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Renal resistive index and mortality in chronic kidney disease.

ABSTRACT: Renal resistive index (RRI) measured by Doppler ultrasonography is associated with cardiovascular events and mortality in hypertensive, diabetic, and elderly patients. We studied the factors associated with high RRI (?0.70) and its associations with mortality in chronic kidney disease patients without renal artery stenosis. We included 1962 patients with an estimated glomerular filtration rate of 15 to 59 mL/min per 1.73 m(2) who also had RRI measured (January 1, 2005, to October 2011) from an existing chronic kidney disease registry. Participants with renal artery stenosis (60%-99% or renal artery occlusion) were excluded. Multivariable logistic regression model was used to study factors associated with high RRI (?0.70), and its association with mortality was studied using Kaplan-Meier plots and Cox proportional hazards model. Hypertension was prevalent in >90% of the patients. In the multivariable logistic regression, older age, female sex, diabetes mellitus, coronary artery disease, peripheral vascular disease, higher systolic blood pressure, and the use of ? blockers were associated with higher odds of having RRI?0.70. During a median follow-up of 2.2 years, 428 patients died. After adjusting for covariates, RRI?0.70 was associated with increased mortality (adjusted hazard ratio, 1.29; 95% confidence interval, 1.02-1.65; P<0.05). This association was more pronounced among younger patients and those with stage 3 chronic kidney disease. Noncardiovascular/non-malignancy-related deaths were higher in those with RRI?0.70. RRI?0.70 is associated with higher mortality in hypertensive chronic kidney disease patients without clinically significant renal artery stenosis after accounting for other significant risk factors. Its evaluation may allow early identification of those who are at risk thereby potentially preventing or delaying adverse outcomes.

SUBMITTER: Toledo C

PROVIDER: S-EPMC4498966 | biostudies-literature | 2015 Aug

REPOSITORIES: biostudies-literature

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Renal resistive index and mortality in chronic kidney disease.

Toledo Clarisse C Thomas George G Schold Jesse D JD Arrigain Susana S Gornik Heather L HL Nally Joseph V JV Navaneethan Sankar D SD

Hypertension (Dallas, Tex. : 1979) 20150615 2

Renal resistive index (RRI) measured by Doppler ultrasonography is associated with cardiovascular events and mortality in hypertensive, diabetic, and elderly patients. We studied the factors associated with high RRI (≥0.70) and its associations with mortality in chronic kidney disease patients without renal artery stenosis. We included 1962 patients with an estimated glomerular filtration rate of 15 to 59 mL/min per 1.73 m(2) who also had RRI measured (January 1, 2005, to October 2011) from an e ...[more]

PMID: 26077569

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Project description:BackgroundHigh ultrasound renal resistive index (RI) predicts poor cardiorenal outcomes in chronic kidney disease (CKD) and has recently emerged as a marker of nephroprotective drugs response. Thus, having a risk profile of CKD patients with abnormal RI may be relevant for the clinicians.MethodsConsecutive patients referred to our non-dialysis CKD clinic from 01/01/2016 to 01/12/2016, were evaluated by clinical and ultrasound analysis. Inclusion criteria were age >18 years and presence of CKD defined as estimated glomerular filtration rate (eGFR)<60 mL/min/1.73m2 and/or proteinuria>0.150g/24h. Renal artery stenosis, solitary kidney, acute kidney injury were the main exclusion criteria. RI value was the mean of three measures in segmental arteries in each kidney. Univariate analysis was performed to evaluate associations between continuous RI and clinical variables. Multivariate linear regression analysis, based on stepwise method with an elimination criterion of p<0.10, was used to assess the independent correlates of RI as continuous variable.ResultsWe studied 73 patients (69.9% men). Mean RI was 0.67±0.09. Frequencies of diabetes and cardiovascular disease (CVD) were 19.2% and 20.6% and median eGFR 54.1 [30.0-84.6] mL/min/1.73m2. From low (<0.65) to intermediate (0.65-0.70) to high (>0.70) RI categories, eGFR and haemoglobin levels were decreased while diabetes, cardiovascular disease (CVD), phosphate and smokers were higher. At univariate analysis, RI was significantly associated with age, presence of diabetes, CVD, serum phosphorus, eGFR, Urea and haemoglobin. Multi-adjusted stepwise regression analysis showed that lower eGFR levels (p<0.001), diabetes (p = 0.042), CVD (p = 0.009), smoking habit (p = 0.021) and higher serum phosphorus levels (p = 0.001) were associated with higher continuous RI. Serum phosphorus showed Area Under the Curves (AUC) values of 0.714 and 0.664 for discriminating RI cut-offs of 0.70 and 0.65.ConclusionsThis analysis suggests that RI is higher in CKD patients with CVD, diabetes, smoking habit and higher serum phosphorus, regardless of eGFR. Further studies are needed to verify whether higher RI indicates more complex pathway of intrarenal damage, besides and beyond kidney function.

