Non Diabetic Causes of Chronic Kidney Disease in Type 2 Diabetic Patients

August 24, 2021 updated by: Asmaa Nady Sayed, Assiut University
Determination of the possible causes of chronic kidney disease (CKD) in patients with type 2 diabetes mellitus with an atypical presentations of renal disease for proper management and thus improving renal outcome.

Study Overview

Status

Completed

Conditions

Detailed Description

Diabetes mellitus (DM) is one of the most important health problems worldwide, and its prevalence is increasing. One of the complications of DM is diabetic kidney disease (DKD), which is responsible for over 40% of cases of chronic kidney disease requiring dialysis or kidney transplantation in the Western world.

The natural history of DKD in patients with type 1 DM is well characterized because we know the precise time of DM onset. Classically, these patients develop microalbuminuria, followed by macroalbuminuria in the first 15 years of DM. After 20 years of DM, progressive loss of glomerular filtration rate (GFR) develops. The majority of these patients have diabetic retinopathy. However, the natural history of renal disease in adults with DM type 2 is controversial. Before diagnosis, type 2 DM has usually evolved over several years but has remained unnoticed.

In 2007, KDOQI guidelines described characteristics of diabetic patients that indicate DKD involvement, namely the presence of macroalbuminuria or microalbuminuria with diabetic retinopathy in both types of DM, and in type 1 DM patients, over 10 years of DM. In addition, the guidelines summarize the characteristics that suggest the presence of non-diabetic kidney disease (NDKD): absence of diabetic retinopathy, fast decline of renal function, fast increase in proteinuria or nephrotic syndrome, refractory hypertension, active urinary sediment or signs or symptoms of systemic disease or>30% reduction in GFR within 2-3 months after starting the blockade of the renin-angiotensin-aldosterone system (RAAS).Yuan 2017 addressed the accuracy of a clinical diagnosis of DKD among diabetic patients following the criteria proposed by the KDOQI guidelines. Around 20% of patients did not meet KDOQI criteria for DKD in type 2 DM, suggesting a significant over estimation of DKD in this population. This high proportion of NDKD matches previous publications which demonstrated that about a third of patients with DM have biopsy-proven NDKD. The gold standard for diagnosis is renal biopsy. Renal biopsy in diabetic patients has focused on identifying NDKD, because these patients have different prognosis and therapy. The most frequent biopsy indications in diabetic patients are nephrotic syndrome, nephrotic proteinuria in patients with < 5 years of DKD evolution, microhaematuria, acute kidney injury and unexplained decline of renal function. Several groups have studied renal biopsies from diabetic patients, showing that the most frequent NDKD diagnoses are IgA nephropathy, membranous nephropathy and focal segmental glomerulosclerosis.

Different studies have shown that patients with DKD have a worse renal prognosis and that the prevalence of NDKD is high in diabetic patients. Therefore, it is important to accurately classify diabetic patients for DKD or NDKD. Yuan 2017 studied the differential characteristics between patients meeting clinical criteria to diagnose DKD according to KDOQI and misclassified patients. They showed that those patients lacking KDOQI-predicted DKD were more likely to have an active urine sediment and less likely to have developed macroalbuminuria or retinopathy prior to end-stage renal disease. Using the logistic regression analysis, diabetic retinopathy was the only factor independently associated with patients who met KDOQI criteria.

Kidney biopsy studies in diabetic patients have found predictive factors for NDKD: absence of diabetic retinopathy, low glycosylated haemoglobin, worse renal function, lower level of proteinuria, the presence of microscopic haematuria, older age and shorter DM evolution. Although the Yuan 2017 cohort is small and the diagnostic method was usually not renal biopsy, the results are in line with prior reports. However, recent studies have shown that patients with biopsy-proven DKD may be normoalbuminuric. Thus, further studies with larger cohorts and ideally renal biopsy confirmation are necessary to find factors better predicting NDKD in type 2 diabetic patients. These studies may help to design novel diagnostic tools to be applied by physicians in daily clinical practice. New therapeutic agents for the treatment of DKD have recently been characterized. Endothelin receptor antagonists, sodium glucose co-transporter2 inhibitors, incretins and agents targeting inflammation/fibrosis are probably the most promising candidates on top of the classical RAAS blockers. Therefore, it is mandatory that patients with diabetic renal disease are adequately classified, differentiating clearly those with DKD and those with NDKD. In addition, among those with DKD, a reliable classification within different pathological categories will be of great value to individualize treatment strategies.

Study Type

Observational

Enrollment (Actual)

60

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

40 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Type 2 Diabetic patients

Description

Inclusion Criteria:

  • Patients with type 2 diabetes mellitus having proteinuria associated with macroscopic or microscopic haematuria.
  • Patients with type 2 diabetes mellitus with nephrotic syndrome appearing in the early stages of DM (less than 10 years of diagnosis) in absence of retinopathy or neuropathy.
  • Patients with type 2 diabetes mellitus with unexplained renal failure or rapidly progressive renal dysfunction within few weeks or months.
  • Patients with type 2 diabetes mellitus with symptoms and signs suggestive of systemic disease that may affect the kidney as SLE, vasculitis, multiple myeloma or lymphoma.
  • Patients with type 2 diabetes mellitus with rapidly progressive glomerulonephritis.

Exclusion Criteria:

  • Patients with type 1 diabetes mellitus.
  • DM with clinically, laboratory or radiologically evident CKD due to either chronic pyelonephritis, polycystic kidney disease or chronic obstructive nephropathy.
  • DM with end stage renal disease (ESRD) with bilateral small kidneys.
  • Patients with any contraindication to renal biopsy (systemic infections, bleeding tendency, low platelets, decrease prothrombin concentration).

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Case-Only
  • Time Perspectives: Cross-Sectional

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
renal biopsy
Time Frame: baseline
The preferred site for renal biopsy was the lateral aspect of the lower pole of the left kidney under ultrasound guidance with the patient in the prone position and local anesthesia was used. An automated biopsy gun and a 16 gauge needle was used to ensure the biopsy sample contained a minimum of ten glomeruli. After biopsy compression on site of biopsy was done and strict follow up for the patient to exclude any complications. No complications were occurred for any patients. Renal biopsy specimens were prepared according to standard methods for light microscopy and immunoperoxidase. Electron microscopy was not routinely performed.
baseline

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Assiut University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

January 1, 2016

Primary Completion (Actual)

September 1, 2019

Study Completion (Actual)

May 1, 2020

Study Registration Dates

First Submitted

August 19, 2021

First Submitted That Met QC Criteria

August 24, 2021

First Posted (Actual)

August 25, 2021

Study Record Updates

Last Update Posted (Actual)

August 25, 2021

Last Update Submitted That Met QC Criteria

August 24, 2021

Last Verified

August 1, 2021

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • Non diabetic kidney disease

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

No

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Diabetic Kidney Disease

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Pakistan

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

3
Subscribe