BACKGROUND Invasive functional evaluation by fractional flow reserve(FFR)is considered as a gold standard for the evaluation of intermediate coronary stenosis.However,in patients with diabetes due to accelerated progr...BACKGROUND Invasive functional evaluation by fractional flow reserve(FFR)is considered as a gold standard for the evaluation of intermediate coronary stenosis.However,in patients with diabetes due to accelerated progression of atherosclerosis the outcome may be worse even in the presence of negative functional testing.CASE SUMMARY We present a case of 55-year-old male diabetic patient who was admitted for chest pain.Diagnostic coronary angiography disclosed 2 intermediate stenoses of the obtuse marginal branch with no evidence of restenosis on previously implanted stent.Patient undergone invasive functional testing of intermediate lesion with preserved FFR(0.88),low coronary flow reserve(1.2)and very high index of microvascular resistance(84).Due to discrepancy in invasive functional parameters,intravascular imaging with optical coherence tomography showed fibrotic stenoses without signs of thin-sup fibroatheroma.Because of the preserved FFR and no signs of vulnerable plaque,the interventional procedure was deferred and the patient continued with optimal medications.CONCLUSION Combined functional and anatomic imaging of intermediate coronary stenosis in diabetic patients represent comprehensive contemporary decision pathway in the management of the patients.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
目的采用多普勒导丝评价心脏X综合征(CSX)患者的冠脉循环。方法采用多普勒导丝测定观察组(38例CSX患者)及对照组(12例健康对照)的冠脉循环生理学参数。结果观察组的冠脉血流储备(CFR)为1.83±0.21,明显低于对照组的2.67±0.28,...目的采用多普勒导丝评价心脏X综合征(CSX)患者的冠脉循环。方法采用多普勒导丝测定观察组(38例CSX患者)及对照组(12例健康对照)的冠脉循环生理学参数。结果观察组的冠脉血流储备(CFR)为1.83±0.21,明显低于对照组的2.67±0.28,差异具有统计学意义(P<0.05);观察组的微血管阻力指数(IMR)为(36.2±5.3)U,明显高于对照组的(21.2±4.7)U,差异具有统计学意义(P<0.05);两组的血流储备分数(FFR)比较差异无统计学意义(0.92±0.08 vs 0.94±0.06,P>0.05)。结论 CSX患者心肌微血管阻力增加导致冠脉血流储备功能障碍。展开更多
目的:探讨术中测量微血管阻力指数(IMR)预测经皮冠状动脉(冠脉)介入治疗(PCI)患者发生围术期心肌梗死(PPMI)的价值。方法:纳入54例行择期PCI的稳定性心绞痛患者,根据术后超敏肌钙蛋白I(hs-TnI)水平分为PPMI组(n=24)和无PPMI组(n=30),测...目的:探讨术中测量微血管阻力指数(IMR)预测经皮冠状动脉(冠脉)介入治疗(PCI)患者发生围术期心肌梗死(PPMI)的价值。方法:纳入54例行择期PCI的稳定性心绞痛患者,根据术后超敏肌钙蛋白I(hs-TnI)水平分为PPMI组(n=24)和无PPMI组(n=30),测量PCI前、后血流储备分数(FFR)和IMR,记录球囊扩张次数,测量术后24 h内hs-TnI水平,使用IMR校正公式计算IMR,计算术前相对IMR比值(rPIMR)。结果:与无PPMI组相比,PPMI组患者PCI术前IMR(22.02±2.92 vs 17.46±3.44)、PCI后IMR(25.86±3.04 vs18.96±2.84)和rPIMR(1.22±0.21 vs 0.94±0.24)均升高(P均<0.05)。相关分析显示术前IMR(r=0.473)及术后IMR(r=0.458)均与hs-TnI呈正相关(P均<0.05)。受试者工作特征(ROC)曲线分析,PCI后IMR预测PPMI的价值最佳(曲线下面积:0.941,95%CI:0.884~0.998,P<0.05),最佳临界值为19.91,敏感度为95.8%,特异度为77.0%。多因素Logistic回归分析显示,术前IMR(OR=3.501,95%CI:0.974~12.582)、术后IMR(OR=15.074,95%CI:3.915~31.705)及rPIMR(OR=2.104,95%CI:1.672~2.375)均与PPMI独立相关(P均<0.05)。结论:IMR及rPIMR可预测PPMI。展开更多
