When would you consider PPM implantation for intermittent episodes of high-degree AVB that persist following a successful PCI in a patient presenting with an inferior STEMI?  

AV block that occurs with an inferior STEMI is not usually caused by interruption of the distal conduction system and is often reversible. The key term in the question is "persistent." How long after the MI has AV block been observed, what is the heart rate, and is the escape rhythm wide or narrow? ...