Ischemia and No Obstructive Coronary Artery DiseaseDISCOVER INOCANCT05288361
The DISCOVER INOCA Prospective Multi-center Registry
An observational study of Ischemia and No Obstructive Coronary Artery Disease and Coronary Microvascular Dysfunction, run by Yale University at 9 sites in United States.
Trial summary
The overall objective of this multi-center registry is to identify specific phenotypes of INOCA with both an anatomic evaluation (coronary angiography and intravascular imaging) and physiologic assessment with the Abbott Coroventis Coroflow Cardiovascular System, and to determine long-term outcomes. Read more about this study
- Who is it for?
- Ages 18 years and olderHealthy volunteers can take part
- Conditions the study is for
- Ischemia and No Obstructive Coronary Artery Disease, Coronary Microvascular Dysfunction, Coronary Vasospasm
- What is being tested?
- Coroventis Coroflow Cardiovascular System and PressureWire™ X Guidewire
- How many people
- 500 participants
- Where
- 9 sitesUnited States
- Study dates
- 14 Sep 2022to 31 Dec 2032
- How long will I take part?
- 5 Years
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Study population: Adults referred to the catheterization laboratory for evaluation of suspected ischemic heart disease, and who are deemed to have non-obstructive coronary artery disease based on coronary angiography or non-ischemic fractional flow reserve (FFR) or resting free cycle ratio (RFR).
Who may be able to join
- Suspected ischemic heart disease and is referred to undergo clinically indicated invasive coronary angiography
- No obstructive coronary artery disease (CAD) as defined by operator visual assessment with (1) angiographically normal coronary arteries OR (2) non-obstructive CAD with angiographic stenosis < 50%, or greater than or equal to 50 but < 70% with FFR greater than or equal to 0.81 or RFR greater than or equal to 0.90
- Willing to comply with specified follow-up evaluations. The participant or legally authorized representative has been informed of the nature of the study, agrees to its provisions, and has been provided written informed consent approved by the appropriate Institutional Review Board (IRB) or Ethics Committee (EC)
Who cannot join
- Pregnant or nursing
- Any myocardial infarction at index presentation or within 90 days prior to enrollment, defined as any electrocardiogram diagnostic for myocardial infarction OR elevation in serum troponin greater than the upper limit of the site-defined reference range
- Known left ventricular ejection fraction < 50% or cardiogenic shock requiring pressors or mechanical circulatory assistance (e.g., intra-aortic balloon pump, left ventricular assist device, other temporary cardiac support blood pump)
- Renal insufficiency, defined as estimated glomerular filtration rate (eGFR) <30 mL/min/1.73 m2 (by the Modification of Diet in Renal Disease equation) or dialysis at the time of screening
- Prior percutaneous coronary intervention
- Planned percutaneous coronary intervention (PCI)
Show all 20Show fewer
- Prior coronary artery bypass graft surgery
- Prior ST-elevation myocardial infarction
- History of hypertrophic cardiomyopathy
- History of infiltrative heart disease (e.g., cardiac amyloidosis)
- New York Heart Association Class IV congestive heart failure
- Severe mitral regurgitation
- Severe aortic stenosis
- Severe pulmonary hypertension (Mean pulmonary artery pressure greater than or equal to 35mmHg or echocardiographic right ventricular systolic pressure greater than or equal to 60mmHg)
- Known history of unrepaired or repaired congenital heart disease
- Past or pending heart transplant, or on the waiting list for organ transplant
- Known other medical illness or known history of substance abuse that may cause non-compliance with the protocol, or is associated with a life expectancy of less than 1 year
- Current or planned participation in a study of an investigational therapy
- Angiographic stenosis in any major epicardial vessel ≥ 70% by visual estimate
- Angiographic stenosis in any major epicardial vessel greater than or equal to 50% and < 70% by visual estimate with FFR less than or equal to 0.80 or RFR less than or equal to 0.89
Trial locations and contacts
9 sites in 1 country.
