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Cerebral metabolism and function during normothermic retrograde cerebral perfusion
1Department of Thoracic Surgery, Nagoya University School of Medicine, Aichi, Japan.
Cardiovascular Surgery (London, England)
|April 1, 1993
Summary
Retrograde cerebral perfusion protects the brain during circulatory arrest. This technique, using superior vena cava (SVC) cannulation, offers some brain protection despite insufficient oxygenation for full function.
Area of Science:
- Cardiovascular Surgery
- Neuroprotection
- Cerebral Perfusion
Background:
- Circulatory arrest poses a risk to brain function.
- New techniques are needed to protect the brain during cardiac procedures.
- Retrograde cerebral perfusion (RCP) is an emerging technique.
Purpose of the Study:
- To evaluate the efficacy of retrograde cerebral perfusion (RCP) via superior vena cava (SVC) cannulation.
- To assess brain protection during circulatory arrest.
- To measure cerebral blood flow, oxygen consumption, and brainstem responses during RCP.
Main Methods:
- Mongrel dogs (n=12) underwent normothermic cardiopulmonary bypass (CPB).
- Retrograde cerebral perfusion was initiated at varying rates (100, 200, 300 ml/min) via SVC cannula.
- Cerebral blood flow, oxygen and glucose consumption, and auditory brainstem responses (ABRs) were measured.
Main Results:
- Increasing RCP rates increased jugular venous pressure, oxygen, and glucose consumption.
- RCP at 300 ml/min provided approximately half the cerebral blood flow of antegrade CPB.
- Auditory brainstem responses were abolished during RCP but recovered upon resumption of CPB.
Conclusions:
- Retrograde cerebral perfusion via SVC offers partial brain protection during circulatory arrest.
- The oxygen supply during RCP is insufficient for complete cerebral function maintenance.
- RCP may serve as a valuable adjunct for neuroprotection in cardiac surgery.