A septal myectomy is open heart surgery. Until Camzyos was available it was the best treatment for HOCM with severe symptoms. The best success rates are at Centres that do a lot of them, like Mayo, Cleveland and Toronto General Hospital.
I hope you consider Camzyos instead. If it doesn’t work you can look at having surgery instead. But give Camzyos a chance. That’s my experience and thankfully it works for me. I’m 75.