心肌超声造影心动图联合斑点追踪成像评价2-氨基乙氧基二苯基硼酸酯对砷中毒大鼠心脏保护作用

Myocardial contrast echocardiography combined with speckle tracking imaging for evaluating protective effect of 2-aminoethoxydiphenyl borate on heart of arsenic poisoned rats

目的观察心肌超声造影心动图(MCE)联合斑点追踪成像(STI)评价2-氨基乙氧基二苯基硼酸酯(2-APB)对砷中毒大鼠心脏保护作用的价值。方法将40只大鼠随机分为三氧化二砷(ATO)中毒后低剂量2-APB干预组(2-APB_(L)组)、ATO中毒后高剂量2-APB干预组(2-APB H组)、单纯ATO中毒组(ATO组)、单纯2-APB干预组(2-APB组)及对照组,每组8只。对2-APB_(L)组、2-APB H组及ATO组均经腹腔注射ATO 5 mg/kg体质量,对2-APB组和对照组注射等量生理盐水;之后分别以2、4、4 mg/kg体质量对2-APB_(L)组、2-APB H组和2-APB组注射2-APB,对ATO组和对照组注射等量生理盐水;行MCE及STI检查,检测血清心肌损伤标志物及心肌肌浆网Ca^(2+)-ATP酶(SERCA);最后行心肌病理学检查。观察组间各参数差异,并行相关性分析。结果5组左心室短轴缩短率(LVFS)、左心室射血分数(LVEF)、曲线上升斜率(WIS)、峰值信号强度(PI)、WIS×PI、曲线下面积(AUC)、各层心肌整体圆周应变(GCS)及谷草转氨酶(GOT)、肌酸激酶(CK)、乳酸脱氢酶(LDH)、SERCA差异均有统计学意义(P均<0.05),且基本依ATO组、2-APB_(L)组、2-APB H组、2-APB组/对照组次序递增或递减(P均<0.05)。WIS、PI、WIS×PI、心内膜下心肌GCS、中层心肌GCS、心外膜下心肌GCS均与SERCA呈正相关(r=0.874、0.893、0.920、0.916、0.848、0.783,P均<0.05)。结论MCE联合STI、尤其WIS×PI和心内膜下心肌GCS可用于评估2-APB对砷中毒大鼠心脏的保护作用。

Objective To observe the value of myocardial contrast echocardiography(MCE)combined with speckle tracking imaging(STI)for evaluating the protective effect of 2-aminoethoxydiphenyl borate(2-APB)on heart of arsenic poisoned rats.Methods Forty rats were randomly divided into low-and high-dose 2-APB intervention after arsenic trioxide(ATO)poisoned group(2-APB_(L) group and 2-APB H group),simple ATO poisoned group(ATO group),simple 2-APB intervention group(2-APB group)and control group(each n=8).5 mg/kg ATO were intraperitoneally injected in 2-APB_(L) group,2-APB H group and ATO group,while equal dose physiological saline were injected in 2-APB group and control group,respectively.Then 2,4 and 4 mg/kg 2-APB were intraperitoneally injected in 2-APB_(L) group,2-APB H group and 2-APB group,while equal doses physiological saline were injected in ATO group and control group,respectively.MCE and STI were performed,serum myocardial injury markers were tested,sarcoplasmic reticulum Ca^(2+)-ATPase(SERCA)was examinated,and finally myocardial pathological examination was performed.The above indexes were compared among groups and between each 2 groups,and correlation analysis was performed.Results Significant differences of left ventricular fractional shortening(LVFS),left ventricular ejection fraction(LVEF),wash in slope(WIS),peak intensity(PI),WIS×PI,area under the curve(AUC),global circumferential strain(GCS)in each layer of myocardium,as well as glutamic-oxaloacetic transaminase(GOT),creatine kinase(CK),lactate dehydrogenase(LDH)and SERCA were found among 5 groups(all P<0.05).The above indexes substantially increased or decreased sequentially ATO group,2-APB_(L) group,2-APB H group and 2-APB group/control group(all P<0.05).WIS,PI,WIS×PI and GCS of rat endo-myocardium,GSC of mid-myocardium and GCS of epi-myocardium all positively correlated with SERCA(r=0.874,0.893,0.920,0.916,0.848,0.783,all P<0.05).Conclusion MCE combined with STI,especially WIS×PI and GCS of endo-myocardium could be used to evaluate the protective effect of 2-APB on heart of arsenic poisoned rats.