You are right, bisoporol is supposed to drop your heart rate as I understand it, my husband has dialated cardiomyopathy or heart failure, caused by a virus the Dr's believe, but nothing proven.
His Ejection fraction was as low as 23%, 7 years ago, then about 2 years ago with Ejection fraction was about 35%, his pulse was at 30BPM, at home, took him to the heart hospital, where they said it was his tablets that were causing the problem, took him off his tablets, and his heart rate dropped to 23BPM, at that point, they called the hospital flying team in.
I saw the consultant a couple of hours later, and told him his junior staff were idiots in no uncertain terms, 30BPM, is not a pinched nerve in your neck and nor is it caused by heart tablets as proven only too well, consultant agreed with me, he told me so.
Pacemaker installed finally 36 hours after we presented at the heart hospital, he immediately felt better, told us all he could breathe, I was in the recovery area, and would you believe his slow urine flow resolved itself within half and hour of the pacemaker being switched on.
His Ejection fraction last week was back to 56%, which is in the normal range, apparently his dialated cardiomyopathy appears to have resolved itself.
Have since been told that he has 100% branch bundle block, after having left sided branch bundle block for many years possibly, so the left side of his heart was not beating in rhythum with the right side of his heart but slightly off.
Also interesting is that he is one of the lucky few that does not have plaque in his arteries, as first thought might be the cause of his heart failure, angiogram seemed to stun the Dr's, and still does when we bring it up with a new junior cardiologist, they have to dig in the file, but they eventually find the report telling them he is a little different to regular patients.