Problem: A 70-year-old patient with a history of hypertension is admitted for evaluation of dizziness and near-syncope. The ECG shows a prolonged PR interval with otherwise regular rhythm. The PR interval on an ECG represents [select the letter from options in #1], and in this patient, the finding is most consistent with [select the letter from option in #2]. Drop-Down Options for First #1: a. conduction from atria through the AV node b. repolarization of the ventricles c. initiation of the sinus node impulse d. mechanical contraction of the atria Drop-Down Options for Second #2: e. left bundle branch block f. premature atrial contraction g. first-degree atrioventricular block h. supraventricular tachycardia. Need Assignment Help?