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Development and Validation of a Risk Prediction Model for Cardiac Surgery-associated Acute Kidney Injury Based on the Gut-Kidney Axis, Incorporating Gut Microbiota and Their Metabolites

28. července 2026 aktualizováno: Peking Union Medical College Hospital
This is a single-center prospective observational cohort study enrolling adult patients scheduled for cardiac surgery. Multi-timepoint clinical indicators, stool samples for gut microbiota and metabolomics profiling and artery blood will be collected before and after surgery. We aim to construct and validate a multi-dimensional preoperative predictive model for CSA-AKI based on clinical, microbial and metabolic signatures. Meanwhile, this research will explore the potential mediating role of the gut-kidney axis in the pathogenesis of cardiac surgery-associated acute kidney injury, and provide novel mechanistic evidence for early risk stratification and intervention of CSA-AKI.

Přehled studie

Postavení

Zatím nenabíráme

Podmínky

Detailní popis

Cardiac surgery-associated acute kidney injury (CSA-AKI) is one of the most common severe postoperative complications after cardiac surgery, which significantly increases the risks of prolonged hospitalization, chronic kidney disease and all-cause mortality. Current single-index risk scoring systems cannot fully predict individual CSA-AKI risk, and the underlying pathological mechanism remains incompletely clarified. Emerging evidence reveals that gut dysbiosis and altered intestinal metabolites participate in kidney injury via the gut-kidney axis, while few prospective cohort studies integrate multi-omics data to develop preoperative predictive models for CSA-AKI.

This prospective cohort study will consecutively recruit adult subjects receiving elective cardiac surgery at Peking Union Medical College Hospital. Basic demographic data, laboratory examinations, intraoperative and postoperative clinical parameters will be recorded at multiple perioperative time points. Fresh stool specimens and artery blood will be collected from all participants before surgery, 24 hours and 7 days after cardiac surgery for 16S rRNA gene sequencing and untargeted metabolomics analysis to characterize gut microbial composition and metabolite profiles.

The primary objective is to develop and internally validate a multi-dimensional predictive model combining clinical variables, gut flora biomarkers and metabolic signatures to stratify preoperative CSA-AKI risk of cardiac surgical patients. Secondary objectives include comparing the differences of intestinal microbiota and metabolites between patients with and without subsequent CSA-AKI, screening key microbial strains and differential metabolites related to postoperative renal impairment, and elucidate the molecular pathways of the gut-kidney axis mediating CSA-AKI occurrence.

All participants will receive standardized perioperative management following clinical guidelines. Subjects will be followed up until 7 days after surgery to identify CSA-AKI events defined by standardized serum creatinine criteria. The performance of the established prediction model will be evaluated by area under the receiver operating characteristic curve (AUC), calibration curve and decision curve analysis. All specimen testing and statistical analyses will be conducted following standardized omics and clinical research workflows. This study is approved by the institutional ethics committee, and written informed consent will be obtained from all enrolled patients prior to sample and data collection.

Typ studie

Pozorovací

Zápis (Odhadovaný)

182

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní kontakt

Studijní místa

    • Beijing Municipality
      • Beijing, Beijing Municipality, Čína, 100730
        • Peking Union Medical College Hospital
        • Kontakt:

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

  • Dospělý
  • Starší dospělý

Přijímá zdravé dobrovolníky

Ne

Metoda odběru vzorků

Vzorek nepravděpodobnosti

Studijní populace

This single-center prospective observational cohort will consecutively enroll adult patients aged ≥18 years who receive elective cardiac surgery at Peking Union Medical College Hospital. Eligible subjects include patients undergoing valve surgery, coronary artery bypass grafting (CABG), or combined cardiac procedures.All enrolled participants will complete standardized perioperative data collection and serial stool sample and blood collection at preoperative baseline, postoperative day 1 and postoperative day 7. Subjects will be followed up until postoperative day 7 to identify CSA-AKI events based on KDIGO 2012 criteria.

Popis

Inclusion Criteria:

  1. Aged 18 years or older;
  2. Scheduled for elective cardiac surgery;
  3. Surgery performed under cardiopulmonary bypass (CPB);
  4. Able to complete preoperative stool and blood sample collection independently;
  5. The patient and their family members voluntarily participate in this study, agree to the collection of preoperative stool samples, blood samples and clinical data, cooperate with follow-up visits, and sign the informed consent form.-

Exclusion Criteria:

