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NBME Step 2 CK Free 120 Answers

step2ck_free120/Block 2/Question#80 (reveal difficulty score)
A 67-year-old man is brought to the emergency ...
Mobitz type II (second-degree) atrioventricular block ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
tags: cardio ecg

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submitted by โˆ—bwdc(697)
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There is AV concordance (all QRS have a preceding P wave), but we have intermittent dropped beats consistent with a second degree AV block. The PR-interval of the conducted beats is always the same, so we have Mobitz 2. Progressively lengthening PR-interval prior to a dropped QRS is Mobitz 1 (Wenkebach).

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azibird  If you look closely at the first group of three in V1, the PR interval is definitely lengthening. I must have been overreading and this was too subtle to make it type I. Annoying +

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