DEFINE-FLOW: Combined Pressure and Flow Measurements to Guide Treatment of Coronary Stenoses
Study Details
Study Description
Brief Summary
This study evaluates the prognostic value and therapeutic potential of combined pressure and flow measurements when evaluating a coronary artery stenosis. Lesions with intact coronary flow reserve (CFR) despite a reduced fractional flow reserve (FFR) will receive optimal medical therapy. Only lesions with a simultaneous reduction in both CFR and FFR will be treated with percutaneous coronary intervention (PCI).
| Condition or Disease | Intervention/Treatment | Phase |
|---|---|---|
|
N/A |
Detailed Description
Pressure and flow represent the two physiologic variables that can be measured directly inside a coronary artery. Already pressure measurements have proven their clinical value in the form of fractional flow reserve (FFR). However, myocardial function can remain intact with sufficient flow, even at a low perfusion pressure. Therefore, combined pressure and flow measurements provide a more complete description of physiologic stenosis severity as a guide to medical treatment versus revascularization. Based on existing work relating the most common flow measurement, coronary flow reserve (CFR), to FFR and linking both variables with subsequent prognosis, we hypothesize that lesions with an intact CFR>=2.0 can be reasonably treated with medical therapy despite a reduced FFR<=0.8.
Study Design
Arms and Interventions
| Arm | Intervention/Treatment |
|---|---|
| Other: All patients All lesions undergo simultaneous assessment with a combined pressure and flow sensor |
Other: Percutaneous coronary intervention (PCI)
For lesions with both FFR<=0.8 and CFR<2.0
Other: Optimal medical therapy (OMT)
For lesions with FFR>0.8 or CFR>=2.0 or both
|
Outcome Measures
Primary Outcome Measures
- Major adverse cardiac events [24 months]
All-cause death, non-fatal myocardial infarction, urgent and elective revascularization
Secondary Outcome Measures
- Angina (Canadian Cardiovascular Society (CCS) anginal class (or freedom from angina) [24 months]
Canadian Cardiovascular Society (CCS) anginal class (or freedom from angina)
Eligibility Criteria
Criteria
Inclusion Criteria:
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Age ≥ 18 years.
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Eligible for PCI based on local practice standards during the current procedure (PCI cannot be staged).
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At least one epicardial stenosis of ≥50% diameter (by visual or quantitative assessment) and meeting the following criteria as determined by the operator based on either a prior or the current diagnostic angiogram:
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<100% diameter (not a chronic, total occlusion);
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in a native coronary artery (including side branches but excludes bypass grafts);
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of ≥2.5mm reference diameter (near the level of the stenosis);
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and supplies sufficiently viable myocardium (exclude regions of known, prior, transmural myocardial infarction).
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Ability to understand and the willingness to sign a written informed consent.
Exclusion Criteria:
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Anatomic exclusions:
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Prior CABG.
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Preferred treatment strategy for revascularization would be CABG based on local practice standards.
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Left main coronary artery disease requiring revascularization.
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Extremely tortuous or calcified coronary arteries precluding intracoronary physiologic measurements. Operators may also exclude subtotal or similar high-grade lesions, which in their judgment may be threatened by ComboWire placement.
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Known severe LV hypertrophy (septal wall thickness at echocardiography of >13 mm).
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Clinical exclusions:
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Inability to receive intravenous adenosine (for example, severe reactive airway disease, marked hypotension, or high-grade AV block without pacemaker).
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Recent (within 3 weeks prior to cardiac catheterization) ST-segment elevation myocardial infarction (STEMI) in any arterial distribution (not specifically target lesion).
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Culprit lesions (based on clinical judgment of the operator) for either STEMI or non-STEMI cannot be included.
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Severe cardiomyopathy (LV ejection fraction <30%).
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Planned need for cardiac surgery (for example, valve surgery, treatment of aortic aneurysm, or septal myomectomy).
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General exclusions:
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A life expectancy of less than 2 years.
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Inability to sign an informed consent, due to any mental condition that renders the subject unable to understand the nature, scope, and possible consequences of the trial or due to mental retardation or language barrier.
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Potential for non-compliance towards the requirements for follow-up visits.
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Participation or planned participation in another cardiovascular clinical trial before completing the 24 month follow-up.
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | Aarhus University Hospital | Aarhus | Denmark | ||
| 2 | Catholic University of the Sacred Heart | Rome | Italy | ||
| 3 | Gifu Heart Center | Gifu | Japan | ||
| 4 | Toda Central General Hospital | Toda | Japan | ||
| 5 | Tokyo Medical University | Tokyo | Japan | ||
| 6 | Tsuchiura Kyodo | Tsuchiura | Japan | ||
| 7 | Amsterdam UMC - location AMC | Amsterdam | Netherlands | ||
| 8 | Amsterdam UMC - location VUmc | Amsterdam | Netherlands | ||
| 9 | Tergooi Hospital | Blaricum | Netherlands | ||
| 10 | Amphia Hospital | Breda | Netherlands | ||
| 11 | Hospital Clinico San Carlos | Madrid | Spain | ||
| 12 | Royal Free Hospital | London | United Kingdom |
Sponsors and Collaborators
- The University of Texas Health Science Center, Houston
- Academisch Medisch Centrum - Universiteit van Amsterdam (AMC-UvA)
- Volcano Corporation
Investigators
- Principal Investigator: Nils Johnson, MD, University of Texas Medical School at Houston
- Study Director: Jan J Piek, MD, PhD, Academic Medical Center (AMC), Amsterdam
Study Documents (Full-Text)
None provided.More Information
Publications
- Johnson NP, Kirkeeide RL, Gould KL. Is discordance of coronary flow reserve and fractional flow reserve due to methodology or clinically relevant coronary pathophysiology? JACC Cardiovasc Imaging. 2012 Feb;5(2):193-202. doi: 10.1016/j.jcmg.2011.09.020.
- van de Hoef TP, van Lavieren MA, Damman P, Delewi R, Piek MA, Chamuleau SA, Voskuil M, Henriques JP, Koch KT, de Winter RJ, Spaan JA, Siebes M, Tijssen JG, Meuwissen M, Piek JJ. Physiological basis and long-term clinical outcome of discordance between fractional flow reserve and coronary flow velocity reserve in coronary stenoses of intermediate severity. Circ Cardiovasc Interv. 2014 Jun;7(3):301-11. doi: 10.1161/CIRCINTERVENTIONS.113.001049. Epub 2014 Apr 29.
- HSC-MS-14-0442
- NL48375.018.14