Sinoatrial Conduction in Children An Index of Sinoatrial Node Function

    loading  Checking for direct PDF access through Ovid

Abstract

SUMMARY

The premature atrial stimulus technique was used to evaluate sinoatrial conduction (SAC) in 50 children (age range 6 months to 21 years; median 6.5 years) to obtain normal values of sinoatrial conduction time (SACT) and to determine the usefulness of the technique in evaluation of sinoatrial node (SAN) dysfunc-tion in children. The results in the normal group (n =20) were compared with those of patients with documented SAN dysfunction (group 1, n = 20) or at risk to develop SAN dysfunction because of a previous intracardiac operation (group 2, n = 10). Among the 30 patients in groups 1 and 2, 23 had undergone an intra-cardiac operation 13 Mustard operations and five closures of an atrial septal defect.

In group 1, the mean value of total SACT was 172 msec ± 42 (SD) compared with 124 msec ± 38 in the nor-mal group (p < 0.001). Each of the 20 patients in group 1 had abnormal SAN automaticity (prolonged cor-rected sinus node recovery time, CSNRT) and 13 of the 20 had abnormal SAC. While each of the 10 patients in group 2 had normal CSNRT, two of them had abnormal SAC.

We conclude that the evaluation of SAC should be included in the assessment of children with suspected SAN dysfunction.

Related Topics

    loading  Loading Related Articles