Ventricular tachycardia in children without heart disease.

To assess the natural history of ventricular tachycardia (VT) in children without heart disease, the clinical course of 26 children, aged 1 day to 15 years at initial detection, was reviewed. Symptoms related to the rhythm were present in 8 children at some time during their course of follow-up. Evaluation included echocardiogram (19 patients), Holter monitoring (22 patients), graded treadmill exercise testing (16 patients) and invasive electrophysiology (4 patients). Exercise induced or exacerbated VT in 9 patients, but suppressed rhythm in 7. Ten patients were never treated. Of the remaining 16 treated patients, therapy was discontinued in 10 on the basis of the electrocardiographic or Holter monitor recordings. Six continued to receive therapy without complications. There were no known deaths over a period of 1 month to 34 years (mean 59 months, median 42 months). Although 2 patients have been lost to follow-up, based on our findings and a review of the reported cases of VT in children to date, after undergoing complete noninvasive cardiac evaluation symptomatic patients should be treated and studied with invasive electrophysiology if antiarrhythmic control is inadequate. The rate of VT or age at onset are not predictive of outcome in asymptomatic patients. As a group, these patients do not appear to benefit from therapy, but warrant follow-up since deaths have been reported in untreated asymptomatic patients.