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Neurological and cognitive disorders after coronary artery bypass grafting
1Oxford Heart Centre, John Radcliffe Hospital, Oxford OX3 9DU, England. david.taggart@orh.nhs.uk
Insights
Coronary artery bypass grafting (CABG) can cause cerebral injury, leading to stroke and cognitive impairment. Minimizing this risk may involve using arterial grafts on a beating heart, reducing neurological complications.
Area of Science:
- Neurology
- Cardiovascular Surgery
- Anesthesiology
Background:
- Cerebral injury is a significant complication of coronary artery bypass grafting (CABG), contributing to mortality and morbidity.
- Stroke, occurring in 3% of patients, is primarily linked to aortic atheromatous emboli, while cognitive impairment often stems from microembolization during cardiotomy suction.
- Other factors like anesthesia and hypoperfusion also contribute to neurological deficits, as evidenced by similar cognitive impairments in non-cardiopulmonary bypass procedures.
Purpose of the Study:
- To review the mechanisms of cerebral injury in CABG patients.
- To discuss strategies for reducing neurological complications associated with CABG.
- To evaluate the effectiveness of newer surgical approaches in mitigating cerebral injury risks.
Main Methods:
- Review of existing literature on neurological complications following CABG.
- Analysis of pathophysiological mechanisms contributing to cerebral injury, including embolization, anesthesia, and hypoperfusion.
- Discussion of advancements in medical, anesthetic, and surgical management.
Main Results:
- Neurological injury incidence in CABG has decreased due to improved management strategies.
- An aging population with increased comorbidities presents a higher risk profile for cerebral injury in CABG candidates.
- Composite arterial grafts used in off-pump CABG show promise in minimizing neurological risks.
Conclusions:
- Despite advances, cerebral injury remains a concern in CABG, particularly with an aging, comorbid patient population.
- Minimizing embolization and considering alternative surgical techniques are crucial for reducing neurological damage.
- Off-pump CABG using arterial grafts may offer the most effective approach to prevent cerebral injury during this procedure.
Abstract:
Cerebral injury is a major cause of mortality and morbidity of coronary artery bypass grafting. Stroke occurs in 3% of patients and is largely caused by embolization of atheromatous debris during manipulation of the diseased aorta. Cognitive impairment, which is predominantly caused by microembolization of gaseous and particulate matter, mainly generated by cardiotomy suction, is more common. Demonstration of similar cognitive impairment in patients operated on without cardiopulmonary bypass indicates that other pathophysiological mechanisms, such as anaesthesia and hypoperfusion, are also involved. Advances in medical, anesthetic, and surgical management have resulted in a reduction in the incidence of neurological injury in CABG patients over the past decade. On the other hand, an increasingly elderly population with more severe comorbidity, who are more prone to cerebral injury, are increasingly being referred for CABG. Possible mechanisms to reduce overt and subtle cerebral injury are discussed. The use of composite arterial grafts performed on the beating heart may be the most effective way of minimizing the risk of cerebral injury associated with CABG.