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Non-invasive Angiographic-based Fractional Flow Reserve:Technical Development,Clinical Implications,and Future Perspectives
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作者 Joyce Peper Michiel L.Bots +1 位作者 Tim Leiner Martin J.Swaans 《Current Medical Science》 SCIE CAS 2023年第3期423-433,共11页
New non-and less-invasive techniques have been developed to overcome the procedural and operator related burden of the fractional flow reserve(FFR)for the assessment of potentially significant stenosis in the coronary... New non-and less-invasive techniques have been developed to overcome the procedural and operator related burden of the fractional flow reserve(FFR)for the assessment of potentially significant stenosis in the coronary arteries.Virtual FFR-techniques can obviate the need for the additional flow or pressure wires as used for FFR measurements.This review provides an overview of the developments and validation of the virtual FFR-algorithms,states the challenges,discusses the upcoming clinical trials,and postulates the future role of virtual FFR in the clinical practice. 展开更多
关键词 coronary artery disease quantitative flow ratio fractional flow reserve diagnostic accuracy physiology guided percutaneous coronary intervention
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Fractional flow reserve measured via left internal mammary artery after coronary artery bypass grafting:Two case reports
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作者 Li-Ying Zhang Yi-Rong Gan +10 位作者 Yan-Zhen Wang Ding-Xiong Xie Zong-Ke Kou Xiao-Qing Kou Yun-Long Zhang Bing Li Rui Mao Tian-Xiang Liang Jing Xie Jian-Jian Jin Jin-Mei Yang 《World Journal of Clinical Cases》 SCIE 2023年第13期3045-3051,共7页
BACKGROUND The fractional flow reserve(FFR)has made the treatment of coronary heart disease more precise.However,there are few reports on the measurement of FFR via the left internal mammary artery(LIMA).Herein,we des... BACKGROUND The fractional flow reserve(FFR)has made the treatment of coronary heart disease more precise.However,there are few reports on the measurement of FFR via the left internal mammary artery(LIMA).Herein,we described the determination of further treatments by measuring FFR via the LIMA in 2 cases after coronary artery bypass grafting(CABG).CASE SUMMARY Case 1 was a 66-year-old male who was admitted due to“chest tightness after CABG.”The patient underwent CABG 7 years prior due to coronary heart disease.Coronary artery angiography showed complete occlusion of the left anterior descending artery(LAD),and subtotal occlusion of the third segment of the right coronary artery.On arterial angiography,there was 85%stenosis at the distal end of the anastomosis of the LIMA-LAD graft.FFR via LIMA was determined at 0.75.Thus,balloon dilation was performed in Case 1.FFR after balloon dilation was 0.94.Case 2 was a 60-year-old male who was admitted due to“chest tightness after CABG.”The patient underwent CABG 6 years prior due to coronary heart disease.There was 60%segmental stenosis in the middle segment of LAD and 75%anastomotic stenosis.FFR measured via LIMA was 0.83(negative);thus the intervention was not performed.Case 2 was given drug treatments.At the 3-mo follow-up,there was no recurrence of chest tightness or shortness of breath in both cases.They are currently under continual follow-up.CONCLUSION We provided evidence that FFR measurement via grafted blood vessels,especially LIMA,after CABG is a good method to determine the intervention course. 展开更多
关键词 Left internal mammary artery fractional flow reserve Coronary artery bypass INTERVENTION Case report
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Fractional flow reserve and non-hyperemic indices:Essential tools for percutaneous coronary interventions
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作者 Amine Mamoun Boutaleb Chadi Ghafari +1 位作者 Claudiu Ungureanu Stéphane Carlier 《World Journal of Clinical Cases》 SCIE 2023年第10期2123-2139,共17页
