Non-familial dilated cardiomyopathy

Non-familial dilated cardiomyopathy (also referred to as sporadic or idiopathic dilated cardiomyopathy when no familial component is identified) is a form of dilated cardiomyopathy (DCM) that occurs in individuals without a clear family history of the condition. In this disease, the left ventricle (or both ventricles) of the heart becomes enlarged (dilated) and weakened, impairing the heart's ability to pump blood efficiently. Unlike familial forms of DCM, non-familial cases may arise from a variety of acquired or multifactorial causes, including prior viral myocarditis, chronic alcohol use, exposure to cardiotoxic agents, autoimmune mechanisms, or other environmental triggers, though in many cases the precise cause remains unknown (truly idiopathic). The primary body system affected is the cardiovascular system. Key clinical features include progressive heart failure with symptoms such as shortness of breath (dyspnea), fatigue, exercise intolerance, peripheral edema (swelling of the legs and ankles), and palpitations. Patients may also be at increased risk for cardiac arrhythmias and thromboembolic events, including stroke. Echocardiography typically reveals left ventricular dilation with reduced ejection fraction. The condition can range from mild impairment to severe heart failure requiring advanced therapies. Treatment follows standard heart failure management guidelines and includes pharmacological therapies such as ACE inhibitors or angiotensin receptor-neprilysin inhibitors (ARNIs), beta-blockers, mineralocorticoid receptor antagonists, and SGLT2 inhibitors. Diuretics are used for symptom relief of fluid overload. Anticoagulation may be considered in patients with atrial fibrillation or intracardiac thrombus. In patients with significant conduction abnormalities or risk of sudden cardiac death, implantable cardioverter-defibrillators (ICDs) or cardiac resynchronization therapy (CRT) may be indicated. In refractory cases, left ventricular assist devices (LVADs) or heart transplantation may be necessary. Identification and treatment of any underlying reversible cause is an important component of management.

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