National Registry of Certified Medical Examiners (NRCME) DOT Practice Exam

Which cardiac condition is disqualifying?

1. Hypertrophic cardiomyopathy

2. Mitral valve prolapse

3. Ebstein anomaly

4. Aortic valve repair for aortic stenosis 4 months prior to exam

The correct answer is: Hypertrophic cardiomyopathy

Hypertrophic cardiomyopathy is considered disqualifying due to its association with an increased risk of sudden cardiac events, particularly during vigorous physical activity. This condition is characterized by an abnormal thickening of the heart muscle, which can obstruct blood flow and disrupt the heart's electrical system. Because commercial drivers are often required to engage in activities that can place additional stress on the heart, the potential for serious complications makes individuals with hypertrophic cardiomyopathy ineligible for certification. In contrast, mitral valve prolapse typically does not pose a significant risk and may not be disqualifying unless there are additional complications such as severe regurgitation. Ebstein anomaly, a rare heart defect, may be disqualifying depending on severity and symptoms, but not all cases are treated the same way. Aortic valve repair for aortic stenosis four months prior to the exam may require a waiting period, but if the driver is symptom-free and has been cleared by a cardiologist, they may still qualify for certification.