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Related Experiment Videos

Mitral annular dynamics during rapid atrial pacing.

T A Timek1, D T Lai, P Dagum

  • 1Department of Cardiovascular and Thoracic Surgery, Stanford University School of Medicine, CA 94305-5247, USA.

Surgery
|August 3, 2000
PubMed
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Rapid atrial pacing significantly reduces ovine mitral annular area (MAA) and left atrial volume (LAV) during diastole. This suggests MAA dynamics are closely linked to left atrial function.

Area of Science:

  • Cardiovascular Physiology
  • Cardiac Mechanics
  • Echocardiography

Background:

  • Mitral annular area (MAA) reduction primarily occurs before ventricular systole.
  • Investigating left atrial and MAA dynamics during rapid atrial pacing is crucial for understanding cardiac function.

Purpose of the Study:

  • To investigate left atrial and MAA dynamics during rapid atrial pacing using myocardial marker methods.
  • To quantify changes in MAA and left atrial volume (LAV) under paced conditions.

Main Methods:

  • Seven sheep were implanted with myocardial markers around the mitral annulus, left ventricle, and left atrium.
  • Biplane videofluoroscopy was used to determine 3D marker coordinates during unpaced and rapid atrial pacing (140 min⁻¹).
  • Left ventricle volume, LAV, and MAA were calculated; timing of minimum MAA and LAV relative to end diastole (ED) was analyzed.

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Main Results:

  • Minimum MAA and LAV occurred earlier relative to ED during rapid pacing compared to control (P <.001).
  • Rapid pacing significantly reduced minimum MAA (6.8 vs 6.5 cm²; P <.05) and LAV (15.4 vs 16.5 mL; P <.01).
  • A greater fractional reduction in MAA and LAV was observed during presystole with rapid pacing.

Conclusions:

  • Rapid atrial pacing leads to increased MAA and LAV reduction, occurring entirely during diastole.
  • MAA reduction is closely associated with left atrial dynamics, particularly under conditions of increased heart rate.