9 sites in 1 country
United States9 sites
New York Presbyterian-Brooklyn Methodist Hospital
Brooklyn, New York, 11215
The Christ Hospital
Cincinnati, Ohio, 45219
Northeast Georgia Medical Center
Gainesville, Georgia, 30501
UCLA Health
Los Angeles, California, 90095
Yale New Haven Hospital
New Haven, Connecticut, 06520
NYU Langone Health
New York, New York, 10010
Columbia University Irving Medical Center
New York, New York, 10032
Thomas Jefferson University Hospital
Philadelphia, Pennsylvania, 19107
Stanford Hospital
Stanford, California, 94305
About this study
Official title: Determining the Cause of Coronary Vasomotor Disorders in Patients With Ischemia and No Obstructive Coronary Artery Disease
The overall objective of this multi-center registry is to identify specific phenotypes of INOCA with both an anatomic evaluation (coronary angiography and intravascular imaging) and physiologic assessment with the Abbott Coroventis Coroflow Cardiovascular System, and to determine long-term outcomes.
Read the detailed description
This is a prospective, multicenter, registry of stable patients with ischemia and no obstructive coronary artery disease (INOCA) evaluated by coronary angiography, intravascular imaging, and physiologic measurements obtained on the Coroventis Coroflow Cardiovascular System.
The Coroventis Coroflow Cardiovascular System and PressureWire™ X Guidewire (Abbott, Abbott Park, IL) are a device combination consisting of a physiology wire with wireless transmitter (Wi-Box), CoroHub Receiver, and CoroFlow Software. The PressureWire™ X guidewire is a hydrophilic-coated wire with pressure and temperature sensors that is capable of measuring physiologic indices including fractional flow reserve (FFR), resting full cycle ratio (RFR), coronary flow reserve (CFR), and the index of microcirculatory resistance (IMR). The guidewire wirelessly transmits pressure and temperature data via the Wi-Box to the CoroHub Receiver and CoroFlow Software, which is a software interface designed to display pressure measurements, thermodilution curves, and physiologic indices. This registry will enroll 500 subjects at up to 10 sites in the United States that use the Abbott Coroventis Coroflow Cardiovascular System.
The overall objective of this multi-center registry is to identify specific phenotypes of INOCA with both an anatomic evaluation (coronary angiography and intravascular imaging) and physiologic assessment with the Abbott Coroventis Coroflow Cardiovascular System, and to determine long-term outcomes. Specific goals include:
- Describe the prevalence of the following INOCA phenotypes: coronary microvascular dysfunction (CMD), vasospastic angina, mixed CMD/vasospastic angina, other disorders of coronary physiology, and non-cardiac chest pain;
- Characterize the burden of epicardial coronary artery atherosclerosis and myocardial bridging (MB) by angiography and intracoronary imaging (intravascular ultrasound or optical coherence tomography) in patients with INOCA;
- Characterize the natural history and outcomes of patients with INOCA and determine variables associated with major adverse cardiovascular events
- Conditions
- Ischemia and No Obstructive Coronary Artery Disease, Coronary Microvascular Dysfunction, Coronary Vasospasm, Endothelial Dysfunction, Microvascular Angina, Chest Pain With Normal Coronary Angiography
- Being tested
- Coroventis Coroflow Cardiovascular System and PressureWire™ X Guidewire
- Medical subject headings
- Ischemia, Coronary Vasospasm, Microvascular Angina
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Coroventis Coroflow Cardiovascular System and PressureWire™ X GuidewireDiagnostic test
Also called Acetylcholine Provocation
Patients presenting with symptomatic ischemic heart disease (including chronic stable angina or unstable angina) without evidence of myocardial infarction who require elective or urgent cardiac catheterization, and who meet all eligibility criteria will be enrolled.
Participants will undergo routine coronary angiography as well as comprehensive physiologic assessment with intracoronary acetylcholine provocation for diagnosis of vasospastic angina (VSA), coronary thermodilution to evaluate for coronary microvascular dysfunction (CMD), and intracoronary imaging with optical coherence tomography (OCT) or intravascular ultrasound (IVUS) to evaluate for the presence of atheroma, plaque burden, and myocardial bridging.
What is being measured
The primary outcome is the main question the study is designed to answer.
The proportion of subjects with each physiologic phenotypes diagnosed with the Coroflow Cardiovascular System will be reported within 24-48 hours of the procedure.
