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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

2026년 7월 28일 업데이트: 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.

연구 개요

상태

아직 모집하지 않음

정황

상세 설명

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.

연구 유형

관찰

등록 (추정된)

182

연락처 및 위치

이 섹션에서는 연구를 수행하는 사람들의 연락처 정보와 이 연구가 수행되는 장소에 대한 정보를 제공합니다.

연구 연락처

연구 장소

  • 중국
    • Beijing Municipality
      • Beijing, Beijing Municipality, 중국, 100730
        • Peking Union Medical College Hospital
        • 연락하다:

참여기준

연구원은 적격성 기준이라는 특정 설명에 맞는 사람을 찾습니다. 이러한 기준의 몇 가지 예는 개인의 일반적인 건강 상태 또는 이전 치료입니다.

자격 기준

공부할 수 있는 나이

  • 성인
  • 고령자

건강한 자원 봉사자를 받아들입니다

아니

샘플링 방법

비확률 샘플

연구 인구

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.

설명

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).

공부 계획

이 섹션에서는 연구 설계 방법과 연구가 측정하는 내용을 포함하여 연구 계획에 대한 세부 정보를 제공합니다.

연구는 어떻게 설계됩니까?

디자인 세부사항

코호트 및 개입

그룹/코호트
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.

연구는 무엇을 측정합니까?

주요 결과 측정

결과 측정
측정값 설명
기간
Predictive performance of multi-dimensional gut microbiota-metabolite model for postoperative CSA-AKI
기간: 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)

2차 결과 측정

결과 측정
측정값 설명
기간
Incidence of cardiac surgery-associated acute kidney injury (CSA-AKI) within 7 days after cardiac surgery
기간: 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
기간: 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

공동 작업자 및 조사자

여기에서 이 연구와 관련된 사람과 조직을 찾을 수 있습니다.

스폰서

Peking Union Medical College Hospital

수사관

  • 수석 연구원: Yu, Peking Union Medical College Hospital

연구 기록 날짜

이 날짜는 ClinicalTrials.gov에 대한 연구 기록 및 요약 결과 제출의 진행 상황을 추적합니다. 연구 기록 및 보고된 결과는 공개 웹사이트에 게시되기 전에 특정 품질 관리 기준을 충족하는지 확인하기 위해 국립 의학 도서관(NLM)에서 검토합니다.

연구 주요 날짜

연구 시작 (추정된)

2026년 8월 1일

기본 완료 (추정된)

2027년 4월 1일

연구 완료 (추정된)

2027년 8월 1일

연구 등록 날짜

최초 제출

2026년 7월 28일

QC 기준을 충족하는 최초 제출

2026년 7월 28일

처음 게시됨 (실제)

2026년 7월 31일

연구 기록 업데이트

마지막 업데이트 게시됨 (실제)

2026년 7월 31일

QC 기준을 충족하는 마지막 업데이트 제출

2026년 7월 28일

마지막으로 확인됨

2026년 7월 1일

추가 정보

이 연구와 관련된 용어

키워드

기타 연구 ID 번호

  • K10744

개별 참가자 데이터(IPD) 계획

개별 참가자 데이터(IPD)를 공유할 계획입니까?

예

IPD 계획 설명

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.

IPD 공유 액세스 기준

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

IPD 공유 지원 정보 유형

  • 연구_프로토콜
  • 수액
  • ICF
  • ANALYTIC_CODE
  • CSR

약물 및 장치 정보, 연구 문서

미국 FDA 규제 의약품 연구

아니

미국 FDA 규제 기기 제품 연구

아니

이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .

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