This ECG was recorded from a 75-year-old man with substernal chest pain and diaphoresis. It shows a pretty classic picture of acute inferior wall M.I. The second ECG is a repeat tracing with the V4 wire moved to the V4 Right position, and it is positive for right ventricular M.I. The patient was found to have a 100% occlusion of the right coronary artery, which was opened and stented in the cath lab.
Type I AV block
This ECG is from an 80-year-old woman who had an acute inferior wall M.I. with a second-degree AV block.
Some people incorrectly call ALL second-degree AV blocks that are conducting 2:1 "Type II". This is incorrect, as Mobitz Type I can also conduct with a 2:1 ratio. The progressive prolongation of the PR interval will not be seen with a 2:1 conduction ratio, because there are not two PR intervals in a row.
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