Related Experiment Video
Updated: Aug 14, 2026
Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
Published on: April 13, 2015
Coronary microvascular disease in humans
1Research Institute of Angiocardiology and Cardiovascular Clinic, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
Insights
Coronary microvascular dysfunction causes myocardial perfusion abnormalities, even without epicardial coronary artery disease. Impaired nitric oxide availability may underlie this condition, offering a potential therapeutic target.
Area of Science:
- Cardiology
- Vascular Biology
- Physiology
Background:
- Myocardial perfusion abnormalities can occur without significant epicardial coronary artery disease.
- Conditions like microvascular angina, hypertension, and left ventricular hypertrophy are associated with these abnormalities.
- Endothelial dysfunction is implicated in microvascular dysfunction, but its exact mechanisms remain unclear.
Purpose of the Study:
- To explore the mechanisms underlying myocardial perfusion abnormalities in the absence of epicardial coronary artery disease.
- To investigate the role of endothelial dysfunction and nitric oxide in coronary microvascular derangements.
- To identify potential therapeutic strategies for patients with coronary microvascular dysfunction.
Main Methods:
- Review of existing literature on myocardial perfusion, coronary microcirculation, and endothelial function.
- Analysis of studies investigating cardiovascular disorders associated with microvascular abnormalities.
- Examination of the role of nitric oxide in regulating vascular tone and coronary blood flow.
Main Results:
- Patients exhibit limited coronary microvascular dilator reserve, sometimes with evidence of myocardial ischemia.
- Primary microvascular hyperconstriction (spasm) may cause ischemia in some patients with rest angina.
- Decreased nitric oxide availability is a potential factor in endothelial dysfunction and microvascular derangements.
Conclusions:
- Coronary microvascular dysfunction is a significant contributor to myocardial perfusion abnormalities in various cardiovascular diseases.
- Endothelial dysfunction, potentially involving reduced nitric oxide, plays a key role in these microvascular derangements.
- Targeting nitric oxide pathways presents a promising therapeutic avenue for managing coronary microvascular dysfunction.
Abstract:
Myocardial perfusion abnormalities occur in the absence of epicardial coronary artery disease in patients with a wide spectrum of cardiovascular disorders including microvascular angina, hypertension and left ventricular hypertrophy, coronary atherosclerosis, hypercholesterolemia, and non-ischemic left ventricular dysfunction. These patients have limited coronary microvascular dilator reserve which occasionally is associated with evidence of myocardial ischemia. Primary microvascular hyperconstriction (spasm) is also proposed to cause myocardial ischemia in a subset of patients with rest angina. There is ample evidence suggesting that endothelial dysfunction contributes to microvascular dysfunction, but the precise mechanism of endothelial dysfunction is not known. Nitric oxide is one of the key molecules which control microvascular tone and therefore coronary blood flow, and its decreased availability appears to be involved under certain conditions. This hypothesis has attracted considerable interest as a new therapeutic strategy for these patients having coronary microvascular derangements caused by divergent cardiovascular diseases.
Related Concept Videos
01:30Coronary Artery Disease I: Introduction
01:26Coronary Artery Disease II: Pathophysiology