ECG changes in right bundle branch block (RBBB)
Right bundle branch block is best seen in V1 where there is an RSR (M-shaped) pattern.
- QRS duration greater than 120ms RSR
- generally dominant R in V1
- inverted T waves V1-3 or V4
- wide and deep S in V6
Click here for example of ECG of RBBB
Reference
- Surawicz B et al. American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology. American College of Cardiology Foundation. Heart Rhythm Society. AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part III: intraventricular conduction disturbances: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society. Endorsed by the International Society for Computerized Electrocardiology. J Am Coll Cardiol. 2009 Mar 17;53(11):976-81
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