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An Observational Case Control Study to Identify the Role of MV and MV Derived Micro-RNA in Post CArdiac Surgery AKI (MaRACAS)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02315183
Recruitment Status : Completed
First Posted : December 11, 2014
Last Update Posted : January 30, 2020
Information provided by (Responsible Party):
University of Leicester

Brief Summary:
Acute kidney injury (AKI) complicates over 25% of cardiac surgical procedures where it increases mortality up to fourfold. The incidence of AKI is increasing, the pathogenesis is poorly understood, current diagnostic tests lack specificity and sensitivity, and there is no effective treatment. Improving outcomes in patients at risk of AKI has recently been defined as an NHS priority. The primary aim of this study is to determine how plasma derived microvesicles (MV) or more specifically MV associated microRNAs (miRNA) regulate survival and signalling in post cardiac surgery AKI. The study involves a clinical and experimental research project that will combine laboratory analyses of circulating MV and miRNA from clinical studies. The study will specifically consider how MV and miRNA alter inflammatory signaling in kidneys after cardiac surgery, how these are modified by important clinical risk factors, and whether they may serve as early biomarkers of injury.

Condition or disease Intervention/treatment
Acute Kidney Injury Other: This is an observational Study

Detailed Description:
AKI is characterised by upregulation of competing pro-survival and pro- inflammatory/ apoptotic signaling pathways whereby processes associated with renal recovery; tubular epithelial phenotypic change and proliferation occur simultaneously with those associated with diminished GFR, vascular inflammation, tubular dysfunction and epithelial apoptosis. Protection from AKI can be achieved by altering the balance of these pathways; for example upregulation of the pivotal phosphatidylinositol 3-kinase - serine-threonine protein kinase B (PI3K-Akt) pro-survival pathway following the administration of erythropoietin or insulin like growth factor inhibits experimental AKI following renal ischaemia and reperfusion in rodents and swine. In our own work we have shown that post cardiopulmonary bypass (CPB) AKI in swine can be prevented by the administration of either a phosphodiesterase type 5 (PDE-5) inhibitor which promotes cell survival and endothelial homeostasis via augmentation of endogenous nitric oxide (NO) signalling, or by the inhibition of endothelin-1 (ET-1), an important pro-inflammatory mediator and promoter of oxidative stress in renal injury How these competing pathways are regulated in patients at risk of AKI is poorly understood however, and it is our belief that the identification of these processes will facilitate the development of new and effective prevention and treatment strategies for AKI and improved outcomes for patients

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Study Type : Observational
Actual Enrollment : 96 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: An Observational Case Control Study to Identify the Role of MV and MV Derived Micro-RNA in Post CArdiac Surgery Acute Kidney Injury: The MaRACAS Study
Study Start Date : January 2014
Actual Primary Completion Date : March 2016
Actual Study Completion Date : March 2016

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Heart Surgery

Intervention Details:
  • Other: This is an observational Study
    THis study has no intervention
    Other Name: MaRACAS Study

Primary Outcome Measures :
  1. AKI defined according to the KDIGO criteria or by urine NGAL levels >150nmol/mg at 6 hours postoperatively. [ Time Frame: 2 Years ]

Secondary Outcome Measures :
  1. Data on demographics, perioperative clinical characteristics and medications. [ Time Frame: 2 Years ]
  2. MV will be isolated from arterial blood samples collected prior to anaesthetic induction, at chest closure and at 6 and 24 hours postoperatively, and characterised using flow cytometry and NanoSight LM10 (Nanosight, London, UK). [ Time Frame: 2 Years ]
  3. Likely sources of MV will also be evaluated; Platelet and monocyte activation and aggregation will be determined by flow cytometry, endothelial activation will be determined by ELISA measurement of circulating ICAM and E-selectin in serum. [ Time Frame: 2 Years ]
  4. MV associated miRNA profiles will be determined using microarray in patients with AKI (n=6 diabetic, n=6 non diabetic) and a matched control group (n=6 diabetic, n=6 non diabetic) without AKI. [ Time Frame: 2 Years ]
  5. The systemic inflammatory response will be quantified by measurement of serum IL-8 and IL-6. [ Time Frame: 2 Years ]
  6. Renal inflammation will be determined by urine Neutrophil Gelatinase-Associated Lipocalin (NGAL) and Liver type- Fatty Acid Binding Protein (L-FABP) measured at baseline, and then at 6 and 24 hours postoperatively. [ Time Frame: 2 Years ]
  7. MV and MV associated miRNA signaling will be evaluated ex vivo in a micro fluidics model. [ Time Frame: 2 Years ]

Biospecimen Retention:   Samples Without DNA
Blood and Urine samples are taken at numerous timepoints upto 5 days post cardiac surgery.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   16 Years and older   (Child, Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
The study will be carried out at a large tertiary academic cardiac surgery unit in the UK; the University Hospitals of Leicester NHS Trust. This unit performs over 1,200 major cardiac procedures per year, of which 300 are expected to develop acute kidney injury.

Inclusion Criteria:

  1. Adult cardiac surgery patients (>16 years) undergoing coronary artery bypass grafting or valve surgery with moderately hypothermic CPB (32-34°C) blood cardioplegia.
  2. Identified as being at increased risk for AKI from a modified risk score.

Exclusion Criteria:

  1. Patients with pre-existing inflammatory state: sepsis undergoing treatment, acute kidney injury within 5 days, chronic inflammatory disease, congestive heart failure,
  2. Emergency or salvage procedure,
  3. Ejection fraction <30 %,
  4. Patient in a critical preoperative state (Kidney Disease: Improving Global Outcomes (KDIGO) Stage 3 AKI or requiring ionotropes, ventilation or intra-aortic balloon pump).
  5. Pregnancy.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02315183

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United Kingdom
Department of Cardiovascular Sciences.
Leicester, Leicestershire, United Kingdom, LE3 9QP
Sponsors and Collaborators
University of Leicester
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Principal Investigator: Gavin Murphy, Prof University of Leicester
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Responsible Party: University of Leicester Identifier: NCT02315183    
Other Study ID Numbers: 0419
First Posted: December 11, 2014    Key Record Dates
Last Update Posted: January 30, 2020
Last Verified: December 2014
Keywords provided by University of Leicester:
Post cardiac surgery
Additional relevant MeSH terms:
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Acute Kidney Injury
Renal Insufficiency
Kidney Diseases
Urologic Diseases
Female Urogenital Diseases
Female Urogenital Diseases and Pregnancy Complications
Urogenital Diseases
Male Urogenital Diseases