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The Human Sinus Node Electrogram on the Overdrive Suppression Test and Estimated Sinoatrial Conduction Time Measurements

  • Iwao Yamaguchi
  • T. Togo
  • H. Suzuki
  • T. Kurusu
  • K. Iida
  • T. Sekiguchi
  • Y. Sugishita
  • I. Ito
Conference paper

Summary

Sinus node electrograms (SNEs) on atrial overdrive suppression test (AOD) and estimated sinoatrial conduction time (SACT) measurements were recorded. Typical SNE (TSNE), characterized by low-frequency, anatomically localized pre-P wave potentials (Reiffel et al.) were obtained in 12 of 18 patients (pts) with normal sinus node function (group I) and 15 of 26 pts with sick sinus syndrome (SSS) (group II). In 9 of 15 SSS pts but only 2 or 12 in group I “atypical” SNEs (ASNE) with inverted waves at the beginning of P wave were recorded on SNE recordings of the first sinus recovery beat by overdrive atrial pacing (OAP) for either AOD or SACT measurements, or both. On the basis of ASNE following OAP, the 26 SSS pts fell into 3 subgroups: TSNE with the same configuration as recorded before OAP was observed without ASNE throughout the study in 6 pts (IIA). ASNE was observed without TSNE throughout the study in 11 pts (IIB). TSNE before OAP and ASNE following OAP were recorded in 9 pts (IIC). Corrected sinus node recovery time in IIB was significantly longer than in either IIA or IIC (P < 0.0005). Estimated SACT (Narula’s method) for either A, B or C was significantly (P < 0.0005) longer than in group I. There was no significant difference in either estimated SACT or directly measured SACT between IIA and IIC. A significant correlation existed between estimated SACT and directly measured SACT in group I (r = 0.88) and IIA (r = 0.75) (P < 0.01) but not in IIC (r = 0.48). ASNE may result from a pacemaker shift.

Keywords

Sinus Node Sick Sinus Syndrome Sinus Node Function Sudden Termination Bundle Electrogram 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    Hariman RJ, Krongrad E, Boxer RA, Weiss MB, Steeg CN, Hoffman, BF: Method for recording electrical activity of the sinoatrial node and automatic atrial foci during cardiac catheterization in human subjects. Am J Cardiol 1980; 453 775–781.CrossRefGoogle Scholar
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    Reiffel JA, Gang E, Gliklich J, Weiss MB, Davis JC, Patton IN, Bigger JT: The human sinus node electrogram. A transvenous catheter technique and a comparison of directly measured and indirectly estimated sinoatrial conduction time in adults. Circulation 1980; 62: 1324–1334.CrossRefPubMedGoogle Scholar
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    Gomes JAC, Kang PS, El-Sherif N: The sinus node electrogram in patients with and without sick sinus syndrome. Techniques and correlation between directly measured and indirectly estimated sinoatrial conduction time. Circulation 1982; 66: 864–873.CrossRefPubMedGoogle Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag, GmbH & Co. KG, Darmstadt 1983

Authors and Affiliations

  • Iwao Yamaguchi
    • 1
  • T. Togo
  • H. Suzuki
  • T. Kurusu
  • K. Iida
  • T. Sekiguchi
  • Y. Sugishita
  • I. Ito
  1. 1.School of MedicineUniversity of TsukubaNiihari-Gun, IbarakiJapan

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