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Bundle branch block

Right Bundle Branch Block

Tue, 11/12/2013 - 14:03 -- Dawn

This ECG shows a normal sinus rhythm at 73/min. and a right bundle branch block.  The diagnostic characteristics of RBBB are:  wide QRS (greater than .12 sec.), supraventricular rhythm (in this case NSR), and an rSR' pattern in V1 with a small, wide S wave in Leads I and V6.  The R' and small s waves represent the right ventricle depolarizing slightly AFTER the left ventricle.  In fact, in RBBB, each lead should look pretty normal at first, with a terminal right ventricular depolarization wave added to each QRS complex.

Right Bundle Branch Block

Sat, 11/03/2012 - 00:06 -- Dawn

This ECG is from a healthy young man in his 20's.  He was born with a ventricular septal defect (VSD) that was surgically repaired when he was a toddler.  He now has a right bundle branch block, which could be a result of the defect, or the surgery.  This is a good ECG for the Instructors' Collection because it clearly shows all the ECG characteristics of right bundle branch block:  wide QRS in a supraventricular rhythm (in this case, NSR), rSR' pattern in V1, wide or "slurred" S waves in Leads I and V6.  There is no rhythm strip below the 12 leads in this ECG, but

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