Gut Microbiota and Amino Acid Metabolism in Post-CPB Delayed Neurocognitive Recovery
Role of the Holdemanella Biformis-Related Amino Acid Metabolic Guild and Intestinal Barrier Injury in Cardiopulmonary Bypass-Associated Delayed Neurocognitive Recovery: A Prospective Observational Cohort Study
Delayed neurocognitive recovery (dNCR) is a common neurological complication in adult patients undergoing cardiac surgery with cardiopulmonary bypass (CPB). Emerging evidence suggests that CPB-associated hypoperfusion and perioperative stress remodel the gut microbiome and impair intestinal barrier integrity, which may contribute to neuroinflammation and cognitive decline via the gut-brain axis. This prospective observational cohort study aims to investigate the longitudinal trajectories of the gut metagenome (specifically focusing on Holdemanella biformis and amino acid metabolic functions), fecal and plasma metabolites (L-lysine, L-tryptophan, tryptophanol, and short-chain fatty acids), and plasma markers of intestinal barrier injury (I-FABP) and endotoxin response (LBP) from pre-operation (T0) to post-operation (T2) in adult CPB patients, and to evaluate their associations with postoperative dNCR and domain-specific cognitive changes.
Studienübersicht
Status
Status
Bedingungen
Bedingungen
Intervention / Behandlung
Intervention / Behandlung
Detaillierte Beschreibung
Adult patients (aged 18 years or older) scheduled for elective cardiac surgery under cardiopulmonary bypass (CPB) will be prospectively enrolled. Comprehensive neuropsychological assessments covering global cognition (MoCA), learning and memory (HVLT or RAVLT), executive function (Trail Making Test B), and attention/processing speed (Digit Span and Digit Symbol tests) will be conducted at baseline (T0: 1 to 3 days before surgery) and postoperatively (T2: 5 to 10 days after surgery or before hospital discharge). Postoperative delirium will be screened daily using CAM or CAM-ICU. Paired stool and blood samples will be collected at both T0 and T2. Stool samples will undergo shotgun metagenomic sequencing and targeted metabolomics profiling (pre-specified panel: L-lysine, L-tryptophan, tryptophanol, acetate, propionate, and butyrate). Blood samples will be analyzed for intestinal fatty acid-binding protein (I-FABP) and lipopolysaccharide-binding protein (LBP). Linear mixed-effects models and multivariable regression adjusting for age and clinical covariates will be applied to identify time-by-dNCR interaction effects and associations with the continuous global cognitive composite delta-Z score.
Studientyp
Studientyp
Einschreibung (Geschätzt)
Einschreibung
Kontakte und Standorte
Studienkontakt
Studienkontakt
- Name: Xiaoliang Wang
- Telefonnummer: 13776615743
- E-Mail: wxl145381@njmu.edu.cn
Studieren Sie die Kontaktsicherung
- Name: Feier Chen
- Telefonnummer: 18155529314
- E-Mail: Liberate0109@outlook.com
Studienorte
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Jiangsu
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Nanjing, Jiangsu, China, 210006
- Rekrutierung
- Nanjing First Hospital
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Kontakt:
- Xiaoliang Wang
- Telefonnummer: 13776615743
- E-Mail: wxl145381@njmu.edu.cn
-
Kontakt:
- Feier Chen
- Telefonnummer: 18155529314
- E-Mail: Liberate0109@outlook.com
-
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Teilnahmekriterien
Zulassungskriterien
Zulassungskriterien
Studienberechtigtes Alter
Akzeptiert gesunde Freiwillige
Studienberechtigte Geschlechter
Probenahmeverfahren
Studienpopulation
Adult patients (aged 18 years or older) admitted to Nanjing First Hospital for elective cardiac surgery requiring cardiopulmonary bypass (CPB).
Beschreibung
Inclusion Criteria:
- (1) Aged 18 years or older; (2) Scheduled for elective cardiac surgery under cardiopulmonary bypass (CPB); (3) Able to complete Chinese neurocognitive assessments at baseline; (4) Able to provide a baseline stool sample at T0 (1 to 3 days before surgery); (5) Signed informed consent obtained.
Exclusion Criteria:
- (1) Preoperative delirium; (2) Inability to complete baseline neurocognitive assessments (e.g., severe visual, auditory, or language impairment); (3) Active gastrointestinal infection or inflammatory bowel disease (IBD); (4) History of recent fecal microbiota transplantation (FMT); (5) Severe pre-existing neurological or psychiatric disorders (e.g., dementia, stroke with severe sequelae, schizophrenia).
Studienplan
Wie ist die Studie aufgebaut?
Designdetails
- Beobachtungsmodelle: COHORT
- Zeitperspektiven: PROSPECTIVE
Anzahl der Gruppen / Kohorten
Kohorten und Interventionen
Gruppe / KohorteGruppe / Kohorte |
Intervention / BehandlungIntervention / Behandlung |
|---|---|
|
Adult CPB Cohort
Adult patients aged 18 years or older undergoing elective cardiac surgery with cardiopulmonary bypass (CPB), evaluated longitudinally at T0 (1-3 days preoperatively) and T2 (5-10 days postoperatively or before discharge) for cognitive function, gut microbiome, fecal metabolites, and plasma intestinal injury biomarkers. |
Observational collection of paired stool and blood samples and administration of neuropsychological test batteries at T0 and T2 during routine perioperative care for cardiac surgery with CPB. No experimental therapeutic intervention is administered. |
Was misst die Studie?
