Titre : Carence en vitamine B12

Carence en vitamine B12 : Questions médicales fréquentes

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peut-elle être asymptomatique ?\nQuel rôle joue l'historique médical dans le diagnostic ?", "url": "https://questionsmedicales.fr/mesh/D014806?page=9#section-diagnostic" }, { "@type": "MedicalWebPage", "name": "Symptômes", "headline": "Symptômes sur Carence en vitamine B12", "description": "Quels sont les symptômes courants de la carence en B12 ?\nLa carence en B12 peut-elle causer des problèmes neurologiques ?\nComment la carence affecte-t-elle la peau ?\nY a-t-il des symptômes digestifs associés ?\nLes symptômes varient-ils selon l'âge ?", "url": "https://questionsmedicales.fr/mesh/D014806?page=9#section-symptômes" }, { "@type": "MedicalWebPage", "name": "Prévention", "headline": "Prévention sur Carence en vitamine B12", "description": "Comment prévenir la carence en vitamine B12 ?\nLes personnes âgées doivent-elles prendre des suppléments ?\nLes végétaliens peuvent-ils éviter la carence ?\nLes tests réguliers sont-ils recommandés ?\nLes maladies digestives augmentent-elles le risque ?", "url": "https://questionsmedicales.fr/mesh/D014806?page=9#section-prévention" }, { "@type": "MedicalWebPage", "name": "Traitements", "headline": "Traitements sur Carence en vitamine B12", "description": "Comment traiter une carence en vitamine B12 ?\nQuelle est la durée du traitement ?\nLes aliments peuvent-ils aider à corriger la carence ?\nLes personnes végétariennes sont-elles à risque ?\nLes traitements sont-ils différents pour les enfants ?", "url": "https://questionsmedicales.fr/mesh/D014806?page=9#section-traitements" }, { "@type": "MedicalWebPage", "name": "Complications", "headline": "Complications sur Carence en vitamine B12", "description": "Quelles complications peuvent survenir ?\nLa carence peut-elle entraîner des problèmes cognitifs ?\nY a-t-il un risque accru de maladies cardiovasculaires ?\nLes complications sont-elles réversibles ?\nLa carence en B12 peut-elle affecter la grossesse ?", "url": "https://questionsmedicales.fr/mesh/D014806?page=9#section-complications" }, { "@type": "MedicalWebPage", "name": "Facteurs de risque", "headline": "Facteurs de risque sur Carence en vitamine B12", "description": "Qui est le plus à risque de carence en B12 ?\nLes maladies auto-immunes augmentent-elles le risque ?\nLes médicaments peuvent-ils influencer le risque ?\nLes troubles digestifs sont-ils un facteur de risque ?\nLes antécédents familiaux jouent-ils un rôle ?", "url": "https://questionsmedicales.fr/mesh/D014806?page=9#section-facteurs de risque" } ] }, { "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Comment diagnostiquer une carence en vitamine B12 ?", "position": 1, "acceptedAnswer": { "@type": "Answer", "text": "Un diagnostic se fait par des analyses sanguines mesurant les niveaux de vitamine B12." } }, { "@type": "Question", "name": "Quels tests sont utilisés pour confirmer la carence ?", "position": 2, "acceptedAnswer": { "@type": "Answer", "text": "Les tests incluent la mesure de la vitamine B12, de l'homocystéine et de la méthylmalonyl-CoA." } }, { "@type": "Question", "name": "Quels signes cliniques indiquent une carence ?", "position": 3, "acceptedAnswer": { "@type": "Answer", "text": "Des signes comme l'anémie, la fatigue, et des troubles neurologiques