Down's Syndrome
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Transcript of Down's Syndrome
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Down's Syndrome
Dr Katie BennerVTS 1 in paediatrics
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Definition
In 1887 Landon-Down described a syndrome of physical anomalies and mental handicap
Was previously known as “Mongolism”, now known as Down's syndrome or trisomy 21
Commonest of the chromosomal disorders and major cause of mental retardation
Incidence increases with maternal age
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Clinical Features
Brachcephaly
maximal breadth of the skull in the coronal plain is more than 80% of the length in the sagittal plain
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Short neck Epicanthic folds
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Inward down - mongoloid - slant to the eyes Brushfield spots on the iris
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almond shaped eyes small simple ears, which may be low set flat nasal bridge
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protruding tongue, mouth hanging open narrow high arched palate
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Associations
duodenal atresia (10%) Hirschsprung's disease (3%) other intestinal atresias Up to 40% have congenital heart disease: atrioventricular canal - the most common ventricular septal defect patent ductus arteriosus atrial septal defect - ostium primum (40%) tetralogy of Fallot
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Management
Support for family Referral to MDT Referral to relevant specialists if complications
arise
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Prognosis
90% live to 5 years Remainder die of congenital heart disease,
Hirschprung's and infection
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Antenatal issues
All pregnant women should be offered screening (but it is their choice to decline)
From 10+0 to 20+0 weeks 2 different tests depending on when woman
presents If up to 14+1 gets triple test hCG, PAPP-A and
nuchal translucency If 14+2 to 20+0 gets hCG, AFP, uE3, inhibin A
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Maternal risk
Woman's age (years)
Risk as a ratio%RiskBelow 20 1:16000.06720 1:15000.06630 1:800 0.12535 1:270 0.3740 1:100 1.045 and over 1.50 and greater 2.0