The following phenotypes will be captured: Coronary microvascular dysfunction (CMD)- Criteria for a diagnosis of CMD include an abnormal Index of Microcirculatory Resistance (IMR) ≥ 25 and/or impaired Coronary Flow Reserve (CFR) ≤ 2.0; Vasospastic angina (VSA): Includes coronary vasospasm, microvascular spasm, and endothelial dysfunction. Criteria for coronary vasospasm include ≥ 90% narrowing of the epicardial vessel during acetylcholine testing and either or both angina and transient ischemic EKG changes. Microvascular spasm includes angina and/or ischemic EKG changes in the absence of spasm of the epicardial vessel during acetycholine infusion; Endothelial dysfunction as defined as angiographic diameter change less than or equal to 0% and but not greater than -89% in response to acetylcholine infusion; Mixed CMD/VSA; Any other disorders of coronary physiology.
Measured: up to 48 hours after the procedure
The proportion of subjects that experience Major Adverse Cardiovascular Events (MACE)
The proportion of subjects that experience Major Adverse Cardiovascular Events (MACE) as reported by the clinical study sites and adjudicated by the Clinical Events Committee (CEC). Reports may come from the clinical site or self report. MACE defined as a composite of cardiovascular death, myocardial infarction, hospitalization for cardiovascular causes or coronary revascularization.
Measured: Up to 5 years
The proportion of subjects that exhibit mild, moderate or severe coronary artery stenosis
The proportion of subjects that exhibit mild, moderate or severe coronary artery stenosis as measured by Optical Coherence Tomography (OCT), Intravascular Ultrasound (IVUS) or Quantitative Coronary Angiography (QCA). Mild stenosis is defined as less than or equal to 30%, Moderate stenosis is defined as 31%-69%, and severe stenosis is greater than or equal to 70%. The measurements will take place during the procedure and the analysis will be completed by a central core lab.
Measured: At the time of the procedure
Lesion length during the procedure
Lesion length during the procedure will be determined for each subject by the use of OCT, IVUS or QCA and the analysis will be completed by a central core lab. Lesion length will be defined by either less than 15mm or equal to or greater than 15mm.
Measured: At the time of the procedure
Secondary outcomes (17)
The proportion of subjects that experience Major Adverse Cardiovascular and Cerebrovascular Events (MACCE) at any time during the study.
The proportion of subjects that experience Major Adverse Cardiovascular and Cerebrovascular Events (MACCE) at any time during the study as reported by the clinical site or self report. MACCE is defined as MACE and/or any stroke (NeuroARC definition) and adjudicated by the CEC.
Measured: Up to 5 Years
The proportion of subjects that die at any time in the study
The proportion of subjects that die at any time in the study as reported by the clinical site or the subject's family. The cause of death will be further defined as cardiovascular, and non-cardiovascular mortality as adjudicated by the CEC.
Measured: Up to 5 years
The proportion of subjects that experience a Myocardial Infarction (MI) at any time during the study.
The proportion of subjects that experience a Myocardial Infarction (MI) at any time during the study as reported by the clinical site or self report. Fourth Universal Definition will be used to determine MI type and will be adjudicated by the CEC.
Measured: Up to 5 Years
The proportion of subjects that experience a stroke at any time during the study.
The proportion of subjects that experience a stroke at any time during the study as reported by the clinical site or self report. NeuroARC definition will be used to classify the type of stroke and will be adjudicated by the CEC.
Measured: Up to 5 years
The proportion of subjects that require revascularization of their coronary arteries at any time during the study.
Reports may come from the clinical site or self report. Revascularization will further be defined as Percutaneous Coronary Intervention (PCI) or Coronary Artery Bypass Graft (CABG) and will be adjudicated by the CEC.
Measured: Up to 5 years
The proportion of subjects that experience a hospitalization at any time during the study.
The proportion of subjects that experience a hospitalization at any time during the study as reported by the clinical site or self report. The reason for hospitalization will be further classified as Cardiovascular related or Heart Failure and adjudicated by the CEC
Measured: Up to 5 years
The proportion of subjects that require repeat coronary angiography at any time during the study.
The proportion of subjects that require repeat coronary angiography at any time during the study as reported by the clinical site or self report. Reported events will be adjudicated by the CEC.
Measured: Up to 5 years
The proportion of subjects with coronary lesions that experience progression to obstructive Coronary Artery Disease (CAD) at any time during the study.
