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> C > Carence en vitamine A
Carence en vitamine A
A nutritional condition produced by a deficiency of VITAMIN A in the diet, characterized by NIGHT BLINDNESS and other ocular manifestations such as dryness of the conjunctiva and later of the cornea (XEROPHTHALMIA). Vitamin A deficiency is a very common problem worldwide, particularly in developing countries as a consequence of famine or shortages of vitamin A-rich foods. In the United States it is found among the urban poor, the elderly, alcoholics, and patients with malabsorption. (From Cecil Textbook of Medicine, 19th ed, p1179)
Synonyme(s)
Carence en rétinol; Déficit en vitamine ARelation(s)
- voir aussi au terme générique : [Descripteurs (mots clés)] Avitaminoses
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Case Report: Nyctalopia Due to Severe Liver Cirrhosis–induced Vitamin A Deficiency / Shuyi Chen in OVS : Optometry & Vision Science, vol. 100, 02 (Février 2023)
[article]
in OVS : Optometry & Vision Science > vol. 100, 02 (Février 2023)
Titre : Case Report: Nyctalopia Due to Severe Liver Cirrhosis–induced Vitamin A Deficiency Type de document : article de périodique Auteurs : Shuyi Chen ; Amy Jill Quan Année de publication : 2023 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Carence en vitamine A
[Thésaurus Mesh]Cirrhose du foie
[Thésaurus Mesh]Rhodopsine
[Thésaurus Mesh]Troubles de la visionRésumé : SIGNIFICANCE: Vitamin A is a micronutrient critical for retinal function. Patients with a deficiency may notice a progressive decline in night vision as rod photoreceptors become unable to regenerate rhodopsin. Although uncommon in developed nations, vitamin A deficiency should be considered in symptomatic patients with chronic, severe liver disease. PURPOSE: This report presents a rare case of night blindness secondary to poor vitamin A metabolism due to severe liver cirrhosis. CASE REPORT: A 62-year-old White woman presented with progressively worsening vision in dim lighting over the past 6 to 8 months. She was asymptomatic in daylight but “blind in the dark” to the extent that she was afraid to go outside at night. She had no personal or family history of night blindness or retinal disorders. Ocular health was unremarkable with dilation. Given her medical history of severe nonalcoholic liver cirrhosis, malabsorption of vitamin A was suspected and subsequently confirmed by the very low vitamin A level in her serum analysis. The patient was sent to endocrinology for evaluation, and appropriate repletion therapy was implemented. Subjective improvement in symptoms, along with better performance on visual field testing, was noted after initiating oral vitamin A supplementation for 5 months. CONCLUSIONS: Although vitamin A deficiency is a relatively rare disorder in the United States, it should be suspected in patients with severe liver disease or other conditions causing malabsorption who experience a loss of night vision. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Case report : vitamin a deficiency and nyctalopia in a patient with chronic pancreatitis / Anne Lee in OVS : Optometry & Vision Science, vol. 96, 06 (Juin 2019)
[article]
in OVS : Optometry & Vision Science > vol. 96, 06 (Juin 2019)
Titre : Case report : vitamin a deficiency and nyctalopia in a patient with chronic pancreatitis Type de document : article de périodique Auteurs : Anne Lee ; Nina Tran ; Jennifer Monarrez ; David Mietzner Année de publication : 2019 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Carence en vitamine A
[Thésaurus Mesh]Présentations de cas
[Thésaurus Mesh]Rétine
[Thésaurus Mesh]Troubles de la vision
[Thésaurus HELB]:Paramédical:PancréatiteMots-clés : fonction rétinienne nyctalopie Résumé : SIGNIFICANCE Vitamin A deficiency is a known concern in developing countries, but it is often overlooked in developed regions. A history of conditions causing alimentary malabsorption should be considered when patients present with complaints of nyctalopia.
PURPOSE A case of vitamin A deficiency with nyctalopia in a patient with chronic pancreatitis including pertinent diagnostic testing, treatment, and management is presented. The intent is to draw attention to the condition as a differential diagnosis for nyctalopia due to increased prevalence of conditions causing malabsorption.
CASE REPORT A patient with a history of chronic pancreatitis and pancreatic tumor presented with symptoms of nyctalopia and xerophthalmia. Given his systemic history, testing was ordered to determine serum vitamin A levels and retinal function. After results had confirmed depleted vitamin A levels and diminished retinal function, treatment with both oral and intramuscular vitamin A supplementation was initiated to normalize vitamin A levels and improve retinal photoreceptor function. Subjective improvement in symptoms was reported shortly after beginning supplementation, and ultimately, vitamin A levels and retinal function showed improvement after intramuscular treatment.
CONCLUSIONS Detailed case history and a careful review of systems along with serum vitamin A testing and, if available, electroretinography to assess retinal function can help to make a definitive diagnosis. With appropriate comanagement with the patient's primary care physician, it is possible for those with nyctalopia to begin vitamin A supplementation and regain retinal function.Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Clinical Report: Correlation of Serum Vitamins and Chalazion / Haixia Cheng in OVS : Optometry & Vision Science, vol. 99, 06 (Juin 2022)
[article]
in OVS : Optometry & Vision Science > vol. 99, 06 (Juin 2022)
Titre : Clinical Report: Correlation of Serum Vitamins and Chalazion Type de document : article de périodique Auteurs : Haixia Cheng ; Xuehua Lv ; Jiaqi Yao ; Zhijun Chen Année de publication : 2022 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Asie
[Thésaurus Mesh]Carence en vitamine A
[Thésaurus Mesh]Chalazion
[Thésaurus Mesh]Enfant
[Thésaurus Mesh]Maladies de la paupièreMots-clés : lésion inflammatoire de la paupière Résumé : SIGNIFICANCE
We demonstrate the clinical correlation between the vitamin A level with chalazion in East Chinese children. Vitamin A deficiency is likely to be a potential cause of childhood chalazion.
PURPOSE
Chalazion is the most common lid inflammatory lesion of the eyelid, which can be caused by retention of tarsal gland secretions. Studies have revealed that vitamin deficiency is an essential risk factor for children with chalazion. In this study, we measured the serum levels of vitamin A and 25-hydroxyvitamin D (25(OH)D), in patients with chalazion.
METHODS
The study included 180 subjects (90 patients with chalazion and 90 control healthy subjects) with an average age of 4.13 ± 2.01 years, and 47.8% of whom were female. Serums came from blood samples collected and used to measure the levels of vitamin A and 25(OH)D.
RESULTS
Both groups had statistically similar baseline characteristics, including age and body mass index. The average serum vitamin A levels in patients with chalazion (0.54 ± 0.15 μmol/L) were significantly lower than in their control counterparts (0.60 ± 0.15 μmol/L; P = .01). There was no significant difference in the serum 25(OH)D levels between the patients (70.15 ± 19.73 nmol/L) and control subjects (71.64 ± 24.46 nmol/L). The percentage of vitamin A deficiency in chalazion group (52.2%) was much higher than the control counterparts (28.6%; P = .001). The percentage of 25(OH)D deficiency showed no significant difference between patients with chalazion and control subjects (58.9 vs. 56.7%).
CONCLUSIONS
Low serum vitamin A was significantly associated with chalazion in children. The serum 25(OH)D level exhibited no correlation with chalazion.Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire