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Cerebral injury and cardiac operations
1Section of Cardiothoracic Surgery, Wake Forest University Medical Center, Winston-Salem, North Carolina.
Insights
Cerebral complications, including stroke and cognitive changes, are common after cardiac surgery, particularly in older patients. Cardiopulmonary bypass is a major cause, with potential mechanisms including embolization and reduced blood flow to the brain.
Area of Science:
- Neurology
- Cardiology
- Neurosurgery
Background:
- Cerebral complications are the primary cause of disability following cardiac surgery.
- The incidence of stroke after coronary artery bypass grafting is rising due to an aging patient population.
- Postoperative cognitive deficits significantly impact patient recovery and satisfaction.
Purpose of the Study:
- To review the incidence, mechanisms, and assessment methods of cerebral complications after cardiac operations.
- To highlight the impact of cardiopulmonary bypass on brain injury.
- To synthesize current knowledge on managing and preventing neurological deficits.
Main Methods:
- Literature review of studies on cerebral complications after cardiac surgery.
- Analysis of potential mechanisms including embolization and altered cerebral perfusion.
- Examination of assessment techniques during and after surgery.
Main Results:
- Neurologic deficits (stroke, seizures) occur in 1-6% of patients.
- Neuropsychologic deficits (cognitive changes) affect 60-80% at 1 week and 20-40% at 8 weeks post-operation.
- Cardiopulmonary bypass is implicated through macro/microembolization and inadequate cerebral perfusion.
Conclusions:
- Cerebral complications are a significant concern after cardiac operations, impacting patient outcomes.
- Understanding the mechanisms of brain injury during cardiopulmonary bypass is crucial for prevention.
- Multimodal assessment strategies are essential for evaluating and managing these complications.
Abstract:
Cerebral complications constitute the leading source of morbidity and disability after cardiac operations. The incidence of stroke after coronary artery bypass grafting has increased in tandem with the mean age of the patient population. Although many cerebral deficits resolve with time, others remain sources of disability for otherwise functional patients and detract from an otherwise successful procedure. The clinical spectrum of cerebral complications includes both neurologic and neuropsychologic deficits. Neurologic deficits include fatal cerebral injury, stroke, impaired level of consciousness, and seizures. The incidence of these deficits is 1% to 6%. Neuropsychologic deficits refer to cognitive changes, and are quantitated with tests of memory and learning and speed of visual-motor response. The incidence of these deficits is 60% to 80% at 1 week after operation and 20% to 40% at 8 weeks after operation. Central nervous system complications after cardiac operations have been attributed in large part to the effects of cardiopulmonary bypass on the brain. Potential mechanisms include macroembolization of air or particulate matter; microembolization of gas, fat, aggregates of blood cells, platelets or fibrin, and particles of silicone or polyvinylchloride tubing; and inadequate cerebral perfusion pressure. Methods of assessment include those applied during the procedure (clinical observation, assessment of cerebral blood flow and metabolism, intraoperative electroencephalography, transcranial and carotid Doppler echography, quantitative embolic measurement, and fluorescein angiography) and those performed to measure outcome (neurologic and neuropsychologic testing, computed tomographic scans, magnetic resonance imaging, and cerebrospinal fluid studies). Much of the literature regarding cerebral injury and cardiopulmonary bypass is descriptive, relating patient risk factors to the incidence of postoperative stroke.(ABSTRACT TRUNCATED AT 250 WORDS)