Time course of appearance of markers of arrhythmia in patients with tetralogy of Fallot before and after surgery.

Abstract:

:Sudden death and ventricular tachycardia are known to occur late after correction of tetralogy of Fallot. Abnormal dispersion of the QT interval, ventricular late potentials, and prolongation of the QRS complex, alone or in combination, are useful markers of the risk for such complications. Our present prospective study investigates the time course of appearance of two markers, dispersion of QT and JT, and ventricular late potentials, before and after corrective surgery. Dispersion of QT and JT, and signal averaged electrocardiographic parameters, were determined sequentially in 20 patients before, a mean of 9 +/- 3 days after, and again 35 +/- 11 days post-operatively. Dispersion of QT was already abnormal before surgery in two-fifths of the patients, but increased markedly in the later post-operative period. Ventricular late potentials were absent before surgery and in the immediate post-operative period, but were found in one-fifth of patients 1 month later. We conclude that abnormal dispersion of QT is, to some extent, a fact of the natural history of tetralogy of Fallot, but is significantly amplified by surgery. Ventricular late potentials, on the other hand, are absent before surgery, but appear with some delay after the operation, probably as a result of scarring rather than the surgical incision itself. Long-term follow-up is needed to assess the significance of these findings.

journal_name

Cardiol Young

journal_title

Cardiology in the young

authors

Balkhi RA,Beghetti M,Friedli B

doi

10.1017/S1047951104004020

keywords:

subject

Has Abstract

pub_date

2004-08-01 00:00:00

pages

360-6

issue

4

eissn

1047-9511

issn

1467-1107

pii

S1047951104004020

journal_volume

14

pub_type

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