Alterações de parâmetros laboratoriais em pacientes com COVID-19: uma revisão sistemática / Changes in laboratory parameters in patients with COVID-19: a systematic review

O objetivo deste estudo foi identificar e reunir os principais achados disponíveis no começo da pandemia, acerca das alterações laboratoriais de pacientes internados com COVID-19 e discutir a predominância dessas alterações na gravidade do curso da doença. Trata-se de uma revisão sistemática de literatura, restringida a publicações até abril de 2020, utilizando as bases de dados Lilacs e Pubmed. Um total de 381 publicações foram encontradas nas bases de dados consultadas e destas, 17 publicações foram elegíveis para análise conforme os critérios de inclusão e exclusão. Parâmetros laboratoriais como a redução de linfócitos e elevação de D-dímeros, lactato desidrogenase e proteína C reativa parecem estar ligados à infecção pelo SARS-CoV-2 e podem servir como indicadores prognósticos da doença. A linfocitopenia e o aumento de D-dímeros são marcadores relacionados ao agravamento da doença e a desfechos desfavoráveis como óbito.

The objective of this study was to identify and gather the main findings available at the beginning of the pandemic, regarding laboratory alterations of hospitalized patients with COVID-19 and to discuss the predominance of these alterations in the severity of the course of the disease. This is a systematic literature review, restricted to publications until April 2020, using the Lilacs and Pubmed databases. A total of 381 publications were found in the consulted databases and of these, 17 publications were eligible for analysis according to the inclusion and exclusion criteria. Laboratory parameters such as the reduction of lymphocytes and the elevation of D-dimers, lactate dehydrogenase and C-reactive protein appear to be linked to SARS-CoV-2 infection and may serve as prognostic indicators of the disease. Lymphocytopenia and increased D-dimers are markers related to disease worsening and unfavorable outcomes such as death.

Determination of Endogenous Concentrations of Uracil and Dihydrouracil in Dried Saliva Spots by LC-MS/MS: Method Development, Validation, and Clinical Application.

BACKGROUND: The aim of this study was to develop and validate a liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay for the measurement of uracil (U) and dihydrouracil (UH2) concentrations in dried saliva spots (DSSs), for the evaluation of dihydropyrimidine dehydrogenase (DPD) enzyme activity. RESULTS: Nine 18-mm diameter DSS discs were extracted with acetate:isopropyl alcohol (85:15, vol/vol) and analyzed by LC-MS/MS. The assay was linear in the range of 10-1000 ng·mL, with accuracy between 89% and 112% and precision between 5.7% and 13%. The metabolic ratio [UH2]/[U] was stable in DSS for up to 9 days at 45°C. Concentrations of U and UH2, as well as the metabolic ratio, were highly concordant between matrices. Using a metabolic ratio classification cutoff of 1.16 for the identification of slow DPD metabolizers, 98.7% concordance was achieved between SS and saliva. CONCLUSIONS: DSS samples could be a useful alternative for DPD activity screening, particularly in locations with limited access to highly equipped laboratories.