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Cerebral physiology in paediatric cardiopulmonary bypass
1Department of Anaesthesia, Hospital for Sick Children, University of Toronto, Ontario, Canada.
Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|December 4, 1998
Summary
Neurological injury is more common in infants and children undergoing open-heart surgery due to cardiopulmonary bypass (CPB) and hypothermic circulatory arrest. Strategies are evolving to improve cerebral protection and outcomes.
Area of Science:
- Pediatric Cardiac Surgery
- Neuroscience
- Cardiovascular Physiology
Background:
- Neurological injury is a significant concern following open-heart surgery in pediatric patients.
- Cardiopulmonary bypass (CPB), hypothermia, and deep hypothermic circulatory arrest (DHCA) are critical components of cardiac surgery but can impact brain function.
- Understanding the effects of these interventions on cerebral blood flow (CBF), metabolism, and temperature is crucial for patient outcomes.
Purpose of the Study:
- To review and analyze existing studies on neurological injury in infants and children undergoing open-heart surgery.
- To examine the impact of cardiopulmonary bypass, hypothermia, and DHCA on cerebral blood flow, metabolism, and brain temperature.
- To discuss factors contributing to neurological dysfunction and neuronal ischemia in this patient population.
Main Methods:
- Systematic review of articles from Current Science and Medline databases (1966-present).
- Search terms included cardiopulmonary bypass (CPB), hypothermia, cerebral blood flow (CBF), cerebral metabolism, and brain temperature.
- Inclusion of information from relevant scientific meetings and abstracts.
Main Results:
- Neurological morbidity is higher in infants and children (up to 30%) compared to adults (7-87%) undergoing CPB.
- Postoperative cerebral dysfunction and ischemia result from a combination of patient factors and intraoperative events.
- Deep hypothermic circulatory arrest negatively affects CBF and cerebral metabolism, with inadequate cooling and rapid rewarming exacerbating the issue.
Conclusions:
- Emerging strategies like low-flow CPB, pulsatile CPB, pH-stat management, and cold reperfusion aim to enhance cerebral protection.
- Advancements in monitoring technology and a deeper understanding of CBF-metabolism relationships during CPB are vital.
- Improved strategies are needed to optimize neurological and developmental outcomes in pediatric cardiac surgery patients.