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Related Experiment Videos

Intravascular platelet aggregation and spontaneous contrast

C Mahony1, C Spain, M Spain

  • 1Division of Cardiology, University of Kentucky Medical Center, Lexington 40536-0084.

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|June 1, 1994
PubMed
Summary

General anesthesia can cause spontaneous contrast in dogs, particularly with chloralose-urethane. This is linked to platelet aggregation, a finding confirmed in vitro and in vivo.

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Area of Science:

  • Veterinary Medicine
  • Cardiovascular Physiology
  • Anesthesiology

Background:

  • Spontaneous contrast on echocardiography can indicate thromboembolic disease.
  • The causes of spontaneous contrast after general anesthesia in dogs are not fully understood.

Purpose of the Study:

  • To investigate the mechanism of spontaneous contrast development following general anesthesia in dogs.
  • To determine the role of platelet aggregation in anesthesia-induced spontaneous contrast.

Main Methods:

  • Echocardiography was performed on 27 dogs before and after general anesthesia (pentobarbital or chloralose-urethane).
  • Platelet and platelet-neutrophil aggregates were assessed.
  • In vitro and in vivo experiments using adenosine diphosphate and antiplatelet antibodies were conducted to confirm the role of platelet aggregation.

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Main Results:

  • Spontaneous contrast developed in 10 of 15 dogs receiving chloralose-urethane anesthesia, but none of the 12 dogs receiving pentobarbital.
  • Contrast development was significantly associated with large platelet and platelet-neutrophil aggregates (P < 0.01).
  • Intravascular platelet aggregation was confirmed to cause ultrasonic contrast.

Conclusions:

  • Chloralose-urethane anesthesia, unlike pentobarbital, can induce spontaneous contrast in dogs.
  • Platelet aggregation is a key mechanism underlying anesthesia-induced spontaneous contrast.
  • Findings have implications for understanding and managing spontaneous contrast in clinical settings.