The aim of this study is to test the hypothesis that distal renal denervation (RDN) may delay or prevent the progressive decline of renal function in patients with type 2 diabetes mellitus and hypertension
Detailed Description: Diabetes mellitus and hypertension are two major causes of chronic kidney disease (CKD) that starts as subclinical decline in renal function that silently progresses to symptomatic advanced stages associated with irreversible significant damage of the kidney structure. Recent major improvements in pharmacotherapy of hypertension and diabetes have substantially reduced the prevalence of cardiovascular complications, yet, the frequency of CKD remains largely unchanged. Renal denervation is a new minimally invasive method to create regional blockade of the renal sympathetic nerves that is currently used as non-pharmacological therapy of hypertension. The CKD is likewise mediated by overactivity of renal sympathetic system so that RDN has strong potential to prevent development or progression of CKD. The new anatomically optimized distal RDN may have additional benefit in this regard. Denervation of the distal vessels involved in tonic regulation of renal blood should cause a significant drop in renal vascular resistance and proportional increase in blood and oxygen supply to the kidney preventing/reducing chronic hypoxia of renal tissue that is major mechanism of CKD. The aim of this study is to prove the aforementioned concept. For this purpose the eligible patients with type 2 diabetes mellitus and hypertension will undergo distal renal denervation performed using dedicated radiofrequency catheter Symplicity Spyral. The changes in the kidney function and structure as well as BPs (office and ambulatory) will be assessed at baseline, 6 and 12 months post-procedure
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
29
Bilateral radiofrequency renal denervation will be performed using Symplicity Spyral renal denervation system. Generally, at least two separate applications of radiofrequency energy will be performed in each segmental branch of renal artery. Each application will be done through 4 electrodes deployed in helical manner according to the design of the catheter
Cardiology Research Institute, Tomsk National Research Medical Centre, Russian Academy of Sciences
Tomsk, Russia
Change in estimated glomerular filtration rate renal function (eGFR)
eGFR calculated using CKD-EPI formula
Time frame: from baseline to 12 months
Change in eGFR
eGFR calculated using CKD-EPI formula
Time frame: from baseline 12 months
Change in office blood pressure levels (systolic/diastolic)
Blood pressure measurement performed by physician in office
Time frame: from baseline to 6 months and 12 months
Change in ambulatory 24-hour blood pressure levels (24-h mean, daytime, nighttime; systolic/diastolic)
Mean values for respective periods calculated from ambulatory blood pressure monitoring performed using automatic measurement device
Time frame: from baseline to 6 and 12 months
Change in cystatin C levels
blood analysis
Time frame: from baseline to 6 and 12 months
Change in lipocalin 2 (NGAL) levels
blood analysis
Time frame: from baseline to 6 and 12 months
Change in 24-hour urinary albumin excretion
urinalysis
Time frame: from baseline to 6 and 12 months
Change in the cortical and medullary volume of the kidneys and their ratio according to MRI
Cortical and medullary volume measured using magnetic resonance imaging
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Time frame: from baseline to 12 months
Prognostic significance of baseline HbA1c value with regard to change in eGFR
Will be assessed from multiple regression model of linear dependence of change in eGFR on a number of independent variables including in addition to HbA1c also age, sex, baseline eGFR, and 24-h ambulatory systolic BP
Time frame: from baseline to 6 and 12 months
Change in renal resistive index in a trunk
resistive index calculated using blood flow velocity on Doppler ultrasound
Time frame: from baseline to 6 and 12 months
Change in peak linear blood flow velocity in the trunk and in segmental renal arteries
blood flow velocity assessed by Doppler flowmetry in the trunk of the renal arteries and in segmental renal arteries using averaged values
Time frame: from baseline to 6 and 12 months