Malheiro, FilipaÂngelo-Dias, MiguelLopes, TeresaAzeredo-Lopes, SofiaMartins, CatarinaBorrego, Luis MiguelBORREGO, LUIS MIGUEL2024-02-192024-02-192024-012079-9721PURE: 83168409PURE UUID: 3bebf654-0788-4950-a93f-c650bba7adbeScopus: 85183422865PubMed: 38248369PubMedCentral: PMC10814478ORCID: /0000-0003-4708-438X/work/153567110ORCID: /0000-0003-0353-0421/work/153567205ORCID: /0000-0001-9933-4075/work/206216928http://hdl.handle.net/10362/163806Funding Information: This research was funded by the Learning Health Hospital da Luz. LH.INV.F2019002. Publisher Copyright: © 2024 by the authors.Acute pancreatitis (AP) is an increasingly frequent disease in which inflammation plays a crucial role. Fifty patients hospitalized with AP were included and peripheral blood samples were analyzed for B and T cell subpopulations at the time of hospitalization and 48 h after diagnosis. The Bedside Index of Severity in Acute Pancreatitis (BISAP) and length of hospital stay were also recorded. A healthy control (HC) group of 15 outpatients was included. AP patients showed higher neutrophil/lymphocyte (N/L) ratios and higher percentages of B cells than the HC group. The total B cell percentages were higher in patients with moderate/severe AP than in patients with mild AP. The percentages of B cells as well as the percentages of the CD27−IgD− B cell subset decreased from admission to 48 h after admission. The patients with higher BISAP scores showed lower percentages of peripheral lymphocytes but higher percentages of CD27−IgD− B cells. Higher BISAP scores, N/L ratios, and peripheral blood B cell levels emerged as predictors of hospital stay length in AP patients. Our findings underscore the importance of early markers for disease severity. Additionally, the N/L ratio along with the BISAP score and circulating B cell levels form a robust predictive model for hospital stay duration of AP patients.4341832engacute pancreatitisB cellbiomarkerlymphocyteprognosisseverityT cellGeneral Medicinejournal article10.3390/diseases12010018https://www.scopus.com/pages/publications/85183422865