长期雾化吸入硝酸甘油对高肺血流量大鼠肺动脉压力影响的研究

The effect of long-term nebulized inhalation of nitroglycerin on high pulmonary blood flow-induced pulmonary artery hypertension

目的 探讨长期雾化吸入硝酸甘油对高肺血流量所致大鼠肺动脉高压的作用。方法 2 4只健康♂Wistar大鼠随机分为对照组 (n =11)、分流组 (n =6 )和吸入组 (n =7)。对分流组和吸入组大鼠开腹行腹主动脉 下腔静脉分流术。12wk后分流组和吸入组大鼠分别雾化吸入生理盐水和硝酸甘油 3wk。以右心导管测定肺动脉压 (pulmonaryarterialpres sure ,PAP) ,颈动脉插管测定体循环压 (systemicarterialpres sure ,SAP)。检测右心室 /体重 (RV/BW)和右心室 /左心室 +室间隔 [RV/ (LV +S) ]比值 ,并且观测肺血管结构变化。结果 分流组大鼠肺动脉收缩压 (PASP)、RV/BW和RV/ (LV +S)明显高于对照组 (P <0 0 1) ,且分流组大鼠肺小血管肌化程度明显增强 (P <0 0 1)。吸入组大鼠SAP未受影响 ,PASP及PAMP明显低于分流组 (P <0 0 1) ,RV/BW和RV/ (LV +S)高于对照组 (P <0 0 1) ,但与分流组比较无差异 (P >0 0 1) ,吸入组大鼠肺小血管肌型动脉与分流组比较明显减少 ,肌化程度明显降低。

AIM To explore the effect of long-term nebulized inhalation of nitroglycerin (Neb-NTG) on high pulmonary blood flow-induced pulmonary artery hypertension (PAH). METHODS 24 male Wistar rats were randomly divided into shunting group, Neb group and control group. An arteries-venous shunt was performed between the abdominal aorta and inferior vena cava shunting was produced in rats of Neb and shunt groups. Twelve weeks after the operation, nebulized nitroglycerin was inhaled by rats in the Neb group using pressurized air ejection mobilization, while nebulized saline was inhaled by rats of the other two groups. Ten minutes inhalation was given each day for each rat. After three weeks of inhalation, pulmonary artery systolic pressure (PASP) and mean pressure (PAMP) of each rat were evaluated by using a right cardiac catheterization procedure. Systemic arterial pressure (SAP) was reorded continuously by catheterization procedure. The ratio of right ventricular mass to body weight (RV/BW) and the ratio of right ventricular mass to left ventricular plus septal mass (RV/LV+S) were detected. Pulmonary vascular microstructure was measured. RESULTS PASP, RV/BW and RV/LV+S were significantly increased in shunt rats as compared with those of normal controls (P<0.01, respectively). Muscularization of small pulmonary artery was obviously increased in shunt rats compared with controls. However, PASP and PAMP were significantly decreased in rats of Neb group compared with shunt group rats (P<0.01). SAP of Neb group was not affected, RV/BW and RV/LV+S of Neb group were significantly high than control group (P<0.01) and had no significant difference compared with shunt group (P>0.05). Muscularization of small pulmonary artery was obviously decreased in Neb-group compared with shunt group. CONCLUSION Long-term Neb-NTG ameliorates high pulmonary blood flow-induced PAH and pulmonary vascular remodeling.