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  • Title: [Effect of inhaling specific phosphodiesterase inhibitor on lung injury induced by cardiopulmonary bypass].
    Author: Guo HW, Wang WJ, Liao CX, Yang Q, Shan ZG, Qiu F, Chen JK.
    Journal: Zhonghua Yi Xue Za Zhi; 2011 May 31; 91(20):1401-4. PubMed ID: 21756812.
    Abstract:
    OBJECTIVE: To evaluate the effect of pretreatment by inhaling specific phosphodiesterase inhibitor on lung injury induced by cardiopulmonary bypass (CPB). METHODS: From April 2010 to November 2010, 30 patients were divided randomly into two groups: control group (n = 15) and milrinone group (n = 15). In milrinone group, 5 mg milrinone diluted by 5ml normal saline was inhaled per 8 h two days pre-operation. In control group, only 10 ml normal saline was inhaled. Blood samples were drawn from ulnar vein and radial artery pre-operation (T(0)), 30 min post-aortic unclamping (T(1)), at the end of operation (T(2)), 24 h, 72 h and 7 d post-operation (T(3)-T(5)). The following parameters were determined: TNF-α (tumor necrosis factor-alpha), IL-6 (interleukin-6), HSCRP (high-sensitivity C-reactive protein), MDA (malondialdehyde), MPO (myeloperoxidase) level and leucocyte count ratio of venous and arterial blood. And the values of pulmonary vascular resistance (PVR) and oxygenation index (OI) were measured through a Swan-Ganz catheter at the first 5 time points. RESULTS: PVR rose while OI declined at post-operation. But the range of above-mentioned indices in milrinone group was significantly smaller than that in control group. And the indices recovered much earlier in milrinone group. The levels of TNF-α, IL-6, HSCRP, MDA, MPO and leucocyte count ratio were not significantly different at T(0) between two groups and increased significantly after CPB in both groups. But the level of TNF-α (ng/L) was significantly lower at T(2), T(4), T(5) in milrinone group than that in control group (60 ± 5 vs 79 ± 7, 29 ± 6 vs 40 ± 8, 18 ± 5 vs 28 ± 7, all P < 0.05). The levels of IL-6 and MDA were significantly lower at T(1)-T(4) in milrinone group. The level of HSCRP became elevated post-operatively in both groups and reached its peak at 24 h post-operation, especially in control group. The level of MPO (µg/L) was significantly lower at T(2), T(3) and T(5) (134 ± 20 vs 190 ± 23, 142 ± 28 vs 178 ± 20, 65 ± 9 vs 75 ± 11, all P < 0.05). And the V/A ratio was significantly lower at T(1)-T(3) in milrinone group than in control group (1.12 ± 0.11 vs 1.37 ± 0.09, 1.07 ± 0.07 vs 1.25 ± 0.07, both P < 0.01). CONCLUSION: Inhaled milrinone may protect the lungs from acute injury induced by CPB. Inhaling milrinone is safe and feasible for the prevention of acute CPB-induced injury.
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