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[Hemodynamic study of pulmonary vascular resistances in subjects with Down's syndrome with atrioventricular canal]
Insights
Children with Down syndrome and complete atrioventricular canal (CAV) have significantly higher pulmonary vascular resistances (PVR) than non-Down patients. This finding may be linked to primitive vascular anomalies in Down syndrome.
Area of Science:
- Cardiology
- Genetics
- Pediatrics
Context:
- Congenital heart disease (CHD) is common in Down syndrome.
- Complete atrioventricular canal (CAV) is the most frequent CHD in this population.
- Understanding hemodynamic differences is crucial for patient management.
Purpose:
- To compare hemodynamic data, specifically pulmonary vascular resistances (PVR), between Down syndrome patients and non-Down patients with CAV.
- To investigate potential causes for observed differences in PVR.
Summary:
- Cardiac catheterization was performed on 21 Down syndrome patients and 17 non-Down patients with CAV (ages 5-50 months).
- Mean PVR was significantly higher in Down syndrome patients (11.1 UM2) compared to non-Down patients (4.6 UM2).
- In subjects under 2 years, 35.7% of Down syndrome patients exhibited PVR >= 10 UM2, versus 0% in the non-Down group.
Impact:
- Findings suggest a potential link between primitive structural anomalies of the vascular bed in Down syndrome and elevated PVR.
- This research highlights critical hemodynamic distinctions in pediatric CAV patients with Down syndrome.
- Further investigation into the underlying causes of increased PVR in this population is warranted.
Abstract:
Down patients frequently present congenital heart disease (CHD). Among these the most common is complete atrioventricular canal (CAV). The Authors studied by cardiac catheterization 2 groups of subjects with CAV:21 Down-patients, aged 5-48 months (mean = 24.7) and 17 non-Down patients aged 6-50 months (mean = 23.1). Hemodynamic data were compared and in particular pulmonary vascular resistances (PVR) were analysed. Mean pulmonary resistance was 11.1 UM2 for Down children and 4.6 UM2 for non-Down children. Considering the subjects under 2 years of age, PVR greater than or equal to 10 UM2 was present in 5 of 14 (35.7%). Down children, while none in the non-Down group. The cause of this behaviour is unknown; some Authors, in pathological studies, found in Down-patients primitive structural anomalies of the vascular bed with decrease of total vascular surface area. This fact might explain higher values of PVR in Down-patients than in non-Down patients.