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This cardiogram shows sinus rhythm with a normal pr interval and a prolonged QRS interval (>120ms). There is a conduction abnormality best described as a right bundle branch block due to the rsR' wave in V1. Note the S wave in V6 which is due to the RBBB is smaller than the R wave in V6. The axis of the QRS is difficult to determine, but one usually looks at the first 60 ms. (1 1/2 small squares) to determine the axis with a RBBB. If the axis of the first 60 ms. of the QRS is more than 90 degrees and there is an rS in lead I and a Q in lead III then on would consider a left posterior fasicular block. This is not the case here.


Case reports by Michael Rosengarten


EKG World Encyclopedia , courtesy of Michael Rosengarten BEng, MD.McGill




Michael Rosengarten BEng, MD.McGill


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current06:10, 10 February 2012Thumbnail for version as of 06:10, 10 February 20122,644 × 1,599 (3.41 MB)DarrelC (talk | contribs)
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