Understanding the pathogenesis of coronary slow flow: Recent advances
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Updated: Aug 17, 2025

Ultrasound Based Assessment of Coronary Artery Flow and Coronary Flow Reserve Using the Pressure Overload Model in Mice
Published on: April 13, 2015
Qing Zhu1, Shitong Wang1, Xin Huang2
1Department of Cardiovascular Ultrasound, The First Hospital of China Medical University, Shenyang, China; Clinical Medical Research Center of Imaging in Liaoning Province, Shenyang, China.
Insights
Coronary slow flow, a condition causing chest pain due to delayed coronary artery filling without stenosis, requires further research into its causes. Understanding the pathogenesis of coronary slow flow is key to developing effective treatments.
Area of Science:
- Cardiology
- Vascular Medicine
- Pathophysiology
Background:
- Coronary slow flow (CSF) is characterized by delayed contrast agent transit in coronary arteries without significant stenosis.
- CSF significantly impacts patient quality of life due to recurrent chest pain.
- The underlying causes and mechanisms of CSF remain incompletely understood.
Purpose of the Study:
- To review recent research on the pathogenesis of coronary slow flow.
- To elucidate potential underlying mechanisms contributing to CSF.
- To identify therapeutic targets and future research directions for CSF.
Main Methods:
- Literature review of recent studies on coronary slow flow.
- Analysis of proposed etiological and pathogenetic factors.
- Synthesis of current understanding regarding CSF mechanisms.
Main Results:
- Current evidence suggests CSF may involve endothelial dysfunction, inflammation, microvascular abnormalities, subclinical atherosclerosis, hematological factors, and genetic predispositions.
- No single cause is definitively established, indicating a multifactorial etiology.
- Research is evolving to better understand the complex interplay of these factors.
Conclusions:
- Further investigation into the multifactorial pathogenesis of coronary slow flow is crucial.
- Elucidating these mechanisms will guide the development of targeted therapies.
- Future research should focus on identifying specific pathways for effective CSF management.
Abstract:
Coronary slow flow is taken to be indicative of delayed filling of terminal vessels of the coronary arteries in the absence of coronary stenosis, as detected using coronary angiography. Patients suffering from coronary slow flow typically experience recurrent chest pain, thereby markedly affecting their quality of life. The etiology and pathogenesis of coronary slow flow, which is gradually attracting clinical attention, have yet to be sufficiently established, although it is currently believed that they may be associated with endothelial dysfunction in the coronary arteries, inflammatory response, abnormalities in microvascular reserve function, subclinical atherosclerosis, blood cell and platelet abnormalities, and genetic factors. In this review, we provide a brief overview of recent progress in research on the pathogenesis of coronary slow flow with a view toward elucidating the possible underlying pathogenesis and identify targets and directions for the treatment of this condition.
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