The proportion of subjects with coronary lesions that experience progression to obstructive Coronary Artery Disease (CAD) at any time during the study as reported by the clinical site or self report, and will be adjudicated by the CEC.
Measured: Up to 5 years
Proportion of subjects that experience major bleeding at any time during the study using the Bleeding Academic Research Consortium (BARC) bleeding type
Proportion of subjects that experience major bleeding at any time during the study using the BARC bleeding type. Reports may come from the clinical site or self report. Bleeding types on a scale from 0 (no bleeding) to 5 (fatal bleeding). Major bleeding is defined as categories BARC 3-5 and will be adjudicated by the CEC.
Measured: Up to 5 years
Proportion of subjects that experience Major Vascular Complications at any time during the study.
Proportion of subjects that experience Major Vascular Complications at any time during the study as reports by the clinical site or self report, and will be adjudicated by the CEC.
Measured: Up to five 5 years
Proportion of subjects that experience a composite of death, stroke, and MI at any time during the study.
Proportion of subjects that experience a composite of death, stroke, and MI at any time during the study as reported by the clinical site or self report, and will be adjudicated by the CEC.
Measured: Up to 5 years
Change from baseline in proportion of subjects that experience each classification of angina status during the study.
The angina status will be assessed using the Canadian Cardiovascular Society (CCS) class or Braunwald Unstable Angina classification. The angina type will be classified at the time of the procedure, at 30 days, 6 months, 1 year, and then annually up to 5 years.
Measured: At baseline, 30 days, 6 months, 1 year, 2 years, 3 years, 4 years, and 5 years
The change in baseline of angina symptoms for each subject. The angina status will be classified at the time of the procedure, at 30 days, 6 months, 12months and then annually up to 5 years.
The change in baseline of angina symptoms for each subject as assessed by the Seattle Angina Questionaire. The Seattle Angina Questionnaire (SAQ) contains 19 questions used to measure health status in patients with coronary artery disease (CAD). The SAQ directly measure patients' current health status: Physical Limitation, Angina Frequency, and Quality of Life. The SAQ results in 3 domain scores as well as an overall summary score.
Measured: At baseline, 30 days, 6 months, 1 year, 2 years, 3 years, 4 years, and 5 years
The change in the quality of life (QOL) from baseline for each subject will be assessed using the QOL EQ-5D-5L questionnaire.
QOL will be assessed by EQ-5D-5L. The EQ-5D-5L consists of 2 pages: the EQ-5D descriptive system and the EQ visual analogue scale (EQ VAS).QOL will be determined at the time of the procedure, at 30 days, 6 months, 12months and then annually up to 5 years.
The descriptive system comprises five dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each dimension has 5 levels: no problems, slight problems, moderate problems, severe problems and extreme problems. The patient is asked to indicate his/her health state by ticking the box next to the most appropriate statement in each of the five dimensions. This decision results in a 1-digit number that expresses the level selected for that dimension. The digits for the five dimensions can be combined into a 5-digit number that describes the patient's health state.
Measured: At baseline, 30 days, 6 months, 1 year, 2 years, 3 years, 4 years, and 5 years
The change in depression status from baseline for each subject assessed by the Patient Health Questionnaire (PHQ)-8 questionnaire.
Depression status will be assessed by the PHQ-8 questionnaire. The PHQ-8 is a series of 8 questions will four possible answers each. The questions focus on over-all well-being as well as daily habits. The higher the score the more the patient is likely to be depressed. Depression status will be determined at the time of the procedure, at 30 days, 6 months, 12months and then annually up to 5 years.
Measured: At baseline, 30 days, 6 months, 1 year, 2 years, 3 years, 4 years, and 5 years
The change in anxiety status from baseline for each subject. will be assessed by the Generalized Anxiety Disorder (GAD)-7 questionnaire.
Anxiety status will be assessed by the GAD-7 questionnaire. The GAD-7 is a series of 7 questions will four possible answers each. The questions focus on over-all well-being as well as daily habits. The higher the score the more the patient is likely to be anxious. Anxiety status will be determined at the time of the procedure, at 30 days, 6 months, 12months and then annually up to 5 years.
