Computational quantitative flow ratio to assess functional severity of coronary artery stenosis.
TL;DR: QFR appears to be a safe and effective gatekeeper to wire-based FFR when applying a QFR threshold of >0.90 to rule out significant CAD.
About: This article is published in International Journal of Cardiology.The article was published on 2018-11-15 and is currently open access. It has received 16 citations till now. The article focuses on the topics: Fractional flow reserve.
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TL;DR: The functional performance of the Fantom BRS is investigated and quantitative flow ratio (QFR) has been validated as an accurate surrogate of standard wire‐based fractional flow reserve.
Abstract: BACKGROUND Quantitative flow ratio (QFR) has been validated as an accurate surrogate of standard wire-based fractional flow reserve. The clinical and angiographic outcomes of the Fantom sirolimus-eluting bioresorbable coronary scaffold (BRS) have been previously studied and reported. We investigate the functional performance of the Fantom BRS. METHODS The FANTOM II trial prospectively enrolled 240 patients with stable coronary artery disease or unstable angina, of which 235 patients received the Fantom BRS and were included in the present analysis. We performed an independent serial QFR analysis of the target vessel at baseline, post-percutaneous coronary intervention (PCI), and at 6- or 9-month and 24-month follow-up, using a QFR threshold ≤0.80 to define functional ischemia. RESULTS QFR was analyzable in 178 patients at baseline, 185 post-PCI, 178 at 6- or 9-month follow-up, and 30 at 24-month follow-up. At baseline, 119 patients (66.9%) had a QFR ≤0.80, whereas 12 (6.5%) post-PCI, 13 (7.3%) at 6- or 9-month follow-up, and 3 (10.0%) at 24-month follow-up had a QFR ≤0.80. QFR improved from baseline to post-PCI, and decreased from post-PCI up to 24-month follow-up. During follow-up period, 28 patients (11.9%) had target vessel revascularization, of which 21 had analyzable QFR and 16 patients (76.1%) had QFR ≤0.80 at the time of revascularization. CONCLUSIONS Off-line serial QFR assessment demonstrated that around 30% patients did not have functionally significant lesions at baseline and the time with target vessel revascularization. PCI with the Fantom BRS improved functional ischemia with a slight decrease in QFR values over 24 months.
6 citations
Cites background from "Computational quantitative flow rat..."
...96.(16) Thus, QFR may provide better patient/lesion selection in PCI....
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TL;DR: The pathophysiologic basis and contemporary and novel diagnostic approaches for INOCA are discussed to construct a better understanding of InOCA evaluation.
Abstract: Ischemia with non-obstructive coronary arteries (INOCA) has gained increasing attention due to its high prevalence, atypical clinical presentations, difficult diagnostic procedures, and poor prognosis. There are two endotypes of INOCA—one is coronary microvascular dysfunction and the other is vasospastic angina. Diagnosis of INOCA lies in evaluating coronary flow reserve, microcirculatory resistance, and vasoreactivity, which is usually obtained via invasive coronary interventional techniques. Non-invasive diagnostic approaches such as echocardiography, single-photon emission computed tomography, cardiac positron emission tomography, and cardiac magnetic resonance imaging are also valuable for assessing coronary blood flow. Some new techniques (e.g., continuous thermodilution and angiography-derived quantitative flow reserve) have been investigated to assist the diagnosis of INOCA. In this review, we aimed to discuss the pathophysiologic basis and contemporary and novel diagnostic approaches for INOCA, to construct a better understanding of INOCA evaluation.
5 citations
TL;DR: In this article, the authors identify the physiology evaluation method which is associated with the lowest exposure to ionizing radiation in percutaneous coronary intervention (PCI) substantiated by evaluation of the coronary artery lesion's functional significance.
Abstract: Introduction The development of interventional cardiology increases the number of invasive procedures which are inevitably associated with increased exposure to ionizing radiation and associated risks. A percutaneous coronary intervention (PCI) substantiated by evaluation of the coronary artery lesion's functional significance is recommended by both European and American cardiologists. Nevertheless, the prevalence of physiology-guided PCIs does not exceed 10% all over the globe. Aim To identify the physiology evaluation method which is associated with the lowest exposure to ionising radiation. Material and methods Anonymised data of 421 patients with stable angina pectoris for whom elective coronary artery angiography followed by physiological assessment of intermediate coronary artery stenosis was performed were prospectively included in this study. Only diagnostic-procedure-related data of dose of ionizing radiation were analysed. Physiological assessment of coronary artery lesions was performed by fractional flow reserve (FFR), quantitative flow ratio (QFR), or instantaneous wave-free ratio (iFR). Results Compared to FFR as a reference, fluoroscopy time (FT) was almost half in QFR and almost double in iFR, p < 0.001. QFR was associated with more than 3 times shorter FT compared to iFR. The dose area product was 663.87 ±260.51 cGy/cm2 (p = 0.03) lower in QFR compared to iFR. Conclusions QFR is associated with significantly reduced exposure to ionising radiation compared to both FFR and iFR. Therefore, wider QFR application in clinical practice could eliminate any additional exposure to ionising radiation and increase the prevalence of physiology-guided coronary artery revascularization.
