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Full ventricular capture indicated by the QT interval function

C Gottfridsson1, I Wallentin, L Dernevik

  • 1Department of Cardiology, University Hospital, Goäteborg, Sweden.

Pacing and Clinical Electrophysiology : PACE
|November 24, 1998
PubMed
Summary
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The study found that the bending point in QT interval measurements accurately predicts full ventricular capture and fusion in dual chamber pacing for hypertrophic obstructive cardiomyopathy patients. This suggests QT interval analysis may enable automatic capture detection.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Biomedical Engineering

Background:

  • The atrioventricular (AV) interval is crucial in dual chamber (DDD) pacing for hypertrophic obstructive cardiomyopathy (HOCM) patients.
  • Optimizing the AV interval ensures full ventricular capture (FVC), reduces left ventricular (LV) outflow gradients, and improves LV diastolic filling.

Purpose of the Study:

  • To investigate the relationship between AV interval, QT interval, FVC, and fusion in DDD pacing.
  • To determine if QT interval measurements can reliably identify optimal pacing parameters in HOCM.

Main Methods:

  • 11 patients with cardiac conditions and stable AV conduction received DDD pacemakers with QT sensing capabilities.
  • The AV interval was systematically shortened from 400 ms to 90 ms, and then lengthened at a faster pacing rate, while measuring QT intervals.

Related Experiment Videos

  • Full ventricular capture (FVC) and fusion were assessed using surface ECG.

    • Main Results:

    • Shortening the AV interval initially shortened the QT interval, then prolonged it until it stabilized at the FVC point.
    • The "bending point" in the QT interval versus AV interval plot correlated well with FVC.
    • Similar correlations were observed for fusion when lengthening the AV interval at an increased pacing rate.

    Conclusions:

    • The bending point in QT interval plots reliably indicates FVC and fusion during DDD pacing.
    • QT interval measurement presents a feasible method for automatic discrimination between fusion and full capture in pacing.