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Neurologic outcomes after coronary artery bypass grafting with and without cardiopulmonary bypass
John E Scarborough1, William White, Frantz E Derilus
1Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA.
Insights
Neurologic injury after coronary artery bypass grafting (CABG) is common. Strategies like hypothermia and off-pump CABG may reduce risks, but further research is needed for neurocognitive impairment.
Area of Science:
- Cardiovascular Surgery
- Neurology
- Medical Complications
Background:
- Neurologic injury, including stroke and neurocognitive impairment, is a significant complication following coronary artery bypass grafting (CABG).
- The primary causes of this injury are multifactorial, with cerebral hypoperfusion and embolism being key contributors.
Purpose of the Study:
- To review perioperative strategies aimed at reducing neurologic complications associated with CABG.
- To evaluate the effectiveness of current and emerging techniques in minimizing adverse neurologic outcomes.
Main Methods:
- Review of existing literature on perioperative strategies for neurologic protection during CABG.
- Analysis of studies investigating hypothermic cerebral perfusion, alpha-stat acid-base management, and off-pump CABG (OPCABG).
- Consideration of novel technical innovations like sutureless and clampless aortic anastomotic devices.
Main Results:
- Hypothermic cerebral perfusion, alpha-stat management, and slow rewarming have demonstrated efficacy in reducing neurologic sequelae during cardiopulmonary bypass.
- Off-pump CABG has been shown to decrease the risk of perioperative stroke, particularly in elderly, high-risk patients.
- The impact of OPCABG on less severe neurocognitive impairment requires further investigation through large-scale, randomized trials.
Conclusions:
- Several perioperative strategies can mitigate neurologic injury during CABG.
- While OPCABG reduces stroke risk, its effect on broader neurocognitive function needs more research.
- Ongoing innovation in surgical techniques holds promise for further reducing neurologic complications in CABG patients.
Abstract:
Neurologic injury, in the form of either stroke or more subtle neurocognitive impairment, is a frequent and potentially devastating complication of coronary artery bypass grafting (CABG). The etiology of CABG-associated neurologic injury is likely multifactorial, with the phenomena of cerebral hypoperfusion and embolism being the major contributors. Several perioperative strategies have been developed in an effort to reduce the incidence of CABG-associated neurologic complications. Hypothermic cerebral perfusion, alpha stat acid-base management, and slow patient rewarming have been shown by several investigators to minimize adverse neurologic sequelae associated with the use of cardiopulmonary bypass. Performing CABG without cardiopulmonary bypass (off-pump CABG), meanwhile, has been shown to reduce the risk of perioperative stroke, especially in high-risk patients such as the elderly. Whether off-pump CABG reduces the incidence of less severe neurocognitive impairment has not yet been clearly established and merits further investigation in the form of large, multicenter, randomized trials. Other technical innovations, such as the use of sutureless and clampless aortic anastomotic devices, also may be able to further minimize the neurologic complications associated with CABG.
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