4 citations
TL;DR: Both cFFR and QFR have good diagnostic performance in detecting functional severity of coronary arteries and showed similar diagnostic parameters.
Abstract: Background. Use of the fractional flow reserve (FFR) technique is recommended to evaluate coronary stenosis severity and guide revascularization. However, its high cost, time to administer, and the side effects of adenosine reduce its clinical utility. Two novel adenosine-free indices, contrast-FFR (cFFR) and quantitative flow ratio (QFR), can simplify the functional evaluation of coronary stenosis. This study aimed to analyze the diagnostic performance of cFFR and QFR using FFR as a reference index. Methods. We conducted a systematic review and meta-analysis of observational studies in which cFFR or QFR was compared to FFR. A bivariate model was applied to pool diagnostic parameters. Cochran’s Q test and the I2 index were used to assess heterogeneity and identify the potential source of heterogeneity by metaregression and sensitivity analysis. Results. Overall, 2220 and 3000 coronary lesions from 20 studies were evaluated by cFFR and QFR, respectively. The pooled sensitivity and specificity were 0.87 (95% CI: 0.81, 0.91) and 0.92 (95% CI: 0.88, 0.94) for cFFR and 0.87 (95% CI: 0.82, 0.91) and 0.91 (95% CI: 0.87, 0.93) for QFR, respectively. No statistical significance of sensitivity and specificity for cFFR and QFR were observed in the bivariate analysis ( and 0.4397, resp.). The area under summary receiver-operating curve of cFFR and QFR was 0.95 (95% CI: 0.93, 0.97) for cFFR and 0.95 (95% CI: 0.93, 0.97). Conclusion. Both cFFR and QFR have good diagnostic performance in detecting functional severity of coronary arteries and showed similar diagnostic parameters.
4 citations
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...[23] 2018 101 Single-center, retrospective 0....
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TL;DR: In this article, a new functional index of coronary stenosis severity compared with gold standard invasive measurement of fractional flow reserve (FFR) was proposed, called SmartFFR, which was computed after the 3D reconstruction of the vessels of interest and the subsequent blood flow simulations with a mean total computational time of seven minutes.
Abstract: Aims: In this study, we evaluate the efficacy of SmartFFR, a new functional index of coronary stenosis severity compared with gold standard invasive measurement of fractional flow reserve (FFR). We also assess the influence of the type of simulation employed on smartFFR (i.e. Fluid Structure Interaction vs. rigid wall assumption). Methods and Results: In a dataset of 167 patients undergoing either computed tomography coronary angiography (CTCA) and invasive coronary angiography or only invasive coronary angiography (ICA), as well as invasive FFR measurement, SmartFFR was computed after the 3D reconstruction of the vessels of interest and the subsequent blood flow simulations. 202 vessels were analyzed with a mean total computational time of seven minutes. SmartFFR was used to process all models reconstructed by either method. The mean FFR value of the examined dataset was 0.846 ± 0.089 with 95% CI for the mean of 0.833-0.858, whereas the mean SmartFFR value was 0.853 ± 0.095 with 95% CI for the mean of 0.84-0.866. SmartFFR was significantly correlated with invasive FFR values (RCCTA = 0.86, p CCTA < 0.0001, RICA = 0.84, p ICA < 0.0001, R overall = 0.833, p overall < 0.0001), showing good agreement as depicted by the Bland-Altman method of analysis. The optimal SmartFFR threshold to diagnose ischemia was ≤0.83 for the overall dataset, ≤0.83 for the CTCA-derived dataset and ≤0.81 for the ICA-derived dataset, as defined by a ROC analysis (AUCoverall = 0.956, p < 0.001, AUCICA = 0.975, p < 0.001, AUCCCTA = 0.952, p < 0.001). Conclusion: SmartFFR is a fast and accurate on-site index of hemodynamic significance of coronary stenosis both at single coronary segment and at two or more branches level simultaneously, which can be applied to all CTCA or ICA sequences of acceptable quality.