Project description:BackgroundHypothyroidism and low free triiodothyronine (FT3) syndrome [low FT3 levels with normal thyroid-stimulating hormone (TSH)] have been associated with reduced kidney function cross-sectionally in chronic kidney disease (CKD) patients with severely reduced estimated glomerular filtration rate (eGFR) or end-stage kidney disease (ESKD). Results on the prospective effects of impaired thyroid function on renal events and mortality for patients with severely reduced eGFR or from population-based cohorts are conflicting. Here we evaluated the association between thyroid and kidney function with eGFR (cross-sectionally) as well as renal events and mortality (prospectively) in a large, prospective cohort of CKD patients with mild to moderately reduced kidney function.MethodsThyroid markers were measured among CKD patients from the German Chronic Kidney Disease study. Incident renal endpoints (combined ESKD, acute kidney injury and renal death) and all-cause mortality were abstracted from hospital records and death certificates. Time to first event analysis of complete data from baseline to the 4-year follow-up (median follow-up time 4.04 years) of 4600 patients was conducted. Multivariable linear regression and Cox proportional hazards models were fitted for single and combined continuous thyroid markers [TSH, free thyroxine (FT4), FT3] and thyroid status.ResultsCross-sectionally, the presence of low-FT3 syndrome showed a significant inverse association with eGFR and continuous FT3 levels alone showed a significant positive association with eGFR; in combination with FT4 and TSH, FT3 levels also showed a positive association and FT4 levels showed a negative association with eGFR. Prospectively, higher FT4 and lower FT3 levels were significantly associated with a higher risk of all-cause mortality (N events = 297). Per picomole per litre higher FT3 levels the risk of reaching the composite renal endpoint was 0.73-fold lower (95% confidence interval 0.65-0.82; N events = 615). Compared with euthyroid patients, patients with low-FT3 syndrome had a 2.2-fold higher risk and patients with hypothyroidism had a 1.6-fold higher risk of experiencing the composite renal endpoint.ConclusionsPatients with mild to moderate CKD suffering from thyroid function abnormalities are at an increased risk of adverse renal events and all-cause mortality over time.

Project description:ObjectiveTo compare mortality in chronic kidney disease (CKD) stages 4 and 5 (estimated glomerular filtration rate <30 mL/min/1.73 m(2)), peritoneal dialysis, haemodialysis and transplanted patients.DesignPopulation-based cohort study.SettingSwedish national healthcare system.ParticipantsSwedish adult patients with CKD stages 4 and 5 (n=3040; mean age 66 years), peritoneal dialysis (n=725; 60 years), haemodialysis (n=1791; 62 years) and renal transplantation (n=606; 48 years) were identified in Stockholm County clinical quality registers for renal disease between 1999 and 2010. Five general population controls were matched to each patient by age, sex and index year.ExposureCKD status (stage 4 or 5/peritoneal dialysis/haemodialysis/transplanted).Primary outcomeAll-cause mortality was ascertained from the Swedish Causes of Death Register. Mortality HRs were estimated using Cox regression conditioned on age, sex, diabetes status, education level and index year.ResultsDuring 6553 person-years, 766 patients with CKD stages 4 and 5 died (deaths/100 person-years 12, 95% CI 11 to 13) compared with 186 deaths during 1113 person-years in peritoneal dialysis (17, 95% CI 15 to 19), 924 deaths during 3680 person-years in haemodialysis (25, 95% CI 23 to 27) and 53 deaths during 2935 person-years in transplanted patients (1.8, 95% CI 1.4 to 2.4). Against matched general population controls, the mortality HR was 3.6 (95% CI 3.2 to 4.0) for CKD, 5.6 (95% CI 3.5 to 8.9) for transplanted patients, 9.2 (95% CI 6.6 to 12.7) for peritoneal dialysis and 12.6 (95% CI 10.8 to 14.6) for haemodialysis. In direct comparison versus CKD, the mortality HR was 1.7 (95% CI 1.4 to 2.1) for peritoneal dialysis, 2.6 (95% CI 2.3 to 2.9) for haemodialysis and 0.5 (95% CI 0.3 to 0.7) for transplanted patients.ConclusionsWe did not find support for mortality in CKD to be similar to dialysis mortality. The patients with CKD stages 4 and 5 had considerably lower mortality risk than dialysis patients, and considerably higher risk than transplanted patients and matched general population controls.

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Renal resistive index and mortality in chronic kidney disease.

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Renal resistive index and mortality in chronic kidney disease.

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