The dysfunction of coronary microcirculation is an important cause of coronary artery disease(CAD).The index of microcirculatory resistance(IMR)is a quantitative evaluation of coronary microcirculatory function,which ...The dysfunction of coronary microcirculation is an important cause of coronary artery disease(CAD).The index of microcirculatory resistance(IMR)is a quantitative evaluation of coronary microcirculatory function,which provides a significant reference for the prediction,diagnosis,treatment,and prognosis of CAD.IMR also plays a key role in investigating the interaction between epicardial and microcirculatory dysfunctions,and is closely associated with coronary hemodynamic parameters such as flow rate,distal coronary pressure,and aortic pressure,which have been widely applied in computational studies of CAD.However,there is currently a lack of consensus across studies on the normal and pathological ranges of IMR.The relationships between IMR and coronary hemodynamic parameters have not been accurately quantified,which limits the application of IMR in computational CAD studies.In this paper,we discuss the research gaps between IMR and its potential applications in the computational simulation of CAD.Computational simulation based on the combination of IMR and other hemodynamic parameters is a promising technology to improve the diagnosis and guide clinical trials of CAD.展开更多
Objective To evaluate the predictive value and impact for the index of microcirculatory resistance(IMR)in myocardial infarction(MI)patients with elective percutaneous coronary intervention(PCI)for treating coronary ar...Objective To evaluate the predictive value and impact for the index of microcirculatory resistance(IMR)in myocardial infarction(MI)patients with elective percutaneous coronary intervention(PCI)for treating coronary artery occlusion.Methods A total of 34 patients with STEMI or non-STEMI treated after 12h time window展开更多
Physicians cannot rely solely on the angiographic appearance of epicardial coronary artery stenosis when evaluating patients with myocardial ischemia. Instead, sound knowledge of coronary vascular physiology and of th...Physicians cannot rely solely on the angiographic appearance of epicardial coronary artery stenosis when evaluating patients with myocardial ischemia. Instead, sound knowledge of coronary vascular physiology and of the methods currently available for its characterization can improve the diagnostic and prognostic accuracy of invasive assessment of the coronary circulation, and help improve clinical decision-making. In this article we summarize the current methods available for a thorough assessment of coronary physiology.展开更多
目的通过冠状动脉造影微循环阻力指数(caIMR)评估急性ST段抬高型心肌梗死(STEMI)患者经皮冠状动脉介入治疗(PCI)术后即刻与随访6个月时冠状动脉微循环功能的变化,进而预测患者术后1年心脏功能的变化。方法纳入TARGET STEMI OCT China研...目的通过冠状动脉造影微循环阻力指数(caIMR)评估急性ST段抬高型心肌梗死(STEMI)患者经皮冠状动脉介入治疗(PCI)术后即刻与随访6个月时冠状动脉微循环功能的变化,进而预测患者术后1年心脏功能的变化。方法纳入TARGET STEMI OCT China研究中符合caIMR测量的患者30例,测量直接PCI术后即刻(caIMR0)及随访6个月(caIMR6)冠状动脉造影的caIMR值,通过线性回归方法分析冠状动脉微循环功能的变化对STEMI患者1年心脏功能的影响。结果30例患者caIMR0(41.70±12.22)U,caIMR6(28.74±10.05)U。caIMR6与caIMR0的差值△caIMR(–12.96±13.08)U。线性回归分析发现,△caIMR与术后1年的左心室射血分数(LVEF)呈负相关(P=0.023,r=–0.414),△caIMR对患者长期预后具有一定的预测价值。协方差分析发现,靶病变血管为左前降支(β=10.18,P=0.016)及新生内膜厚度(β=0.11,P=0.039)与caIMR6成正相关。结论STEMI患者△caIMR对术后1年的LVEF具有预测价值,二者成负相关。△caIMR越小时,术后1年的LVEF恢复越好。展开更多
基金supported by the Natural Science Foundation of China(Nos.61527811 and 61701435)the Key Research and Development Program of Zhejiang Province(No.2020C03016)+1 种基金the Zhejiang Provincial Natural Science Foundation of China(No.LY17H180003)the Medical Health Science and Technology Project of Zhejiang Provincial Health Commission(No.2020RC094),China。
文摘The dysfunction of coronary microcirculation is an important cause of coronary artery disease(CAD).The index of microcirculatory resistance(IMR)is a quantitative evaluation of coronary microcirculatory function,which provides a significant reference for the prediction,diagnosis,treatment,and prognosis of CAD.IMR also plays a key role in investigating the interaction between epicardial and microcirculatory dysfunctions,and is closely associated with coronary hemodynamic parameters such as flow rate,distal coronary pressure,and aortic pressure,which have been widely applied in computational studies of CAD.However,there is currently a lack of consensus across studies on the normal and pathological ranges of IMR.The relationships between IMR and coronary hemodynamic parameters have not been accurately quantified,which limits the application of IMR in computational CAD studies.In this paper,we discuss the research gaps between IMR and its potential applications in the computational simulation of CAD.Computational simulation based on the combination of IMR and other hemodynamic parameters is a promising technology to improve the diagnosis and guide clinical trials of CAD.
