63 year old female patient monitored during mitral valve replacement. Patient has a history of smoking, hypertension, and coronary artery disease.
Rhythm analysis indicates normal sinus rhythm (NSR), with a left bundle branch block.
This encounter shows normal sinus rhythm (NSR) with P waves and a regular rhythm. The QRS is wider than 120 milliseconds, leading to a further investigation of conduction blocks. The QRS to the left of the J point in lead V1 is negative, making this a left bundle branch block.
Source: PhysioNet MGH065