I found the monitoring during treatment really good - I got Atrial Fibrillation (AF) during Taxol but almost certainly not caused by Taxol, probably a mixture of things - my age (smack in AF territory irrespective of cancer), surgery, A/C chemo maybe, bit of high blood pressure. I was also virtually asymptomatic - without the good monitoring, I would probably not have known for months. Long story short, I take beta blockers which are very effective at stopping any tachycardia (haven’t had any in years) and blood thinners to guard against any clotting. My heart rate remains normal, my blood pressure is normal, my irregularity is now very close to the ‘regular irregularity’ I had for decades before cancer. Blood thinners are also really good for DVT protection on long overseas air travel (if we ever get to do that again!). I live a normal life and am now seven years NED. I don’t know how much I owe to my treatment and how much to good luck, but a few pills seem a very low price for the years I might never have had. Never regret your good care for yourself, it sets a pattern that is even more useful now. Best wishes.