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Biomechanical and structural assessment of transluminal angioplasty
1Latvian Neuroangiological Centre, Riga 7th Clinical Hospital, Latvia.
Insights
Percutaneous transluminal angioplasty (PTA) can alter arterial biomechanics. This study assessed PTA
Area of Science:
- Biomedical Engineering
- Vascular Surgery
- Cardiovascular Research
Background:
- Stroke incidence is linked to narrowed precerebral and cerebral arteries.
- Percutaneous transluminal angioplasty (PTA) is a common treatment for cerebrovascular disorders.
- The biomechanical effects of PTA on arterial walls remain largely unassessed.
Purpose of the Study:
- To evaluate the influence of experimental transluminal angioplasty on the biomechanical properties of major cerebral arteries.
- To determine changes in arterial wall elasticity and diameter post-angioplasty.
Main Methods:
- Cylindrical arterial segments (internal carotid, middle cerebral, anterior cerebral, vertebral, basilar, posterior cerebral arteries) were obtained from 40 autopsy subjects.
- Experimental transluminal angioplasty was performed on arterial segments using specialized equipment.
- Biomechanical properties were assessed using TV camera-assisted measurements, morphometric, and histological methods before and after angioplasty.
Main Results:
- Transluminal angioplasty resulted in increased relative strain of the external vessel diameter.
- A decrease in the arterial wall's tangential elastic modulus in the circumferential direction was observed post-angioplasty.
- These changes indicate altered biomechanical properties of the arterial wall following the procedure.
Conclusions:
- Transluminal angioplasty can induce structural changes in the arterial wall, affecting its biomechanical properties.
- Sufficient structural damage from PTA may enhance the vessel's ability to dilate under normal blood pressure.
- Further research is needed to understand the long-term implications of these biomechanical alterations.
Abstract:
The increasing incidence of stroke is frequently maintained by the processes narrowing precerebral and cerebral arteries. That is why the surgical treatment of cerebrovascular disorders has increasingly included percutaneous transluminal angioplasty. However, the influence of transluminal angioplasty on the biomechanical properties of arterial wall have not been assessed so far. The cylindrical segments of left and right internal carotid artery, middle cerebral artery, anterior cerebral artery, vertebral artery, basilar artery and posterior cerebral artery were taken from 40 autopsy subjects aged from 20 to 75 who had no systemic lesions with the exception of atherosclerosis. The biomechanical examination and experimental transluminal angioplasty of the segments were carried out with special equipment developed for this purpose. The data were obtained using a TV camera assisted measurement and morphometric and histological methods. The examination of the biomechanical properties repeated after the experimental transluminal angioplasty shows the additional relative strain of the external diameter of vessel and the decrease of the arterial wall tangential elastic modulus in the circumferential direction. This suggests that if transluminal angioplasty results in sufficient structural damage of the arterial wall than there will be an improvement in the ability of the vessel diameter to increase under normal blood pressure conditions.