close
LVH :
* Voltage criteria : S wave depth in V1 + Tallest R wave height in V5-V6 > 35 mm
* Combined with LAE, LAD
* STE in the right precordial leads V1-3 (discordant to the deep S waves).
* LV strain pattern : STD and Tinv in the lateral leads
STE in LVH :
- STE should be in V2-3
- Appropriate discordant
- Preceded by large voltage S
- Ratio ST/S < 0.25
RVH :
* Combined with RAE, RAD
* Dominant R in V1 (> 7mm tall or R/S ratio > 1)
* Dominant S in V5 or V6 (> 7mm deep or R/S ratio < 1)
* RV Strain pattern : STD / Tinv in V1-4 and inferior (II, III, aVF) leads
RBBB :
* Broad QRS > 120 ms
* RSR’ pattern in V1-3 (‘M-shaped’ QRS complex)
* Wide, slurred S wave in the lateral leads (I, aVL, V5-6)
* STD and T inv in V1-3
* Incomplete RBBB : RSR’ pattern in V1-3 with QRS < 120ms
LBBB :
* QRS duration of > 120 ms
* Dominant S in V1
* Broad monophasic R wave in lateral leads (I, aVL, V5-V6)
* Absence of Q waves in lateral leads (I, V5-V6; small Q waves are still allowed in aVL)
* Prolonged R wave peak time > 60ms in left precordial leads (V5-6)
Associated Features
-
Appropriate discordance:the ST and T always go in the opposite direction to the main vector of the QRS
-
Poor R wave progression in the chest leads
-
LAD
全站熱搜
留言列表
CV (7)
