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Leukocyte depletion during cardiac operation: a new approach through the venous bypass circuit
1Department of Cardiothoracic Surgery, University Hospital Groningen, The Netherlands.
Insights
This study demonstrates a feasible method for leukocyte depletion during cardiac surgery using cardiopulmonary bypass. The technique effectively reduced circulating leukocytes and inflammatory markers, suggesting potential benefits for patient recovery.
Area of Science:
- Cardiovascular Surgery
- Immunology
- Biomedical Engineering
Background:
- Leukocyte depletion is used in cardiac surgery to reduce inflammation and organ injury.
- A novel method for systemic leukocyte depletion via the venous side of cardiopulmonary bypass (CPB) under low flow was evaluated.
Purpose of the Study:
- To assess the feasibility of a new leukocyte depletion technique during CPB.
- To evaluate the efficacy of this method in reducing circulating leukocytes and inflammatory responses in cardiac surgical patients.
Main Methods:
- Forty cardiac surgical patients were randomized into a leukocyte depletion group (n=20) and a control group (n=20).
- Leukocyte filtration occurred on the venous side of the CPB circuit using two filter sets, initiated during rewarming and before aortic cross-clamp release.
- Filtration was driven by a spare roller pump at a blood flow rate of 400 mL/min.
Main Results:
- The leukocyte depletion procedure was completed smoothly in 10 minutes with a mean removal rate of 69%.
- Circulating leukocytes decreased by 38% in the depletion group compared to controls at cross-clamp release (p<0.05).
- Postoperative interleukin-8 production was significantly reduced (p<0.05), indicating a lessened inflammatory response. No significant differences in PaO2 or pulmonary hemodynamics were observed.
Conclusions:
- Leukocyte depletion is technically feasible on the venous side of the CPB circuit at a low blood flow rate.
- Further research is needed to optimize the timing and duration of leukocyte depletion for cardiac surgical patients.
Background:
Leukocyte depletion recently has been introduced for cardiac surgical patients to attenuate leukocyte-mediated inflammation and organ reperfusion injury. We evaluated the feasibility of a new leukocyte depletion method in which systemic leukocyte depletion is achieved through the venous side of the cardiopulmonary bypass circuit under low blood flow.
Methods:
Forty cardiac surgical patients undergoing cardiopulmonary bypass were allocated randomly to a leukocyte depletion group (n = 20) and a control group (n = 20). In the depletion group, leukocyte filtration was achieved with two filter sets located between the venous drainage and the venous reservoir. Leukocyte filtration was commenced after the start of rewarming but before the release of the aortic cross-clamp, and it was driven by a spare roller pump of the heart-lung machine.
Results:
All the episodes of filtration went smoothly within a period of 10 minutes and with a blood flow rate of 400 mL/min. The mean leukocyte removal rate calculated at the end of filtration was 69%. Circulating leukocytes were reduced by 38% in the depletion group compared with the control group at the moment of cross-clamp release (4.3x10(9)/L versus 6.8x10(9)/L, p<0.05). The postoperative inflammatory response also was reduced as indicated by less production of interleukin-8 (p<0.05). Clinically, there was no significant difference between the two groups in postoperative PaO2 or pulmonary hemodynamics.
Conclusions:
It is technically feasible to deplete circulating leukocytes through the venous side of the cardiopulmonary bypass circuit with a low blood flow rate. Future studies should focus on the duration and timing of leukocyte depletion to optimize the methodology of leukocyte depletion for cardiac surgical patients.