3 citations
References
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TL;DR: The Global Burden of Disease 2015 Study provides a comprehensive assessment of all-cause and cause-specific mortality for 249 causes in 195 countries and territories from 1980 to 2015, finding several countries in sub-Saharan Africa had very large gains in life expectancy, rebounding from an era of exceedingly high loss of life due to HIV/AIDS.
4,804 citations
TL;DR: The If Inhibitor Ivabradine in Patients With Coronary Artery Disease and Left Ventricular Dysfunction is evaluated as well as patients with Diabetes mellitus for Optimal management of Multivessel disease.
Abstract: 99mTc
: technetium-99m
201TI
: thallium 201
ABCB1
: ATP-binding cassette sub-family B member 1
ABI
: ankle-brachial index
ACC
: American College of Cardiology
ACCF
: American College of Cardiology Foundation
ACCOMPLISH
: Avoiding Cardiovascular Events Through Combination Therapy in Patients Living With Systolic Hypertension
ACE
: angiotensin converting enzyme
ACIP
: Asymptomatic Cardiac Ischaemia Pilot
ACS
: acute coronary syndrome
ADA
: American Diabetes Association
ADP
: adenosine diphosphate
AHA
: American Heart Association
ARB
: angiotensin II receptor antagonist
ART
: Arterial Revascularization Trial
ASCOT
: Anglo-Scandinavian Cardiac Outcomes Trial
ASSERT
: Asymptomatic atrial fibrillation and Stroke Evaluation in pacemaker patients and the atrial fibrillation Reduction atrial pacing Trial
AV
: atrioventricular
BARI 2D
: Bypass Angioplasty Revascularization Investigation 2 Diabetes
BEAUTIFUL
: Morbidity-Mortality Evaluation of the If Inhibitor Ivabradine in Patients With Coronary Artery Disease and Left Ventricular Dysfunction
BIMA
: bilateral internal mammary artery
BMI
: body mass index
BMS
: bare metal stent
BNP
: B-type natriuretic peptide
BP
: blood pressure
b.p.m.
: beats per minute
CABG
: coronary artery bypass graft
CAD
: coronary artery disease
CAPRIE
: Clopidogrel vs. Aspirin in Patients at Risk of Ischaemic Events
CASS
: Coronary Artery Surgery Study
CCB
: calcium channel blocker
CCS
: Canadian Cardiovascular Society
CFR
: coronary flow reserve
CHARISMA
: Clopidogrel for High Atherothrombotic Risk and Ischaemic Stabilization, Management and Avoidance
CI
: confidence interval
CKD
: chronic kidney disease
CKD-EPI
: Chronic Kidney Disease Epidemiology Collaboration
CMR
: cardiac magnetic resonance
CORONARY
: The CABG Off or On Pump Revascularization Study
COURAGE
: Clinical Outcomes Utilizing Revascularization and Aggressive Drug Evaluation
COX-1
: cyclooxygenase-1
COX-2
: cyclooxygenase-2
CPG
: Committee for Practice Guidelines
CT
: computed tomography
CTA
: computed tomography angiography
CV
: cardiovascular
CVD
: cardiovascular disease
CXR
: chest X-ray
CYP2C19*2
: cytochrome P450 2C19
CYP3A
: cytochrome P3A
CYP3A4
: cytochrome P450 3A4
CYP450
: cytochrome P450
DANAMI
: Danish trial in Acute Myocardial Infarction
DAPT
: dual antiplatelet therapy
DBP
: diastolic blood pressure
DECOPI
: Desobstruction Coronaire en Post-Infarctus
DES
: drug-eluting stents
DHP
: dihydropyridine
DSE
: dobutamine stress echocardiography
EACTS
: European Association for Cardiothoracic Surgery
EECP
: enhanced external counterpulsation
EMA
: European Medicines Agency
EASD
: European Association for the Study of Diabetes
ECG
: electrocardiogram
Echo
: echocardiogram
ED
: erectile dysfunction
EF
: ejection fraction
ESC
: European Society of Cardiology
EXCEL
: Evaluation of XIENCE PRIME or XIENCE V vs. Coronary Artery Bypass Surgery for Effectiveness of Left Main Revascularization
FAME
: Fractional Flow Reserve vs. Angiography for Multivessel Evaluation
FDA
: Food & Drug Administration (USA)
FFR
: fractional flow reserve
FREEDOM
: Design of the Future Revascularization Evaluation in patients with Diabetes mellitus: Optimal management of Multivessel disease
GFR
: glomerular filtration rate
HbA1c
: glycated haemoglobin
