Mobitz Type II Etiology question

[jayel]

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My Kaplan instructor told us today that both Mobitz type I and II are due to AV node abnormalities. I just did a usmle-rx question that said Mobitz type I is due to an AV node abnormality which was expected, but it also said Mobitz type II is due to a bundle of His or Purkinje fiber abnormality.

Who is right and what does the usmle say it is? Thanks

 

[ChessMaster3000]

My Kaplan instructor told us today that both Mobitz type I and II are due to AV node abnormalities. I just did a usmle-rx question that said Mobitz type I is due to an AV node abnormality which was expected, but it also said Mobitz type II is due to a bundle of His or Purkinje fiber abnormality.

Who is right and what does the usmle say it is? Thanks

usmlerx is correct. mobitz II would be bundle of His--less likely purkinje fibers

 

[BurberryDoc]

Agree w/ChessMaster3000. Mobitz is AV, and Mobitz-2 is his-BUNDLE.


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[Myxedema]

Is it possible your instructor said both are AV blocks, rather than AV nodal blocks?