Regional pressure differences between sites within the left ventricular cavity have long been identified,and the potential clinical value of diastolic and systolic intraventricular pressure differences(IVPDs)is of inc...Regional pressure differences between sites within the left ventricular cavity have long been identified,and the potential clinical value of diastolic and systolic intraventricular pressure differences(IVPDs)is of increasing interest.This study concluded that the IVPD plays an important role in ventricular filling and emptying and is a reliable indicator of ventricular relaxation,elastic recoil,diastolic pumping,and effective left ventricular filling.Relative pressure imaging,as a novel and potentially clinically applicable measure of left IVPDs,enables early and more comprehensive identification of the temporal and spatial characteristics of IVPD.In the future,as research related to relative pressure imaging continues,this measurement method has the possibility to become more refined and serve as an additional clinical aid that can replace the gold standard cardiac catheterization technique for the diagnosis of diastolic dysfunction.展开更多
目的:观察丹红注射液对大鼠急性心肌缺血的影响及机制。方法:30只大鼠随机分为模型组、丹红组及对照组,模型组及丹红组经舌下静脉注射垂体后叶素制作大鼠急性心肌缺血动物模型,对照组注射等体积生理盐水;丹红组造模后用丹红注射液4 m L/...目的:观察丹红注射液对大鼠急性心肌缺血的影响及机制。方法:30只大鼠随机分为模型组、丹红组及对照组,模型组及丹红组经舌下静脉注射垂体后叶素制作大鼠急性心肌缺血动物模型,对照组注射等体积生理盐水;丹红组造模后用丹红注射液4 m L/(kg·d)灌胃,对照组及模型组灌胃等量生理盐水,连续灌胃治疗14 d;分别于造模前15 min、造模后1.5 h及治疗第14天3个时点测定大鼠心肌丙二醛(MDA)和血清肌酸激酶(CK),并以直接测压法测定各组大鼠左心室内压最大上升速率(+LVdp/dtmax)及左室内压力峰值(LVSP),同时比较心肌缺血的情况。结果:经14 d治疗,丹红注射液明显降低大鼠MDA、CK,升高造模后+LVdp/dtmax、LVSP等心功能指标,缩小心肌缺血范围,与模型组比较,差异均有统计学意义(P<0.05)。结论:丹红注射液明显增加急性心肌缺血大鼠心肌收缩力进而改善大鼠心功能,对具有保护作用,可能与丹红注射液能清除或抑制大鼠急性心肌缺血后产生的氧自由基及脂质过氧化反应有关。展开更多
文摘Regional pressure differences between sites within the left ventricular cavity have long been identified,and the potential clinical value of diastolic and systolic intraventricular pressure differences(IVPDs)is of increasing interest.This study concluded that the IVPD plays an important role in ventricular filling and emptying and is a reliable indicator of ventricular relaxation,elastic recoil,diastolic pumping,and effective left ventricular filling.Relative pressure imaging,as a novel and potentially clinically applicable measure of left IVPDs,enables early and more comprehensive identification of the temporal and spatial characteristics of IVPD.In the future,as research related to relative pressure imaging continues,this measurement method has the possibility to become more refined and serve as an additional clinical aid that can replace the gold standard cardiac catheterization technique for the diagnosis of diastolic dysfunction.
