What is your preferred method for subclinical CAD screening prior to initiation of class IA antiarrhythmic drugs for atrial fibrillation?

This is a somewhat unique question in that I rarely use IA agents for atrial fibrillation. In my training and early practice, they were used but not so recently. I believe oral procainamide is not readily available, though the IV form is. Quinidine doesn't have a great efficacy adverse event ratio a...