16. Choice D is the correct answer. A new onset left bundle branch block with chest pain is a STEMI until proven otherwise. Defibrillation is only appropriate for ventricular tachycardia, ventricular fibrillation, and unstable narrow complex tachycardia. Pacer is appropriate for sick sinus syndrome and third degree AV block. This is not an RSR' pattern seen with pulmonary embolus.
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