(1) Patients with end-stage renal disease or dependence on renal replacement therapy before surgery; (2) Patients with a preoperative estimated glomerular filtration rate (eGFR) < 30 ml/min/1.73m² or severe chronic kidney disease (CKD stage 4-5); (3) Patients with a history of renal transplantation or unilateral nephrectomy; (4) Patients who received antibiotic treatment within 4 weeks before surgery; (5) Patients who took probiotic or prebiotic preparations within 4 weeks before surgery; (6) Patients with a previous history of intestinal surgery, such as colectomy and small bowel resection; (7) Patients with active inflammatory bowel disease, chronic diarrhea or constipation requiring pharmacological intervention; (8) Patients with preoperative intestinal obstruction, gastrointestinal bleeding, or those requiring fasting for more than 24 hours; (9) Patients undergoing emergency surgery (time from admission to surgery < 24 hours), or those unable to complete preoperative informed consent, dietary investigation and baseline sample collection; (10) Patients who received mechanical bowel preparation (e.g., enema) within 24 hours before surgery; (11) Patients with preoperative active infection or sepsis; (12) Patients treated with preoperative glucocorticoids or immunosuppressants (excluding routine doses); (13) Patients who died intraoperatively or within 24 hours postoperatively, or those who could not complete the evaluation of the primary outcome (postoperative 7-day acute kidney injury [AKI]); (14) Female patients who are pregnant, lactating or in menstruation; (15) Patients complicated with gastrointestinal malignant tumors or receiving systemic chemotherapy, targeted therapy or abdominal radiotherapy; (16) Patients with severe liver disease (Child-Pugh grade B or above).

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

Kohorty a intervence

Skupina / kohorta
all patients undergoing elective cardiac surgery
Consecutive adult patients scheduled for cardiac surgery. Multi-timepoint clinical data and stool samples are collected to build preoperative CSA-AKI prediction model, subgroup analysis will be performed according to postoperative AKI outcomes.

Co je měření studie?

Primární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Predictive performance of multi-dimensional gut microbiota-metabolite model for postoperative CSA-AKI
Časové okno: From preoperative sample collection to postoperative day 7 (CSA-AKI confirmation)
The primary outcome is the discriminative ability (AUC) of the combined preoperative gut microbiota and metabolomic signature model to predict cardiac surgery-associated acute kidney injury (CSA-AKI). CSA-AKI is diagnosed per KDIGO 2012 criteria: serum creatinine rises ≥0.3 mg/dL within 48h postoperatively or ≥1.5-fold baseline within 7 days after cardiac surgery. The predictive performance of the multi-omics combined model will be quantified by the area under the receiver operating characteristic curve (AUC-ROC).
From preoperative sample collection to postoperative day 7 (CSA-AKI confirmation)

Sekundární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Incidence of cardiac surgery-associated acute kidney injury (CSA-AKI) within 7 days after cardiac surgery
Časové okno: 7 days after cardiac surgery
CSA-AKI is diagnosed in accordance with the KDIGO 2012 AKI standard: serum creatinine increases by ≥0.3 mg/dL within 48 hours postoperatively, or serum creatinine reaches ≥1.5 times the preoperative baseline value within 7 days after cardiac surgery. The incidence rate is calculated as the proportion of patients who meet the CSA-AKI diagnostic criteria among all enrolled subjects.
7 days after cardiac surgery
Severity grading of CSA-AKI according to KDIGO 2012 staging criteria
Časové okno: 7 days after cardiac surgery
For subjects diagnosed with CSA-AKI within postoperative 7 days, stratify patients into KDIGO Stage 1, Stage 2 and Stage 3 based on the maximum serum creatinine elevation during follow-up, and compare the distribution of AKI severity grades in the cohort.
7 days after cardiac surgery

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Sponzor

Vyšetřovatelé

  • Vrchní vyšetřovatel: Yu, Peking Union Medical College Hospital

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia (Odhadovaný)

1. srpna 2026

Primární dokončení (Odhadovaný)

1. dubna 2027

Dokončení studie (Odhadovaný)

1. srpna 2027

Termíny zápisu do studia

První předloženo

28. července 2026

První předloženo, které splnilo kritéria kontroly kvality

28. července 2026

První zveřejněno (Aktuální)

31. července 2026

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Aktuální)

31. července 2026

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

28. července 2026

Naposledy ověřeno

1. července 2026

Více informací

Termíny související s touto studií

Další identifikační čísla studie

  • K10744

Plán pro data jednotlivých účastníků (IPD)

Plánujete sdílet data jednotlivých účastníků (IPD)?

ANO

Popis plánu IPD

De-identified individual participant data (including perioperative clinical laboratory data, gut microbiota sequencing raw data, stool metabolomics and blood data, and standardized case report forms) will be shared with qualified researchers after the completion of primary study analysis and the publication of core research manuscripts. All personal identifiable information will be permanently removed to protect patient privacy in compliance with Chinese medical research ethics regulations.

Kritéria přístupu pro sdílení IPD

Data will become available 6 months after full study completion and primary manuscript publication; data access will remain available for 5 years after publication.

Typ podpůrných informací pro sdílení IPD

  • PROTOKOL STUDY
  • MÍZA
  • ICF
  • ANALYTIC_CODE
  • CSR

Informace o lécích a zařízeních, studijní dokumenty

Studuje lékový produkt regulovaný americkým FDA

Ne

Studuje produkt zařízení regulovaný americkým úřadem FDA

Ne

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