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.
연구 개요
상태
상세 설명
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.
연구 유형
등록 (추정된)
연락처 및 위치
연구 연락처
- 이름: Xiaoliang Wang
- 전화번호: 13776615743
- 이메일: wxl145381@njmu.edu.cn
연구 연락처 백업
- 이름: Feier Chen
- 전화번호: 18155529314
- 이메일: Liberate0109@outlook.com
연구 장소
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Jiangsu
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Nanjing, Jiangsu, 중국, 210006
- 모병
- Nanjing First Hospital
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연락하다:
- Xiaoliang Wang
- 전화번호: 13776615743
- 이메일: wxl145381@njmu.edu.cn
-
연락하다:
- Feier Chen
- 전화번호: 18155529314
- 이메일: Liberate0109@outlook.com
-
-
참여기준
자격 기준
공부할 수 있는 나이
건강한 자원 봉사자를 받아들입니다
연구 대상 성별
샘플링 방법
연구 인구
Adult patients (aged 18 years or older) admitted to Nanjing First Hospital for elective cardiac surgery requiring cardiopulmonary bypass (CPB).
설명
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).
공부 계획
연구는 어떻게 설계됩니까?
디자인 세부사항
- 관찰 모델: COHORT
- 시간 관점: PROSPECTIVE
코호트 및 개입
그룹/코호트 |
개입 / 치료 |
|---|---|
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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. |
연구는 무엇을 측정합니까?
주요 결과 측정
결과 측정 |
측정값 설명 |
기간 |
|---|---|---|
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Change in Global Cognitive Composite Z-Score (Delta-Z)
기간: Baseline (T0: 1 to 3 days before surgery) and Postoperative (T2: 5 to 10 days after surgery or prior to hospital discharge)
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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)
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Incidence of Delayed Neurocognitive Recovery (dNCR)
기간: From baseline (T0: 1 to 3 days before surgery) to T2 (5 to 10 days after surgery or prior to hospital discharge)
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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)
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2차 결과 측정
결과 측정 |
측정값 설명 |
기간 |
|---|---|---|
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Changes in Fecal Metagenomic Taxonomic and Functional Profiles
기간: Baseline (T0: 1 to 3 days before surgery) and Postoperative (T2: 5 to 10 days after surgery or prior to hospital discharge)
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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)
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Changes in Fecal Targeted Amino Acid Metabolites and Short-Chain Fatty Acids (SCFAs)
기간: 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)
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Changes in Plasma Intestinal Fatty Acid-Binding Protein (I-FABP) and Lipopolysaccharide-Binding Protein (LBP)
기간: 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)
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Incidence of Postoperative Delirium (POD)
기간: Postoperative Day 1 through Postoperative Day 7 (or hospital discharge)
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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)
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공동 작업자 및 조사자
스폰서
수사관
- 연구 책임자: Xiaoliang Wang, The First Affiliated Hospital with Nanjing Medical University
연구 기록 날짜
연구 주요 날짜
연구 시작 (실제)
기본 완료 (추정된)
연구 완료 (추정된)
연구 등록 날짜
최초 제출
QC 기준을 충족하는 최초 제출
처음 게시됨 (실제)
연구 기록 업데이트
마지막 업데이트 게시됨 (실제)
QC 기준을 충족하는 마지막 업데이트 제출
마지막으로 확인됨
추가 정보
이 연구와 관련된 용어
기타 연구 ID 번호
- KY20190404-03-KS-01
개별 참가자 데이터(IPD) 계획
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