What is the most common cause of tachycardia induced cardiomyopathy?

Tachycardia induced cardiomyopathy is primarily driven by persistent tachycardia that can lead to a decline in cardiac function. Atrial fibrillation is indeed the most common cause of this condition because it often results in a sustained elevated heart rate that can exceed the threshold necessary to impair myocardial function. The rapid and irregular heart rates associated with atrial fibrillation can lead to increased myocardial oxygen demand and impaired ventricular filling, ultimately resulting in reduced cardiac output and cardiomyopathy.

Other conditions like coronary artery disease, hypertension, and myocarditis can lead to different types of heart failure or cardiomyopathy, but they do not typically cause tachycardia induced cardiomyopathy specifically. In those conditions, the mechanism of heart failure is different—often related to vascular issues, structural heart changes, or inflammatory processes—rather than being directly associated with the rapid heart rates that characterize atrial fibrillation. Therefore, recognizing atrial fibrillation as a common and critical contributor to tachycardia induced cardiomyopathy is essential for management and treatment.