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| USMLE Step 2 CK Forum USMLE Step 2 CK Discussion Forum: Let's talk about anything related to USMLE Step 2 CK exam |
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#2
07-31-2012
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by looking at the ECG
Type 1: Progressive lengthening of the PR interval until a ventricular beat is dropped (missing QRS). This one usually has a 2:1 or 3:1 ratio. Depending on the severity of the symptoms a pacemaker MIGHT be required. Type 2: Normal PR interval throughout, but ventricular beats are dropped randomly (randomly missing QRS). There is no ratio here, beats can be dropped anytime. Pacemaker DEFINITELY required regardless of severity of symptoms otherwise this will eventually lead to third degree block (complete block). 
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Dr.Lacune (07-31-2012) | ||
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