Case: A 49-year-old man with no past medical history presents to the ED with palpitations for five days. He feels tired and a little short of breath but has no chest pain. His vital signs are normal except for a heart rate of 142 beats per minute (bpm). You palpate his pulse and find it irregularly irregular. An ECG confirms rapid atrial fibrillation.
Question: In patients with rapid atrial fibrillation, what medication will obtain rate control faster: a beta blocker or a calcium channel blocker?