Hemodynamical evaluation of a coronary artery lesion is an important diagnostic step to assess its functional impact.Fractional flow reserve(FFR)received a class IA recommendation from the European Society of Cardiolo... Hemodynamical evaluation of a coronary artery lesion is an important diagnostic step to assess its functional impact.Fractional flow reserve(FFR)received a class IA recommendation from the European Society of Cardiology for the assessment of angiographically moderate stenosis.FFR evaluation of coronary artery disease offers improvement of the therapeutic strategy,deferring unnecessary procedures for lesions with a FFR>0.8,improving patients'management and clinical outcome.Post intervention,an optimal FFR>0.9 post stenting should be reached and>0.8 post drug eluting balloons.Non-hyperemic pressure ratio measurements have been validated in previous studies with a common threshold of 0.89.They might overestimate the hemodynamic significance of some lesions but remain useful whenever hyperemic agents are contraindicated.FFR remains the gold standard reference for invasive assessment of ischemia.We illustrate this review with two cases introducing the possibility to estimate also non-invasively FFR from reconstructed 3-D angiograms by quantitative flow ratio.We conclude introducing a hybrid approach to intermediate lesions(DFR 0.85-0.95)potentially maximizing clinical decision from all measurements. 展开更多
关键词 fractional flow measurements Coronary artery physiology Quantitative flow reserve Non-hyperemic pressure ratios
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Clinical applications of fractional flow reserve in bifurcation lesions 被引量:2
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作者 Sang Hyun Park Bon-Kwon Koo 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2012年第3期278-284,共7页
Pereutaneous coronary intervention (PCI) for coronary bifurcation lesions has been associated with lower procedural success rates and worse clinical outcomes compared with PCI for simple coronary lesions. Angiograph... Pereutaneous coronary intervention (PCI) for coronary bifurcation lesions has been associated with lower procedural success rates and worse clinical outcomes compared with PCI for simple coronary lesions. Angiographic evaluation alone is sometimes inaccurate and does not reflect the fimctional significance of bifurcation lesions. The fractional flow reserve (FFR) is an easily obtainable, reliable, and reproducible physiologic parameter. This parameter is epicardial lesion specific and reflects both degree of stenosis and the myocardial territory supplied by the specific artery. Recent studies have shown that FFR-guided provisional side branch intervention strategy for bifurcation lesions is feasible and effective and can reduce unnecessary complex interventions and related complications. However, an adequate understanding of coronary physiology and the pitfalls of FFR is essential to properly use FFR for PCI of complex bifurcation lesions. 展开更多
关键词 Coronary stenosis Bifurcation lesion PHYSIOLOGY fractional flow reserve
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Comparative efficacy and safety of adenosine and regadenoson for assessment of fractional flow reserve:A systematic review and meta-analysis
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作者 Gauravpal Singh Gill Akshaya Gadre Arun Kanmanthareddy 《World Journal of Cardiology》 2022年第5期319-328,共10页
BACKGROUND Adenosine is a coronary hyperemic agent used to measure invasive fractional flow reserve(FFR)of intermediate severity coronary stenosis.AIM To compare FFR assessment using adenosine with an alternate hypere... BACKGROUND Adenosine is a coronary hyperemic agent used to measure invasive fractional flow reserve(FFR)of intermediate severity coronary stenosis.AIM To compare FFR assessment using adenosine with an alternate hyperemic agent,regadenoson.METHODS PubMed,Google Scholar,CINAHL and Cochrane databases were queried for studies comparing adenosine and regadenoson for assessment of FFR.Data on FFR,correlation coefficient and adverse events from the selected studies were extracted and analyzed by means of random effects model.Two tailed P-value less than 0.05 was considered significant.Heterogeneity was assessed using I2 test.RESULTS Five studies with 248 patients were included in the final analysis.All included patients and coronary lesions underwent FFR assessment using both adenosine and regadenoson.There was no significant mean difference between FFR measurement by the two agents[odds ratio(OR)=-0.00;95%confidence interval(CI):(-0.02)-0.01,P=0.88].The cumulative correlation coefficient was 0.98(0.96-0.99,P<0.01).Three of five studies reported time to FFR with cumulative results favoring regadenoson(mean difference 34.31 s;25.14-43.48 s,P<0.01).Risk of adverse events was higher with adenosine compared to regadenoson(OR=2.39;95%CI:1.22-4.67,P=0.01),which most commonly included bradycardia and hypotension.Vast majority of the adverse events associated with both agents were transient.CONCLUSION The performance of regadenoson in inducing maximal hyperemia was comparable to that of adenosine.There was excellent correlation between the FFR measurements by both the agents.The use of adenosine,was however associated with higher risk of adverse events and longer time to FFR compared to regadenoson. 展开更多
