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Applied neuromonitoring and improving CNS outcomes.

John M Murkin1

  • 1University of Western Ontario, London, Ontario, Canada. jmurkin@uwo.ca

Seminars in Cardiothoracic and Vascular Anesthesia
|May 28, 2005
PubMed
Summary

Coronary artery bypass graft (CABG) surgery can cause brain injury due to emboli or hypoperfusion. Neuromonitoring techniques significantly reduce these risks, improving patient outcomes and shortening hospital stays.

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Area of Science:

  • Neurology
  • Cardiovascular Surgery
  • Neuroscience

Background:

  • Coronary artery bypass graft (CABG) surgery is associated with central nervous system dysfunction, despite overall decreased perioperative risks.
  • Over 50% of cardiac surgery patients exhibit extracranial or intracranial atherosclerotic disease, impacting brain injury risk.
  • Cerebral embolization and ischemic hypoperfusion are primary causes of perioperative brain injury in cardiac surgery.

Purpose of the Study:

  • To review the mechanisms of perioperative brain injury during CABG surgery.
  • To highlight the role of monitoring techniques in mitigating neurological complications.
  • To demonstrate how neuromonitoring improves patient outcomes and reduces hospital stay.

Main Methods:

  • Review of preoperative patient factors, including atherosclerotic disease.
  • Analysis of etiologic mechanisms: cerebral embolization and ischemic hypoperfusion.
  • Evaluation of neuromonitoring techniques: epiaortic scanning, transcranial Doppler (TCD), and regional cerebral oxygen saturation (rSO2).

Main Results:

  • Epiaortic scanning reduces atheroembolic load and stroke risk.
  • TCD monitoring identifies and reduces microgaseous emboli.
  • Multimodality neuromonitoring detects cerebral hypoperfusion from various causes, improving outcomes.

Conclusions:

  • Patient-specific factors significantly influence brain injury risk after CABG.
  • Neuromonitoring techniques are crucial for decreasing intraoperative cerebral embolization and hypoperfusion.
  • Applied neuromonitoring improves overall patient outcomes and shortens hospital length of stay.

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