Objectives: To study the cytogenetic patterns, congenital heart disease, and thyroid dysfunction in children with Down syndrome.
Study Design: This was a retrospective observational study of children with Down syndrome over a period of 20 years, from a major referral institution in Kerala state, South India. The cytogenetic patterns, echocardiography reports, and thyroid profiles were analyzed using SPSS, version 20, software. The prevalence of heart disease and thyroid status in the various cytogenetic patterns also were analyzed.
Results: The prevalence of translocation (9.45%) was high compared with the reported 4% in the literature. More of the younger mothers had translocation with a greater, but not statically significant, incidence of heart disease. Mosaic karotypes (3.04%) were also greater than reported (1%) in the literature, with female preponderance. Heart disease was seen in 58% of cases, with atrial septal defect being the most common lesion, compared with atrioventricular septal defect noted in literature. Hypothyroidism was noted in 31.2% with no difference among the cytogenetic groups. There was no case of hyperthyroidism.
Conclusions: The high prevalence of translocation and mosaic Down syndrome stresses the need for routine karyotyping in children with Down syndrome. The need for routine screening and regular follow up of heart diseases and thyroid status should be emphasized.
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