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Heparin-coated circuits reduce occult myocardial damage during CPB: a randomized, single blind clinical trial
Insights
Heparin-coated circuits reduce neutrophil activation and lipid peroxidation during open-heart surgery, leading to less myocardial damage. This biocompatible approach improves outcomes in patients undergoing cardiopulmonary bypass.
Area of Science:
- Cardiovascular Surgery
- Biomaterials Science
- Inflammation Research
Background:
- Cardiopulmonary bypass (CPB) triggers a systemic inflammatory response, increasing morbidity like organ dysfunction and bleeding.
- Heparin-coated circuits show potential for reducing inflammation and improving clinical outcomes in open-heart surgery.
- The impact of heparin-coated circuits on lipid peroxidation, neutrophil activation, and myocardial damage in humans remains unclear.
Purpose of the Study:
- To investigate the effects of heparin-coated CPB circuits on lipid peroxidation, neutrophil activation, and myocardial ischemic damage.
- To compare inflammatory markers and cardiac enzyme levels between patients undergoing open-heart surgery with heparin-coated versus non-heparin-coated CPB circuits.
Main Methods:
- A randomized, single-blind trial involving 39 patients undergoing open-heart surgery.
- Patients were divided into two groups: CPB with heparin-coated circuits (n=20) and without (n=19).
- Measurements included complement activation, neutrophil counts, malondialdehyde (MDA), and cardiac enzymes (CK-MB).
Main Results:
- Neutrophil levels and MDA (lipid peroxidation marker) were significantly lower in the heparin-coated group after reperfusion (P<0.0001).
- Significant positive correlations were observed between MDA levels, neutrophil counts, and CK-MB (cardiac enzyme).
- Complement factors and cardiac enzyme levels increased in both groups during bypass but showed no significant intergroup differences.
Conclusions:
- Heparin-coated circuits significantly decreased neutrophil response and malondialdehyde levels.
- Findings suggest neutrophil activation contributes to lipid peroxidation, potentially influencing myocardial damage.
- Heparin coating enhances biocompatibility, reducing occult myocardial ischemic damage in open-heart surgery patients.
Objectives:
Cardiopulmonary bypass is associated with a diffuse systemic inflammatory response that can cause considerable morbidity, including organ dysfunction and bleeding. Heparin-coated circuits have been shown to give a reduced inflammatory response with clinical benefits during open-heart surgery. However, the effects on lipid peroxidation, neutrophil activation and myocardial ischemic damage in the human have remained unknown.
Methods:
In a randomized single blind trial, complement activation, neutrophil counts, malondialdehyde, and cardiac enzymes were studied in 39 patients undergoing open-heart surgery. Two groups were perfused with cardiopulmonary bypass circuits with (n=20) or without heparin-coating (n=19).
Results:
The different complement factors (C3, C4, C3d, C3d/C3 and the C-function), neutrophil levels, MDA and the cardiac enzyme levels were comparable before CPB was started and significantly increased in both groups during bypass. There were significant intergroup differences in the neutrophil levels and MDA after reperfusion (P<0.0001). Furthermore, significant positive correlations between the lipid peroxidation, expressed as MDA levels, and the levels of neutrofils and the cardiac enzyme, CK-MB were seen within the groups.
Conclusions:
Heparin coated circuits did lead to a decreased neutrophil response and MDA level. The correlations between CK-MB and neutrophil and MDA levels suggest neutrophil activation leading to lipid peroxidation that may influence myocardial damage. Heparin coating improved biocompatibility and was associated with less occult myocardial ischemic damage in patients undergoing open heart surgery.