Table 2

Electrophysiological Characteristics of 191 Patients With BrS Stratified by Clinical Presentation

Group 1 (n = 88)Group 2 (n = 103)p Value
VF (n = 51)VT (n = 37)
Baseline substrate size, cm20.013
 Median7.05.73.2
 IQR2.4–12.01.4–9.41.1–7.2
 Min-max0–56.60.2–23.90–17.4
Substrate size after ajmaline, cm2
 >200 ms<0.001
  Median18.916.015.1
  IQR15.4–22.413.0–22.411.0–18.5
  Min-max5.8–64.27.6–36.63.2–51
 >250 ms0.003
  Median10.08.06.9
  IQR7.1–11.64.7–10.74.1–9.1
  Min-max0.2–35.01.3–16.00.4–23.5
 >280 ms<0.001
  Median6.04.73.0
  IQR3.6–7.21.2–7.01.0–5.2
  Min-max0–22.10–12.30–12.5
Baseline potential duration, ms<0.001
 Median230190167
 IQR192–233156–221150–222
 Min-max129–310124–310123–325
Potential duration after ajmaline, ms<0.001
 Median330315300
 IQR310–333295–330260–320
 Min-max219–423226–405219–480
Baseline local activation time, ms0.006
 Median716575
 IQR64–7662–7666–81
 Min-max59–8453–8353–89
Local activation time after ajmaline, ms0.003
 Median827885
 IQR78–8773–8978–94
 Min-max70–9668–9568–103
Baseline low-voltage area, cm2<0.001
 Median100
 IQR0–50–00–0
 Min-max0–130–10–2
Low-voltage area after ajmaline, cm2<0.001
 Median200
 IQR0–80–00–0
 Min-max0–210–20–4

IQR = interquartile range; other abbreviations as in Table 1.