Feature

Left ventricular hypertrophy

Right ventricular hypertrophy

R-wave and S-wave amplitudes

Increased R-wave or S-wave amplitude:

– R wave >26 mm in V5 or V6

– R wave >11 mm in aVL

– S wave in V1 + R wave in V5(6) >35 mm

– S wave in V3 + R wave in aVL >28 mm in men, >20 mm in women

Increased R-wave amplitude in V1 and aVR:

– R wave ≥7 mm in V1

– R wave ≥5 mm in aVR

– R wave >S wave in V1

ST segments

Downsloping depression

Downsloping depression

T waves

Negative or biphasic in V5-V6

Negative or biphasic in V1-V2

Electrical axis of the heart

Normal (less often left axis deviation)

Right axis deviation >110 degrees