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.
研究概览
地位
详细说明
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.
研究类型
注册 (估计的)
联系人和位置
学习联系方式
- 姓名：Xiaoliang Wang
- 电话号码：13776615743
- 邮箱：wxl145381@njmu.edu.cn
研究联系人备份
- 姓名：Feier Chen
- 电话号码：18155529314
- 邮箱：Liberate0109@outlook.com
学习地点
-
-
Jiangsu
-
Nanjing、Jiangsu、中国、210006
- 招聘中
- Nanjing First Hospital
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接触：
- Xiaoliang Wang
- 电话号码：13776615743
- 邮箱：wxl145381@njmu.edu.cn
-
接触：
- Feier Chen
- 电话号码：18155529314
- 邮箱：Liberate0109@outlook.com
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-
参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
取样方法
研究人群
Adult patients (aged 18 years or older) admitted to Nanjing First Hospital for elective cardiac surgery requiring cardiopulmonary bypass (CPB).
描述
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).
学习计划
研究是如何设计的？
设计细节
- 观测模型：COHORT
- 时间观点：PROSPECTIVE
队列和干预
团体/队列 |
干预/治疗 |
|---|---|
|
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. |
研究衡量的是什么？
主要结果指标
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
|
Change in Global Cognitive Composite Z-Score (Delta-Z)
大体时间：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)
大体时间：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)
|
次要结果测量
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
|
Changes in Fecal Metagenomic Taxonomic and Functional Profiles
大体时间：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)
大体时间：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)
大体时间：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)
大体时间：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)
|
合作者和调查者
调查人员
- 研究主任：Xiaoliang Wang、The First Affiliated Hospital with Nanjing Medical University
研究记录日期
研究主要日期
学习开始 (实际的)
初级完成 (估计的)
研究完成 (估计的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (实际的)
研究记录更新
最后更新发布 (实际的)
上次提交的符合 QC 标准的更新
最后验证
更多信息
与本研究相关的术语
其他研究编号
- KY20190404-03-KS-01
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