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Related Experiment Videos

Slow rate during AF improves ventricular performance by reducing sensitivity to cycle length irregularity.

Zoran B Popović1, Kent A Mowrey, Youhua Zhang

  • 1Department of Cardiovascular Medicine, The Cleveland Clinic Foundation, Ohio 44195, USA.

American Journal of Physiology. Heart and Circulatory Physiology
|October 22, 2002
PubMed
Summary
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Slowing heart rate during atrial fibrillation (AF) reduces the impact of irregular ventricular cycle lengths (VCL) on heart performance. This finding suggests that managing VCL irregularity is less critical when heart rate is controlled.

Area of Science:

  • Cardiology
  • Physiology

Background:

  • Atrial fibrillation (AF) presents with rapid and irregular ventricular cycle lengths (VCL).
  • Heart rate slowing (VCL prolongation) is known to benefit AF patients, but the effect of irregularity itself is less understood.

Purpose of the Study:

  • To investigate the impact of ventricular cycle length (VCL) irregularity on left ventricular (LV) performance during atrial fibrillation (AF).
  • To determine if prolonging VCL affects the sensitivity of LV performance parameters to cycle length irregularity.

Main Methods:

  • Studied 10 anesthetized dogs during induced AF.
  • Recorded R-R intervals, LV pressure, and aortic flow.
  • Manipulated VCL using AV nodal vagal stimulation to achieve 75%, 100%, and 125% of intrinsic sinus cycle length.
Keywords:
Non-programmatic

Related Experiment Videos

  • Assessed cycle length irregularity using the RR(p)/RR(pp) ratio.
  • Analyzed LV performance metrics (maximum LV power, dP/dt_min, relaxation time constant) via nonlinear fitting.

    • Main Results:

    • Prolonging VCL led to a significant decrease in the dependence of LV performance on cycle length irregularity.
    • A plateau effect was observed, indicating reduced sensitivity to irregularity as VCL increased.
    • LV performance parameters showed less variability with increased VCL.

    Conclusions:

    • Prolongation of VCL during AF significantly reduces the sensitivity of LV performance parameters to cycle length irregularity.
    • These findings highlight the importance of heart rate control in mitigating the adverse effects of irregular rhythms in AF.