Objective: Ischemic conditioning (IC) limits myocyte necrosis after acute myocardial ischemia-reperfusion;however, controversy persists regarding its potential to attenuate LV contractile dysfunction. Pressure-volume ...Objective: Ischemic conditioning (IC) limits myocyte necrosis after acute myocardial ischemia-reperfusion;however, controversy persists regarding its potential to attenuate LV contractile dysfunction. Pressure-volume (P-V) loop analysis, via the load-insensitive conductance catheter method, was used to evaluate LV contractility, diastolic function, and ventriculo-arterial coupling. The goal of this study was to evaluate the ability of IC to improve post-ischemic recovery of LV contractile function. Methods: Twelve anesthetized dogs were randomly distributed to either the IC or the non-IC group;all dogs were subject to 60-min acute coronary occlusion followed by 180-min reperfusion. IC consisted of 4 repeated cycles of 5-min occlusion and 5-min reperfusion of the left main coronary artery. LV P-V relations were constructed under steady-state conditions (by inferior vena cava occlusion) at the beginning and end of the experiments;P-V loops were acquired at different time points before and during ischemia-reperfusion. Results: During ischemia and reperfusion, dP/dt<sub>max</sub> decreased significantly compared to baseline in both groups;dP/dt<sub>min</sub>, an indicator of the rate of LV relaxation rate was not affected for either group. Significant changes in several parameters of LV function including LVEF, SW, tPFR, ESV, and EDV caused by ischemia were also identified;none of these negative effects were resorbed, even in part, during reperfusion. Conclusions: Diminished LV contractile efficiency during systole and diastole produced by ischemia-reperfusion did not improve with IC pre-treatment despite significant endogenous protection against tissue necrosis.展开更多
To identify whether plasma Calcitonin gene-related peptide （CGRP） level isindexe for evaluating early cardiac dysfunction in patients with coronaryartery disease.Normal and coronary artery disease total sixty cases ...To identify whether plasma Calcitonin gene-related peptide （CGRP） level isindexe for evaluating early cardiac dysfunction in patients with coronaryartery disease.Normal and coronary artery disease total sixty cases werechosen at random,which were diagnosed by coronary arteriography,foursubgroups （0,1,2,3 lesion branch group） were divided basing on coronaryartery lesion branch,each having fifteen cases.hemodynamic parameters weremeasured by left cardiac cather and left ventricular cineangiography,plasmaCGRP concentration was msaured by radioimmunoassay.results reveal:LVEFdecressed as coronary artery lesion branch increased,but there were nosignificantly difference between subgroups (only P<sub>sio</sub>【0.05);there weresignificantly difference of diastolic function parameters between subgroups,especially T,bad positive relativity to stenosis score （r=0.72,P【0.01）.Plasma CGRP level had positive relativity to stenosis score,time constant（r=0.37～0.38,P【0.05）;bad negative relativity to LVEF （r=-0,46,P【0.01）.in brief,Coronary artery disease imparies diastolic function prior tosystolic function;CGRP is a important index for evaluating early cardiacdysfunction in patients with coronary artery disease.展开更多
文摘Objective: Ischemic conditioning (IC) limits myocyte necrosis after acute myocardial ischemia-reperfusion;however, controversy persists regarding its potential to attenuate LV contractile dysfunction. Pressure-volume (P-V) loop analysis, via the load-insensitive conductance catheter method, was used to evaluate LV contractility, diastolic function, and ventriculo-arterial coupling. The goal of this study was to evaluate the ability of IC to improve post-ischemic recovery of LV contractile function. Methods: Twelve anesthetized dogs were randomly distributed to either the IC or the non-IC group;all dogs were subject to 60-min acute coronary occlusion followed by 180-min reperfusion. IC consisted of 4 repeated cycles of 5-min occlusion and 5-min reperfusion of the left main coronary artery. LV P-V relations were constructed under steady-state conditions (by inferior vena cava occlusion) at the beginning and end of the experiments;P-V loops were acquired at different time points before and during ischemia-reperfusion. Results: During ischemia and reperfusion, dP/dt<sub>max</sub> decreased significantly compared to baseline in both groups;dP/dt<sub>min</sub>, an indicator of the rate of LV relaxation rate was not affected for either group. Significant changes in several parameters of LV function including LVEF, SW, tPFR, ESV, and EDV caused by ischemia were also identified;none of these negative effects were resorbed, even in part, during reperfusion. Conclusions: Diminished LV contractile efficiency during systole and diastole produced by ischemia-reperfusion did not improve with IC pre-treatment despite significant endogenous protection against tissue necrosis.
文摘To identify whether plasma Calcitonin gene-related peptide （CGRP） level isindexe for evaluating early cardiac dysfunction in patients with coronaryartery disease.Normal and coronary artery disease total sixty cases werechosen at random,which were diagnosed by coronary arteriography,foursubgroups （0,1,2,3 lesion branch group） were divided basing on coronaryartery lesion branch,each having fifteen cases.hemodynamic parameters weremeasured by left cardiac cather and left ventricular cineangiography,plasmaCGRP concentration was msaured by radioimmunoassay.results reveal:LVEFdecressed as coronary artery lesion branch increased,but there were nosignificantly difference between subgroups (only P<sub>sio</sub>【0.05);there weresignificantly difference of diastolic function parameters between subgroups,especially T,bad positive relativity to stenosis score （r=0.72,P【0.01）.Plasma CGRP level had positive relativity to stenosis score,time constant（r=0.37～0.38,P【0.05）;bad negative relativity to LVEF （r=-0,46,P【0.01）.in brief,Coronary artery disease imparies diastolic function prior tosystolic function;CGRP is a important index for evaluating early cardiacdysfunction in patients with coronary artery disease.
