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NCT number NCT03420131
Study type Observational
Source Contilia Clinical Research Institute
Contact Christoph Jensen, MD, PHD
Phone 0049-201-897-86222
Email c.jensen@contilia.de
Status Recruiting
Phase N/A
Start date July 18, 2017
Completion date October 1, 2018

Clinical Trial Summary

A Prospective, observational, single center diagnostic study to investigate the the diagnostic agreement between QFR and the pressure wire-based iFR in a real world setting.


Clinical Trial Description

During coronary angiography, intermediate stenoses can not be adequately assessed by visual assessment alone. It is necessary to evaluate the functional significance to guide their treatment.

Fractional Flow Reserve (FFR) is the current gold standard for determining this functional significance but its adoption in clinical practice remains low. The instantaneous wave-free ratio (iFR) is an alternative way to determine the flow-limiting characteristics of a coronary stenosis with a pressure wire but without the need to induce hyperemia. Large randomised trials have confirmed the non-inferiority of iFR in respect to FFR in terms of outcome.

Quantitative Flow Ratio (QFR) is another new method for evaluating the functional significance of coronary stenosis It is a software-based analysis of conventional angiographic images to estimate the pressure drop caused by a coronary stenosis. The diagnostic agreement with FFR seemed promising in the FAVOR Pilot Study and a larger trial is enrolling for confirmation.

A stepwise approach of QFR and iFR could make the functional assessment of intermediate stenoses more practical and cost-effective. However before being used as a combination in daily practice, QFR has to be validated in respect to iFR.

The primary objective of the trial is to investigate the diagnostic agreement between QFR and the pressure wire-based iFR in a real world setting


Study Design


Related Conditions & MeSH terms


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