A Study to Assess the Real-World Effectiveness of Mavacamten in Adult Patients With Obstructive Hypertrophic Cardiomyopathy in China

Inclusion Criteria: * Participants aged ≥ 18 years (participants enrolled retrospectively: at the time of initial mavacamten prescription), irrespective of gender. * Participants who have initiated mavacamten (for whom enrolled retrospectively) or are scheduled to initiate mavacamten (for whom enrolled prospectively) based on clinical therapeutic needs. * Diagnosed with obstructive hypertrophic cardiomyopathy (HCM) consistent with current American College of Cardiology Foundation/American Heart Association, European Society of Cardiology, and Chinese guidelines for diagnosis and treatment of patients with hypertrophic cardiomyopathy, i.e., satisfy criteria below: * Has a documented diagnosis of HCM prior to enrollment, and * Peak left ventricular outflow tract (LVOT) gradient ≥ 30 mmHg at rest or with provocation in the most recent medical record within 3 months prior to enrollment as assessed by echocardiography. * Has documented left ventricular ejection fraction (LVEF) ≥ 55%, as measured by resting transthoracic echocardiography (TTE) in the most recent medical record within 3 months prior to enrollment. * New York Heart Association (NYHA) class II or III symptoms in the most recent medical record within 3 months prior to enrollment. * For participants enrolled retrospectively, essential baseline information\* and critical data\*\* must be traceable and available. At least one key follow-up time points\*\*\* is required for inclusion. Note： \* Essential baseline in…