peuvent indiquer une carence." } }, { "@type": "Question", "name": "La carence en B12 peut-elle être asymptomatique ?", "position": 4, "acceptedAnswer": { "@type": "Answer", "text": "Oui, certaines personnes peuvent avoir une carence sans présenter de symptômes visibles." } }, { "@type": "Question", "name": "Quel rôle joue l'historique médical dans le diagnostic ?", "position": 5, "acceptedAnswer": { "@type": "Answer", "text": "L'historique médical aide à identifier des facteurs de risque comme des troubles d'absorption." } }, { "@type": "Question", "name": "Quels sont les symptômes courants de la carence en B12 ?", "position": 6, "acceptedAnswer": { "@type": "Answer", "text": "Les symptômes incluent fatigue, faiblesse, engourdissements et troubles de l'humeur." } }, { "@type": "Question", "name": "La carence en B12 peut-elle causer des problèmes neurologiques ?", "position": 7, "acceptedAnswer": { "@type": "Answer", "text": "Oui, elle peut entraîner des troubles neurologiques comme des démences ou des neuropathies." } }, { "@type": "Question", "name": "Comment la carence affecte-t-elle la peau ?", "position": 8, "acceptedAnswer": { "@type": "Answer", "text": "Elle peut provoquer des changements cutanés comme une pâleur ou des lésions cutanées." } }, { "@type": "Question", "name": "Y a-t-il des symptômes digestifs associés ?", "position": 9, "acceptedAnswer": { "@type": "Answer", "text": "Oui, des symptômes comme des nausées, des diarrhées ou des troubles digestifs peuvent survenir." } }, { "@type": "Question", "name": "Les symptômes varient-ils selon l'âge ?", "position": 10, "acceptedAnswer": { "@type": "Answer", "text": "Oui, les symptômes peuvent être plus prononcés chez les personnes âgées en raison de l'absorption réduite." } }, { "@type": "Question", "name": "Comment prévenir la carence en vitamine B12 ?", "position": 11, "acceptedAnswer": { "@type": "Answer", "text": "Une alimentation équilibrée incluant des sources de B12 et des suppléments si nécessaire aide." } }, { "@type": "Question", "name": "Les personnes âgées doivent-elles prendre des suppléments ?", "position": 12, "acceptedAnswer": { "@type": "Answer", "text": "Oui, les personnes âgées peuvent avoir besoin de suppléments en raison d'une absorption réduite." } }, { "@type": "Question", "name": "Les végétaliens peuvent-ils éviter la carence ?", "position": 13, "acceptedAnswer": { "@type": "Answer", "text": "Ils doivent prendre des suppléments de B12 ou consommer des aliments enrichis pour éviter la carence." } }, { "@type": "Question", "name": "Les tests réguliers sont-ils recommandés ?", "position": 14, "acceptedAnswer": { "@type": "Answer", "text": "Oui, des tests réguliers sont conseillés pour les personnes à risque de carence." } }, { "@type": "Question", "name": "Les maladies digestives augmentent-elles le risque ?", "position": 15, "acceptedAnswer": { "@type": "Answer", "text": "Oui, des maladies comme la maladie de Crohn peuvent affecter l'absorption de la vitamine B12." } }, { "@type": "Question", "name": "Comment traiter une carence en vitamine B12 ?", "position": 16, "acceptedAnswer": { "@type": "Answer", "text": "Le traitement inclut des suppléments oraux ou des injections de vitamine B12 selon la gravité." } }, { "@type": "Question", "name": "Quelle est la durée du traitement ?", "position": 17, "acceptedAnswer": { "@type": "Answer", "text": "La