Table 1.

Clinical baseline characteristics

	Total group (n = 20)
Age, years	39±12
Gender, male	11 (55)
Family history of SCD in first-degree relatives	8 (40)
History of atrial flutter at age <35 years	1 (5)
Symptoms
Palpitations	11 (55)
Syncope	9 (45)
Near syncope	4 (20)
Systemic systolic ventricular function
Normal left ventricular ejection fraction (≥55%)	20 (100)
Genetic variance
No (likely) pathogenic SCN5A variant	14 (70)
No genetic testing	4 (20)
Pathogenic SCN5A variant	2 (10)
Clinical presentation
Ajmaline induced Brugada ECG	14 (70)
Fever induced Brugada ECG	4 (20)
Spontaneous Brugada ECG	2 (10)
Electrocardiography
Sinus rhythm	20 (100)
PR interval, ms	169±28
QRS duration, ms	103±18
QTc duration, ms	391±22
Fragmented QRS	4 (20)
EP study	7 (35)
No inducible sustained VA	7 (35)
VERP <200 ms	2 (10)
Holter monitoring	16 (80)
No PVCs	10 (50)
≤1% PVCs	6 (30)
Supraventricular tachycardia	0
Ventricular tachycardia	0
SA-ECG	16 (80)
Late potentials	10 (50)

Data are presented as n (%) or mean ± standard deviation. ECG, electrocardiogram; EP, electrophysiological; PVC, premature ventricular arrhythmia; SCD, sudden cardiac death; VA, ventricular arrhythmia; VERP, ventricular effective refractory period.