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a. Bundle branch blocks. i. QRS complex with a bizarre appearance and a duration of longer than 120 ms. ii. Most common findings on the 12-lead ECG. iii. Right bundle branch blocks (RBBB): Terminal R wave in lead V1 (a) Typically, the QRS complex appears as an rSR' complex (R-prime wave). (b) Terminal S waves are also seen in leads I, aVL, and ... ................
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