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Continuous pulmonary perfusion during cardiopulmonary bypass prevents lung injury in infants
1Division of Cardiovascular Surgery, Tokyo Metropolitan Children's Hospital, Japan. suzuki@chp.kiyose.tokyo.jp
Insights
Continuous pulmonary perfusion during cardiopulmonary bypass effectively prevents lung injury in infants with congenital heart disease and pulmonary hypertension. This method improves oxygenation and reduces the need for postoperative ventilation.
Area of Science:
- Pediatric Cardiology
- Thoracic Surgery
- Critical Care Medicine
Background:
- Infants with congenital heart disease and pulmonary hypertension face lung injury risks post-cardiopulmonary bypass.
- Neutrophil sequestration in the lungs after reestablishing pulmonary circulation is a key factor in this injury.
Purpose of the Study:
- To investigate the efficacy of continuous pulmonary perfusion in preventing lung injury during cardiopulmonary bypass in infants.
- To compare lung injury markers between infants receiving continuous pulmonary perfusion and those undergoing conventional cardiopulmonary bypass.
Main Methods:
- Thirty infants with septal defects and pulmonary hypertension were divided into two groups: continuous pulmonary perfusion (16) and conventional cardiopulmonary bypass (14).
- Arterial blood gas (PaO2/FiO2) and neutrophil counts were monitored before and up to 24 hours after cardiopulmonary bypass.
Main Results:
- The continuous pulmonary perfusion group showed significantly higher PaO2/FiO2 ratios throughout the study period.
- Neutrophil counts decreased post-bypass, with a significant decrease in the conventional group but not the perfused group.
- Postoperative ventilatory support duration was significantly shorter in the continuous pulmonary perfusion group.
Conclusions:
- Arrested pulmonary circulation during cardiopulmonary bypass is a primary risk factor for infant lung injury.
- Continuous pulmonary perfusion is an effective strategy to mitigate lung injury in this vulnerable patient population.
Background:
Lung injury after cardiopulmonary bypass is a serious complication for infants with congenital heart disease and pulmonary hypertension. Excessive neutrophil sequestration in the lung occurring after reestablishment of pulmonary circulation implies that interaction between neutrophils and pulmonary endothelium is the major cause of lung injury.
Methods:
Thirty infants with either ventricular septal defect or atrioventricular septal defect and with pulmonary hypertension were enrolled in this study. We performed continuous pulmonary perfusion during total cardiopulmonary bypass on 16 patients (perfused group) and conventional cardiopulmonary bypass on 14 patients (control group). PaO2/FiO2 and neutrophil counts were assessed from immediately before surgery to 24 hours after termination of cardiopulmonary bypass.
Results:
PaO2/FiO2 was higher in the perfused group than in the control group, and the difference was significant throughout the study period. Neutrophil counts decreased below prebypass values in both groups at 30 minutes after aortic unclamping, and the difference was significant in the control group but was not in the perfused group. Duration of postoperative ventilatory support was significantly less in the perfused group.
Conclusions:
Our study demonstrates that arrested pulmonary circulation during cardiopulmonary bypass is the major risk factor of lung injury and that continuous pulmonary perfusion is effective in preventing lung injury.