Association of vitamin D with the severity of disease and mortality in COVID-19: Prospective study in central India.

Background: Many factors have been proposed to be associated with the severity of disease and mortality in COVID-19. Vitamin D had recently been reviewed as one of these factors. Aim and Objectives: To evaluate the association between Vitamin D and the disease severity and mortality in COVID-19. Materials and Methods: After approval from Institutional Ethics Committee, this prospective cohort study was carried out in selected tertiary care teaching medical institutes of Central India. Participants were COVID-19 patients of the age group of 18 years and above admitted during the study period. They were categorized into four groups as asymptomatic (Group A), mild (Group B), moderate (Group C), and severe (Group D) based on clinical symptoms, respiratory rate, oxygen saturation, and chest imaging. Serum level of Vitamin 25(OH) D was measured using chemiluminescent immunoassay. The outcome of the disease was classified as recovery and death during hospitalization. The association of sociodemographic and medical characteristics with treatment outcome was studied using an appropriate statistical test. A full logistic regression model was built for the assessment of the relationship between treatment outcomes with Vitamin D level. Further, one receiver operating characteristic curve was developed to examine the prognostic significance of Vitamin D levels in COVID-19 patients. Results: Out of 748 enrolled patients, 44 (5.88%), had severe disease (Group D). A total of 721 cases (96.39%) recovered and were discharged, whereas 27 (3.61%) died during hospitalization. Mean Vitamin D level was found to be significantly different in discharged patients compared to those who were deceased. Increasing age-adjusted odds ratio (AOR) (95% confidence interval [CI]=1.07 [1.02-1.12]), known hypertension AOR (95%CI) = 3.38 (1.13-10.08), and diabetes mellitus AOR (95%CI) =28.5 (6.04-134.13) were found to be significant predictors of death among COVID-19 patients. Increasing Vitamin D level was found to be protective against COVID-19-related death (AOR (95% CI = 0.87 [0.80-0.94]). Conclusion: Vitamin D was significantly associated with the disease severity and mortality in COVID-19.

Résumé Contexte: Il a été proposé que de nombreux facteurs soient associés à la gravité de la maladie et de la mortalité dans le Covid - 19. La vitamine D avait récemment été examinée comme l'un de ces facteurs. Objectif et objectifs: évaluer l'association entre la vitamine D et la gravité de la maladie et la mortalité dans le Covid-19. Matériel et méthodes: Après l'approbation du comité d'éthique institutionnel, cette étude de cohorte prospective a été réalisée dans des instituts médicaux d'enseignement des soins tertiaires de l'Inde centrale. Les participants étaient des patients Covid-19 du groupe d'âge de 18 ans et plus admis au cours de la période d'étude. Ils ont été classés en quatre groupes comme asymptomatiques (groupe A), légers (groupe B), modérés (groupe C) et sévères (groupe D) sur la base des symptômes cliniques, de la fréquence respiratoire, de la saturation en oxygène et de l'imagerie thoracique. Niveau sérique de la vitamine 25 (OH) DWAS mesuré en utilisant l'immunodosage chimioluminescent. L'issue de la maladie a été classée comme récupération et décès pendant l'hospitalisation. L'association des caractéristiques sociodémographiques et médicales avec les résultats du traitement a été étudiée à l'aide d'un test statistique approprié. Un modèle de régression logistique complet a été construit pour l'évaluation de la relation entre les résultats du traitement au niveau de la vitamine D. De plus, une courbe caractéristique de fonctionnement du récepteur a été développée pour examiner la signification pronostique des niveaux de vitamine D chez les patients COVID-19. Résultats: Sur 748 patients inscrits, 44 (5,88%), avaient une maladie grave (groupe D). Un total de 721 cas (96,39%) ont récupéré et ont été libérés, tandis que 27 (3,61%) sont décédés pendant l'hospitalisation. Le niveau moyen de la vitamine D s'est révélé significativement différent chez les patients libérés par rapport à ceux qui ont été décédés. Augmentation du rapport de cotes ajusté à l'âge (AOR) (intervalle de confiance à 95% [IC] = 1,07 [1,02­1,12]), hypertension connue AOR (IC à 95%) = 3,38 (1,13­10,08) et diabète mellite aor (IC 95% ) = 28,5 (6,04­134.13) se sont révélés être des prédicteurs significatifs de la mort chez les patients COVID-19. L'augmentation du niveau de vitamine D s'est avérée protectrice contre la mort liée au Covid - 19 (AOR (IC à 95% = 0,87 [0,80­0,94]). Conclusion: La vitamine D était significativement associée à la gravité de la maladie et à la mortalité dans le Covid - 19. Mots clés: Covid - 19, tempête de cytokines, mortalité, gravité, vitamine D.

The study of serum hsCRP, ferritin, IL-6 and plasma D-dimer in COVID-19: a retrospective study.

OBJECTIVES: The cut off values for serum high sensitivity C-reactive protein (hsCRP), ferritin, interleukin 6 (IL-6) and plasma D-dimer could be of profound help in detecting COVID-19 patients at risk of adverse outcomes. Therefore, the aim of the present study is to determine the cut off values of the serum hsCRP, ferritin, IL-6 and plasma D-dimer in predicting mortality in COVID-19 patients. METHODS: Four hundred RT-PCR confirmed cases of COVID-19 were sub divided into two groups based on their outcome during hospitalisation. Group I consisted of survivors and Group II consisted of non-survivors. The survivors were further divided into three sub-groups: mild, moderate and severe based on the severity of infection. The laboratory data of serum hsCRP, ferritin, IL-6 and plasma D-dimer for all these patients was retrieved from the Medical Record Section of the Hospital. RESULTS: Mean serum hsCRP, ferritin, IL-6 and plasma D-dimer levels were significantly higher in non-survivors as compared to survivors of COVID-19. The levels of these biomarkers correlated with the severity of COVID-19 illness. ROC curve analysis revealed that plasma D-dimer is having a better predictive value as compared to other parameters in predicting mortality in COVID-19. CONCLUSIONS: The serum hsCRP, ferritin, IL-6 and plasma D-dimer levels could be used in risk stratification of COVID-19 patients. The optimum cut off given by the current study could be considered in predicting adverse outcome in these patients. Amongst the many studied biomarkers, plasma D-dimer might be the best early biomarker to predict mortality in COVID-19 patients.