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Determination of Instantaneous Wave-Free Ratio by Computed Tomography (iFRCT)

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified December 2012 by Shanghai 10th People's Hospital.
Recruitment status was:  Active, not recruiting
Information provided by (Responsible Party):
Ya-Wei Xu, Shanghai 10th People's Hospital Identifier:
First received: December 4, 2012
Last updated: December 10, 2012
Last verified: December 2012
The iFRCT study is a prospective, multicenter study to evaluate the diagnostic performance of iFRCT with the use of ≥64-detector row CT scanners for the detection and exclusion of significant obstructive coronary artery disease, defined by invasive fractiona flow reserve (FFR) as the reference standard.

Condition Intervention
Coronary Artery Disease
Device: PressureWire™ Certus(St. Jude Medical Systems, Sweden)

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Double Blind (Participant, Care Provider, Investigator)
Primary Purpose: Diagnostic
Official Title: Diagnostic Performance of Instantaneous Wave-Free Ratio From Computed Tomography

Resource links provided by NLM:

Further study details as provided by Shanghai 10th People's Hospital:

Primary Outcome Measures:
  • Diagnostic Accuracy of iFRCT [ Time Frame: 1 day ]
    Diagnostic accuracy[Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV)]* of CCTA plus iFRCT(instantaneous wave-free ratio calculated in reconstructed heart model) or iFRCT alone to determine presence or absence of at least one hemodynamically (HD)-significant coronary artery stenosis at the subject level using binary outcomes when compared to FFR as the reference standard.*Sensitivity measures the proportion of actual positives which are correctly identified. Specificity measures the proportion of negatives which are correctly identified;PPV, or precision rate is the proportion of positive test results that are true positives (such as correct diagnoses);NPV is defined as the proportion of subjects with a negative test result who are correctly diagnosed.

Secondary Outcome Measures:
  • Diagnostic accuracy of iFRCT at the subject level [ Time Frame: 1 day ]
    Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of CCTA plus iFRCT or iFRCT alone at the subject level using binary outcomes when compared to FFR as the reference standard.

  • Diagnostic accuracy of iFRCT at the vessel level [ Time Frame: 1 day ]
    Sensitivity, specificity, PPV and NPV of CCTA plus iFRCT or iFRCT alone for the presence or absence of HD-significant coronary artery stenosis at the vessel level using binary outcomes when compared to FFR as the reference standard.

  • FFR Numerical Correlation [ Time Frame: 1 day ]
    Per-vessel correlation of the iFRCT numerical value alone with the FFR numerical value measured during cardiac catheterization.

  • FFRCT Numerical Correlation [ Time Frame: 1 day ]
    Per-vessel correlation of the iFRCT numerical value alone with the FFRCT numerical value calculated from the computed tomography.

  • Predicted Post-PCI FFR Measurement [ Time Frame: 1 day ]
    Diagnostic accuracy of predicted post-percutaneous intervention (PCI) iFRCT alone to determine success or failure of PCI* using binary outcomes when compared to post-PCI FFR at the subject and vessel level using PCI as the reference standard.*PCI success will be defined as post-PCI FFR>0.80, while PCI failure will be defined as post-PCI FFR≤0.80 during adenosine-mediated hyperemia.

Estimated Enrollment: 100
Study Start Date: December 2012
Estimated Study Completion Date: August 2014
Estimated Primary Completion Date: June 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Single arm study
Single arm study.The investigators will conducte computed tomography,angiography and FFR measurement during angiography in this single arm.
Device: PressureWire™ Certus(St. Jude Medical Systems, Sweden)
Fractional flow reserve measured during cardiac catheterization——A pressure-monitoring guidewire(PressureWire Certus, St. Jude Medical Systems, Uppsala, Sweden) will be advanced past the stenosis.

Detailed Description:

Noninvasive fractional flow reserve (FFR) computed from CT (FFRCT) is a novel method for determining the physiologic significance of coronary artery disease (CAD), and several clinical trials have revealed that the FFRCT has a good correlation with invasive FFR, also use of noninvasive FFRCT plus Computed Tomography (CT ) among stable patients with suspected or known CAD was associated with improved diagnostic accuracy and discrimination vs CT alone for the diagnosis of hemodynamically significant CAD.

The cornerstone of FFR is the linear relationship between pressure and flow under conditions of constant (and minimized) intracoronary resistance, so is FFRCT. Under such conditions, pressure and flow are assumed to be directly proportional, and a decrease in pressure across a stenosis reflects a decrease in blood flow to the dependent myocardium. However, even after administration of potent pharmacologic agents such as adenosine, intracoronary resistance is not static, but instead fluctuates in a phasic pattern throughout the cardiac cycle. In addition, for patients who are allergic to pharmacologic agents or with sever lesions which response little to pharmacologic agents, the measurement of FFR is challenging and the lesion are always underestimated. The ADVISE trial revealed that intracoronary resistance is naturally constant and minimized during the wave-free period. The instantaneous wave-free ratio calculated over this period produces a drug-free index of stenosis severity comparable to FFR. But whether iFR calculated from Computed Tomography(iFRCT) is comparable to FFRCT or FFR, and its diagnostic performance remains unknown. Thus the investigators conduct this trial to assess the diagnostic performance of Instantaneous Wave-Free Ratio for diagnosis of hemodynamically significant coronary stenosis.

Instantaneous Wave-Free Ratio calculated from reconstructed heart model.Wave-intensity analysis identified a wave-free period in which intracoronary resistance at rest is similar in variability and magnitude.The investigators define the resting distal-to-proximal pressure ratio during this period as the instantaneous wave-free ratio (iFR).


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Coronary computed tomographic angiography(CCTA) with over 50 percent stenosis in a major coronary artery over 2mm diameter
  • Undergoing clinically indicated invasive coronary angiography with FFR

Exclusion Criteria:

  • A history of CABG surgery
  • Prior percutaneous coronary intervention with suspected instent restenosis
  • Suspicion of or recent acute coronary syndrome
  • Complex congenital heart disease
  • Prior pacemaker or defibrillator
  • Prosthetic heart valve
  • Significant arrhythmia
  • heart rate >100 beats/min
  • systolic blood pressure≤90 mmHg
  • contraindication to beta blockers, nitroglycerin or adenosine
  • Serum creatinine level greater than 1.5 mg per dL
  • Allergy to iodinated contrast
  • Pregnant state
  • Body mass index greater than 35
  • Evidence of active clinical instability or lifethreatening disease
  • Canadian Cardiovascular Society class IV angina
  • nonevaluable CCTA as determined by the CCTA core laboratory
  • Inability to adhere to study procedures
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Please refer to this study by its identifier: NCT01747031

Department of Cardiology, Shanghai Tenth People's Hospital
Shanghai, China, 200072
Sponsors and Collaborators
Shanghai 10th People's Hospital
Principal Investigator: Ya-Wei Xu, MD, FACC Department of Cardiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine
  More Information

Additional Information:
Responsible Party: Ya-Wei Xu, MD FACC, Shanghai 10th People's Hospital Identifier: NCT01747031     History of Changes
Study First Received: December 4, 2012
Last Updated: December 10, 2012

Keywords provided by Shanghai 10th People's Hospital:
instantaneous wave-free ratio
fractional flow reserve

Additional relevant MeSH terms:
Coronary Artery Disease
Myocardial Ischemia
Coronary Disease
Heart Diseases
Cardiovascular Diseases
Arterial Occlusive Diseases
Vascular Diseases processed this record on May 24, 2017