March 5, 2017

Intermittent preexcitation, QRS alternans or intermittent AV Dissociation?


A pt s/p spine surgery. 

 This is: 
a. Intermittent preexcitation
b. Intermittent AV dissociation
c. QRS alternans

Image 1 - ECG case
Answer: B. Sinus rhythm (~90 bpm) with premature junctional complexes creating intermittent AV dissociation

Image 2 - Ladder diagram
#499
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2 comments:

  1. ECG InterpretationMarch 6, 2017 at 2:08 AM

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  2. ECG InterpretationMarch 6, 2017 at 2:10 AM

    SUPERB tracing! For those who are interested — another rhythm strip on this same patient is equally fascinating — https://learningecg.blogspot.com/2015/10/several-tricks-of-pjc-on-one-strip.html — Please see my Comments at that site — :)

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