June 7, 2010
The normal p wave is often seen notched, which is likely caused by slightly asynchrony between depolarization of the right and left atrium. However in left atrial enlargement the notched, or bifid, p wave is often marked, in particular in lead II and lead V1, which is where to check for atrial abnormalities [...]
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June 6, 2010
Trifascicular block is seen on the ECG as a combination of a fascicular block (hemiblock), right bundle branch block (RBBB) and first degree av block. This ECG pattern results (but not always) from a combination of right bundle branch block and block of the two fascicles of the left bundle branch (hence the term trifascicular), however with one of these three blocks being incomplete [...]
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