I have Left Branch Bundle Block, have been told several times I cannot take Beta Blockers because of it. My cardiologist (a very reputable cardiologist) has prescribed Metoprolol. I questioned this and he said because it's low dose it's ok. I feel uneasy about taking it but don't want to be labeled a "non-compliant" patient. Was recently prescribed another med for AFIB by cardiologist, but when I later saw a cardiac Electrophysiologist he said none of the many tests I've had indicate AFIB. How do we know who knows what???