关键词 ADENOSINE REGADENOSON fractional flow reserve META-ANALYSIS
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Modes of failure with fractional flow reserve guidewires:Insights from the manufacturer and user facility device experience database
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作者 Nauman Khalid Yagya Pandey +6 位作者 Umair Khalid Hassan Kamran Jason P Wermers Lovely Chhabra Mahboob Alam Hani Jneid Waleed Tallat Kayani 《World Journal of Cardiology》 2021年第7期223-229,共7页
BACKGROUND Fractional flow reserve(FFR)measurement is commonly used in the cardiac catheterization laboratory to assess the functional significance of coronary arterial plaques.Robust real-world data on complications ... BACKGROUND Fractional flow reserve(FFR)measurement is commonly used in the cardiac catheterization laboratory to assess the functional significance of coronary arterial plaques.Robust real-world data on complications and modes of failure of FFR guidewires are limited.AIM To characterize these outcomes by analyzing the post-marketing surveillance data from the United States Food and Drug Administration Manufacturer and User Facility Device Experience(MAUDE)database for commonly used FFR guidewires.METHODS The MAUDE database was queried from January 2010 through April 2020 for 3 FFR guidewires[PressureWireTM X(Abbott),CometTM(Boston Scientific),and VerrataTM(Philips)]by searching for the following events:“Injury”,“malfunction”,“death”,and“other”.This yielded 544 reports.After excluding incomplete reports,486 reports were analyzed.RESULTS Guidewire tip fracture was the most commonly reported mode of failure,in 174(35.8%)cases followed by guidewire kinking(n=152,31.3%),communication failure(n=141,29.0%),and shaft fracture(n=67,13.8%).In total,133(27.4%)device failures resulted in patient adverse events.The most common adverse event was retained guidewire tip,in 71(53.4%)cases,followed by freshly deployed stent dislodgment(n=26,19.6%)and coronary artery dissection(n=23,17.3%).Seven deaths were reported.CONCLUSION FFR guidewire failures can occur because of various mechanisms and cause patient adverse events.The MAUDE database serves as an important platform for improved collaboration among clinicians,device manufacturers,and regulators to improve device performance and optimize patient outcomes.Our analysis provides mechanistic insights of FFR guidewire failure and associated adverse events but cannot verify causality or provide a comparison among different guidewires. 展开更多
关键词 fractional flow reserve Coronary guidewire Adverse events Modes of failure Food and Drug Administration Manufacturer and user facility device experience
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Usefulness of Fractional Flow Reserve during Routine Clinical Procedures in All-Comer Coronary Artery Disease Patients
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作者 Sridhar Kasturi Shailender Singh +2 位作者 Vijay Kumar Reddy Shanivaram Manikandhar Pendyala Chandrashekar Challa 《World Journal of Cardiovascular Diseases》 2021年第11期509-522,共14页
<strong>Background:</strong><span style="white-space:normal;font-family:;" "=""> Fractional flow reserve (FFR)</span><span style="white-space:normal;font-f... <strong>Background:</strong><span style="white-space:normal;font-family:;" "=""> Fractional flow reserve (FFR)</span><span style="white-space:normal;font-family:;" "="">-</span><span style="white-space:normal;font-family:;" "="">guided interventions</span><span style="white-space:normal;font-family:;" "="">, </span><span style="white-space:normal;font-family:;" "="">though proved to be safe, continue</span><span style="white-space:normal;font-family:;" "=""> </span><span style="white-space:normal;font-family:;" "="">to be a much-underutilized