ECG assessment
For each patient, ECG with baseline preexcitation and/or ECG with full
preexcitation were analysed (per availability). Full preexcitation ECG
pattern was obtained during electrophysiological study via incremental
atrial pacing, programmed atrial pacing or adenosine administration. QRS
polarity/type was coded as one of the six following categories:
completely positive (monophasic R) without notches, completely positive
(R) with notches (notch/plateau at the top of monophasic R wave),
predominantly positive (Rs, Rsr’, qR etc.), equiphasic (RS, QRS, RSR’,
etc.), predominantly negative (Qr, rS, rSr’, etc.) or completely
negative (QS) - depending on the dominant polarity. Examples of QRS
categories are presented in Figure 2 and inside the application
next to each question. Most representative full preexcitation patterns
for the 19 regions are illustrated in Figure 3 and
Supplementary Figures 1-2 .