Valsalva SBP Drop and LVOT Obstruction

Inclusion Criteria:1: ① Age ≥ 18 years 2: ② Diagnosed with hypertrophic cardiomyopathy (HCM) by echocardiography, with or without left ventricular outflow tract obstruction 3: ③ Conscious and mentally competent, able to understand and voluntarily sign the informed consent form 4: ④ Able to cooperate with the completion of provocation tests, non-invasive dynamic hemodynamic monitoring, and relevant follow-up examinations. \- Exclusion Criteria: * 1: ① Age ≤ 18 years, or pregnant/lactating patients 2: ② Presence of other organic heart or great vessel diseases that cause left ventricular outflow tract obstruction, such as severe aortic stenosis, congenital subaortic membrane, etc. 3: ③ Complicated with persistent atrial fibrillation or other severe arrhythmias that may affect the accuracy of hemodynamic monitoring 4: ④ Previous history of interventional or surgical therapy for left ventricular outflow tract obstruction, including septal ablation or myectomy 5: ⑤ Patients with other conditions considered inappropriate by the investigators (e.g., those with absolute or relative contraindications to provocation tests) 6: ⑥ Patients currently participating in other clinical studies.