文摘Objective To evaluate the predictive value and impact for the index of microcirculatory resistance(IMR)in myocardial infarction(MI)patients with elective percutaneous coronary intervention(PCI)for treating coronary artery occlusion.Methods A total of 34 patients with STEMI or non-STEMI treated after 12h time window
文摘Physicians cannot rely solely on the angiographic appearance of epicardial coronary artery stenosis when evaluating patients with myocardial ischemia. Instead, sound knowledge of coronary vascular physiology and of the methods currently available for its characterization can improve the diagnostic and prognostic accuracy of invasive assessment of the coronary circulation, and help improve clinical decision-making. In this article we summarize the current methods available for a thorough assessment of coronary physiology.
文摘目的通过冠状动脉造影微循环阻力指数(caIMR)评估急性ST段抬高型心肌梗死(STEMI)患者经皮冠状动脉介入治疗(PCI)术后即刻与随访6个月时冠状动脉微循环功能的变化,进而预测患者术后1年心脏功能的变化。方法纳入TARGET STEMI OCT China研究中符合caIMR测量的患者30例,测量直接PCI术后即刻(caIMR0)及随访6个月(caIMR6)冠状动脉造影的caIMR值,通过线性回归方法分析冠状动脉微循环功能的变化对STEMI患者1年心脏功能的影响。结果30例患者caIMR0(41.70±12.22)U,caIMR6(28.74±10.05)U。caIMR6与caIMR0的差值△caIMR(–12.96±13.08)U。线性回归分析发现,△caIMR与术后1年的左心室射血分数(LVEF)呈负相关(P=0.023,r=–0.414),△caIMR对患者长期预后具有一定的预测价值。协方差分析发现,靶病变血管为左前降支(β=10.18,P=0.016)及新生内膜厚度(β=0.11,P=0.039)与caIMR6成正相关。结论STEMI患者△caIMR对术后1年的LVEF具有预测价值,二者成负相关。△caIMR越小时,术后1年的LVEF恢复越好。
文摘目的通过测定经皮冠状动脉介入治疗(percutaneous coronary intervention,PCI)术前后的冠脉血流储备分数(fractional flow reserve,FFR)、冠脉微循环阻力指数(index of microcirculatory resistance,IMR)、冠脉血流储备(coronary flow reserve,CFR)、平均传导时间(transit mean time hyperemia,Tmn)等指标评估PCI术后冠脉功能学变化。方法入选冠脉造影显示至少有单支冠状动脉主支(LAD、LCX、RCA)病变狭窄≥70%,且FFR<0.80接受PCI术患者76例。PCI术前后分别测量FFR、CFR、IMR、充血状态下平均传导时间(TmnHyp)。比较所有患者PCI术前后的Pa、Pd、TmnHyp、FFR、CFR、IMR等生理学指标。分析PCI术前各冠脉生理学指标值与PCI术后冠脉血流增加的关系。与术前TmnHyp比较,PCI术后患者血流量升高组和血流量无升高组,比较两组患者的一般临床资料、相关生化指标、心血管疾病危险因素和冠脉生理学指标。结果与PCI术前比较,术后的IMR值和TmnHyp值降低,而CFR值和FFR值明显升高(P<0.01)。多因素logistic回归分析,预测PCI术后血流增加的PCI术前IMR值为15.54、FFR值为0.61。结论经PCI术后,大部分患者的冠脉生理学指标即刻获得改善,IMR和FFR测定有助于识别PCI术后冠脉血流是否改善。