HDL
: high density lipoprotein
HDL-C
: high density lipoprotein cholesterol
HR
: hazard ratio
HRT
: hormone replacement therapy
hs-CRP
: high-sensitivity C-reactive protein
HU
: Hounsfield units
ICA
: invasive coronary angiography
IMA
: internal mammary artery
IONA
: Impact Of Nicorandil in Angina
ISCHEMIA
: International Study of Comparative Health Effectiveness with Medical and Invasive Approaches
IVUS
: intravascular ultrasound
JSAP
: Japanese Stable Angina Pectoris
KATP
: ATP-sensitive potassium channels
LAD
: left anterior descending
LBBB
: left bundle branch block
LIMA
: Left internal mammary artery
LDL
: low density lipoprotein
LDL-C
: low density lipoprotein cholesterol
LM
: left main
LMS
: left main stem
LV
: left ventricular
LVEF
: left ventricular ejection fraction
LVH
: left ventricular hypertrophy
MACE
: major adverse cardiac events
MASS
: Medical, Angioplasty, or Surgery Study
MDRD
: Modification of Diet in Renal Disease
MERLIN
: Metabolic Efficiency with Ranolazine for Less Ischaemia in Non-ST-Elevation Acute Coronary Syndromes
MERLIN-TIMI 36
: Metabolic Efficiency with Ranolazine for Less Ischemia in Non-ST-Elevation Acute Coronary Syndromes: Thrombolysis In Myocardial Infarction
MET
: metabolic equivalents
MI
: myocardial infarction
MICRO-HOPE
: Microalbuminuria, cardiovascular and renal sub-study of the Heart Outcomes Prevention Evaluation study
MPI
: myocardial perfusion imaging
MRI
: magnetic resonance imaging
NO
: nitric oxide
NSAIDs
: non-steroidal anti-inflammatory drugs
NSTE-ACS
: non-ST-elevation acute coronary syndrome
NYHA
: New York Heart Association
OAT
: Occluded Artery Trial
OCT
: optical coherence tomography
OMT
: optimal medical therapy
PAR-1
: protease activated receptor type 1
PCI
: percutaneous coronary intervention
PDE5
: phosphodiesterase type 5
PES
: paclitaxel-eluting stents
PET
: positron emission tomography
PRECOMBAT
: Premier of Randomized Comparison of Bypass Surgery vs. Angioplasty Using Sirolimus-Eluting Stent in Patients with Left Main Coronary Artery Disease
PTP
: pre-test probability
PUFA
: polyunsaturated fatty acid
PVD
: peripheral vascular disease
QoL
: quality of life
RBBB
: right bundle branch block
REACH
: Reduction of Atherothrombosis for Continued Health
RITA-2
: Second Randomized Intervention Treatment of Angina
ROOBY
: Veterans Affairs Randomized On/Off Bypass
SAPT
: single antiplatelet therapy
SBP
: systolic blood pressure
SCAD
: stable coronary artery disease
SCORE
: Systematic Coronary Risk Evaluation
SCS
: spinal cord stimulation
SES
: sirolimus-eluting stents
SIMA
: single internal mammary artery
SPECT
: single photon emission computed tomography
STICH
: Surgical Treatment for Ischaemic Heart Failure
SWISSI II
: Swiss Interventional Study on Silent Ischaemia Type II
SYNTAX
: SYNergy between percutaneous coronary intervention with TAXus and cardiac surgery
TC
: total cholesterol
TENS
: transcutaneous electrical neural stimulation
TERISA
: Type 2 Diabetes Evaluation of Ranolazine in Subjects With Chronic Stable Angina
TIME
: Trial of Invasive vs. Medical therapy
TIMI
: Thrombolysis In Myocardial Infarction
TMR
: transmyocardial laser revascularization
TOAT
: The Open Artery Trial
WOEST
: What is the Optimal antiplatElet and anticoagulant therapy in patients with oral anticoagulation and coronary StenTing
Guidelines summarize and evaluate all evidence available, at the time of the writing process, on a particular issue with the aim of assisting physicians in selecting the best management strategies for an individual patient with a given condition, taking into account the impact on outcome, as well …
3,879 citations
TL;DR: Routine measurement of FFR in patients with multivessel coronary artery disease who are undergoing PCI with drug-eluting stents significantly reduces the rate of the composite end point of death, nonfatal myocardial infarction, and repeat revascularization at 1 year.