Measured: At baseline, 30 days, 6 months, 1 year, 2 years, 3 years, 4 years, and 5 years
The proportion of subjects that experience a series of procedural outcomes as assessed by the site and adjudicated by the CEC.
Procedural outcomes will be categorized into the following: Reclassification from pre-procedure diagnosis (including non-cardiac chest pain); Completion of the interventional diagnostic procedure without device-related serious adverse events or major angiographic complications; Frequency of major angiographic complications (device-related coronary artery dissection [greater than type C], slow or no flow, or perforation)
Measured: Up to 48 hours after the procedure
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted21 Mar 2022
- Study start14 Sep 2022
- Primary completion31 Dec 2032 (estimated)
- Study completion31 Dec 2032 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Ischemia and No Obstructive Coronary Artery DiseaseStudies of the same condition, open and under way.
- More trials run by Yale UniversityThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 500 participants (estimated)
- Target duration
- 5 Years
Sponsor and investigators
- Lead sponsor
- Yale University
- Sponsor type
- University, hospital or other
- Collaborators
- Abbott
- Responsible party
- Sponsor
- Investigators
- Samit Shah, MD, PhD, Principal investigator, Yale University Medical SchoolAlexandra Lansky, MD, Principal investigator, Yale University Medical School
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05288361
- Sponsor's protocol ID
- YSI-001
- Acronym
- DISCOVER INOCA
- Status last verified
- Oct 2026
- First submitted
- 9 Mar 2022
- Last updated
- 23 Oct 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 23 Oct 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Determining the Cause of Coronary Vasomotor Disorders in Patients With Ischemia and No Obstructive Coronary Artery Disease
- ClinicalTrials.gov ID
- NCT05288361
- Acronym / sponsor ID
- DISCOVER INOCA / YSI-001
- Conditions
- Ischemia and No Obstructive Coronary Artery Disease, Coronary Microvascular Dysfunction, Coronary Vasospasm, Endothelial Dysfunction, Microvascular Angina, Chest Pain With Normal Coronary Angiography
- Study type
- Observational
- Recruitment status
- Active, not recruiting
- Enrolment
- 500 participants (estimated)
- Lead sponsor
- Yale UniversityUniversity, hospital or other
- Collaborators
- Abbott
- Study start
- 14 Sep 2022 (actual)
- Primary completion
- 31 Dec 2032 (estimated)
- Study completion
- 31 Dec 2032 (estimated)
- First posted
- 21 Mar 2022 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The overall objective of this multi-center registry is to identify specific phenotypes of INOCA with both an anatomic evaluation (coronary angiography and intravascular imaging) and physiologic assessment with the Abbott Coroventis Coroflow Cardiovascular System, and to determine long-term outcomes.
Detailed description
This is a prospective, multicenter, registry of stable patients with ischemia and no obstructive coronary artery disease (INOCA) evaluated by coronary angiography, intravascular imaging, and physiologic measurements obtained on the Coroventis Coroflow Cardiovascular System.
The Coroventis Coroflow Cardiovascular System and PressureWire™ X Guidewire (Abbott, Abbott Park, IL) are a device combination consisting of a physiology wire with wireless transmitter (Wi-Box), CoroHub Receiver, and CoroFlow Software. The PressureWire™ X guidewire is a hydrophilic-coated wire with pressure and temperature sensors that is capable of measuring physiologic indices including fractional flow reserve (FFR), resting full cycle ratio (RFR), coronary flow reserve (CFR), and the index of microcirculatory resistance (IMR). The guidewire wirelessly transmits pressure and temperature data via the Wi-Box to the CoroHub Receiver and CoroFlow Software, which is a software interface designed to display pressure measurements, thermodilution curves, and physiologic indices. This registry will enroll 500 subjects at up to 10 sites in the United States that use the Abbott Coroventis Coroflow Cardiovascular System.
