Comparison of UFR With QFR in Stable Coronary Artery Disease

Completed

• Conditions: Coronary Artery Disease

• Registration Number: NCT06322355
• Lead Sponsor: Shanghai Zhongshan Hospital

Brief Summary

Quantitative flow reserve (QFR), derived from coronary angiography, has shown high accuracy in detecting significant lesions. Ultrasonic flow ratio (UFR), a new development from IVUS, integrates physiological estimation with intravascular imaging. Although both QFR and UFR are effective, there's no conclusive evidence favoring one over the other. The study aims to compare UFR and QFR's diagnostic performance against the conventional FFR standard in detecting significant coronary lesions.

Detailed Description

Coronary artery disease (CAD) remains a prevalent global health concern, necessitating precise diagnostic strategies for optimal patient management. Fractional Flow Reserve (FFR), defined as the distal-to-proximal pressure ratio across a coronary stenosis during maximal hyperemia and typically measured by a pressure guidewire during coronary angiography (CAG), is considered a gold standard tool for detecting ischemia-causing stenosis and guiding revascularization decisions. However, wire-based FFR has been significantly underutilized due to practical reasons, including its invasive nature and the requirement for hyperemia. Consequently, there is growing interest in developing and validating computational FFR from anatomical information derived from CAG and intravascular imaging modalities, such as intravascular ultrasound (IVUS).

Quantitative flow reserve (QFR), derived from CAG, has been extensively investigated and has demonstrated high diagnostic performance for detecting hemodynamically significant lesions. Beyond CAG, research has indicated that IVUS imaging can also be utilized for computing FFR. IVUS, a widely accepted and powerful modality for evaluating vessel luminal size and characterizing plaque morphology in the context of coronary intervention, has given rise to IVUS-based FFR, known as ultrasonic flow ratio (UFR). UFR has been recently developed, integrating an estimation of physiology with intravascular imaging in the same IVUS pullback. Despite the proven effectiveness of both UFR and QFR, there is currently no evidence supporting the superiority of one technique over the other. In the present study, investigators aim to compare the diagnostic performance of UFR and QFR for the detection of functionally significant coronary lesions, using conventional FFR as the gold standard.

Study Timeline

• Study Start: 2018-07-01
• Primary Completion: 2023-12-31
• Study Completion: 2023-12-31
• Study First Submitted: 2024-01-15
• Status Verified: 2024-03
• Study First Submitted QC: 2024-03-18
• Last Update Submitted: 2024-03-18
• Study First Posted: 2024-03-21
• Last Update Posted: 2024-03-21

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 250

Inclusion Criteria

• Patients who underwent both IVUS imaging and FFR measurement on the same artery

Exclusion Criteria

• Inadequate quality of CAG or IVUS images for QFR or UFR calculation
• Left main or ostial right coronary artery lesion
• The use of balloon predilatation or stent placement prior to FFR measurement or IVUS imaging
• Incomplete IVUS pullback across the entire lesion segment
• The presence of a severe myocardial bridge (defined as ≥30% systolic diameter stenosis) in the examined vessel
• History of previous coronary artery bypass grafting,
• Left ventricular ejection fraction <35%

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Compare diagnostic performance of QFR with UFR	baseline

Secondary Outcome Measures

Name	Time	Method
Correlation and agreement between QFR and UFR	baseline

Trial Locations

Locations (1)

Zhongshan Hospital, Fudan University; 🇨🇳 Shanghai, China