An expert committee of the World Health Organization (WHO) listed electrocardiographic criteria for right ventricular hypertrophy.
Criteria for right ventricular hypertrophy:
(1) qR pattern with intrinsicoid deflection > 0.03 seconds (30 ms) in V1
(2) 2 or more of the following:
(2a) R amplitude less than S amplitude in V5
(2b) R or R' amplitude less than S amplitude in I
(2c) incomplete right bundle branch block (RBBB) with QRS duration < 0.12 seconds (120 ms)
Additional supportive features:
(1) P amplitude >= 0.25 mm in II
(2) extreme right axis deviation >= 110°
(3) T wave inversion in leads V1 to V4 (may be transitory)
(4) T wave inversion in leads II and III (may be transitory)
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