Can High Heart-rates Of 147 Cause Any Issues?
I would recommend as follows:
Welcome and thank you for asking on HealthcareMagic!
Regarding your concern, I would explain that the main problem with high heart rates during atrial fibrillation is hemodynamic alterations with low blood pressure and fainting.
So, it is better to treat those episodes as soon as possible, in order to avoid possible complications.
In this regard, a beta blocker (like Metoprolol, as they've already administered) or a calcium channel blocker (Verapamil, Diltiazem) would help treat and prevent tachycardia.
If tachycardia persists, increasing the dose of metoprolol would be necessary.
You should discuss with your attending physician on these issues.
Hope you will find this answer helpful!
If you have any other questions, please don't hesitate to ask again!