MRI Assessment of Myocardial Fibrosis Associated With Monocyte Phenotype in End Stage Renal Failure

NCT ID: NCT03857633

Last Updated: 2021-10-08

Basic Information

• Recruitment Status: WITHDRAWN
• Study Classification: OBSERVATIONAL
• Study Start Date: 2019-02-01
• Study Completion Date: 2021-02-01

Brief Summary

Firstly, this study aims to understand how cardiac fibrosis mediated by inflammatory microvascular disease evolves during advanced chronic kidney disease and end stage renal failure and importantly how this changes with commencement on renal replacement therapy (haemodialysis and peritoneal dialysis) using sequential cardiac MRI imaging. This method of imaging is non-invasive, provides significantly more data than echocardiography, is reproducible and accurate, has been validated in numerous studies and does not involve exposure to ionising radiation.

Secondly, this study aims to examine the changes in monocyte subsets and biochemical profile in peripheral blood prior to, during and after commencement on renal replacement therapy.

The investigators hypothesis would be that renal failure causes alteration in monocyte subset phenotype resulting in increased circulating inflammatory monocytes (human CD14high CD16high), initiating pro-inflammatory cytokine expression and thereby accelerating inflammatory cardiovascular disease and development of myocardial fibrosis.

Detailed Description

There is significant excess of cardiac mortality in patients with end stage renal failure (ESRF) - 15 to 20% relative increased risk of cardiac death compared to the normal population. 20-30% of patients on renal replacement therapy (RRT) die from a cardiac cause (UK Renal Registry Data, 2016). However, only 30% have macrovascular disease at the time of autopsy. There is therefore a significant component of cardiac morbidity and mortality in this population that is mediated by microvascular disease and cardiac fibrosis. This includes abnormal myocardial remodelling, increased ventricular stiffness and ventricular hypertrophy, with development of arrhythmia and cardiac failure as well as increased atherosclerotic disease burden. Renal replacement therapy in itself also induces a pro-inflammatory response in patients increasing cardiac risk and there is poor understanding as to how to mediate this risk.

There is a lack of evidence in how to manage both patients and the RRT process to minimise the risk of patients developing cardiac disease. The mechanisms underlying this enhanced risk are not fully understood nor explained by traditional cardiovascular risk factors. The investigators propose to study the mechanism by which this might be mediated.

The investigators have previously reported alterations in monocyte subset populations in CKD patients that importantly predict CVD events. Furthermore, the investigators have shown that dyslipidaemia influences monocyte/macrophage phenotypes. The investigators propose an important interaction exists between chronic inflammation in the uraemic state, dyslipidaemia and the formation of deleterious monocyte/macrophage phenotypes that accelerates atherosclerosis. Cardiac MRI has been used in recent years to accurately assess the degree of cardiac fibrosis in end stage renal failure.

This clinical study builds on previous clinical and non-clinical studies at Imperial College London by unifying basic science, animal models and imaging studies into the clinical context of end stage renal failure. Increased understanding of the changes in cardiac function related to development of end stage renal failure and commencement on renal replacement therapy will provide significant and novel opportunities to optimise the management of patients in the pre-dialysis setting and prevent cardiovascular complications caused by long term renal replacement therapy.

This clinical observational study will involve the recruitment of 30 participants from general nephrology services at Imperial College Healthcare NHS Trust at CKD stage 4/5 with progressive decline in renal function (anticipated start on renal replacement therapy within 6 months). Participants will be divided into two cohorts of haemodialysis and peritoneal dialysis to enable comparison between the renal replacement modalities. As part of participants recruitment they will undergo comprehensive medical assessment and will remain under the follow-up of the renal team at frequent intervals.

Enrolled participants will undergo cardiac MRI imaging at three time points - First when initially recruited at CKD4/5, second at the point of commencement on renal replacement therapy (~6 months) and third after a further 6 months on renal replacement therapy. MRI results will be analysed at these time points for development of fibrotic and function change.

In partnership with MRI imaging patients will have blood samples collected at the same time intervals for analysis of blood count, biochemical markers, monocyte and lipid phenotypes.

Conditions

Myocardial Fibrosis; End Stage Renal Failure on Dialysis; Chronic Kidney Disease, Stage IV (Severe); Chronic Kidney Disease Stage V; Heart Failure

Study Design

• Observational Model Type: COHORT
• Study Time Perspective: PROSPECTIVE

Study Groups

Pre Dialysis (CKD Stage 4/5)

Patients recruited from low clearance clinic with advanced CKD (stage 4/5). Patients will undergo Cardiac MRI 1 - With Gadolinium Contrast at the time of recruitment and Cardiac MRI 2 - With Gadolinium Contrast at time of commencement on renal replacement therapy. Patients will have Peripheral Whole Blood Samples taken at defined intervals.

Cardiac MRI 1 - With Gadolinium Contrast

Intervention Type: DIAGNOSTIC_TEST

Cines for cardiac function and volumes, T2 myomaps, Resting perfusion and strain analysis, Tagging (strain), T1 myomaps, Late gadolinium enhancement

During the MRI scan participants would be required perform a short period of low intensity exercise involving peddling on an adapted cycle for 10-15 minutes to provide additional data on cardiac function under exertion.

Cardiac MRI 2 - With Gadolinium Contrast

Intervention Type: DIAGNOSTIC_TEST

Cines for cardiac function and volumes, T2 myomaps, Resting perfusion and strain analysis, Tagging (strain), T1 myomaps, Late gadolinium enhancement

During the MRI scan participants would be required perform a short period of low intensity exercise involving peddling on an adapted cycle for 10-15 minutes to provide additional data on cardiac function under exertion.

