Hi.
My husband was diagnosed with HCM when he was 43 when he started taking atenolol, symptom free for years. Then in 2016 he experienced shortness of breath on exertion, meds increased and was kind of ok until he started having syncope and I wouldn’t let him take walks alone ( we live in the mountains) one evening his heart rate dropped to 30 and he was taken to hospital and had an ICD implanted that was March 2018, he was still functioning but struggled often, his HCM became obstructive so October that year he had surgery and the rest you know, he is fit and well and symptom free.