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Related Experiment Videos

Specific bypass conditions determine safe minimum flow rate.

Vesa Anttila1, Ikuo Hagino, David Zurakowski

  • 1Department of Pathology, Children's Hospital Boston, Harvard Medical School, Boston, Massachusetts, USA.

The Annals of Thoracic Surgery
|September 27, 2005
PubMed
Summary
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Determining safe cardiopulmonary bypass flow rates is crucial. Near-infrared spectroscopy monitoring of tissue oxygen index (TOI) can identify inadequate cerebral perfusion, with safe flow rates varying by temperature.

Area of Science:

  • Cardiovascular Surgery
  • Neuroscience
  • Physiology

Background:

  • Cerebral microcirculation requires careful monitoring during cardiopulmonary bypass (CPB).
  • Defining safe minimum flow rates is essential for preventing neurological injury.
  • Near-infrared spectroscopy (NIRS) offers a non-invasive method for assessing cerebral perfusion.

Purpose of the Study:

  • To establish a safe minimum flow rate for CPB under specific conditions.
  • To utilize continuous NIRS monitoring and direct observation of cerebral microcirculation.
  • To correlate microcirculatory parameters with neurological outcomes.

Main Methods:

  • Piglets underwent cooling to 15, 25, or 34°C on CPB with varying hematocrit levels.
  • Cranial windows and intravital microscopy assessed microcirculation, functional capillary density (FCD), and microvascular diameter.

Related Experiment Videos

  • NIRS monitored tissue oxygenation index (TOI); histologic and neurologic injury scores were evaluated.

    • Main Results:

    • TOI and FCD during low flow and rewarming correlated with neurologic injury.
    • Failure of FCD to normalize during rewarming predicted poorer outcomes (p < 0.001).
    • Temperature and low-flow rate were significant predictors of TOI and FCD during rewarming (p < 0.001).

    Conclusions:

    • NIRS-derived TOI is a valuable real-time monitor for cerebral perfusion adequacy during CPB.
    • Safe minimum pump flow rates are condition-dependent, varying with temperature, hematocrit, and bypass duration.
    • A flow rate of 10 mL.kg⁻¹.min⁻¹ may be safe at 15°C but risks injury at 34°C.