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Updated: May 16, 2026

Intravascular Ultrasound Image-Based Finite Element Modeling Approach for Quantifying In Vivo Mechanical Properties of Human Coronary Artery
Published on: December 6, 2024
Pressure-diameter relationship in human coronary arteries
Olivier Muller1, Stylianos A Pyxaras, Catalina Trana
1Cardiovascular Centre Aalst, OLV-Clinic, Belgium.
Coronary artery diameter significantly increases after percutaneous coronary intervention (PCI) due to restored pressure. This finding is crucial for selecting appropriate stent sizes and suggests caution with direct stenting.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Vascular Biology
Background:
- Percutaneous coronary intervention (PCI) involves acute pressure changes in coronary arteries.
- Understanding arterial dimension responses to pressure is vital for procedural success.
Purpose of the Study:
- To quantify changes in coronary arterial dimensions following acute pressure shifts during PCI.
- To assess the relationship between pressure changes and arterial diameter post-PCI.
Main Methods:
- Measurements of proximal and distal coronary pressure and diameter were taken at baseline, post-nitrates, and post-stent PCI in 48 patients.
- In 8 patients, graded stenoses were created to evaluate pressure-diameter relationships.
Main Results:
- Coronary artery diameter increased significantly both proximally (14.7%) and distally (28.4%) after PCI (P<0.001).
- The increase in distal diameter strongly correlated with the rise in distal pressure post-PCI (r²=0.57; P<0.001).
- Created stenoses showed an 18% diameter reduction with a 43 mm Hg pressure drop.
Conclusions:
- Coronary artery diameter is highly sensitive to distending pressure.
- Stenting severe stenoses restores normal pressure, leading to a proportional increase in vessel diameter.
- These findings impact stent sizing decisions and argue against routine direct stenting.
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