Right bundle branch block (RBBB) can be identified by changes in the electrocardiogram (ECG).


Features of RBBB:

(1) duration of QRS >= 0.12 seconds (120 milliseconds) with slurring in the middle to late portions

(2) V1 and/or V2 show a secondary R wave (R') with ST segment depression and T wave inversion

(3) V5 and V6 show wide slurring of the S wave

(4) lead I shows wide slurring of the S wave


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