QRS duration | ≥0.12 sec |
Intrinsicoid deflection | >0.035 in V1 and V2 due to delayed R' |
Common pattern: Posterior mid-temporal forces | qRS or qrS in I, V6; rsR' or qR in V1 - Reflects anterior initial forces, anterior and rightward terminal forces |
Atypical pattern: Anterior mid-temporal forces | qRS, qrS, or RS in I, V6; rsR' or qR in V1 - Reflects anterior mid-temporal right ventricular enlargement and left anterior fascicular block |
ST-T waves | ST depression and T inversion in right precordial leads, upright in left precordial and limb leads - ST-T vectors are discordant to terminal mean QRS spatial vector |
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