Idiopathic left ventricular tachycardia in children.
BACKGROUND
Idiopathic left ventricular tachycardia (ILVT) is a rare but well-recognized clinical entity. The clinical characteristics and prognosis of this form of ventricular tachycardia (VT) in Thai children is not known.


OBJECTIVE
To define clinical presentations, drug therapies, roles of radiofrequency (RF) catheter ablation, and the short-term outcome of these children in Thailand.


METHODS
From April 1999 to June 2007, 10 patients were diagnosed as ILVT by specific electrocardiographic features and therapeutic response. All patients had a structurally normal heart. Data were collected retrospectively. Baseline clinical information, 12-lead electrocardiography (ECG) during VT, responses to drug therapy, results of RF catheter ablation therapy, and outcome were determined.


RESULTS
Median age at presentation was 9.5 years (range, 3.8 to 14.0 years). Three patients (30%) were male. Eight patients (80%) were diagnosed as supraventricular tachycardia (SVT) before ILVT diagnosis. Median duration from SVT diagnosis to the correct diagnosis was 1.5 years (range, 0 to 6.0 years). Palpitation and chest pain were usual clinical manifestations while congestive heart failure was the presentation in one due to incessant tachycardia. Two patients had recurrent VT episodes during acute febrile illnesses. The majority of patients responded to intravenous verapamil. RF catheter ablation was performed in 3 patients with recurrence of the VT in one.


CONCLUSIONS
Prompt recognition of the ILVTespecially in the emergency department is very important. Verapamil is effective for acute termination as well as prevention of VT recurrence. When VT is refractory to medical therapy, RF catheter ablation is safe and effective. The short-term prognosis was good.
Suesaowalak
Monnipa
M
Division of Cardiology, Department of Pediatrics, Faculty of Medicine, King Chulalongkorn Memorial Hospital, Bangkok, Thailand.
Khongphatthanayothin
Apichai
A
Sunsaneewttayakul
Buncha
B
Sirisopikun
Tosaporn
T
Promphan
Worakan
W
Jariyapongpaiboon
Yaowalak
Y
Sitthisook
Surapun
S
D000293:Adolescent; D000889:Anti-Arrhythmia Agents / Q000627:therapeutic use; D017115:Catheter Ablation; D002648:Child; D002675:Child, Preschool; D005260:Female; D006352:Heart Ventricles / Q000187:drug effects* / Q000473:pathology; D006801:Humans; D008297:Male; D011379:Prognosis; D012189:Retrospective Studies; D017180:Tachycardia, Ventricular / Q000188:drug therapy / Q000453:epidemiology* / Q000628:therapy; D013785:Thailand / Q000453:epidemiology; D018487:Ventricular Dysfunction, Left / Q000188:drug therapy / Q000453:epidemiology* / Q000628:therapy; D014700:Verapamil / Q000627:therapeutic use
D000889:Anti-Arrhythmia Agents; D014700:Verapamil