Peripheral Whole Blood Samples

Intervention Type: DIAGNOSTIC_TEST

20ml EDTA whole blood samples - collected sequentially during study - max 8 time points

Haemodialysis Dialysis (CDK Stage 5d)

Patients started on Haemodialysis will have Cardiac MRI 3 - With Gadolinium Contrast after 6 months of therapy. Patients will have Peripheral Whole Blood Samples taken at defined intervals.

Cardiac MRI 3 - With Gadolinium Contrast

Intervention Type: DIAGNOSTIC_TEST

Cines for cardiac function and volumes, T2 myomaps, Resting perfusion and strain analysis, Tagging (strain), T1 myomaps, Late gadolinium enhancement

During the MRI scan participants would be required perform a short period of low intensity exercise involving peddling on an adapted cycle for 10-15 minutes to provide additional data on cardiac function under exertion.

Peripheral Whole Blood Samples

Intervention Type: DIAGNOSTIC_TEST

20ml EDTA whole blood samples - collected sequentially during study - max 8 time points

Peritoneal Dialysis (CDK Stage 5d)

Patients started on Peritoneal Dialysis will have Cardiac MRI 3 - Without Gadolinium Contrast after 6 months of therapy. Patients will have Peripheral Whole Blood Samples taken at defined intervals.

Cardiac MRI 3 - Without Gadolinium Contrast

Intervention Type: DIAGNOSTIC_TEST

Cines for cardiac function and volumes, T2 myomaps, Resting perfusion and strain analysis, Tagging (strain), T1 myomaps.

During the MRI scan participants would be required perform a short period of low intensity exercise involving peddling on an adapted cycle for 10-15 minutes to provide additional data on cardiac function under exertion.

Peripheral Whole Blood Samples

Intervention Type: DIAGNOSTIC_TEST

20ml EDTA whole blood samples - collected sequentially during study - max 8 time points

Interventions

Cardiac MRI 1 - With Gadolinium Contrast

Cines for cardiac function and volumes, T2 myomaps, Resting perfusion and strain analysis, Tagging (strain), T1 myomaps, Late gadolinium enhancement

During the MRI scan participants would be required perform a short period of low intensity exercise involving peddling on an adapted cycle for 10-15 minutes to provide additional data on cardiac function under exertion.

Intervention Type: DIAGNOSTIC_TEST

Cardiac MRI 2 - With Gadolinium Contrast

Cines for cardiac function and volumes, T2 myomaps, Resting perfusion and strain analysis, Tagging (strain), T1 myomaps, Late gadolinium enhancement

During the MRI scan participants would be required perform a short period of low intensity exercise involving peddling on an adapted cycle for 10-15 minutes to provide additional data on cardiac function under exertion.

Intervention Type: DIAGNOSTIC_TEST

Cardiac MRI 3 - Without Gadolinium Contrast

Cines for cardiac function and volumes, T2 myomaps, Resting perfusion and strain analysis, Tagging (strain), T1 myomaps.

During the MRI scan participants would be required perform a short period of low intensity exercise involving peddling on an adapted cycle for 10-15 minutes to provide additional data on cardiac function under exertion.

Intervention Type: DIAGNOSTIC_TEST

Cardiac MRI 3 - With Gadolinium Contrast

Cines for cardiac function and volumes, T2 myomaps, Resting perfusion and strain analysis, Tagging (strain), T1 myomaps, Late gadolinium enhancement

During the MRI scan participants would be required perform a short period of low intensity exercise involving peddling on an adapted cycle for 10-15 minutes to provide additional data on cardiac function under exertion.

Intervention Type: DIAGNOSTIC_TEST

Peripheral Whole Blood Samples

20ml EDTA whole blood samples - collected sequentially during study - max 8 time points

Intervention Type: DIAGNOSTIC_TEST

Eligibility Criteria

Inclusion Criteria

1. Patients with a diagnosis of Chronic Kidney Disease stage 4 and above

2. Patients with a progressive decline in renal function with a expectation to require future renal replacement therapy or currently on renal replacement therapy (Haemodialysis or Peritoneal Dialysis)

3. Exclusion of macrovascular cardiac disease within the last 3 years

4. Access for haemodialysis planned via tunnelled central venous catheter

Exclusion Criteria

1. Age under eighteen

2. Patients with a diagnosis of Diabetes Mellitus

3. Untreated macrovascular cardiac disease or Acute Coronary syndrome within 6 months of recruitment

4. Previous or current treatment with immunosuppressive/modulatory therapy

5. Current Malignancy

6. Current use of Metformin

7. Pregnancy

8. Contraindication to MRI Imaging

9. Patients lacking capacity or unable to consent and non-English language speakers

10. Immediate modality switch after commencement on renal replacement therapy i.e. transplantation

11. Plan for treatment centre change/move outside of Imperial College Healthcare NHS Trust following commencement on renal replacement therapy

12. Patients currently participating in an active CTIMP trial

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

National Institute for Health Research, United Kingdom

OTHER_GOV

Sponsor Role: collaborator

Imperial College Healthcare NHS Trust

OTHER

Sponsor Role: collaborator

Imperial College London

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Neill Duncan, MBBS FRCP

Role: PRINCIPAL_INVESTIGATOR

Imperial College Healthcare NHS Trust

Locations

Imperial College Healthcare NHS Trust

London, , United Kingdom

Countries

United Kingdom

Other Identifiers

221424

Identifier Type: OTHER

Identifier Source: secondary_id

18HH4615

Identifier Type: -

Identifier Source: org_study_id