The overall objective of this multi-center registry is to identify specific phenotypes of INOCA with both an anatomic evaluation (coronary angiography and intravascular imaging) and physiologic assessment with the Abbott Coroventis Coroflow Cardiovascular System, and to determine long-term outcomes. Specific goals include:
- Describe the prevalence of the following INOCA phenotypes: coronary microvascular dysfunction (CMD), vasospastic angina, mixed CMD/vasospastic angina, other disorders of coronary physiology, and non-cardiac chest pain;
- Characterize the burden of epicardial coronary artery atherosclerosis and myocardial bridging (MB) by angiography and intracoronary imaging (intravascular ultrasound or optical coherence tomography) in patients with INOCA;
- Characterize the natural history and outcomes of patients with INOCA and determine variables associated with major adverse cardiovascular events
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Target follow-up
- 5 Years
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
- Study population
- Adults referred to the catheterization laboratory for evaluation of suspected ischemic heart disease, and who are deemed to have non-obstructive coronary artery disease based on coronary angiography or non-ischemic fractional flow reserve (FFR) or resting free cycle ratio (RFR).
Key inclusion criteria (3 listed)
- Suspected ischemic heart disease and is referred to undergo clinically indicated invasive coronary angiography
- No obstructive coronary artery disease (CAD) as defined by operator visual assessment with (1) angiographically normal coronary arteries OR (2) non-obstructive CAD with angiographic stenosis < 50%, or greater than or equal to 50 but < 70% with FFR greater than or equal to 0.81 or RFR greater than or equal to 0.90
- Willing to comply with specified follow-up evaluations. The participant or legally authorized representative has been informed of the nature of the study, agrees to its provisions, and has been provided written informed consent approved by the appropriate Institutional Review Board (IRB) or Ethics Committee (EC)
Key exclusion criteria (20 listed)
- Pregnant or nursing
- Any myocardial infarction at index presentation or within 90 days prior to enrollment, defined as any electrocardiogram diagnostic for myocardial infarction OR elevation in serum troponin greater than the upper limit of the site-defined reference range
- Known left ventricular ejection fraction < 50% or cardiogenic shock requiring pressors or mechanical circulatory assistance (e.g., intra-aortic balloon pump, left ventricular assist device, other temporary cardiac support blood pump)
- Renal insufficiency, defined as estimated glomerular filtration rate (eGFR) <30 mL/min/1.73 m2 (by the Modification of Diet in Renal Disease equation) or dialysis at the time of screening
- Prior percutaneous coronary intervention
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Coroventis Coroflow Cardiovascular System and PressureWire™ X GuidewireAlso: Acetylcholine ProvocationPatients presenting with symptomatic ischemic heart disease (including chronic stable angina or unstable angina) without evidence of myocardial infarction who require elective or urgent cardiac catheterization, and who meet all eligibility criteria will be enrolled. Participants will undergo routine coronary angiography as well as comprehensive physiologic assessment with intracoronary acetylcholine provocation for diagnosis of vasospastic angina (VSA), coronary thermodilution to evaluate for coronary microvascular dysfunction (CMD), and intracoronary imaging with optical coherence tomography (OCT) or intravascular ultrasound (IVUS) to evaluate for the presence of atheroma, plaque burden, and myocardial bridging. | Diagnostic test | – |
Primary outcome
The proportion of subjects with each physiologic phenotypes diagnosed with the Coroflow Cardiovascular System will be reported within 24-48 hours of the procedure.
Time frame: up to 48 hours after the procedure
The following phenotypes will be captured: Coronary microvascular dysfunction (CMD)- Criteria for a diagnosis of CMD include an abnormal Index of Microcirculatory Resistance (IMR) ≥ 25 and/or impaired Coronary Flow Reserve (CFR) ≤ 2.0; Vasospastic angina (VSA): Includes coronary vasospasm, microvascular spasm, and endothelial dysfunction. Criteria for coronary vasospasm include ≥ 90% narrowing of the epicardial vessel during acetylcholine testing and either or both angina and transient ischemic EKG changes. Microvascular spasm includes angina and/or ischemic EKG changes in the absence of spasm of the epicardial vessel during acetycholine infusion; Endothelial dysfunction as defined as angiographic diameter change less than or equal to 0% and but not greater than -89% in response to acetylcholine infusion; Mixed CMD/VSA; Any other disorders of coronary physiology.
The proportion of subjects that experience Major Adverse Cardiovascular Events (MACE)
Time frame: Up to 5 years
The proportion of subjects that experience Major Adverse Cardiovascular Events (MACE) as reported by the clinical study sites and adjudicated by the Clinical Events Committee (CEC). Reports may come from the clinical site or self report. MACE defined as a composite of cardiovascular death, myocardial infarction, hospitalization for cardiovascular causes or coronary revascularization.
