Q:

A 60 year old lady has severe chest pain. ECG shows changes of inferior wall MI. ECG also shows progressive prolongation of PR interval until a QRS complex is dropped. What is the most probable diagnosis?

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A 60 year old lady has severe chest pain. ECG shows changes of inferior wall MI. ECG also shows progressive prolongation of PR interval until a QRS complex is dropped. What is the most probable diagnosis?


  1. Atrial fibrillation
  2. VT
  3. SVT
  4. Mobitz type I 2nd degree heart block
  5. Mobitz type II 2nd degree heart block

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The key is D. Mobitz type I 2nd degree heart block. [Inferior MI is frequently associated with conduction defect].

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