modality in determining treatment strategy, and data is lacking in Indian population. <b>Objective:</b> We aimed to determine the use of FFR-guided PCI and assess the overall impact on treatment decisions and clinical outcomes in patients with acute coronary syndrome (ACS) or chronic coronary syndromes (CCS). <b>Methods:</b> In this single-center retrospective and prospective observational study, FFR had been performed for the evaluation of treatment reclassification and clinical outcomes, as per physician’s clinical practice. <b>Results: </b>Data was obtained for 250 subjects (mean age 60.45 ± 9.6 years) with 324 lesions. The treatment plan based on angiography alone changed in 28% of lesions post-hyperemic FFR. The initial treatment plan based on angiography vs. the final treatment plan post-FFR (>0.80) was medical management 56.5% vs. 66.0%;CABG 11.1% vs.</span><span style="white-space:normal;font-family:;" "=""> </span><span style="white-space:normal;font-family:;" "="">7.7%;and PCI 32.4% vs</span><span style="white-space:normal;font-family:;" "="">.</span><span style="white-space:normal;font-family:;" "=""> 26.2%. In subjects initially assigned to medical management, 14% had changed to PCI, and for subjects initially assigned to PCI, 44% had changed to medical therapy. Receiver operating characteristics (ROC) curve analysis revealed a good correlation between a resting FFR value of <0.87 and hyperemic FFR value of <0.80. The rate of 2-year major adverse cardiovascular events (MACE) was 0.9%. <b>Conclusion: </b>This study supports the use of FFR in determining treatment strategy in ACS or CCS patients with low MACE. Resting FFR value of <0.87 may</span><span style="white-space:normal;font-family:;" "=""> </span><span style="white-space:normal;font-family:;" "="">be an alternative to intracoronary nitroglycerine/adenosine/Nikorandil-induced FFR in predicting positive FFR particularly in hemodynamically unstable patients, and who are intolerant to hyperemic drugs.</span> 展开更多
关键词 ANGIOGRAM fractional flow Reserve Percutaneous Coronary Intervention Coronary Physiology
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Fractional Flow Reserve Guided Percutaneous Coronary ntervention Improves Clinical Outcome with Reduced Cost in Contemporary Clinical Practice 被引量:19
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作者 Po Hu Meng-Yao Tang +6 位作者 Wen-Chao Song Jun Jiang Yong Sun Xian-Bao Liu Chang-Ling Li Xin-Yang Hu Jian-An Wang 《Chinese Medical Journal》 SCIE CAS CSCD 2015年第15期2000-2005,共6页
Background:Fractional flow reserve (FFR) is currently considered as the gold standard for evaluating the functional significance of coronary stenosis.However,its potential benefits in real-world practice remain unk... Background:Fractional flow reserve (FFR) is currently considered as the gold standard for evaluating the functional significance of coronary stenosis.However,its potential benefits in real-world practice remain unknown in China.This study aimed to test the hypothesis that the use of FFR is associated with improved outcome and reduced cost in Chinese real-world clinical practice.Methods:A retrospective cohort study was carried out using the database of Second Affiliated Hospital of Zhejiang University,a tertiary and high-volume center in China.Clinical events were compared using the Cox proportional hazards model during a median follow-up of 13 months.Results:The study cohort consisted of 366 consecutive patients referred for coronary revascularization with adjunct FFR and 366 matched controls,from 2010 to 2014.Major adverse cardiac events (MACEs) (death,myocardial infarction,repeated revascularization,or hospitalization for angina) at 4 years were found in 12.0% ofangiography-guided patients and 4.9% in the FFR-guided group (P 〈 0.001).The mean number of implanted stents was significantly lower in FFR treated subjects (0.52 ± 0.82 stents) compared with the angiography-guided group (0.93 ± 0.96 stents) (P 〈 0.001).No difference in overall costs at initial hospitalization was observed between angiography-guided percutaneous coronary intervention (PCI) compared with FFR-guided PCI (RMB 33,000 Yuan,range:RMB 7393-44,700 Yuan) versus RMB 21,200 Yuan (RMB 19,100-47,100 Yuan) (P =0.54).However,costs for MACEs during follow-up were significantly reduced in the FFR-guided arm (P 〈 0.001).Conclusions:In the contemporary clinical practice,FFR-guided PCI is associated with decreased use of stents,improved clinical outcome,and reduced costs,compared with angiography-guided PCI. 展开更多
