Use of a cardioselective beta-blocker for pediatric patients with prolonged QT syndrome.
The data on the efficacy of atenolol for long-QT syndrome (LQTS) are controversial. This study aimed to evaluate the efficacy of atenolol for pediatric patients with LQTS. A retrospective observational study investigating all patients who had LQTS treated with atenolol at two institutions was performed. The study identified 57 patients (23 boys and 34 girls) with a mean QT corrected for heart rate (QTc) of 521 ± 54 ms. The mean age of these patients at diagnosis was 9 ± 6 years. Their clinical manifestations included no symptoms (n = 33, 58%), ventricular tachycardia (n = 10, 18%), syncope (n = 6, 10%), resuscitated sudden cardiac death (n = 4, 7%), atrioventricular block (n = 2, 4%), and bradycardia or presyncope (n = 2, 3%). Of the 57 patients, 13 (22%) had a family history of sudden death. The follow-up period was 5.4 ± 4.5 years. Atenolol at a mean dose of 1.4 ± 0.5 mg/kg/day was administered twice a day for all the patients. The mean maximum heart rate was 132 ± 27 bpm on Holter monitors and 155 ± 16 bpm on exercise treadmill tests, with medication doses titrated up to achieve a maximum heart rate lower than 150 bpm on both tests. During the follow-up period, one patient died (noncompliant with atenolol at the time of death), and the remaining patients had no sudden cardiac death events. Four patients (8%) had recurrent ventricular arrhythmias, three of whom received an implantable cardioverter defibrillator (all symptomatic at the time of diagnosis). For three patients (6%), it was necessary to rotate to a different beta-blocker because of side effects or inadequate heart rate control. Atenolol administered twice daily constitutes a valid and effective alternative for the treatment of pediatric patients with LQTS.
Moltedo
Jose M
JM
Section of Pediatric Cardiology, Fundacion contra las enfermedades Neurologicas de la Infancia, Buenos Aires, Argentina. jmoltedo@intramed.net
Kim
Jeffrey J
JJ
Friedman
Richard A
RA
Kertesz
Naomi J
NJ
Cannon
Bryan C
BC
D000293:Adolescent; D058671:Adrenergic beta-1 Receptor Antagonists / Q000008:administration & dosage*; D001262:Atenolol / Q000008:administration & dosage*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006339:Heart Rate / Q000187:drug effects*; D006801:Humans; D008133:Long QT Syndrome / Q000188:drug therapy*; D008297:Male; D012189:Retrospective Studies; D016896:Treatment Outcome
D058671:Adrenergic beta-1 Receptor Antagonists; D001262:Atenolol