GoodGirl
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Looks easy but for some reason I got this wrong, can anybody answer this Q ?
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| acintya
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Is it B: Defects in the His-Purkinje system?
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| GoodGirl
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You are right.  Why not AV nodal abnormality? Could it be too?
I guess need to go back to the topic. 
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| GoodGirl
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Why Kaplan mentions Mobitz II with AVNode ? 
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| acintya
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AV block means a conduction block between the atria and the ventricles.
First degree AV block--> there is a problem with the AVN itself and it conducts the electrical impulse slower, and we see Prolonged PR interval.
Second degree AV block
TYPE 1--> progressively prolonged PR intervals (in this question PR interval remains constant) along with dropped QRS complex.
TYPE II (Mobitz) --> PR interval will be constant (because the atria are contracting rhythmically) but then there will be an unexpected sudden loss of atrio-ventricular conduction; that shows up as dropped QRS complex, and is most commonly due to an Infra nodal delay--> Bundle of His
Yeah, for ECG, I had to look up emedicine and Guyton. Kaplan does not have too much detail. Thanks for the question, so I could refresh and strengthen my CVS Pharm 
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| GoodGirl
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Thank you Acintya for shedding the light, hope at the exam I will be able to answer right. Kaplan is very weak and confusing at this topic.
Here is attached answer from Rx.
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| unique1
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Dr.Dunn says that it is highly unlikely that they will test abnormal ECG on step 1 and you have choice to even skip this topic. I wonder if it is true ?
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| new_n_lost
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unique1 wrote:
Dr.Dunn says that it is highly unlikely that they will test abnormal ECG on step 1 and you have choice to even skip this topic. I wonder if it is true ?
Trust me Unique they have started doing the unlikely things that we know r rare. I had a couple of Questions very similiar.
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| paheli
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HA!! what do you know, i fell for it, and picked A. i might have some knee-jerk typre reflexes to trip on the distractors.
thanks for the excellent explanation, acintya. and thanks for the excellent qn, GG..
and, guys, let's not take anything for granted on this test, ok. i'm beginning to get convinced that it's EVIL!!
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| unique1
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Thanks NnL.
GG, thanks for putting this q here .
Acintya, I second Paheli, you have explained it very nicely. It shows your grasp on the subject.
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| acintya
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Thanks gals well I just finished Physio, so I can remember....hopefully now this discussion will make it stick better
GG, please continue posting some more!!
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| GoodGirl
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Glad we were able to discussed it. 
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| ShweHope99.9998
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 seriously , have to open latest book with full a to z deatail reading to review the EKG , seriously if will ask detail like that . Where's the time
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