I was advised to stop the 25 mg of metoprolol I'd been on for 4 years for svts, because my pulse was getting too low and my ECG was showing heart block. They wanted me off of it for 1 week and then come in for another ECG to see if it was the drug causing the heart block. But, what happened is my BP went through the roof and I felt really really awful. Perhaps it was non stop SVTs. I don't know since I'd been someone who did not feel the SVTs. I was immediately started on Losartan for the high BP.
I then wore a Holter monitor for 24 hours which showed second degree AV heart block and 3 months after that I had a duel chamber Pacemaker.