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Pediatric Cardiology

, Volume 9, Issue 2, pp 85–89 | Cite as

Atrial pacing to estimate total sinoatrial conduction time in children

  • Robert M. Campbell
  • Macdonald DickII
  • Dennis C. Crowley
  • Albert P. Rocchini
  • A. Rebecca Snider
  • Amnon Rosenthal
Article

Summary

No data exist concerning the total sinoatrial conduction time (TSACT) in children that compare values determined by the atrial extrastimulation technique (TSACTS) with those generated by the atrial pacing method (TSACTN). In this study, TSACT in 55 patients, age 0.2–18.5, was measured using both techniques. TSACTN was performed at a mean 90% (TSACTN−90) (n=32) or a mean 95% (TSACTN−95 and (n=38) of sinus cycle length (SCL). When data generated during determination of TSACTN−90 and TSACTS were compared, SCL and recovery cycle length (REC) were similar for both techniques. Likewise, TSACTS (128±40 ms) and TSACTN−90 (126±74 ms) were not significantly different. Coefficient of correlation wasr=0.82,p<0.001. Chi-square analysis demonstrated a strong association of normal and abnormal values between TSACTS and TSACTN−90. In contrast, when values generated during TSACTN−95 and TSACTS were compared, TSACTS exceeded TSACTN−95 (137±38 vs 105±58 ms;p<0.001). Values for SCL and REC were similar while correlation between TSACT determined by the two techniques remained strong (r=0.82,p<0.001). Despite a good correlation between TSACTN−90 and TSACTS, individual differences in magnitude and direction were noted between the two techniques.

In summary, TSACTN−90 approximates TSACTS in children. TSACTN−90 is preferable to TSACTN−95, probably due to more complete sinus node capture during atrial pacing. However, the behavior of the sinus node in response to extrastimuli (single or train) precludes favoring one technique over the other. More precise evaluation of sinoatrial conduction will require direct recording of sinus node activity.

Key words

Sinoatrial conduction Atrial pacing 

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Copyright information

© Springer-Verlag New York Inc 1988

Authors and Affiliations

  • Robert M. Campbell
    • 1
  • Macdonald DickII
    • 1
  • Dennis C. Crowley
    • 1
  • Albert P. Rocchini
    • 1
  • A. Rebecca Snider
    • 1
  • Amnon Rosenthal
    • 1
  1. 1.Division of Pediatric Cardiology, C.S. Mott Children's Hospital, Department of PediatricsUniversity of MichiganAnn ArborUSA

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