Table 2.

Diagnosis and management of left ventricular outflow tract obstruction in HCM patients

Left ventricular outflow tract obstruction

1. 1/3 are non-obstructive

2. 1/3 are obstructive (peak Doppler pressure gradient ≥ 30 mmHg at rest)

3. 1/3 are labile-obstructive with significant gradient during provocation or exercise

4. Pharmacological provocation is not recommended

5. Gradient of ≥ 50 mmHg is considered of hemodynamical importance

6. Myectomy or alcohol septal ablation (ASA) should be considered if the patients have moderate to severe symptoms and a gradient ≥ 50 mmHg