<unk>  is associated with a low perioperative mortality and a high late survival rate. A study at the Mayo Clinic found surgical<unk>  performed to relieve outflow obstruction and severe symptoms in HCM was associated with long-term survival equivalent to that of the general population, and superior to obstructive HCM without operation. The results are shown below: + Survival (all-cause mortality) * Years With surgery Without surgery 1 98% 90% 5 96% 79% 10 83% 61% + Survival (HCM-related death) Years With surgery Without surgery 1 99% 94% 5 98% 89% 10 95% 73% + Survival (sudden cardiac death) Years With surgery Without surgery 1 100% 97% 5 99% 93% 10 99% 89% Includes 0.8% operative mortality.
Septal myectomy
Cardiomyoplasty
Heller myotomy
Ballottement
Valvulotomy
Pericardiectomy
Cellular cardiomyoplasty
Pericardial window