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Structural abnormalities of great arterial walls in congenital heart disease: light and electron microscopic analyses
K Niwa1, J K Perloff, S M Bhuta
1Ahmanson/UCLA Adult Congenital Heart Disease Center, University of California, Los Angeles, USA.
Insights
Medial abnormalities in great arteries are common in congenital heart disease (CHD), potentially leading to dangerous dilations and ruptures. Further research is needed to understand their cause and implications.
Area of Science:
- Cardiovascular Pathology
- Congenital Heart Disease Research
- Arterial Wall Biology
Background:
- Great arteries in congenital heart disease (CHD) are prone to dilation, aneurysm formation, and rupture.
- The underlying medial abnormalities in these arterial walls remain poorly understood.
- This study investigates medial abnormalities across 18 types of CHD in patients of all ages.
Purpose of the Study:
- To characterize medial abnormalities in the ascending aorta, paracoarctation aorta, truncus arteriosus, and pulmonary trunk in patients with congenital heart disease.
- To establish a grading system for medial abnormalities based on light and electron microscopy.
- To explore potential links between these abnormalities and clinical outcomes like arterial dilation and rupture.
Main Methods:
- Analysis of intraoperative biopsies and necropsy specimens from 102 patients with various forms of CHD.
- Examination of specimens using light microscopy (LM) and electron microscopy (EM).
- Comparison with control groups including Marfan syndrome patients and individuals with acquired aortic valve disease.
Main Results:
- Medial abnormalities were prevalent in the ascending aorta, paracoarctation aorta, truncus arteriosus, and pulmonary trunk across a wide age range of CHD patients.
- A grading system was developed based on LM and EM findings to quantify the severity of medial abnormalities.
- The study identified specific arterial segments affected by these abnormalities in different CHD types.
Conclusions:
- Medial abnormalities are a common feature in diverse forms of congenital heart disease.
- These abnormalities may predispose affected arteries to dilation, aneurysm formation, and rupture.
- Key questions remain regarding the inherent versus acquired nature of these abnormalities, the role of CHD, and potential genetic factors.
Background:
Great arteries in congenital heart disease (CHD) may dilate, become aneurysmal, or rupture. Little is known about medial abnormalities in these arterial walls. Accordingly, we studied 18 types of CHD in patients from neonates to older adults.
Methods And Results:
Intraoperative biopsies from ascending aorta, paracoarctation aorta, truncus arteriosus, and pulmonary trunk in 86 patients were supplemented by 16 necropsy specimens. The 102 patients were 3 weeks to 81 years old (average, 32+/-6 years). Biopsies were examined by light (LM) and electron (EM) microscopy; necropsy specimens by LM. Positive aortic controls were from 15 Marfan patients. Negative aortic controls were from 11 coronary artery disease patients and 1 transplant donor. Nine biopsies from acquired trileaflet aortic stenosis were compared with biopsies from bicuspid aortic stenosis. Negative pulmonary trunk controls were from 7 coronary artery disease patients. A grading system consisted of negative controls and grades 1, 2, and 3 (positive controls) based on LM and EM examination of medial constituents.
Conclusions:
Medial abnormalities in ascending aorta, paracoarctation aorta, truncus arteriosus, and pulmonary trunk were prevalent in patients with a variety of forms of CHD encompassing a wide age range. Aortic abnormalities may predispose to dilatation, aneurysm, and rupture. Pulmonary trunk abnormalities may predispose to dilatation and aneurysm; hypertensive aneurysms may rupture. Pivotal questions are whether these abnormalities are inherent or acquired, whether CHD plays a causal or facilitating role, and whether genetic determinants are operative.
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