What condition is characterized by an arrhythmia caused by the degeneration of heart muscle, specifically in the right ventricle?

Arrhythmogenic Right Ventricular Dysplasia (ARVD) is a condition marked by the degeneration of heart muscle in the right ventricle, leading to life-threatening arrhythmias. In this disorder, muscle tissue is replaced by fibrous or fatty tissue, which disrupts the heart's normal electrical signaling and can cause abnormal heart rhythms. This degeneration primarily affects the right side of the heart and is often seen in younger individuals, particularly athletes. The arrhythmias associated with ARVD can result in symptoms such as palpitations, syncope, or even sudden cardiac arrest.

The other conditions listed are associated with various cardiac issues but do not specifically relate to degeneration of the heart muscle in the right ventricle. Cardiac arrest refers to the heart's inability to effectively pump blood, while myocarditis is inflammation of the heart muscle, and heart failure pertains to the heart's reduced ability to function adequately. Each of these conditions has distinct characteristics and causes that separate them from ARVD.