Risk stratification in individuals with the Brugada type 1 ECG pattern without previous cardiac arrest: usefulness of a combined clinical and electrophysiologic approach.
OBJECTIVE
Risk stratification in individuals with type 1 Brugada electrocardiogram (ECG) pattern (type 1 ECG) for primary prevention of sudden death (SD).


RESULTS
Three hundred and twenty patients (258 males, median age 43 years) with type 1 ECG were enrolled. No patient had previous cardiac arrest. Fifty-four per cent of patients had a spontaneous and 46% a drug-induced type 1 ECG. One-third had syncope, two-thirds were asymptomatic. Two hundred and forty-five patients underwent electrophysiologic study (EPS) and 110 patients received an implantable cardiac defibrillator (ICD). During follow-up [median length 40 months (IQ20-67)], 17 patients had major arrhythmic events (MAE) (14 resuscitated ventricular fibrillation (VF) and three SD). Both a spontaneous type 1 ECG and syncope significantly increased the risk (2.6 and 3.0% event rate per year vs. 0.4 and 0.8%). Major arrhythmic events occurred in 14% of subjects with positive EPS, in no subjects with negative EPS and in 5.3% of subjects without EPS. All MAE occurred in subjects who had at least two potential risk factors (syncope, family history of SD, and positive EPS). Among these patients, those with spontaneous type 1 ECG had a 30% event rate.


CONCLUSIONS
(1) In subjects with the Brugada type 1 ECG, no single clinical risk factor, nor EPS alone, is able to identify subjects at highest risk; (2) a multiparametric approach (including syncope, family history of SD, and positive EPS) helps to identify populations at highest risk; (3) subjects at highest risk are those with a spontaneous type 1 ECG and at least two risk factors; (4) the remainder are at low risk.
Department of Cardiology, General Hospital of Conegliano, Via Brigata Bisagno 4, Conegliano, Treviso, Italy. alloccag75@libero.it
Pietro
P
Delise
Giuseppe
G
Allocca
Elena
E
Marras
Carla
C
Giustetto
Fiorenzo
F
Gaita
Luigi
L
Sciarra
Leonardo
L
Calo
Alessandro
A
Proclemer
Marta
M
Marziali
Luca
L
Rebellato
Giuseppe
G
Berton
Leonardo
L
Coro
Nadir
N
Sitta
D000328:Adult; D053840:Brugada Syndrome / Q000175:diagnosis* / Q000235:genetics / Q000628:therapy; D016757:Death, Sudden, Cardiac / Q000517:prevention & control*; D017147:Defibrillators, Implantable; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D006323:Heart Arrest / Q000235:genetics / Q000517:prevention & control*; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D011446:Prospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D013575:Syncope / Q000209:etiology; D016896:Treatment Outcome; D014693:Ventricular Fibrillation / Q000209:etiology