The proportion of subjects that exhibit mild, moderate or severe coronary artery stenosis
Time frame: At the time of the procedure
The proportion of subjects that exhibit mild, moderate or severe coronary artery stenosis as measured by Optical Coherence Tomography (OCT), Intravascular Ultrasound (IVUS) or Quantitative Coronary Angiography (QCA). Mild stenosis is defined as less than or equal to 30%, Moderate stenosis is defined as 31%-69%, and severe stenosis is greater than or equal to 70%. The measurements will take place during the procedure and the analysis will be completed by a central core lab.
Lesion length during the procedure
Time frame: At the time of the procedure
Lesion length during the procedure will be determined for each subject by the use of OCT, IVUS or QCA and the analysis will be completed by a central core lab. Lesion length will be defined by either less than 15mm or equal to or greater than 15mm.
17 secondary outcomes
The proportion of subjects that experience Major Adverse Cardiovascular and Cerebrovascular Events (MACCE) at any time during the study.
Time frame: Up to 5 Years
The proportion of subjects that die at any time in the study
Time frame: Up to 5 years
The proportion of subjects that experience a Myocardial Infarction (MI) at any time during the study.
Time frame: Up to 5 Years
The proportion of subjects that experience a stroke at any time during the study.
Time frame: Up to 5 years
The proportion of subjects that require revascularization of their coronary arteries at any time during the study.
Time frame: Up to 5 years
The proportion of subjects that experience a hospitalization at any time during the study.
Time frame: Up to 5 years
The proportion of subjects that require repeat coronary angiography at any time during the study.
Time frame: Up to 5 years
The proportion of subjects with coronary lesions that experience progression to obstructive Coronary Artery Disease (CAD) at any time during the study.
Time frame: Up to 5 years
Proportion of subjects that experience major bleeding at any time during the study using the Bleeding Academic Research Consortium (BARC) bleeding type
Time frame: Up to 5 years
Proportion of subjects that experience Major Vascular Complications at any time during the study.
Time frame: Up to five 5 years
Proportion of subjects that experience a composite of death, stroke, and MI at any time during the study.
Time frame: Up to 5 years
Change from baseline in proportion of subjects that experience each classification of angina status during the study.
Time frame: At baseline, 30 days, 6 months, 1 year, 2 years, 3 years, 4 years, and 5 years
The change in baseline of angina symptoms for each subject. The angina status will be classified at the time of the procedure, at 30 days, 6 months, 12months and then annually up to 5 years.
Time frame: At baseline, 30 days, 6 months, 1 year, 2 years, 3 years, 4 years, and 5 years
The change in the quality of life (QOL) from baseline for each subject will be assessed using the QOL EQ-5D-5L questionnaire.
Time frame: At baseline, 30 days, 6 months, 1 year, 2 years, 3 years, 4 years, and 5 years
The change in depression status from baseline for each subject assessed by the Patient Health Questionnaire (PHQ)-8 questionnaire.
Time frame: At baseline, 30 days, 6 months, 1 year, 2 years, 3 years, 4 years, and 5 years
The change in anxiety status from baseline for each subject. will be assessed by the Generalized Anxiety Disorder (GAD)-7 questionnaire.
Time frame: At baseline, 30 days, 6 months, 1 year, 2 years, 3 years, 4 years, and 5 years
The proportion of subjects that experience a series of procedural outcomes as assessed by the site and adjudicated by the CEC.
Time frame: Up to 48 hours after the procedure
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 23 Oct 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Samit Shah, MD, PhD principal investigator
Yale University Medical School
Alexandra Lansky, MD principal investigator
Yale University Medical School
9 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Ischemia and No Obstructive Coronary Artery Disease and Coronary Microvascular Dysfunction, run by Yale University at 9 sites in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 20 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: under way, not looking for participants, as of the sponsor's last update on 23 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 9 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
The proportion of subjects with each physiologic phenotypes diagnosed with the Coroflow Cardiovascular System will be reported within 24-48 hours of the procedure. (time frame: up to 48 hours after the procedure). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 23 Oct 2026.