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[Electron probe x-ray microanalysis of human aorta with isthmus stenosis]
Insights
High blood pressure rapidly enriches calcium and phosphorus in the aorta, promoting vessel wall mineralization. This study analyzed element content in coarctation patients, revealing pathological alterations in the aorta.
Area of Science:
- Cardiovascular Research
- Biomedical Engineering
- Pathology
Context:
- Aortic coarctation provides a unique model to study blood pressure-dependent vascular changes.
- Comparing proximal (high pressure) and distal (low pressure) aortic regions offers insights into hypertension effects.
- Vascular calcification is a significant pathological process in cardiovascular disease.
Purpose:
- To investigate the elemental composition, specifically calcium (Ca) and phosphorus (P), in the aortic wall of patients with isthmus stenosis.
- To quantitatively analyze the distribution and enrichment of Ca and P in relation to blood pressure gradients within the aorta.
- To elucidate the early pathological alterations in the vessel wall due to elevated blood pressure.
Summary:
- Electron probe microanalysis was used to determine Na, Mg, P, S, Cl, K, and Ca content in aortic vessel walls from 5 patients (2 months to 34 years).
- Measurements focused on Ca and P, key minerals in vascular calcification, analyzing concentrations from lumen to outer media.
- Results show Ca and P enrichment in a subintimal band up to age 18, and throughout the media in a 34-year-old patient, with higher proximal concentrations.
Impact:
- High blood pressure rapidly induces Ca and P enrichment in a subintimal band, initiating vessel wall mineralization.
- Electron probe microanalysis provides quantitative evidence of these pathological alterations in the aorta.
- Findings contribute to understanding the early mechanisms of vascular disease progression related to hypertension.
Abstract:
Aortas with isthmus stenosis (coarctation) can be regarded as a model for those changes of the vessel wall, that depend on blood pressure, as one can compare the proximal region (high pressure) with the distal one (low pressure). The Na, Mg, P, S, Cl, K, and Ca content of the vessel walls of 5 patients (age: 2 months to 34 years) were determined by electron probe microanalysis. We have used cryostat sections and measured the element concentrations from the lumen to the outer media. In this paper we discuss especially the measurements of Ca and P, as the mineral being deposited in the vessel wall, e.g. in arteriosclerosis, contains Ca and P. Up to 18 years Ca and P enrichments are found only in a subintimal band parallel to the lumen. The proximal region of the aorta of a 34 years old patient, however, demonstrated Ca and P enrichments in the whole media with a high peak in the subintimal band. The enrichments are proximally always higher than distally. Only in the distal region of the 2 months old infant no Ca or P enrichments were found, but they appeared proximally. Thus high blood pressure causes an enrichment of Ca and P in a subintimal band very rapidly and promotes the mineralization of the vessel wall. The quantitative electron probe microanalysis demonstrated these pathological alterations.