Abstract: Background In patients with multivessel coronary artery disease who are undergoing percutaneous coronary intervention (PCI), coronary angiography is the standard method for guiding the placement of the stent. It is unclear whether routine measurement of fractional flow reserve (FFR; the ratio of maximal blood flow in a stenotic artery to normal maximal flow), in addition to angiography, improves outcomes. Methods In 20 medical centers in the United States and Europe, we randomly assigned 1005 patients with multivessel coronary artery disease to undergo PCI with implantation of drug-eluting stents guided by angiography alone or guided by FFR measurements in addition to angiography. Before randomization, lesions requiring PCI were identified on the basis of their angiographic appearance. Patients assigned to angiography-guided PCI underwent stenting of all indicated lesions, whereas those assigned to FFR-guided PCI underwent stenting of indicated lesions only if the FFR was 0.80 or less. The primary end point was the rate of death, nonfatal myocardial infarction, and repeat revascularization at 1 year. Results The mean (±SD) number of indicated lesions per patient was 2.7±0.9 in the angiography group and 2.8±1.0 in the FFR group (P = 0.34). The number of stents used per patient was 2.7±1.2 and 1.9±1.3, respectively (P<0.001). The 1-year event rate was 18.3% (91 patients) in the angiography group and 13.2% (67 patients) in the FFR group (P = 0.02). Seventy-eight percent of the patients in the angiography group were free from angina at 1 year, as compared with 81% of patients in the FFR group (P = 0.20). Conclusions Routine measurement of FFR in patients with multivessel coronary artery disease who are undergoing PCI with drug-eluting stents significantly reduces the rate of the composite end point of death, nonfatal myocardial infarction, and repeat revascularization at 1 year. (ClinicalTrials.gov number, NCT00267774.)
3,479 citations
Hammersmith Hospital1, Cancer Research UK2, Imperial College London3, University College London4, Royal North Shore Hospital5, Flinders University6, Monash University7, Ain Shams University8, French Institute of Health and Medical Research9, Charité10, University of Oldenburg11, Magna Græcia University12, Catholic University of the Sacred Heart13, University of Verona14, Tokyo Medical University15, Aichi Medical University16, King Abdulaziz Medical City17, Seoul National University Hospital18, Keimyung University19, University of Ulsan20, Inje University21, Universidad Francisco de Vitoria22, University of Amsterdam23, VU University Amsterdam24, Istanbul University25, University of Florence26, Conquest Hospital27, University of Exeter28, Anglia Ruskin University29, Emory University30, United States Department of Veterans Affairs31, University of Washington32, Stony Brook University33, Canterbury Christ Church University34, Duke University35, Hospital Clínico San Carlos36, Complutense University of Madrid37
TL;DR: Coronary revascularization guided by iFR was noninferior to revascularizations guided by FFR with respect to the risk of major adverse cardiac events at 1 year.
Abstract: BackgroundCoronary revascularization guided by fractional flow reserve (FFR) is associated with better patient outcomes after the procedure than revascularization guided by angiography alone. It is unknown whether the instantaneous wave-free ratio (iFR), an alternative measure that does not require the administration of adenosine, will offer benefits similar to those of FFR. MethodsWe randomly assigned 2492 patients with coronary artery disease, in a 1:1 ratio, to undergo either iFR-guided or FFR-guided coronary revascularization. The primary end point was the 1-year risk of major adverse cardiac events, which were a composite of death from any cause, nonfatal myocardial infarction, or unplanned revascularization. The trial was designed to show the noninferiority of iFR to FFR, with a margin of 3.4 percentage points for the difference in risk. ResultsAt 1 year, the primary end point had occurred in 78 of 1148 patients (6.8%) in the iFR group and in 83 of 1182 patients (7.0%) in the FFR group (difference i...
672 citations
TL;DR: Among patients with stable angina or an acute coronary syndrome, an iFR‐ guided revascularization strategy was noninferior to an FFR‐guided revascularized strategy with respect to the rate of major adverse cardiac events at 12 months.
Abstract: BackgroundThe instantaneous wave-free ratio (iFR) is an index used to assess the severity of coronary-artery stenosis. The index has been tested against fractional flow reserve (FFR) in small trials, and the two measures have been found to have similar diagnostic accuracy. However, studies of clinical outcomes associated with the use of iFR are lacking. We aimed to evaluate whether iFR is noninferior to FFR with respect to the rate of subsequent major adverse cardiac events. MethodsWe conducted a multicenter, randomized, controlled, open-label clinical trial using the Swedish Coronary Angiography and Angioplasty Registry for enrollment. A total of 2037 participants with stable angina or an acute coronary syndrome who had an indication for physiologically guided assessment of coronary-artery stenosis were randomly assigned to undergo revascularization guided by either iFR or FFR. The primary end point was the rate of a composite of death from any cause, nonfatal myocardial infarction, or unplanned revascul...
652 citations