摘要目的:应用超声心动图评估西那卡塞对野百合碱(MCT)诱导的动脉性肺动脉高压(PAH)大鼠右心结构功能的影响。方法:30只雄性SD大鼠随机分为对照组、PAH组、西那卡塞组，每组10只。西那卡塞组给予盐酸西那卡塞30 mg/kg腹腔注射，对照组和PAH组分别予以等体积溶剂。超声心动图参数：右室壁厚度(RVWT)、右室基底段内径(RVD)、左室偏心指数(EI)、三尖瓣环收缩期位移(TAPSE) 、右室面积变化分数(RVFAC)、三尖瓣环收缩期峰值速度(s′)、右室四腔纵向应变(RV4CSL)及右室游离壁纵向应变(RVFWSL)等。组织病理学参数：肺小动脉管壁厚度(WT)、右室心肌细胞直径(RV cell-D)、胶原体积分数(CVF)及右室肥厚指数(RVI)。比较各组间超声及病理学参数，分析右室病理改变与超声应变参数间的相关性。结果:①与对照组相比，PAH组WT、RV cell-D、CVF及RVI增加(均 P<0.01)，右心增大、右室肥厚(均 P<0.05)，右室纵向应变减低( P<0.01)。②与PAH组相比，西那卡塞组WT、RV cell-D、CVF及RVI减低(均 P<0.01)，右室结构功能改善(均 P<0.05)；上述参数与对照组比较差异无统计学意义(均 P>0.05)。③相关性分析：右室重构参数CVF、RV cell-D与WT呈正相关( rs＝0.706 3，0.629 4；均 P<0.05)；RVFWSL与CVF、RV cell-D间具有良好相关性( rs＝－0.685 3， r＝－0.767 2；均 P<0.05)。 结论:西那卡塞干预的PAH大鼠右室逆重构，功能得以保留，提示西那卡塞对PAH大鼠右室结构、功能具有保护作用。

abstractsObjective:To evaluate the effect of cinacalcet on right ventricular function in rats with MCT-induced arterial pulmonary hypertension by echocardiography.Methods:Thirty male SD rats were randomly divided into control group, PAH group, and cinacalcet group, with 10 rats in each group. Rats in the cinacalcet group were given intraperitoneal injection of cinacalcet hydrochloride with 30 mg/kg, and the control group and the PAH group were given equal-volume of solvent. Echocardiographic parameters: right ventricular wall thickness (RVWT), right ventricular basal dimension (RVD), left ventricular eccentricity index (EI), tricuspid annular plane systolic excursion (TAPSE), right ventricular fractional area change (RVFAC), tricuspid lateral annular systolic velocity (s′), right ventricular global longitudinal strain (RV4CSL), and right ventricular free wall longitudinal strain (RVFWSL), etc. Histopathological parameters: pulmonary arteriole wall thickness (WT), right ventricular cardiomyocyte mean diameter (RV cell-D), collagen volume fraction (CVF) and right ventricular hypertrophy index (RVI). Echocardiographic and pathological parameters were compared among three groups, and the correlation between right ventricular pathological changes and strain parameters was analyzed.Results:①Compared with the control group, WT, RV cell-D, CVF and RVI in PAH group were increased (all P<0.01), the size of right ventricle and thickness of RV wall were increased (all P<0.05), and the right ventricular longitudinal strain was reduced ( P<0.01). ②Compared with the PAH group, rats in the cinacalcet group showed reduced WT, RV cell-D, CVF and RVI (all P<0.01), as well as improved structure and function of the right ventricle (all P<0.05). There was no statistical difference of the above parameters between cinacalcet and control group (all P>0.05). ③Correlation analysis: the right chamber remodeling parameters CVF and RV cell-D were positively correlated with WT ( rs=0.706 3, 0.629 4; both P<0.05); and RVFWSL correlated well with CVF, RV cell-D ( rs=-0.685 3, r=-0.767 2; both P<0.05). Conclusions:The right ventricular inverse remodeling of PAH rats with the intervention of cinacalcet was retained, suggesting that cinacalcet had a protective effect on the structure and function of the right ventricle in rats with PAH.