vitamin a. xerophthalmia vernacular terms matang manok mata ajam khwak moan gred gradei mager aagh...
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Vitamin A
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Xerophthalmia Vernacular TermsXerophthalmia Vernacular Terms
Matang Manok Mata Ajam Khwak Moan Gred Gradei Mager Aagh Korapothu
Chicken Eyes Chicken Eyes Dusk Blindness Scaly as Fish Fish Scales Scaly
Tagalog Indonesian Khmer Thai Bengali Singhalese
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Impact of VADD on Public HealthImpact of VADD on Public Health
• 250 million preschool-age children have subclinical vitamin A deficient
•7.2 million pregnant women
• 3 million have clinical xerophthalmia
• 300, 000 are blind from xerophthalmia
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Impact of Vitamin A Intervention on Impact of Vitamin A Intervention on Child SurvivalChild Survival
“Improvement of vitamin A status in young child populations… leads to a reduction in all-cause mortality rates of about 23%.”
United Nations, 1993
“Improved vitamin A nutriture would be expected to prevent approximately 1.3-2.5 million deaths annually among children aged under 5 years.”
Bulletin of WHO, 1992
BUT Mechanisms involved are poorly understood
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FunctionsFunctions
• Vision (night, day, colour)
• Epithelial cell integrity against infections
• Immune response
• Haemopoiesis
• Skeletal growth
• Fertility (male and female)
• Embryogenesis
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Tests of Vitamin A StatusTests of Vitamin A Status
Subclinical
• Relative dose-response test
• Serum retinol
• Retinal rod function
• Conjunctival impression cytology (CIC)
Clinical
• Night blindness
• Conjunctival and corneal eye signs
Decreased Status
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• Liver disease deacreases plasma retinal levels, probably as a result of a combination of decreased synthesis and secretion of RBP.
• Stress decreases plasma retinol levels.
• Protein-energy malnutrition decreases RBP production because of a limited supply of protein substrate. Consequently hepatic release of vitamin A is impaired resulting in decreased serum retinol levels.
• Zinc deficiency decreases plasma retinol levels via its role in the synthesis of RBP.
Factors that may Affect Plasma Factors that may Affect Plasma Vitamin A or Retinol LevelsVitamin A or Retinol Levels
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• Infections and parasitic infections lower plasma retinol levels.
• Cystic fibrosis is associated with a defect in the transport of vitamin A from the hepatic stores to the periphery resulting in decreased levels of circulating retinol and RBP.
• Low fat diets impair absorption of vitamin A, lowering plasma retinol concentrations.
• Estrogens, either endogenous or those used in contraceptive agents, increase plasma retinol and RBP apparently as a result of incresed mobilization of Vitamin A from the liver.
• Age, sex and race influence serum retinol levels, as indicated by the NHANES II survey results.
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For the test, a baseline blood sample is taken immediately before the administration of a small oral dose (450µg) of
vitamin A (as retinyl acetate or retinol palmitate); followed by a second blood sample, five hours later. The RDR (%) is
calculated as:
RDR(%) =Plasma retinol at 5 hr – Plasma retinol at 0hr
Plasma retinol at 5 hrX 100
Vitamin-A-replete subjects have RDR values ranging from 0% to 14%. Relative dose response values greater than 14%
to 20% are indicative of marginal vitamin A status in humans, the cutoff value depending on the coefficient of
variation for the analytical method used to measure serum
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<20
21 - 29
30 - 40
>40
100
86
26
3
12
21
19
39
Serum Retinol (µg/dL) % Number Tested
Total tested 91
Percentage of Children with Positive Percentage of Children with Positive RDR Test Classified by Serum Retinol RDR Test Classified by Serum Retinol
LevelsLevels
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Treatment Schedule (orally)Treatment Schedule (orally)
Immediately on diagnosis:
50, 000 IU<6 months
100, 000 IU6 months-12 months
200, 000 IU> 12 months
Next day Same age-specific dose
At least two weeks later Same age-specific dose
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Xerophthalmia ClassificationXerophthalmia Classification
XN
X1A
X1B
X2
X3A
X3B
Night Blindness
Conjunctival Xerosis
Bitot’s Spot with Conjunctival Xerosis
Corneal Xerosis
Corneal Xerosis with ulceration
Keratomalcia
XF Xerophthalmic Fundus
XS Corneal scars from Xerophthalmia
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WHO criteria of a public health WHO criteria of a public health problem of xerophthalmiaproblem of xerophthalmia
• Night Blindness (XN) In > 1%
• Bitots spot (X1B) In > 0.5%
(X2, X3A, X3B) In >0.01%
• Corneal Xerosis/Ulceration/Keratomalacia
• Corneal scar (XS) In > 0.05%
• Plasma retinol of <0.35µmol/l (10 µg/dl)
In > 5%
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Percent with Serum Vitamin A:
Children with night-blindness or Bitot’s spots
Normal Children
Children with corneal xerophthalmia
<10 µg/dL 10-19 µg/dL >20 µg/dLn
252
325
98
8
75
30
37
24
15
55
1
55
Serum vitamin A levels in a sample of Indonesian children with and without ocular lesions. Conversion factor SI units(µmol/L)=
x 0.035