Page 136 - ECG dr shamol_Slide

Wide QRS ≥0.12 second
A secondary R wave (R′) in V1 or V2 (i.e., an rSR′, rsR′, or rsr′ complex hat often

is M-shaped).

The secondary R wave (R′) is usually taller than he initial R wave
A wide, slurred S wave in leads V5, V6, and I with duration >40 ms;

the S wave is longer in duration (length) than the preceding R wave in leads

V6 and I

The axis may be normal, right, or left. If left axis is present, consider left
anterior fascicular block (hemiblock) (see Chapter 9).