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Pulmonary function after biventricular bypass for autologous lung oxygenation.
N Mendler1, W Heimisch, H Schad
1German Heart Center Munich, Department of Cardiac Surgery, Lazarettstrasse 36, D-80636, Munich, Germany. mendler@dhm.mhn.de
Summary
Biventricular bypass (BVB) preserves lung function better than heart-lung bypass (HLB) by reducing lung injury and improving gas exchange. This study shows BVB is a superior strategy for patients with compromised lung function.
Area of Science:
- Cardiovascular Surgery
- Pulmonary Physiology
- Extracorporeal Circulation
Background:
- Heart-lung bypass (HLB) can induce systemic inflammatory response and lung injury.
- Biventricular bypass (BVB) aims to mitigate these effects by utilizing the autologous lung for gas exchange, eliminating the need for an artificial oxygenator.
Purpose of the Study:
- To compare the effects of BVB with autologous lung perfusion versus conventional HLB on pulmonary function parameters in an experimental model.
- To evaluate the potential of BVB in preserving lung integrity during and after extracorporeal circulation.
Main Methods:
- A 120-minute cardiopulmonary bypass was performed in 12 mongrel dogs, alternating between HLB and BVB.
- Pulmonary and systemic hemodynamics, extravascular lung water (EVLW), gas exchange, lung compliance (PC), and ventilation (RMV) were measured.
- Blood cell counts (Leuco, Thrombo) were also analyzed.
Main Results:
- BVB demonstrated significantly lower increases in pulmonary vascular resistance (PVR) and EVLW compared to HLB.
- BVB resulted in better preservation of lung compliance (PC), oxygenation (PaO2), and ventilation (RMV).
- BVB also showed less reduction in leukocyte and platelet counts compared to HLB.
Conclusions:
- HLB leads to significant ischemia-reperfusion injury in the lungs, evidenced by edema, cell trapping, and impaired gas exchange.
- BVB offers superior protection of pulmonary mechanics and function compared to HLB.
- These findings support the clinical application of BVB in patients with pre-existing lung dysfunction.