{"id":1413,"date":"2026-03-15T10:58:51","date_gmt":"2026-03-15T10:58:51","guid":{"rendered":"https:\/\/perfusfind.com\/ic\/?p=1413"},"modified":"2026-03-15T10:58:51","modified_gmt":"2026-03-15T10:58:51","slug":"serum-biomarkers-of-delirium-in-critical-illness-a-systematic-review-of-mechanistic-and-diagnostic-evidence","status":"publish","type":"post","link":"https:\/\/perfusfind.com\/ic\/index.php\/2026\/03\/15\/serum-biomarkers-of-delirium-in-critical-illness-a-systematic-review-of-mechanistic-and-diagnostic-evidence\/","title":{"rendered":"Serum biomarkers of delirium in critical illness: a systematic review of mechanistic and diagnostic evidence"},"content":{"rendered":"

Serum Biomarkers of Delirium in Critical Illness<\/p>\n

Abstract:<\/strong><\/p><\/blockquote>\n

Delirium is a frequent and serious complication of critical illness, with up to 80% of ventilated ICU patients affected. This systematic review synthesized evidence from 28 studies assessing 54 serum biomarkers related to delirium, grouped into six mechanistic categories: CNS injury, immune activation, hormonal dysregulation, neurotransmission, coagulation, and amino acid metabolism. The review highlights methodological inconsistencies but identifies promising signals, especially for astrocytic and axonal injury markers.<\/p>\n

\"\"<\/p>\n

Key Insights:<\/strong><\/p><\/blockquote>\n

    \n
  1. Delirium in the ICU is linked to increased morbidity, mortality, and long-term cognitive impairment, with risk factors spanning patient-related predispositions and ICU-specific precipitants .<\/li>\n
  2. Fifty-four unique serum biomarkers were studied, highlighting the broad search for biological correlates of delirium .<\/li>\n
  3. CNS injury biomarkers such as S100\u03b2 and neurofilament light chain (NfL) showed the strongest and most consistent associations with delirium presence and severity .<\/li>\n
  4. Neurofilament heavy chain, GFAP, UCH-L1, tau, and NSE were studied less frequently but add to evidence of astrocytic and axonal injury as drivers of delirium pathogenesis .<\/li>\n
  5. Inflammatory biomarkers including IL-6, CRP, and TNF-\u03b1 were the most studied immune markers, but results were inconsistent, reflecting systemic inflammation\u2019s non-specific role .<\/li>\n
  6. Hormonal markers such as cortisol, prolactin, and leptin demonstrated preliminary promise, suggesting stress and endocrine dysregulation may contribute to delirium .<\/li>\n
  7. Neurotransmitter-related biomarkers (serotonin, substance P, serum amyloid A) produced mixed results, challenging the classical neurotransmitter imbalance hypothesis of delirium .<\/li>\n
  8. Coagulation-related markers (D-dimer, PAI-1, vWF) and amino acids (tryptophan, tyrosine, phenylalanine) were variably linked to delirium, underscoring metabolic complexity .<\/li>\n
  9. Major limitations included heterogeneity in delirium assessment tools, biomarker sampling timelines, confounding adjustment, and lack of replication across cohorts .<\/li>\n
  10. The authors propose a mechanistic \u201cendotyping\u201d framework that integrates biomarker profiles with clinical and neurophysiological data to identify biologically distinct delirium subtypes for future precision medicine .<\/li>\n<\/ol>\n

    Conclusion:<\/strong><\/p><\/blockquote>\n

    Serum biomarkers such as S100\u03b2 and NfL hold potential for illuminating delirium pathogenesis in critical illness, especially regarding astrocytic and axonal injury. However, inconsistent findings and methodological heterogeneity limit clinical applicability. Progress will require harmonized biomarker protocols, longitudinal designs, and integration with EEG, imaging, and cognitive outcomes to enable mechanistic endotyping and precision-targeted delirium therapies.<\/p>\n

    Take-Home for Clinicians:<\/strong> Biomarkers of CNS injury currently show the greatest potential, but no serum marker is ready for clinical use in ICU delirium diagnosis. The future lies in multimodal profiling that can separate biological subtypes of delirium and match interventions to underlying mechanisms.<\/p><\/blockquote>\n

    Discussion Question:<\/strong> Could biomarker-driven endotyping transform delirium care by enabling targeted pharmacologic and supportive interventions, or will the heterogeneity of critical illness always limit generalizability?<\/p>\n

    ACCESS FULL ARTICLE HERE<\/a><\/strong><\/p>\n

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    This is another step in making high-quality, evidence-based information easily accessible to the critical care community. As always, thank you for your continued support!<\/p>\n

    As always, don\u2019t forget to like, share, and subscribe. See you on the other side!<\/em><\/p>\n

    \n

    Open Access<\/strong> This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http:\/\/creativecommons.org\/licenses\/by\/4.0\/<\/strong><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Serum Biomarkers of Delirium in Critical Illness Abstract: Delirium is a frequent and serious complication of critical illness, with up to 80% of ventilated ICU patients affected. This systematic review synthesized evidence from 28 studies assessing 54 serum biomarkers related to delirium, grouped into six mechanistic categories: CNS injury, immune activation, hormonal dysregulation, neurotransmission, coagulation, […]<\/p>\n","protected":false},"author":1,"featured_media":1421,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[7],"tags":[179,412,527],"class_list":["post-1413","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-neurology","tag-biomarkers","tag-delirium","tag-serum-biomarkers"],"yoast_head":"\nSerum biomarkers of delirium in critical illness: a systematic review of mechanistic and diagnostic evidence - 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