Thanks for posting the Mayo link, which I dad to compare it to my own experiences nearly two years ago. My extreme episodes of breathlessness while out walking and light-headed ness ( which I blamed on pandemic anxiety) led me to 30 days wearing a Holter monitor, which reported to my physician that I was having partial “blockages” — actually electrical issues within my heart. After one episode where I had no beat for 4.5 seconds I was referred to a cardiologist who sent me immediately to ER and subsequent admission for an emergency implantation of a two-wire pace-maker. When they could finally work me into the surgery schedule three (hospitalized) days later the actual surgery was under general anesthesia and only took 30 minutes. And I’ve been grateful for it ever since. I have about 9 yrs left on my battery. My advice is to be sure to schedule the procedure at a hospital that does high volumes of the surgery, where the doctors are very experienced. Good luck, all! 🙂