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速度矢量成像定量评价不同PTH水平尿毒症患者左心功能的研究
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摘要
研究背景:在临床上尿毒症患者多死于尿毒症心肌病。近几年来发现,甲状旁腺素(PTH)功能亢进在其中起着重要作用。国内外研究都表明PTH>正常值上限3倍的患者有明显的心肌损害加重趋势,但常规二维超声心动图只能估测整体心脏运动,不能显示不同节段早期心肌功能不全。新近发展起来的速度矢量成像(VelocityVector Imaging,VVI)技术克服了周围心肌牵拉和心脏整体运动的干扰及角度依赖性,能准确有效地评价局部心肌功能。目前国内外尚无用VVI评价不同PTH水平的尿毒症患者左心局部心肌功能的研究报道。
     目的:利用VVI技术定量评价PTH<正常值上限3倍患者、PTH>正常值上限3倍患者左心长轴各节段的心肌功能,与正常人比较,观察其变化特点;观察PTH<正常值上限3倍患者、PTH>正常值上限3倍患者左心室各节段收缩功能与舒张功能的改变先后;探讨VVI技术在评价不同PTH水平的尿毒症患者左心长轴功能无创估测中的价值。
     对象及方法:2007年6月~2008年2月在我院血液净化中心进行维持性血液透析(MHD)、完全符合尿毒症标准的患者60例,根据超声心动图检查前一周内抽血清测得PTH值大小,将实验组对象分成A、B两组,A组<正常值上限3倍,B组>正常值上限3倍(我院PTH正常值为1.48~7.63pmol/L),每组各30例。按性别、年龄与A、B组患者匹配的正常人30例。凡既往有高血压、瓣膜性心脏病、先天性心脏病史,经检查有糖尿病、甲状腺疾病、代谢性疾病、结缔组织疾病、营养不良、有严重的肝功能损害者,有酗酒和毒物接触史者,处于围生期者均排除在外。用VVI技术分别测量16节段心肌长轴上三组指标:Ⅰ—收缩期峰值应变率(SSRmax);Ⅱ—舒张期峰值应变率(DSRmax);Ⅲ—应变率达峰时间(PTSR);每一指标均取一个心动周期。
     结果:正常组收缩期应变率、舒张期应变率在基底段、中间段、心尖段无明显差异,应变率达峰时间在16个节段的一致性较好。与正常组比较,A组患者左室心肌长轴方向下壁及后间壁的基底段、中间段、心尖段,前间壁的基底段、中间段,侧壁及前壁的心尖段,后壁的中间段的SSRmax减低,差异有显著性意义(p<0.05);B组各节段SSR均减低,差异有显著性或极显著性意义(P<0.05或P<0.01)。A、B两组所有节段的DSRmax测值均减低,PTSR测值均延长,差异均具有显著性意义(A组p<0.05,B组p<0.01)。与A组患者比较,B组患者前壁的基底段、中间段、心尖段,后间隔、下壁的中间段、心尖段,前间壁、后壁的中间段,侧壁的心尖段的SSRmax测值减低,差异有显著性意义(p<0.05);B组患者所有节段的DSRmax测值均减低,PTSR测值均延长,差异均具有显著性意义(p<0.05)。
     结论:与正常对照组相比,两组患者的所有节段心肌的舒张功能减退,不同节段心肌的收缩功能发生不同程度的减退,说明心肌的舒张功能障碍发生在收缩功能障碍之前,且PTH不但对心肌整体结构功能产生损害,还对不同节段心肌产生不同程度损伤;另外B组的损伤程度较A组严重,说明了PTH水平越高,对心肌结构功能的损害程度越严重。VVI技术的应用能够早期、客观、准确的发现患者长轴方向心肌舒缩功能的微小变化,为PTH对心肌的损害提供了客观、定量的理论依据。相信随着对VVI技术进一步深入的研究,以及对应变率这一参数特性的掌握,将使这项技术在不久后广泛运用于临床工作中。
Backgroud:Most of uremic patients died of uremic cardiomyopathy. Recently we found secondary hyperparathyroidism is a important role. Scholars at home and abroad have found there were much more injury on myocardium of uremic patients with PTH more than 3 times of upper normal limnit.But the routine technique of ECHO could only estimate the global heart movement and could not evaluate effectively local myocardium movement damaged by different quantity of PTH.Recently developed new technique-Velocity Vector Imaging(VVI)can conquer the angle-dependency,the drag of surrounding myocardial and interference of the global heart movement and can estimate exactly regional myocardium function.No scholars at home and abroad had studied the the left ventricular longitudinal function in uremic patients with differnent quantity of PTH.
     Objective:To investigate the regional longitudinal contraction and relaxation of left ventricle in patients with differnent quantity of PTH,compared with normal persons,characterize the regularity of left ventricular longitudinal function;To characterize change sequence of systolic function and diastolic function in uremic patients with different quantity of PTH.To discuss the important clinical value of velocity vector imaging in quantitatively evaluating regional longitudinal function of left ventricle.
     Methods:60 patients diagnosed uremia were divided into 2 groups according to the value of PTH(1.48~7.63pmol/L):Group A is 30 patients with PTH less than 3 times of upper normal limit,Group B is 30 patients with PTH more than 3 times of upper normal limnit.Normal control group is 30 healthy people.They were matched with for sex and age.Exclusion criteria for all subjects were HBP,cardiac valve disease, congenital heart disease,Diabetes mellitus,thyroid disease,metabolic disease,connective tissue disease,dystrophy,severe dysfunction of liver and kidney,contact of toxic,alcohol abuse,pregnant woman in perinatal period.All people were evaluated by Velocity Vector Imaging. Get indexs below in 16 segments from 1 heart beat respectively to assess left ventricular longitudinal contraction and relaxation:Ⅰ-systolic max strain rate(SSRmax);Ⅱ-diastolic max strain rate(DSRmax);Ⅲ-peak time of strain rate(PTSR).
     Results:The SSRmax and DSRmax were not obvious different from the base to apex in normal group.PTSR had good coherence among 16 myocardium segments in normal group.Compared with normal group,in group A,SSRmax in base、medium and apex of posterior septum wall and superior wall,base and medium of anterior septum wall,apex of laternal and anterior wall,medium of posterior wall wall were significantly lower(P<0.05);SSRmax in group B were significantly lower(P<0.05 or 0.01).In all patients,all segments' DSRmax were significantly lower,PTSR were significantly longer(Group A p<0.05, Group B p<0.01).Compared with Group A,SSRmax in group B,apex of laternal wall,medium of anterior septum wall、posterior wall,medium and apex of posterior septum wall and superior wall,base、medium and apex of anterior wall were significantly lower(P<0.05);In group B all segments' DSRmax were significantly lower,PTSR were significantly longer(P<0.05).
     Conclusion:All segments' relaxation and coherence were obvious decrease,different segments' contraction were decrease in varing degree,proving the dysfunction of relaxation happen before contraction,and PTH injury not only the global heart movement,but aslo local myocardium movement.In addition,the higher the PTH,the much worse the local cardiomyopathy function.VVI is another viable objective tool to quantitatively assess LV segmental function damaged by different quantity of PTH.It proved that myocardium is damaged by PTH with varing degree.
引文
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