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Sudden cardiac death in Air Force recruits. A 20-year review
Insights
Sudden cardiac death in young, healthy adults is rare but often linked to strenuous physical exertion. Myocarditis was the most common cause identified in US Air Force recruits experiencing sudden cardiac death during basic training.
Area of Science:
- Cardiology
- Sports Medicine
- Public Health
Background:
- Sudden cardiac death (SCD) is a critical concern in young, seemingly healthy individuals.
- Understanding the causes and risk factors for SCD in military recruits is essential for training safety.
Purpose of the Study:
- To investigate the incidence and causes of SCD among US Air Force recruits during basic training.
- To identify the role of strenuous physical exertion in SCD within this population.
Main Methods:
- Retrospective review of clinical and autopsy records for recruits aged 17-28 years.
- Analysis of deaths occurring during a 42-day basic training period between 1965 and 1985.
- Correlation of SCD with physical exertion and underlying cardiac pathology.
Main Results:
- 19 cases of SCD occurred among 1,606,167 recruits (incidence of 0.017 deaths per 50,000 exercise-hours).
- Sixteen SCD cases (all male) were attributed to underlying structural heart disease; myocarditis was the most frequent etiology.
- Strenuous physical exertion was associated with 17 of the 19 SCD cases.
Conclusions:
- SCD in healthy young adults is rare and strongly associated with physical exertion.
- Underlying structural heart disease, particularly myocarditis, is a significant factor in exertional SCD among recruits.
- These findings highlight the importance of cardiac screening and monitoring during intense physical training programs.
Abstract:
We reviewed the clinical and autopsy records of the 19 sudden cardiac deaths that occurred among the 1,606,167 US Air Force healthy, medically screened recruits (90% male; 17 to 28 years old) during a 42-day basic training period between 1965 and 1985. Sixteen (all male) died suddenly of underlying structural heart disease, whereas no anatomic cause of death was identified in the remaining three. Thirty-two nonsudden, noncardiac deaths occurred during the same period, and only two had structural heart disease. Strenuous physical exertion was associated with sudden death in 17 of 19 cases (0.017 deaths per 50,000 exercise-hours), and the most frequent underlying etiology was myocarditis. Sudden cardiac death, a rare event in healthy young adults, is usually associated with exertion.