Primäre Ergebnismessungen
Primäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
|
Change in Global Cognitive Composite Z-Score (Delta-Z)
Zeitfenster: Baseline (T0: 1 to 3 days before surgery) and Postoperative (T2: 5 to 10 days after surgery or prior to hospital discharge)
|
A composite cognitive Z-score calculated from a neuropsychological test battery assessing learning and memory (Hopkins Verbal Learning Test [HVLT] or Rey Auditory Verbal Learning Test [RAVLT]), executive function (Trail Making Test Part B [TMT-B]), and attention/processing speed (Digit Span and Digit Symbol tests). Individual test change scores (T2 minus T0) are standardized and combined into a global cognitive composite delta-Z score (higher values indicate better cognitive preservation). |
Baseline (T0: 1 to 3 days before surgery) and Postoperative (T2: 5 to 10 days after surgery or prior to hospital discharge)
|
|
Incidence of Delayed Neurocognitive Recovery (dNCR)
Zeitfenster: From baseline (T0: 1 to 3 days before surgery) to T2 (5 to 10 days after surgery or prior to hospital discharge)
|
Proportion of participants classified as having delayed neurocognitive recovery (dNCR) at T2 based on the reliable change index / pre-specified Z-score decline rules across the neuropsychological battery and Montreal Cognitive Assessment (MoCA). |
From baseline (T0: 1 to 3 days before surgery) to T2 (5 to 10 days after surgery or prior to hospital discharge)
|
Sekundäre Ergebnismessungen
Sekundäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
|
Changes in Fecal Metagenomic Taxonomic and Functional Profiles
Zeitfenster: Baseline (T0: 1 to 3 days before surgery) and Postoperative (T2: 5 to 10 days after surgery or prior to hospital discharge)
|
Longitudinal changes in gut microbial community structure, specifically the relative abundance, prevalence, and strain markers of Holdemanella biformis, and KEGG Orthology (KO)/MetaCyc functional modules related to lysine, tryptophan, phosphotransferase system (PTS), and short-chain fatty acid (SCFA) metabolism. |
Baseline (T0: 1 to 3 days before surgery) and Postoperative (T2: 5 to 10 days after surgery or prior to hospital discharge)
|
|
Changes in Fecal Targeted Amino Acid Metabolites and Short-Chain Fatty Acids (SCFAs)
Zeitfenster: Baseline (T0: 1 to 3 days before surgery) and Postoperative (T2: 5 to 10 days after surgery or prior to hospital discharge)
|
Concentrations of pre-registered fecal metabolites including L-lysine, L-tryptophan, tryptophanol, acetate, propionate, and butyrate quantified at T0 and T2. |
Baseline (T0: 1 to 3 days before surgery) and Postoperative (T2: 5 to 10 days after surgery or prior to hospital discharge)
|
|
Changes in Plasma Intestinal Fatty Acid-Binding Protein (I-FABP) and Lipopolysaccharide-Binding Protein (LBP)
Zeitfenster: Baseline (T0: 1 to 3 days before surgery) and Postoperative (T2: 5 to 10 days after surgery or prior to hospital discharge)
|
Blood levels of I-FABP (marker of intestinal epithelial injury) and LBP (marker of host endotoxin response) measured by ELISA. |
Baseline (T0: 1 to 3 days before surgery) and Postoperative (T2: 5 to 10 days after surgery or prior to hospital discharge)
|
|
Incidence of Postoperative Delirium (POD)
Zeitfenster: Postoperative Day 1 through Postoperative Day 7 (or hospital discharge)
|
Assessed daily after surgery using the Confusion Assessment Method (CAM) or CAM for the Intensive Care Unit (CAM-ICU). |
Postoperative Day 1 through Postoperative Day 7 (or hospital discharge)
|
Mitarbeiter und Ermittler
Sponsor
Sponsor
Ermittler
Ermittler
- Studienleiter: Xiaoliang Wang, The First Affiliated Hospital with Nanjing Medical University
Studienaufzeichnungsdaten
Haupttermine studieren
Studienbeginn (Tatsächlich)
Studienbeginn
Primärer Abschluss (Geschätzt)
Primärer Abschluss
Studienabschluss (Geschätzt)
Studienabschluss
Studienanmeldedaten
Zuerst eingereicht
Zuerst eingereicht
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst gepostet (Tatsächlich)
Zuerst gepostet
Studienaufzeichnungsaktualisierungen
Letztes Update gepostet (Tatsächlich)
Letztes Update gepostet
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Zuletzt verifiziert
Zuletzt verifiziert
Mehr Informationen
Begriffe im Zusammenhang mit dieser Studie
Schlüsselwörter
Andere Studien-ID-Nummern
Andere Studien-ID-Nummern
- KY20190404-03-KS-01
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