Functional ComprEhensive AssessmenT by IVUS Reconstruction in Patients With Suspected IschEmic Heart Disease (FEATURE)

Study Overview
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Brief Summary
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Investigating the diagnostic accuracy of online Ultrasonic Flow Ratio (UFR) assessment to identify hemodynamically significant coronary stenosis in patients with suspected ischemic heart disease using angiography-derived fractional flow reserve (FFR) as a reference standard.

Detailed Description
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This is a prospective, single-center, observational registry study of patients with suspected ischemic coronary artery disease. The purpose of this registry is to investigate the accuracy of online UFR assessment to identify hemodynamically significant coronary stenosis in patients with suspected ischemic heart disease using angiography-derived FFR as a reference standard. Study population and sample size calculation are based on the diagnostic performance of previous studies, where an accuracy of 92% was found for UFR. Investigators conservatively estimate the diagnostic accuracy of online UFR assessment as 90% for consecutively enrolled patient population, and with a test target value set as 78% at a two-side significance level of 0.05, statistical power as 90%. Considering incomplete FFR/UFR data of 10% at most, a total of 112 patients need to be enrolled.

Official Title
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Functional ComprEhensive AssessmenT by Intravascular UltrasoUnd Reconstruction in Patients With Suspected IschEmic Coronary Artery Disease (FEATURE)

Conditions
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Ischemic Heart Disease

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subject must be ≥ 18 years Patients suspected with ischemic heart disease ≥ 1 diseased vessel with angiographic percent diameter stenosis between 40% and 80% in a vessel ≥ 2.5mm by visual estimation Target vessels are limited to major epicardial coronary arteries (left anterior descending artery [LAD], left circumflex artery [LCX], right coronary artery [RCA]) Exclusion Criteria: Patients with previous coronary artery bypass grafting (CABG) Myocardial infarction within 72h of coronary angiography Allergy to the contrast agent or adenosine Left main coronary artery stenosis ≥ 50% Target vessel with in-stent restenosis Target vessel with severe tortuosity or angulation 100% occlusion of target vessel Target vessel spasm or injury Target vessel with severe myocardial bridge Target vessel with severe thrombosis Intravascular ultrasound (IVUS) pullback fails to cover the complete target lesion Presence of false lumen at target vessel based on IVUS A serum creatinine level >150 umol/l, or a glomerular filtration rate < 45 ml/kg/1.73 m^2 Heart failure Ineligible for diagnostic intervention (IVUS or FFR examination)

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Diagnostic accuracy of online UFR as compared with FFR | The diagnostic accuracy of online UFR assessment to identify hemodynamically significant coronary stenosis with FFR as the reference standard. | baseline | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Sensitivity and specificity of online UFR as compared with minimum lumen area (MLA) | The superiority in sensitivity and specificity for online UFR in comparison to MLA, when using FFR as a golden standard. | baseline |