关键词 Costs and Cost Analysis fractional flow Reserve Myocardial Percutaneous Coronary Intervention PROGNOSIS
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Hemodynamic changes of fractional flow reserve after double kissing crush and provisional stenting technique for true bifurcation lesions 被引量:10
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作者 YE Fei CHEN Shao-liang ZHANG Jun-jie ZHU Zhong-sheng KAN Jing TIAN Nai-liang LIN Song LIU Zhi-zhong YOU Wei XU Hai-mei XU Jing 《Chinese Medical Journal》 SCIE CAS CSCD 2012年第15期2658-2662,共5页
Background Fractional flow reserve (FFR)-guided percutaneous coronary intervention (PCI) is associated with fewer unfavorable events. However, the hemodynamic change in FFR after different stenting approaches for ... Background Fractional flow reserve (FFR)-guided percutaneous coronary intervention (PCI) is associated with fewer unfavorable events. However, the hemodynamic change in FFR after different stenting approaches for bifurcation lesions is still not fully studied. The aim of this study was to analyze the hemodynamic changes in FFR after double kissing (DK) crush and provisional side branch (SB) stenting (PS) for true coronary bifurcation lesions. Methods Seventy-five patients with true bifurcated lesions were randomly divided into DK (n=38) and PS (n=37) groups. Additional SB stenting in the PS group was required if there was any pinched SB ostium 〉70% stenosis, or ≥ type B dissection, or TIMI flow 〈grade 3. FFR at hyperemia in the main vessel (MV) and SB was measured prior- and post-stenting, and at 8 months follow-up. Results Baseline clinical, angiographic and lesion characteristics were matched well between the two groups, with the exception of the final kissing balloon inflation (FKBI, 100.0% in the DK vs. 83.8% in the PS group, P 〈0.001). Baseline FFR was comparable between the DK and the PS groups, however, the acute gain and late loss of SB FFR at 8-month follow-up in the DK group were 0.18±0.15 and -0.06±0.11, compared to 0.12±0.18 (P=0.044) and -0.002±0.07 (P=-0.037) in the PS group, respectively. MV FFR post-stenting 〉0.94 was seen in about 40% of patients. There was no significant difference in the clinical events at 1-year follow-up between the two groups. Conclusions DK crush was associated with improved acute gain and late loss of SB FFR. The lower rate of FFR 〉0.94 after stenting underscored the further improvement of stentinq quality. 展开更多
关键词 double kissing crush bifurcation provisional fractional flow reserve
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Current status of assessment of fractional flow reserve 被引量:5
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作者 FANG Yi-min Grisana Grootenhuijs-Triyasut +1 位作者 Pieter A. Doevendans Yolande Appelman 《Chinese Medical Journal》 SCIE CAS CSCD 2009年第6期725-731,共7页
Coronary angiography presently remains the main method tor the diagnosis and instruction of epicardial coronary disease. However, precise characterization of the significance for any given stenosis is limited by the i... Coronary angiography presently remains the main method tor the diagnosis and instruction of epicardial coronary disease. However, precise characterization of the significance for any given stenosis is limited by the inability to identify intermediate coronary lesions responsible for ischemia. In clinical practice, in addition to the assessment of the anatomical details of vessel narrowing, a more impediment to coronary precise assessment of the blood flow has become extremely important. At present, several physiological parameters have been introduced to improve discrimination in functional coronary lesion severity during cardiac catheterization. Of these parameters, myocardial fractional flow reserve (FFR) has been the most frequently used and is being increasingly applied to assess the functional significance of intermediate lesions. FFR can provide important information, both for decision making in diagnostic angiography and for monitoring and evaluating coronary interventions. 展开更多
关键词 coronary angiography fractional flow reserve STENT ADENOSINE
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Clinical Relevance of Coronary Fractional Flow Reserve: Art-of-state 被引量:2
