In a 23-year-old male experiencing syncope and a mid-systolic murmur, which diagnosis is most likely?

Hypertrophic Cardiomyopathy is a condition that is often associated with syncope, particularly in young individuals, such as the 23-year-old male presented in the scenario. This condition involves abnormal thickening of the heart muscle, specifically the interventricular septum, which can lead to outflow obstruction and altered cardiac function. The mid-systolic murmur that is noted is commonly heard in patients with Hypertrophic Cardiomyopathy due to the dynamics of blood flow through the left ventricular outflow tract during systole, which is altered by the hypertrophied muscle.

Syncope can occur in Hypertrophic Cardiomyopathy due to several factors, including exertion leading to reduced cardiac output or arrhythmias, both of which can precipitate fainting episodes. Recognizing the presentation of syncope in conjunction with a mid-systolic murmur is essential in identifying this diagnosis.

While aortic stenosis also can present with a mid-systolic murmur and syncope, it is typically seen more often in older adults due to calcific degeneration of the aortic valve. Additionally, mitral regurgitation and pulmonic stenosis are less likely to be the primary considerations in this demographic and presentation. Mitral regurgitation