durée dépend de la gravité, mais peut durer de quelques mois à plusieurs années." } }, { "@type": "Question", "name": "Les aliments peuvent-ils aider à corriger la carence ?", "position": 18, "acceptedAnswer": { "@type": "Answer", "text": "Oui, consommer des aliments riches en B12 comme la viande, le poisson et les produits laitiers aide." } }, { "@type": "Question", "name": "Les personnes végétariennes sont-elles à risque ?", "position": 19, "acceptedAnswer": { "@type": "Answer", "text": "Oui, elles peuvent être à risque en raison d'un apport alimentaire limité en vitamine B12." } }, { "@type": "Question", "name": "Les traitements sont-ils différents pour les enfants ?", "position": 20, "acceptedAnswer": { "@type": "Answer", "text": "Les traitements sont similaires, mais les doses peuvent varier selon l'âge et le poids." } }, { "@type": "Question", "name": "Quelles complications peuvent survenir ?", "position": 21, "acceptedAnswer": { "@type": "Answer", "text": "Des complications incluent l'anémie mégaloblastique, des troubles neurologiques et des problèmes cardiaques." } }, { "@type": "Question", "name": "La carence peut-elle entraîner des problèmes cognitifs ?", "position": 22, "acceptedAnswer": { "@type": "Answer", "text": "Oui, une carence prolongée peut causer des troubles cognitifs et des pertes de mémoire." } }, { "@type": "Question", "name": "Y a-t-il un risque accru de maladies cardiovasculaires ?", "position": 23, "acceptedAnswer": { "@type": "Answer", "text": "Oui, une carence en B12 peut augmenter le risque de maladies cardiovasculaires en élevant l'homocystéine." } }, { "@type": "Question", "name": "Les complications sont-elles réversibles ?", "position": 24, "acceptedAnswer": { "@type": "Answer", "text": "Certaines complications peuvent être réversibles avec un traitement approprié, d'autres non." } }, { "@type": "Question", "name": "La carence en B12 peut-elle affecter la grossesse ?", "position": 25, "acceptedAnswer": { "@type": "Answer", "text": "Oui, elle peut entraîner des complications pendant la grossesse, comme des malformations congénitales." } }, { "@type": "Question", "name": "Qui est le plus à risque de carence en B12 ?", "position": 26, "acceptedAnswer": { "@type": "Answer", "text": "Les personnes âgées, les végétariens, et ceux ayant des troubles d'absorption sont à risque." } }, { "@type": "Question", "name": "Les maladies auto-immunes augmentent-elles le risque ?", "position": 27, "acceptedAnswer": { "@type": "Answer", "text": "Oui, des maladies comme la gastrite atrophique peuvent affecter l'absorption de la B12." } }, { "@type": "Question", "name": "Les médicaments peuvent-ils influencer le risque ?", "position": 28, "acceptedAnswer": { "@type": "Answer", "text": "Oui, certains médicaments comme les inhibiteurs de la pompe à protons peuvent réduire l'absorption." } }, { "@type": "Question", "name": "Les troubles digestifs sont-ils un facteur de risque ?", "position": 29, "acceptedAnswer": { "@type": "Answer", "text": "Oui, des troubles comme la maladie cœliaque peuvent nuire à l'absorption de la vitamine B12." } }, { "@type": "Question", "name": "Les antécédents familiaux jouent-ils un rôle ?", "position": 30, "acceptedAnswer": { "@type": "Answer", "text": "Oui, des antécédents familiaux de carence peuvent augmenter le risque chez certains individus." } } ] } ] }