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作者 Yohanes Adiputra Shao-Liang Chen 《Chinese Medical Journal》 SCIE CAS CSCD 2015年第10期1399-1406,共8页
Objective:The objective was to delineate the current knowledge of fractional flow reserve (FFR) in terms of definition,features,clinical applications,and pitfalls of measurement of FFR.Data Sources:We searched dat... Objective:The objective was to delineate the current knowledge of fractional flow reserve (FFR) in terms of definition,features,clinical applications,and pitfalls of measurement of FFR.Data Sources:We searched database for primary studies published in English.The database of National Library of Medicine (NLM),MEDLINE,and PubMed up to July 2014 was used to conduct a search using the keyword term "FFR".Study Selection:The articles about the definition,features,clinical application,and pitfalls of measurement of FFR were identified,retrieved,and reviewed.Results:Coronary pressure-derived FFR rapidly assesses the hemodynamic significance of individual coronary artery lesions and can readily be performed in the catheterization laboratory.The use of FFR has been shown to effectively guide coronary revascularization procedures leading to improved patient outcomes.Conclusions:FFR is a valuable tool to determine the functional significance of coronary stenosis.It combines physiological and anatomical information,and can be followed immediately by percutaneous coronary intervention (PCI) if necessary.The technique of FFR measurement can be performed easily,rapidly,and safely in the catheterization laboratory.By systematic use of FFR in dubious stenosis and multi-vessel disease,PCI can be made an even more effective and better treatment than it is currently.The current clinical evidence for FFR should encourage cardiologists to use this tool in the catheterization laboratory. 展开更多
关键词 Clinical Application Features: fractional flow Reserve LIMITATION
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Noninvasive assessment of renal fractional flow reserve: are we there yet? 被引量:2
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作者 QiXiaolong Fan Guoxin Li Zhiwei Ma Wanrong Yang Changqing 《Chinese Medical Journal》 SCIE CAS CSCD 2014年第5期992-994,共3页
The highly diagnostic performance of renal transstenotic pressure gradients (TSPG) and fractional flow reserve (FFR) has been well validated for assessment of the hemodynamic renal artery stenosis (RAS).1-4 Acco... The highly diagnostic performance of renal transstenotic pressure gradients (TSPG) and fractional flow reserve (FFR) has been well validated for assessment of the hemodynamic renal artery stenosis (RAS).1-4 Accordingly,an expert consensus panel of the American Heart Association recommended that a peak systolic gradient of at least 20 mmHg (1 mmHg=0.133 kPa),or a mean pressure gradient of 10 mmHg,be used to identify candidate lesions for revascularization in symptomatic patients with RAS. 展开更多
关键词 fractional flow reserve renal artery stenosis transstenotic pressure gradients
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Noninvasive Measurement of Coronary Fractional Flow Reserve: An Under-exploiting Newland
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作者 Guo-Xin Fan Ruo-Shuang Han +3 位作者 Jia-Chen Luo Bi-Sheng Huang Tao Jiang Ji-Kun Wang 《Chinese Medical Journal》 SCIE CAS CSCD 2015年第12期1695-1699,共5页
INTRODUCTION In patients with coronary artery disease (CAD), the most important factors regarding to both symptoms and outcomes are the presence and extent of inducible ischemia. Alleviation of ischemia with percuta... INTRODUCTION In patients with coronary artery disease (CAD), the most important factors regarding to both symptoms and outcomes are the presence and extent of inducible ischemia. Alleviation of ischemia with percutaneous coronary intervention (PCI) can improve symptoms and clinical outcomes. 展开更多
关键词 ANGIOGRAPHY Computed Tomography fractional flow Reserve Optical Coherence Tomography
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Fractional Flow Reserve: From Homeland to Colony
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作者 Guo-Xin Fan Jia-Chen Luo +2 位作者 Zhi Zhou Yue-Ye Wang Ji-Kun Wang 《Chinese Medical Journal》 SCIE CAS CSCD 2016年第1期101-104,共4页
In current catheter research, there are 3 main directions with respect to fractional flow reserve (FFR), including instantaneous wave-tree ratio, noninvasive measurement of FFR, and FFR transferred from coronary cir... In current catheter research, there are 3 main directions with respect to fractional flow reserve (FFR), including instantaneous wave-tree ratio, noninvasive measurement of FFR, and FFR transferred from coronary circulation to other ischemia-inducing circulation. Recently, an interesting study was published, in which FFR was performed to diagnose and guide stenting in chronic mesenteric ischemia (CMI). We herein highlighted, the implications and limitations of FFR from coronary artery to renal artery and mesenteric artery for future investigations, respectively. 展开更多
关键词 Chronic Mesenteric Ischemia Coronary Artery Disease fractional flow Reserve Renal Artery Stenosis
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Role of fractional flow reserve in guiding intervention for borderline coronary lesions
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作者 Xuekun Shi Lu Cheng 《Family Medicine and Community Health》 2014年第3期18-25,共8页
Objective:This study investigated the clinical efficacy and value of fractional flow reserve(FFR)in guiding the treatment of borderline coronary lesions.Methods:Forty-three patients with borderline coronary lesions,as... Objective:This study investigated the clinical efficacy and value of fractional flow reserve(FFR)in guiding the treatment of borderline coronary lesions.Methods:Forty-three patients with borderline coronary lesions,as demonstrated by coronary angiography,and who had FFR measurements were selected.The patients were grouped accord-ing to FFR values.All patients were evaluated 6 months after surgery to record major adverse cardiac events(MACE[sudden cardiac death,non-fatal myocardial infarction,or revasculariza-tion])and recurrence of angina pectoris.Results:After the 6-month follow-up,no sudden cardiac deaths or myocardial infarctions occurred in either group,and there were no statistically significant differences(P>0.05).Inter-group comparisons showed that in the groups with a FFR<0.75,the recurrence rate of angina pectoris in the PCI group was significantly lower than the drug therapy group(0.08%vs.0.27%,P<0.05).In contrast,the recurrence rate of angina pectoris in the PCI group among the groups with a FFR<0.75 revealed no statistical significance when compared to the groups with a FFR≥0.75(0.08%vs.0.05%,P>0.05).The recurrence rate of angina pectoris in the simple drug therapy group among the groups with a FFR<0.75 was higher than the same groups with a FFR≥0.75(0.27%vs.0.05%,P<0.05).Conclusion:When coronary intervention is used to treat borderline lesions,guiding inter-ventional therapy with measurement of FFR does not increase the incidence of adverse cardiovas-cular events in the short term and can better guide PCI therapy. 展开更多
关键词 Coronary intervention Borderline lesion fractional flow reserve
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Relationship between fibrinogen and fractional flow reserve in coronary intermediate lesions
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作者 王记远 《China Medical Abstracts(Internal Medicine)》 2017年第1期37-,共1页
Objective To study the relationgship and the clinical significance between plasma fibrinogen and fractional flow reserve(FFR)in coronary intermediate lesions.Methods The patients were from The Department of Cardiovasc... Objective To study the relationgship and the clinical significance between plasma fibrinogen and fractional flow reserve(FFR)in coronary intermediate lesions.Methods The patients were from The Department of Cardiovascular of Affiliated Hospital of Xuzhou Medical College.Their coronary artery lesions were assessed by 展开更多
关键词 FFR Relationship between fibrinogen and fractional flow reserve in coronary intermediate lesions
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Unsteady rotating flows of a viscoelastic fluid with the fractional Maxwell model between coaxial cylinders 被引量:9
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作者 Haitao Qi Hui Jin 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2006年第4期301-305,共5页
