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Off-pump coronary bypass operations significantly reduce S100 release: an indicator for less cerebral damage?
W Wandschneider1, M Thalmann, E Trampitsch
1Department of Cardiothoracic Surgery, Institute for Laboratory Medicine, General Hospital Klagenfurt, Austria. wwand@netway.at
The Annals of Thoracic Surgery
|November 28, 2000
Summary
Off-pump cardiac surgery using beating heart revascularization significantly reduces cerebral injury compared to traditional extracorporeal circulation. This approach minimizes S100 protein release, a marker of brain damage, indicating improved patient outcomes.
Area of Science:
- Cardiovascular Surgery
- Neurology
- Biomarkers
Background:
- Cardiac operations utilizing extracorporeal circulation (ECC) are associated with a risk of cerebral complications.
- Cerebral impairment following cardiac surgery can lead to significant patient morbidity.
Purpose of the Study:
- To investigate whether off-pump coronary artery bypass grafting (CABG) without heart-lung machines reduces perioperative cerebral injury.
- To compare cerebral S100 protein levels between patients undergoing on-pump versus off-pump cardiac surgery.
Main Methods:
- A randomized study involving 108 patients undergoing CABG.
- Group A (n=67) underwent conventional CABG with ECC and cardioplegic arrest.
- Group B (n=41) underwent off-pump beating heart revascularization.
- S100 protein levels, a marker for cerebral tissue damage, were measured from anesthesia induction to 24 hours post-operation.
Main Results:
- No in-hospital deaths or significant neurological deficits were observed in either group.
- Patients undergoing off-pump surgery (Group B) showed only slight increases in S100 levels.
- Patients undergoing on-pump surgery (Group A) exhibited a sharp rise in S100 levels, peaking four times higher than Group B (2.1 microg/L vs. 0.5 microg/L; p < 0.001).
Conclusions:
- Perioperative cerebral impairment is reduced in cardiac operations performed without extracorporeal circulation.
- Off-pump beating heart surgery demonstrates a potential benefit in mitigating brain injury during CABG.
- Further large-scale studies are warranted to confirm if these findings translate to reduced neurological deficits.