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Related Experiment Videos

Regional perfusion abnormalities with phenylephrine during normothermic bypass

C O'Dwyer1, L C Woodson, B P Conroy

  • 1Department of Anesthesiology, University of Texas Medical Branch, Galveston 77555-0591, USA.

The Annals of Thoracic Surgery
|March 1, 1997
PubMed
Summary

Restoring aortic pressure during cardiopulmonary bypass by increasing pump flow improves splanchnic perfusion more effectively than phenylephrine. Vasopressors may mask organ hypoperfusion despite adequate pressure.

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Area of Science:

  • Cardiovascular Surgery
  • Physiology
  • Anesthesiology

Background:

  • Hypotension during cardiopulmonary bypass (CPB) can lead to splanchnic ischemia.
  • Vasopressor use during CPB requires careful evaluation of its impact on organ perfusion.

Purpose of the Study:

  • To compare the effects of increasing pump flow versus phenylephrine infusion on restoring aortic pressure and organ perfusion during CPB.
  • To assess the impact on visceral organs, brain, and femoral muscle.

Main Methods:

  • Anesthetized swine underwent normothermic CPB.
  • Aortic pressure was reduced to 40 mm Hg and then restored to 65 mm Hg via increased pump flow or phenylephrine titration.
  • Regional blood flow was measured using radioactive microspheres.

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Main Results:

  • Reduced perfusion to visceral organs and femoral muscle at 40 mm Hg aortic pressure; brain perfusion was unaffected.
  • Increased pump flow improved perfusion to the pancreas, colon, and kidneys.
  • Phenylephrine increased aortic pressure but did not improve splanchnic perfusion, showing significant differences compared to increased pump flow.

Conclusions:

  • Increasing systemic pressure with phenylephrine during CPB results in lower splanchnic blood flow compared to increasing pump flow.
  • Vasoconstrictors like phenylephrine may obscure significant splanchnic hypoperfusion during CPB, even when perfusion pressure is restored.