Sources (10000 au total)

Markers of Vitamin B12 Status in Relation to Cerebrospinal Fluid Biomarkers of Alzheimer's Disease and Cognitive Performance.

The association between markers of vitamin B12 status and cerebrospinal fluid (CSF) biomarkers of Alzheimer's disease (AD), which precede cognitive impairment, has been investigated by only a few smal... The aim of this study was to investigate the associations of vitamin B12-related markers with CSF biomarkers of AD and cognitive performance.... Data included 462 patients aged 40 to 94 years referred to the Memory Clinic of the Ulm University Hospital, Ulm, Germany. Vitamin B12, holotranscobalamin (HoloTC), homocysteine (tHcy), and methylmalo... In the multi-adjusted model, higher levels of MMA were associated with raised CSF total-tau values: the odds ratios (ORs) 95% confidence intervals (CIs) were 3.25 (95% CI = 1.35-7.76) for the highest ... Markers of vitamin B12 may be independent predictors of CSF biomarkers of AD and cognitive functioning, with MMA showing the most consistent effects. Randomized controlled trials are needed to determi...

Influence of metformin intake on serum vitamin B12 levels in patients with type 2 diabetes mellitus.

To describe the prevalence of vitamin B12 deficiency among Jordanian patients with type 2 diabetes mellitus treated with metformin and to compare the findings with those who did not receive metformin.... Total 155 patients with type 2 diabetes mellitus, aged between 48 and 82 years were enrolled in the current study. They were divided into two groups; the first (n = 120) was treated with metformin whi... The mean serum ± standard deviation (SD) vitamin B12 level was significantly lower in patients who were treated with metformin (268.5 ± 35.8 vs. 389.5 ± 29.8 pg/ml, p = 0.029). The metformin group had... There is a significant association between metformin intake and vitamin B12 deficiency. Serum vitamin B12 levels should be checked by physicians and serial monitoring is necessary in patients who are ...

Pernicious anemia is a common cause of cobalamin deficiency-caused megaloblastic anemia in Hainan, China.

Pernicious anemia (PA) is believed to be highly prevalent in Western countries but has rarely been reported in China. The study explores whether PA, an autoimmune disease, is an uncommon cause of coba... Clinical and hematological data were collected from 90 cobalamin deficiency-caused megaloblastic anemia (MA) patients between July 2014 and December 2021. Through anti-intrinsic factor antibody (IFA) ... Of the 30 HCs, only one tested positive for IFA, and all 30 tested negative for PCA. Among the 90 patients with cobalamin deficiency-caused MA, 76.7% were positive for IFA, and 47.8% were positive for... The proportion of PA in cobalamin deficiency-caused MA patients in Hainan province was higher than 80%, which was more common than expected. Therefore, screening for IFA, PCA, endoscopic biopsy, and t...

Association between Acid-Lowering Agents, Metformin, and Vitamin B12 among Boston-Area Puerto Ricans.

Vitamin B12 involves several physiological functions, and malabsorption is reported with medication use.... Studies have reported an inverse association between the use of metformin or acid-lowering agents (ALAs), such as proton pump inhibitors, histamine 2 receptor antagonists, and blood vitamin B12 concen... This analysis was conducted within the Boston Puerto Rican Health Study (BPRHS), an ongoing longitudinal cohort that enrolled 1499 Puerto Rican adults aged 45-75 y at baseline. Our study comprised 142... At baseline, we observed an association between metformin use (β = -0.069; P = 0.03) and concomitant ALA and metformin use (β = -0.112; P = 0.02) and vitamin B12 concentration, but not a deficiency. W... These results suggest an inverse relationship between metformin, concomitant ALA, metformin use, and serum vitamin B12 concentration....

Vitamin B12 responsive developmental and epileptic encephalopathy due to a novel mutation in the FUT2 gene: a case report.

Vitamin B12 deficiency is a recognised cause of neurological manifestations, including peripheral neuropathy, behavioural changes, and seizures. However, developmental and epileptic encephalopathy due... An 11-month-old girl of non-consanguineous parents presented with recurrent episodes of seizures since four months. Her seizures started as flexor epileptic spasms occurring in clusters resembling inf... We report a novel variant in the FUT2 gene associated with vitamin B12-responsive developmental and epileptic encephalopathy and megaloblastic anaemia. This case report highlights the importance of ti...

A randomized, double-blind, placebo-controlled, 12-week trial of vitamin D augmentation in major depressive disorder associated with vitamin D deficiency.

Randomized controlled trials (RCTs) of vitamin D (VitD) supplementation for depression have yielded inconsistent results. We conducted the first RCT of VitD supplementation with multipoint serum 25(OH... We randomized antidepressant-free depressed adults with mean baseline 25(OH)D of 11.5 ng/ml to VitD (60,000 IU every 5 days; n = 31) or placebo (n = 28) for 12 weeks. All patients also received escita... In an intent-to-treat analysis, mean Hamilton Depression Scale scores dropped from 25.7 to 5.7 and from 25.8 to 5.0 in VitD and placebo groups, respectively (primary outcome; P = 0.92). VitD and place... A ceiling effect with escitalopram may have prevented the discovery of benefits with VitD supplementation.... VitD supplementation does not improve antidepressant outcomes with flexibly dosed escitalopram. VitD deficient depressed patients may require higher antidepressant doses to experience benefits similar...