Lead I R-wave amplitude to differentiate idiopathic ventricular arrhythmias with left bundle branch block right inferior axis originating from the left versus right ventricular outflow tract.
Shuanglun XieMaciej KubalaJackson Jeikai LiangTatsuya HayashiJaeseok ParkIrene Lucena PadrosFermin C GarciaPasquale SantangeliGregory E SuppleDavid S FrankelErica S ZadoDavid LinRobert D SchallerSanjay DixitDavid J CallansSaman NazarianFrancis E MarchlinskiPublished in: Journal of cardiovascular electrophysiology (2018)
The presence of R-wave amplitude in lead I (≥0.1 mV) is a simple and useful criterion to identify LVOT cusp or endocardium focus in LBRI arrhythmias. A QS pattern in lead I suggests an origin in the anterior RVOT, or less commonly the adjacent LV summit.