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Right ventricular hypertrophy

Right ventricular hypertrophy [*]

• ECG is insensitive
• ECG criteria require QRS duration less than 0.12 s
1. Right axis deviation of +110° or more
2. Dominant R wave in lead V1 (R/S ratio > 1)
3. R wave in lead V1 7 mm
• Supporting ECG criteria
1. ST segment depression and T wave inversion in leads V1 to V4
2. Deep S waves in leads V5, V6, I, and aVL
• Other causes of tall R wave in V1
1. Posterior myocardial infarction
2. Type A Wolff-Parkinson-White syndrome
3. Right bundle branch block
4. Some normal children and young adults
• Other causes of right axis deviation
1. Left posterior hemiblock
2. Lateral myocardial infarction
3. Acute right heart strain
4. Normal in infants and children