Impact of Hyperemic State on Angio-IMR Performance
Recruiting now
Conditions studied: Coronary Artery Disease, Microvascular Coronary Artery Disease
In brief
The goal of this observational study is to evaluate the diagnostic performance of angiography-derived microcirculatory indices (Angio-IMR) in assessing patients with stable angina or suspected coronary artery disease. The main questions it aims to answer are: How do the numerical values of Angio-IMR from five different software vendors change across three physiological states (resting, sub-hyperemia induced by nitroglycerin, and maximal hyperemia induced by adenosine)? Which physiological state and software algorithm provide the highest diagnostic accuracy (Area Under the Curve, AUC) for diagnosing Coronary Microvascular Disease (CMD) when compared to the gold standard wire-based IMR? Researchers will compare the Angio-IMR results calculated under the three different physiological conditions within the same patient to see how the hyperemic state impacts the performance and consistency of these non-invasive indices. Participants will: Undergo standard-of-care coronary angiography and physiological assessment using a pressure wire for index of microvascular resistance (Wire-IMR) as part of their clinical management. Have their angiographic images captured at three specific time points: at rest, after intracoronary nitroglycerin, and during adenosine-induced maximal hyperemia. Allow their de-identified imaging and clinical data to be analyzed by an independent core laboratory using five different Angio-IMR software platforms to evaluate microvascular function.
Key facts
- Study ID
- NCT07613996
- Run by
- Shanghai Zhongshan Hospital
- People needed
- 192
- Starts
- 2026-05-04
- Expected to finish
- 2026-12-31
- Last updated by the study team
- 2026-05-29
Who can join
Age: 18 and older. Sex: any. Healthy volunteers: not accepted.
You may qualify if…
- Stable angina or suspected coronary heart disease.
- Scheduled for coronary angiography and physiological assessment.
- Target vessel with stenosis < 50% or 50%-90% with fractional flow reserve (FFR) > 0.80.
- Provided informed consent.
You may not qualify if…
- Hemodynamic instability (acute myocardial infarction, cardiogenic shock, severe arrhythmia).
- Contraindications to angiography (e.g., end-stage renal disease).
- Contraindications to adenosine (e.g., severe asthma, high-degree atrial-ventricular block).
- Life expectancy < 1 year or pregnancy.
- Target vessel unsuitable for wire operation (left main lesion, severe tortuosity) or stenosis > 90%.
Where it is running
- Zhongshan Hospital, Fudan University — Shanghai, Please Select, China (enrolling)
- The First Affiliated Hospital, Sun Yat-sen University — Guangzhou, China (enrolling)
Full record on ClinicalTrials.gov
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