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Related Experiment Videos

Right coronary autoregulation in conscious, chronically instrumented dogs

X Bian1, A G Williams, P A Gwirtz

  • 1Department of Integrative Physiology, University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas 76107, USA.

The American Journal of Physiology
|August 5, 1998
PubMed
Summary

Conscious dogs exhibit right coronary autoregulation, with anesthesia affecting its range, not degree. Right ventricular function remains stable until right coronary pressure drops below 50 mmHg.

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Autoregulation
  • Ventricular Function

Background:

  • Understanding right coronary artery (RC) autoregulation and right ventricular (RV) function is crucial for cardiac health.
  • Previous studies on RC autoregulation often involved extracorporeal perfusion systems, potentially altering physiological responses.
  • Assessing these functions in conscious versus anesthetized states provides insights into the impact of anesthesia on cardiac regulation.

Purpose of the Study:

  • To evaluate right coronary (RC) autoregulation and right ventricular (RV) function in conscious dogs.
  • To compare RC autoregulation and RV function between conscious and anesthetized states.
  • To investigate the influence of anesthesia and extracorporeal perfusion on these cardiac parameters.

Main Methods:

Related Experiment Videos

  • Conscious dogs were instrumented to measure RC flow and pressure (RCP) during controlled hydraulic occlusion.
  • Anesthesia was administered, and RC autoregulation and RV function were reassessed.
  • Closed-loop gains (Gc) were calculated to quantify autoregulation, and RV contractile function was monitored.

Main Results:

  • Moderate RC autoregulation was observed in conscious dogs (Gc: 0.59-0.27) as RCP decreased from 100 to 40 mmHg.
  • Anesthesia did not significantly reduce Gc at RCP >50 mmHg, but potentially limited the range of autoregulation.
  • RV contractile function was maintained in both states until RCP fell below 45-50 mmHg.
  • RV autoregulation range and potency exceeded previously reported findings in anesthetized dogs with extracorporeal perfusion.

Conclusions:

  • Modest RC autoregulation is present in conscious dogs.
  • Anesthesia influences the range, but not the degree, of RC autoregulation.
  • Extracorporeal perfusion systems may attenuate RC autoregulation.
  • RV contractile function is preserved until RCP significantly decreases in both conscious and anesthetized states.