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Estudo Geral
Master thesis . 2019
Data sources: Estudo Geral
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Doseamento de Vitamina D em Crianças com Hepatopatia Crónica

Authors: Figueiredo, Hugo Miguel Barcelos;

Doseamento de Vitamina D em Crianças com Hepatopatia Crónica

Abstract

A hepatopatia crónica em idade pediátrica está associada a défices de vitaminas lipossolúveis, nomeadamente da vitamina D. Além da sua importância no metabolismo fosfocálcico, a vitamina D apresenta também funções imunorreguladoras. O objetivo principal deste projeto é verificar se o nível sérico de vitamina D em crianças e adolescentes com hepatopatia crónica é influenciado pelo estado de inflamação. Secundariamente, pretende-se identificar que outros fatores podem influenciar os níveis séricos de vitamina D nesta população de risco. Realizou-se um estudo retrospetivo no qual foram analisados os doseamentos de vitamina D realizados em crianças e adolescentes com hepatopatia crónica, seguidos na Unidade de Transplantação Hepática – Hospital Pediátrico do Centro Hospitalar e Universitário de Coimbra, num período de três anos, 2015 a 2017. Foram colhidos dados sociodemográficos e somatométricos, doença de base, estação do ano, dados laboratoriais e uso de suplementação vitamínica. Considerou-se deficiência grave de vitamina D valores séricos inferiores a 20 ng/mL e deficiência ligeira valores entre os 20 e os 30 ng/mL. Para a análise estatística foi utilizado SPSS versão 21.0. No período do estudo foram analisados 200 doseamentos de vitamina D, correspondentes a 73 doentes, com uma idade mediana de 7 anos (mínimo 5 meses; máximo 17 anos), sendo 50% do género feminino. A maioria dos doseamentos de vitamina D foi realizada em doentes pós-transplante hepático (67%). Existia deficiência grave em 21.5% dos doseamentos e ligeira em 36.5%. Foi demonstrada uma correlação negativa fraca entre os valores de vitamina D e os de Proteína C-reativa (Rho de Spearman -0.249). Verificou-se também uma correlação negativa fraca entre os valores de vitamina D e a aspartato aminotransferase (Rho de Spearman -0.196), alanina aminotransferase (Rho de Spearman -0.155), fosfatase alcalina (Rho de Spearman -0.155) e gama glutamil transferase (Rho de Spearman -0.235). Não foi encontrada correlação com a bilirrubina total, International Normalized Ratio, plaquetas e Índice de Massa Corporal. Não foram encontradas diferenças estatisticamente significativas nos valores de vitamina D dividindo a amostra quanto ao género, raça, estação do ano, transplantação prévia ou suplementação de vitamina D. O estado de inflamação parece influenciar negativamente o valor sérico de vitamina D, pelo que, em doentes com situação de inflamação aguda, isto deve ser considerado. Como esperado, o nível sérico de vitamina D é tendencialmente mais baixo quanto mais grave for o estado de citólise e de colestase. Não foi possível identificar subgrupos de risco, sendo necessária a monitorização dos valores desta vitamina e seu tratamento de forma individualizada.

Chronic liver disease in pediatric age is associated with deficits in fat-soluble vitamins, particularly vitamin D. In addition to its importance in phosphorus and calcium metabolism, vitamin D also has immunoregulatory functions. The main objective is to verify if the vitamin D levels in children and adolescents with chronic liver disease is influenced by inflammation. Secondarily, it is pretended to identify what other factors may influence the vitamin D levels in this at-risk population. A retrospective study was carried out in order to analyze the vitamin D assays performed in children and adolescents with chronic liver disease, followed in the Unidade de Transplantação Hepática – Hospital Pediátrico do Centro Hospitalar e Universitário de Coimbra, during a period of three years, between 2015 and 2017. To characterize the sample, socio-demographic and somatometric data were collected, as well as data related to the underlying disease, laboratory data, season of the year and usage of vitamin D supplements. Vitamin D levels below 20 ng/mL were considered as severe deficiency and levels between 20 and 30 ng/mL were considered as mild deficiency. For the statistical analysis, SPSS version 21.0 was used. During the study period, 200 vitamin D assays were performed, corresponding to 73 patients, with a median age of 7 years (minimum 5 months, maximum 17 years), being 50% of those female. Most vitamin D assays were performed in post-liver transplant patients (67%). It was found severe deficiency in 21.5% of the assays and mild deficiency in 36.5%. A weak negative correlation was found between vitamin D and C-reactive protein levels (Spearman's Rho -0.249). There was also a weak negative correlation between vitamin D levels and aspartate aminotransferase (Spearman's Rho -0.196), alanine aminotransferase (Spearman's Rho -0.155), alkaline phosphatase (Spearman's Rho -0.155) and gamma glutamyl transferase (Spearman's Rho -0.235). No statistically significant differences were found in vitamin D levels when sorting the sample by gender, race, season, previous transplantation, or vitamin D supplementation. The inflammation status appears to have a negative influence on the serum vitamin D levels, so, in patients with acute inflammation, this should be considered. Vitamin D level is lower as cytolysis and cholestasis is more severe. It was not possible to identify at-risk subgroups, so frequent monitoring of vitamin D levels and individualized treatment is still necessary.

Trabalho Final do Mestrado Integrado em Medicina apresentado à Faculdade de Medicina

Country
Portugal
Related Organizations
Keywords

Pediatric, Pediatria, Vitamina D, Doença Hepática Crónica, Vitamin D, Chronic Liver Disease

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green