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Neuropsychiatric complications of cardiac surgery
1Department of Anesthesia, University of California, San Francisco.
Insights
Neurologic complications in cardiac surgery, particularly coronary artery bypass grafting (CABG), are often caused by emboli. Risk factors and protective strategies are being investigated to improve patient outcomes.
Area of Science:
- Cardiovascular Surgery
- Neurology
- Medical Complications
Background:
- Intracardiac operations historically have a higher risk of neurologic complications than coronary artery bypass grafting (CABG).
- The incidence of neurologic complications after CABG has been increasing.
- Macroemboli from the surgical field are the primary cause of neurologic complications in both intracardiac and extracardiac surgery.
Purpose of the Study:
- To review the causes and risk factors for neurologic complications during cardiac surgery.
- To evaluate the effectiveness of various strategies in mitigating these complications.
Main Methods:
- Review of existing literature on neurologic complications in cardiac surgery.
- Identification of high-risk periods during surgery (aortic cannulation, bypass onset/weaning).
- Analysis of risk factors including patient comorbidities and surgical variables.
Main Results:
- Key risk factors include ascending aorta atherosclerosis, advanced age, cerebrovascular disease, and diabetes.
- Hypothermia's benefit may be limited in routine cardiac operations.
- Barbiturate protection may benefit intracardiac surgery, but not extracardiac.
- Membrane oxygenation and arterial filtration have not shown improved outcomes.
- No correlation found between neurologic injury and glucose levels, hypotension, or blood gas management during hypothermic CABG.
Conclusions:
- Neurologic complications in cardiac surgery are multifactorial, with emboli being a primary concern.
- Identifying and mitigating risk factors, alongside judicious use of protective strategies, is crucial.
- Further research is needed to optimize patient outcomes and reduce neurologic deficits post-cardiac surgery.
Abstract:
Historically, intracardiac operations have carried a higher risk of neurologic complications than coronary artery bypass grafting (CABG) procedures, although the incidence of such complications has been increasing after CABG in recent years. In both intracardiac and extracardiac surgery, macroemboli from the surgical field cause most neurologic complications. The periods of highest risk for emboli are during aortic cannulation, onset of bypass, and weaning from bypass. Risk factors include atherosclerosis of the ascending aorta, advanced age, presence of concomitant cerebral vascular disease, previous neurologic abnormality, duration of surgery, diabetes, and history of failure of the native circulation. Although hypothermia is beneficial in elective circulatory arrest, its usefulness in reducing postoperative central nervous system deficits during routine cardiac operations may be limited. Studies suggest a role for barbiturate protection in intracardiac but not in extracardiac surgery. Studies have not shown better neurologic or neuropsychological outcome with the use of membrane oxygenation and arterial filtration. Recent studies suggest no correlation of neurologic injury with serum glucose levels during CABG, with either duration or severity of hypotension during hypothermic CABG, or with blood gas management during hypothermic CABG.