Cardiac CTA's anyone using esmolol or amiodarone?

I work in an outpatient cardiology clinic with a Ct scanner. We are currently using metoprolol for rate control. Some of the Dr's talked about trying esmolol because of the 9min 1/2 life. Another Dr said in other OP centers they use amiodarone. I would like to hear from anyone doing this and what their protocols are. I could imagine that their bloodpressure does not do well with these drugs and it would be more profound than metoprolol. Of course our pt population is 70% elderly with already compensated hearts and they are on a lot of oral meds. Any experiences?