brennan FH Jr, Campbell W, Heled Y, Deuster P. Return to physical activity after exertional rhabdomyolysis. Curr Sports Med Rep. 2008;7(6):328–331.

19.  Atias D, Druyan A, Heled Y. Recurrent exertional rhabdomyolysis: coincidence, syndrome, or acquired myopathy? Curr Sports Med Rep. 2013;12(6):365–369.

20.  O’Connor FG, Deuster P, Leggit J, et al. Clinical Practice Guideline for the Management of Exertional Rhabdomyolysis in Warfighters. Bethesda, Maryland: Uniformed Services University. 2017.

Incident cases and incidence rates of extertional rhabdomyolysis, by source of report and year of diagnosis, active component, U.S. Armed Forces, 2015–2019

Annual incidence rates of exertional rhabdomyolysis, by service, active component, U.S. Armed Forces, 2015–2019

Cumulative numbers of exertional rhabdomyolysis cases, by month of diagnosis, active component, U.S. Armed Forces, 2015–2019

 Incident casesa and incidence ratesb of exertional rhabdomyolysis, by demographic and military characteristics, active component, U.S. Armed Forces, 2019

Incident cases of exertional rhabdomyolysis, by installation (with at least 30 cases during the period), active component, U.S. Armed Forces, 2015–2019

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