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Updated: May 3, 2026
Transcutaneous Microcirculatory Imaging in Preterm Neonates
Published on: December 31, 2015
Evaluation of cardiac muscle microvessel density in children diagnosed with cyanotic heart defects
Paulina Jankowska, Agnieszka Malinska, Michal Nowicki1
1Departments of Histology and Embryology, University of Medical Sciences in Poznan, Poland. mnowicki@ump.edu.pl.
Insights
Congenital cyanotic heart defects in children may stimulate new blood vessel growth (angiogenesis) in the heart
Area of Science:
- Cardiovascular Research
- Pediatric Cardiology
- Vascular Biology
Background:
- Angiogenesis, the formation of new blood vessels, is a response to tissue hypoxia.
- The impact of hypoxia-induced angiogenesis on cardiac muscle in children with congenital cyanotic heart defects is not well understood.
- Congenital heart defects can lead to chronic hypoxia, potentially affecting cardiac angiogenesis.
Purpose of the Study:
- To compare cardiac muscle microvessel density (MVD) between children with cyanotic and non-cyanotic heart defects.
- To assess the prognostic value of MVD in predicting postoperative ventricular dysfunction.
- To investigate the role of angiogenesis in the context of congenital heart disease.
Main Methods:
- Tissue samples from the cardiac muscle of pediatric patients undergoing surgical correction were analyzed.
- Immunocytochemistry using CD31, CD34, and CD105 antibodies was performed to quantify MVD.
- Patients were divided into cyanotic (study group, n=42) and non-cyanotic (control group, n=33) heart defect groups.
Main Results:
- Overall MVD in cardiac muscle did not significantly differ between cyanotic and non-cyanotic groups (CD34 expression).
- However, the subendocardial meshwork showed significantly higher MVD in cyanotic patients (92.8 ± 10.9/mm²) compared to non-cyanotic patients (75.3 ± 7.0/mm²).
- No significant correlation was found between MVD and the development of postoperative ventricular dysfunction.
Conclusions:
- Congenital cyanotic heart defects may induce angiogenesis specifically in the subendocardial meshwork, likely during fetal development.
- This angiogenic response appears independent of the specific type of cyanotic heart disease.
- MVD measurement is not a reliable predictor of postoperative ventricular dysfunction in these pediatric patients.
Abstract:
Angiogenesis is largely an adaptive response to tissue hypoxia, which occurs in a wide variety of situations. Interestingly, the extent of hypoxia-induces angiogenesis in the cardiac muscle of children diagnosed with congenital cyanotic heart defects is not well established. Thus, the aim of this study was to 1) estimate the cardiac muscle microvessel density (MVD) in children diagnosed with cyanotic (study group) and non-cyanotic (control group) heart defects and to 2) evaluate the prognostic significance of MVD value in the development of ventricular dysfunction in the postoperative period. The study group included 42 children diagnosed with cyanotic heart defects. The control group comprised 33 patients with a diagnosis of non-cyanotic heart failure. The collected tissue included cardiac muscle sections from the right atrium and interventricular or interatrial wall during surgical correction of the defect. Immunocytochemistry with monoclonal mouse anti-human antibodies against CD31, CD34 and CD105 was employed to estimate the MVD value. The mean cardiac muscle MVD, defined by CD34 expression, was 596.7 ± 32.6 microvessels per 1 mm² in the study group, which was notsignificantly different from the mean MVD in the control group (461.2 ± 30.5). Interestingly, in non-cyanotic heart defects, an inner area of subendocardial meshwork was estimated to have 75.3 ± 7.0 microvessels per 1 mm², compared to 92.8 ± 10.9 microvessels per 1 mm² (p = 0.0082) in patients with cyanotic heart defects. No significant correlations between MVD value and ventricular dysfunction were found. Cyanotic heart defects resulting in chronic hypoxia might provoke angiogenesis in the subendocardial meshwork of the heart wall. The process seems to be independent of the type of cyanotic heart disease and most likely takes place during antenatal development. A ventricular dysfunction observed in some cases of cyanotic heart defects could not be predicted by the estimation of MVD.
