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Sinus node electrogram recording in complete atrioventricular block.

D Zhang1, S Chen, Y Xi

  • 1Affiliated Hospital of Ningxia Medical College, Yinchuan, People's Republic of China.

Journal of Electrocardiology
|October 1, 1989
PubMed
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This study investigated sinus node conduction in complete atrioventricular block (CAVB). Some patients showed prolonged sinoatrial conduction time (SACTd), indicating abnormal sinus node function.

Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Complete atrioventricular block (CAVB) presents diagnostic challenges.
  • Understanding sinus node function is crucial in managing cardiac conduction disorders.

Purpose of the Study:

  • To evaluate sinus node conduction in patients with CAVB.
  • To assess the origin and timing of atrial activation using advanced electrophysiological recordings.

Main Methods:

  • Synchronous recording of surface ECG, sinus node electrogram (SNE), His bundle electrogram (HBE), and high right atrial electrogram (HRA).
  • Analysis of pre-P waves on SNE to confirm sinus node origin.
  • Measurement of direct sinoatrial conduction time (SACTd).

Main Results:

  • A pre-P wave, originating from the sinus node, consistently preceded the ECG P wave.

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  • Direct sinoatrial conduction time (SACTd) was normal in most cases.
  • Two cases exhibited prolonged SACTd (185 msec and 210 msec), suggesting abnormal sinus node conduction.

    • Conclusions:

    • Sinus node electrograms are valuable for assessing sinus node function in CAVB.
    • Prolonged SACTd indicates impaired sinus node conduction in some CAVB patients.
    • Further investigation into sinus node dysfunction in CAVB is warranted.