文摘BACKGROUND Invasive functional evaluation by fractional flow reserve(FFR)is considered as a gold standard for the evaluation of intermediate coronary stenosis.However,in patients with diabetes due to accelerated progression of atherosclerosis the outcome may be worse even in the presence of negative functional testing.CASE SUMMARY We present a case of 55-year-old male diabetic patient who was admitted for chest pain.Diagnostic coronary angiography disclosed 2 intermediate stenoses of the obtuse marginal branch with no evidence of restenosis on previously implanted stent.Patient undergone invasive functional testing of intermediate lesion with preserved FFR(0.88),low coronary flow reserve(1.2)and very high index of microvascular resistance(84).Due to discrepancy in invasive functional parameters,intravascular imaging with optical coherence tomography showed fibrotic stenoses without signs of thin-sup fibroatheroma.Because of the preserved FFR and no signs of vulnerable plaque,the interventional procedure was deferred and the patient continued with optimal medications.CONCLUSION Combined functional and anatomic imaging of intermediate coronary stenosis in diabetic patients represent comprehensive contemporary decision pathway in the management of the patients.
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。
文摘目的采用多普勒导丝评价心脏X综合征(CSX)患者的冠脉循环。方法采用多普勒导丝测定观察组(38例CSX患者)及对照组(12例健康对照)的冠脉循环生理学参数。结果观察组的冠脉血流储备(CFR)为1.83±0.21,明显低于对照组的2.67±0.28,差异具有统计学意义(P<0.05);观察组的微血管阻力指数(IMR)为(36.2±5.3)U,明显高于对照组的(21.2±4.7)U,差异具有统计学意义(P<0.05);两组的血流储备分数(FFR)比较差异无统计学意义(0.92±0.08 vs 0.94±0.06,P>0.05)。结论 CSX患者心肌微血管阻力增加导致冠脉血流储备功能障碍。
文摘目的:探讨术中测量微血管阻力指数(IMR)预测经皮冠状动脉(冠脉)介入治疗(PCI)患者发生围术期心肌梗死(PPMI)的价值。方法:纳入54例行择期PCI的稳定性心绞痛患者,根据术后超敏肌钙蛋白I(hs-TnI)水平分为PPMI组(n=24)和无PPMI组(n=30),测量PCI前、后血流储备分数(FFR)和IMR,记录球囊扩张次数,测量术后24 h内hs-TnI水平,使用IMR校正公式计算IMR,计算术前相对IMR比值(rPIMR)。结果:与无PPMI组相比,PPMI组患者PCI术前IMR(22.02±2.92 vs 17.46±3.44)、PCI后IMR(25.86±3.04 vs18.96±2.84)和rPIMR(1.22±0.21 vs 0.94±0.24)均升高(P均<0.05)。相关分析显示术前IMR(r=0.473)及术后IMR(r=0.458)均与hs-TnI呈正相关(P均<0.05)。受试者工作特征(ROC)曲线分析,PCI后IMR预测PPMI的价值最佳(曲线下面积:0.941,95%CI:0.884~0.998,P<0.05),最佳临界值为19.91,敏感度为95.8%,特异度为77.0%。多因素Logistic回归分析显示,术前IMR(OR=3.501,95%CI:0.974~12.582)、术后IMR(OR=15.074,95%CI:3.915~31.705)及rPIMR(OR=2.104,95%CI:1.672~2.375)均与PPMI独立相关(P均<0.05)。结论:IMR及rPIMR可预测PPMI。