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Neutrophil leukotriene generation and pulmonary dysfunction after abdominal aortic aneurysm repair
D Gadaleta1, G A Fantini, M F Silane
1Department of Surgery, Cornell University Medical Center, New York, NY 10021.
Background:
The purpose of this study was to assess the role of polymorphonuclear neutrophil (PMN)-generated leukotriene B4 (LTB4) as an etiologic agent in the pulmonary dysfunction seen after operation in patients undergoing abdominal aortic aneurysm repair.
Methods:
Blood was analyzed in 10 consecutive patients undergoing elective infrarenal abdominal aortic aneurysm repair for plasma thromboxane B2, lactoferrin, C3a, and PMN-generated LTB4.
Results:
There was a close linear correlation (r = 0.88; p < 0.001) between aortic clamp time and PMN LTB4 production. Conversely, aortic clamp time and the ratio of arterial oxygen pressure to fraction of inspired oxygen, a measure of pulmonary function, were inversely related (r = -0.80; p < 0.008). PMNs from patients with long aortic cross-clamp times generated three times more LTB4 than those patients with short cross-clamp times (194 +/- 29.6 vs 64.9 +/- 9.7 ng per 5 x 10(6) PMN; p < 0.05). Similarly, the pressure/inspired oxygen ratio was significantly lower on admission to the intensive care unit in patients with long cross-clamp times as compared with patients with short cross-clamp times (237 +/- 14 vs 342 +/- 5; p < 0.005). In addition, patients with long cross-clamp times remained intubated longer than patients with short times (1.6 +/- 0.2 vs 0.6 +/- 0.4 days; p < 0.05).
Conclusions:
These data suggest a causal role for LTB4 in the generation of pulmonary dysfunction in patients undergoing abdominal aortic aneurysm repair, similar to what has been shown in animal models.
Insights
Polymorphonuclear neutrophil (PMN)-generated leukotriene B4 (LTB4) plays a key role in post-operative pulmonary dysfunction after abdominal aortic aneurysm repair. Higher LTB4 levels correlate with longer clamp times and poorer lung function outcomes.
Area of Science:
- Cardiovascular Surgery
- Pulmonary Medicine
- Inflammation Research
Background:
- Post-operative pulmonary dysfunction is a significant complication in patients undergoing abdominal aortic aneurysm (AAA) repair.
- The role of specific inflammatory mediators in this complication requires further elucidation.
Purpose of the Study:
- To investigate the involvement of polymorphonuclear neutrophil (PMN)-generated leukotriene B4 (LTB4) in the development of pulmonary dysfunction following AAA repair.
Main Methods:
- Analysis of plasma thromboxane B2, lactoferrin, C3a, and PMN-generated LTB4 in 10 patients undergoing elective infrarenal AAA repair.
- Correlation of these markers with aortic clamp time and pulmonary function (arterial oxygen pressure to fraction of inspired oxygen ratio).
Main Results:
- A strong positive correlation was observed between aortic clamp time and PMN-LTB4 production (r = 0.88, p < 0.001).
- Aortic clamp time was inversely related to pulmonary function (r = -0.80, p < 0.008).
- Patients with longer clamp times exhibited significantly higher LTB4 levels, lower oxygenation ratios, and longer intubation durations.
Conclusions:
- The findings suggest a causal link between LTB4 production and post-operative pulmonary dysfunction in AAA repair patients.
- LTB4 may be a critical mediator contributing to lung injury, mirroring findings in animal models.