Related Experiment Videos
Cardiopulmonary bypass time does not affect cerebral blood flow
N D Croughwell1, J G Reves, W D White
1Department of Anesthesiology, Duke Heart Center, Duke University Hospital, Durham, North Carolina, USA.
The Annals of Thoracic Surgery
|May 22, 1998
Summary
Mildly hypothermic cardiopulmonary bypass (CPB) does not affect cerebral blood flow (CBF) over time. This study found no correlation between CPB duration and CBF, indicating preserved cerebral flow-metabolism coupling.
Area of Science:
- Cardiovascular Surgery
- Neuroscience
- Physiology
Background:
- Conflicting reports exist regarding cerebral blood flow (CBF) changes during hypothermic cardiopulmonary bypass (CPB).
- Some studies suggest a time-dependent decline in CBF, while others show preservation.
- This study aimed to clarify the impact of CPB duration on CBF.
Purpose of the Study:
- To determine if the duration of mildly hypothermic cardiopulmonary bypass influences cerebral blood flow.
- To investigate the relationship between cardiopulmonary bypass time and cerebral blood flow in cardiac surgery patients.
Main Methods:
- Cerebral blood flow (CBF) was measured using xenon-133 washout.
- Alpha-stat blood gas management was employed during non-pulsatile cardiopulmonary bypass (CPB).
- CBF was assessed at the start and near the end of CPB at a flow rate of 2.4 L/min/m².
Main Results:
- No significant correlation was found between the duration of cardiopulmonary bypass (CPB) and cerebral blood flow (CBF) (p = 0.47).
- Patient temperature (35.5°C to 35.6°C) and arterial carbon dioxide tension (36-37 mm Hg) remained stable.
- The findings contrast with studies suggesting CPB duration intrinsically affects CBF.
Conclusions:
- Mildly hypothermic cardiopulmonary bypass (CPB) does not lead to a time-dependent decrease in cerebral blood flow (CBF).
- Cerebral flow-metabolism coupling remains intact at approximately 35°C during CPB.