Vitamin A deficiency (Q39911): Difference between revisions
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A deficiência de vitamina A é definida como um estado no qual as concentrações de vitamina A nos tecidos são baixas o suficiente para que sejam observadas consequências adversas à saúde, mesmo que não haja evidência de xeroftalmia clínica. O termo xeroftalmia abrange o espectro clínico das manifestações oculares da deficiência de vitamina A, desde estágios mais leves de cegueira noturna e manchas de Bitot, até estágios de potencial cegueira como xerose, ulceração e necrose da córnea (ceratomalácia). Além dos sinais e sintomas específicos de xeroftalmia e do risco de cegueira irreversível, os sintomas inespecíficos incluem aumento da morbidade e mortalidade, saúde reprodutiva deficiente, aumento do risco de anemia e contribuições para desaceleração do crescimento e desenvolvimento. | |||
| description / en | description / en | ||
Vitamin A deficiency (VAD) is defined as a state in which tissue concentrations of vitamin A are low enough to have adverse health consequences even if there is no evidence of clinical xerophthalmia. The term xerophthalmia encompasses the clinical spectrum of ocular manifestations of vitamin A deficiency, from milder stages of night blindness and Bitot’s spots, to potentially blinding stages of corneal xerosis, ulceration and necrosis (keratomalacia). In addition to the specific signs and symptoms of xerophthalmia and the risk of irreversible blindness, nonspecific symptoms include increased morbidity and mortality, poor reproductive health, increased risk of anaemia, and contributions to slowed growth and development. | |||
Revision as of 05:30, 13 August 2026
Vitamin A deficiency (VAD) is defined as a state in which tissue concentrations of vitamin A are low enough to have adverse health consequences even if there is no evidence of clinical xerophthalmia. The term xerophthalmia encompasses the clinical spectrum of ocular manifestations of vitamin A deficiency, from milder stages of night blindness and Bitot’s spots, to potentially blinding stages of corneal xerosis, ulceration and necrosis (keratomalacia). In addition to the specific signs and symptoms of xerophthalmia and the risk of irreversible blindness, nonspecific symptoms include increased morbidity and mortality, poor reproductive health, increased risk of anaemia, and contributions to slowed growth and development.
| Language | Label | Description | Also known as |
|---|---|---|---|
| default for all languages | 5B55 |
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| English | Vitamin A deficiency |
Vitamin A deficiency (VAD) is defined as a state in which tissue concentrations of vitamin A are low enough to have adverse health consequences even if there is no evidence of clinical xerophthalmia. The term xerophthalmia encompasses the clinical spectrum of ocular manifestations of vitamin A deficiency, from milder stages of night blindness and Bitot’s spots, to potentially blinding stages of corneal xerosis, ulceration and necrosis (keratomalacia). In addition to the specific signs and symptoms of xerophthalmia and the risk of irreversible blindness, nonspecific symptoms include increased morbidity and mortality, poor reproductive health, increased risk of anaemia, and contributions to slowed growth and development. |
