Widened QRS complexes (>0.12 seconds) with a right bundle branch block pattern indicate delayed conduction through the right ventricle. This occurs when the right bundle branch is damaged or blocked, forcing electrical activation to reach the right ventricle through alternative pathways.
임상 시나리오
QRS Complex Characteristics:
- Normal QRS duration: 0.08-0.12 seconds
- Widened QRS: >0.12 seconds
- RBBB criteria: QRS >0.12s, RSR' in V1-V2, Wide S wave in I and V6
- LBBB criteria: QRS >0.12s, Broad R wave in I, V5-V6, QS or rS in V1
- Causes of wide QRS:
* Bundle branch blocks
* Ventricular rhythms
* Hyperkalemia
* Sodium channel blockade
- ECG measurements:
* PR interval: 0.12-0.20s
* QT interval:
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