Multicenter Registry for Angiography-Derived Quantitative Flow Ratio

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

524 participants

Study Classification

OBSERVATIONAL

Study Start Date

2016-04-30

Study Completion Date

2023-12-31

Brief Summary

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1. to investigate the feasibility and diagnostic performance of contrast quantitative flow ratio (QFR) for identifying the functional significance of intermediate degree stenotic lesions in all-comer patients with coronary artery disease (CAD) including presentation of acute myocardial infarction (AMI) with non-culprit lesion.
2. to compare the changes of contrast QFR and fractional flow reserve (FFR) according to severity of percent diameter stenosis (%DS)
3. to evaluate prognostic implication of contrast QFR in comparison with FFR

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Detailed Description

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Despite potential clinical benefits and abundant evidences of FFR-guided percutaneous coronary intervention (PCI), adoption rate of FFR is still low in real world practice, most likely due to use of additional resource and to concern about side effects of hyperemic agent. Therefore, several tools to derive FFR non-invasively has been developed based on computational fluid dynamics to overcome the limitations. One of the novel methods, the contrast quantitative flow ratio (QFR) is a computation of FFR based on 3-dimensional quantitative coronary angiography (QCA) combined with Thrombolysis in Myocardial Infarction (TIMI) frame counts adjustment without hyperemic agent infusion.

Although diagnostic performance of contrast QFR for evaluation of functional significance, using FFR as reference standard, is well validated in patients with stable ischemic heart disease (SIHD), there have been lack of evidence regarding the reliability of QFR for non-culprit stenosis in patients with AMI.

Therefore, the investigators sought to investigate the feasibility and diagnostic performance of contrast QFR for identifying the functional significance of coronary stenosis in all-comer patients with CAD. In addition, prognostic implication of contrast QFR will be also compared with that of FFR.

Conditions

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Ischemic Heart Disease

Study Design

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Observational Model Type

CASE_ONLY

Study Time Perspective

RETROSPECTIVE

Study Groups

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QFR Group

Patients with suspected ischemic heart disease including stable angina, or acute coronary syndrome including unstable angina, NSTEMI (non ST-segment elevation myocardial infarction), or STEMI (ST-segment elevation myocardial infarction) with non-culprit stenosis who underwent FFR measurement and were able to analyze QFR.

QFR assessment

Intervention Type DIAGNOSTIC_TEST

QFR measurement in order to evaluate functional significance of epicardial stenosis and to compare the response of QFR for worsening stenosis severity, FFR value as reference standard

Interventions

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QFR assessment

QFR measurement in order to evaluate functional significance of epicardial stenosis and to compare the response of QFR for worsening stenosis severity, FFR value as reference standard

Intervention Type DIAGNOSTIC_TEST

Eligibility Criteria

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Inclusion Criteria

* Subject must be ≥18 years
* Patients suspected with ischemic heart disease
* Patients with intermediate degree of coronary artery stenosis (40-70% stenosis by visual estimation) in major epicardial coronary artery with FFR measurement
* Patients who were able to analyze QFR
* Subject is able to verbally confirm understandings of risks, benefits and treatment alternatives of receiving invasive physiologic evaluation and he/she or his/her legally authorized representative provides

Exclusion Criteria

* Left main (LM) or right coronary artery (RCA) ostial lesion
* Severe overlap of stenotic segments
* Severe tortuosity of target vessel
* Poor angiographic image quality precluding contour detection
* No optimal images with angles ≥ 25o

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No