含L-精氨酸氧合温血肺动脉持续灌注对肺组织的保护作用

目的 体外循环(CPB)期间观察肺动脉持续灌注氧合血及氧合血内加入L-精氨酸对肺组织的保护作用.方法 45例择期常规行二尖瓣置换术病人纳入临床对照研究,随机分成对照组,常规体外循环;灌注组,肺动脉持续灌注氧合血;加药组,肺动脉持续灌注含L-精氨酸(200 mg/kg)的氧合血;每组各15例.3组病人均采用常规CPB,灌注组和加药组从肺动脉根部持续灌注氧合血至CPB开放主动脉结束.分别在麻醉后、开放主动脉1 h,回ICU 0、6、12、24 h取桡动脉血,采用双抗体夹心酶联免疫吸附试验(ELISA法)测定肿瘤坏死因子(TNF-α)、白细胞介素6(IL-6)、白细胞介素10(IL-10)的表达.征得病人本人及家属同意,于CPB前及停机后30min取1.0 cm×1.0cm×1.0cm右下肺组织.光镜观察肺组织结构变化.结果 45例术中及术后经过顺利,均痊愈出院.开放主动脉后,加药组和灌注组血浆中TNF-α、IL-6水平明显低于对照组(P<0.05),加药组优于灌注组;IL-10水平高于对照组,加药组优于灌注组.对照组光镜下见肺泡间质水肿,肺泡内大量中性粒细胞渗出,细胞核碎裂;灌注组肺泡毛细血管轻度充血,肺间质淋巴细胞浸润;加药组基本保持了正常的肺组织结构.结论 CPB期间持续肺动脉灌注氧合血对肺组织有保护作用;L-精氨酸对肺组织也有保护作用.

Clinical study on the effect of continuous pulmonary artery perfusion with wxygenated warm blood containing L-arginine on lung injury during cardiopulmonary bypass

Objective To evaluate the protective effect on lung by using continuous pulmonary artery perfusion with oxygenated blood and L-arginine during cardiopulmonary bypass(CPB).Methods Forty five cases received mitral valve replacement were randomly divided into 3 groups and each group involved 15 cases. Group I(control group), patients received routine procedure of CPB. Proup Ⅱ, patients received rcontinuous pulmonary artery perfusion with oxygenated blood. Group Ⅲ,continuous pulmonary artery perfusion with oxygenated blood containing L-arginine (200 mg/kg) (n=15). All cases received routine procedure of CPB and continuously infused from the root of pulmonary artery until releasing aortaoaic clamp. Blood samples were collected from the radial artery respectively at the following time points:after the induction of anaesthesia, 1 hour after opening of aorta, 0, 6, 12, 24 hours after patients being taken back to ICU. ELISA test was used to detected the expression of tmmor necrosis factor-α(TNF-α), interleukin-6 (IL-6) and interleukin-10 (IL-10). Lung tissue samples (1.0 cm ×1.0 cm×1.0 cm) were obtained from right lower lobe. The pathologicl changes of lung tissues were observed under light mi-croscope by using HE staining. Results at each time points, the expression of TNF-α, IL-6 in group Ⅱ and group Ⅲ weresignificantly lower than that in group Ⅰ (P<0.05). The level of TNF-α, IL-6 in group Ⅲ were lower than in group Ⅱ(P<0.05). However, the expression of IL-10 in group Ⅱ and group Ⅲ were higher than in group Ⅰ, and the level of IL-10 in group Ⅲ were higher than that in group Ⅱ(P<0.05). In the group Ⅰ: HE staining showed marked pulmonary interstitial edema, intra-alveolus neutrophilic granulocyte exudation with karyorrhexis. In the group Ⅱ, light capillary vessel hyperaemia and pulmonary interstitial lymphocyte exudation were detected. Nearly normal lung tissue were observed in group Ⅲ. Conclusion Continuous pulmonary artery perfusion with oxygenated blood and L-arginine could inhibit the synthesis of inflammatory factors significantly and increase the releasing of anti-inflammatory factors during CPB. Therefore, it may reduces pulmonary inflammatory reaction and have protective effects on lung tissue.