The fractional calculus is used in the constitutive relationship model of viscoelastic fluid. A generalized Maxwell model with fractional calculus is considered. Based on the flow conditions described, two flow cases ... The fractional calculus is used in the constitutive relationship model of viscoelastic fluid. A generalized Maxwell model with fractional calculus is considered. Based on the flow conditions described, two flow cases are solved and the exact solutions are obtained by using the Weber transform and the Laplace transform for fractional calculus. 展开更多
关键词 Viscoelastic fluid Unsteady flow fractional Maxwell model Exact solution
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Deferred revascularization in diabetic patient according to combined invasive functional and intravascular imaging data:A case report
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作者 Arif Al Nooryani Wael Aboushokka +1 位作者 Branko Beleslin Biljana Nedeljkovic-Beleslin 《World Journal of Clinical Cases》 SCIE 2024年第13期2269-2274,共6页
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
关键词 fractional flow reserve Coronary flow reserve Index of microvascular resistance Optical coherence tomography Intermediate coronary stenosis Case report
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The fast method and convergence analysis of the fractional magnetohydrodynamic coupled flow and heat transfer model for the generalized second-grade fluid 被引量:1
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作者 Xiaoqing Chi Hui Zhang Xiaoyun Jiang 《Science China Mathematics》 SCIE CSCD 2024年第4期919-950,共32页
In this paper,we first establish a new fractional magnetohydrodynamic(MHD)coupled flow and heat transfer model for a generalized second-grade fluid.This coupled model consists of a fractional momentum equation and a h... In this paper,we first establish a new fractional magnetohydrodynamic(MHD)coupled flow and heat transfer model for a generalized second-grade fluid.This coupled model consists of a fractional momentum equation and a heat conduction equation with a generalized form of Fourier law.The second-order fractional backward difference formula is applied to the temporal discretization and the Legendre spectral method is used for the spatial discretization.The fully discrete scheme is proved to be stable and convergent with an accuracy of O(τ^(2)+N-r),whereτis the time step-size and N is the polynomial degree.To reduce the memory requirements and computational cost,a fast method is developed,which is based on a globally uniform approximation of the trapezoidal rule for integrals on the real line.The strict convergence of the numerical scheme with this fast method is proved.We present the results of several numerical experiments to verify the effectiveness of the proposed method.Finally,we simulate the unsteady fractional MHD flow and heat transfer of the generalized second-grade fluid through a porous medium.The effects of the relevant parameters on the velocity and temperature are presented and analyzed in detail. 展开更多
关键词 fractional MHD coupled flow and heat transfer model generalized second-grade fuid fast method convergence analysis numerical simulation
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EVOLUTION FILTRATION PROBLEMS WITH SEAWATER INTRUSION: TWO-PHASE FLOW DUAL MIXED VARIATIONAL ANALYSIS 被引量:1
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作者 Gonzalo ALDUNCIN 《Acta Mathematica Scientia》 SCIE CSCD 2015年第5期1142-1162,共21页
Tow-phase flow mixed variational formulations of evolution filtration problems with seawater intrusion are analyzed. A dual mixed fractional flow velocity-pressure model is considered with an air-fresh water and a fre... Tow-phase flow mixed variational formulations of evolution filtration problems with seawater intrusion are analyzed. A dual mixed fractional flow velocity-pressure model is considered with an air-fresh water and a fresh water-seawater characterization. For analysis and computational purposes, spatial decompositions based on nonoverlapping multidomains, above and below the sea level, are variationally introduced with internal boundary fluxes dualized as weak transmission constraints. Further, parallel augmented and exactly penalized duality algorithms, and proximation semi-implicit time marching schemes, are established and analyzed. 展开更多
关键词 two-phase flow in coastal aquifers fractional two-phase flow dual mixed variational analysis macro-hybrid variational formulations augmented exactly penalized duality algorithms proximation semi-implicit time marching schemes
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