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CONTEXTE / OBJECTIF: La nutrition des patients en hémodialyse (HD) est souvent inadéquate, notamment en ce qui concerne l'acide ascorbique (AA). Il est rapporté que chaque session HD peut entraîner une diminution de 50 à 75% des taux plasmatiques d'AA. Certaines études ont montré que la supplémentation en AA peut modifier les résultats des maladies rénales chroniques - troubles osseux minéraux (CKD-MBD), mais l’effet de AA sur les patients HD atteints de MCK-MBD reste controversé. En conséquence, nous avons décidé de réaliser une méta-analyse pour évaluer l'efficacité de la supplémentation en AA chez les patients atteints de néphropathie chronique coronarienne nécessitant une dialyse. MÉTHODES: Une recherche a été effectuée à l'aide de Pubmed, d'EMBASE, du registre central des essais contrôlés de Cochrane, de l'infrastructure de connaissances nationale chinoise (CNKI), de la base de données Wanfang et de la base de données d'informations VIP jusqu'en avril 2018 pour toutes les publications en anglais et en chinois. Les principaux indicateurs de notre étude étaient les modifications des taux sériques de phosphate (P), de calcium (Ca) et d’hormone parathyroïdienne (PTH) après traitement par AA. L'efficacité de l'AA a été évaluée par différence moyenne pondérée (DMP) et intervalle de confiance (IC). Les événements cardiovasculaires, la mortalité et les événements indésirables rapportés au cours de l'expérience ont également été notés. RÉSULTATS: Au total, 371 patients dans six études ont été impliqués dans cette méta-analyse. Par rapport au placebo, le traitement par AA n'a eu aucun effet positif sur le P sérique (353 patients; WMD = -0,05; IC à 95%, -0,3 à 0,2; I2 = 28%) ou sur les taux de PTH (275 patients; WMD = -17,04; 95% CI, -63,79 à 29,72; I2 = 75%). La différence moyenne regroupée de la variation des taux de Ca par rapport aux valeurs initiales était plus élevée dans le groupe recevant un traitement par AA par rapport au placebo (353 patients; DMP = 0,15; IC à 95%: 0,01 à 0,3; I2 = 0%). Aucun effet secondaire n'a été observé. CONCLUSION: Notre revue systématique et notre méta-analyse ne supportent pas la prescription d'AA aux patients HD atteints de MRC. Les AA n’ont eu aucun effet positif sur les patients atteints de la MPC car ils ne pouvaient pas influencer les taux sériques de P ou de PTH, mais ils ont augmenté les taux sériques de Ca à court terme.
Source: https://www.ncbi.nlm.nih.gov/pubmed/30248670