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Table 2 Summaries of electrocardiogram characteristics of the different origins

From: Origins location of the outflow tract ventricular arrhythmias exhibiting qrS pattern or QS pattern with a notch on the descending limb in lead V1

Origin Number QRS pattern in leads V1 Transition zone leads V2 R wave Duration index > 50% and R/S amplitude ratio > 30% Transition index QRS pattern in leads I
qrS QS ≤V3 >V3 yes no <0 ≥0 R、r、m or Rs rs or qr
RVOT 26 20 6 10 16 3 23 1 25 16 10
LVOT 23 17 6 20a 3 18 5 22 a 1 19 4
LCC 4 / 4 3 1 3 1 4 / 1 3
L-RCC 16 14 2 15 1 13 3 15 1 15 1
RCC 2 2 / 1 1 1 1 2 / 2 /
ILCC 1 0/1 / 1 / 1 / 1 / 1 /
  1. Annotation: compared with RVOT, a p < .001.