Table 3 Proposed definitions of success for invasive treatment of left ventricular outflow tract obstruction

Category	Metric	Goal
Symptoms	NYHA Class	<Class III
Safety	Significant procedural complications	<5%
	Procedure-related mortality	<1%
Survival	Long-term disease-related mortality	<1% per year
	Repeat procedure rate	<5%
Haemodynamic	Final gradient	<20 mm Hg