Journal
CLINICAL JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY
Volume 14, Issue 6, Pages 854-861Publisher
AMER SOC NEPHROLOGY
DOI: 10.2215/CJN.14831218
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Funding
- Division of Diabetes Endocrinology and Metabolic Diseases of the National Institute of Diabetes and Digestive and Kidney Disease [U01 DK094176, U01 DK094157]
- National Eye Institute
- National Institute of Neurologic Disorders and Stroke
- General Clinical Research Centers Program (1993-2007)
- Clinical Translational Science Center Program (2006-present), Bethesda, Maryland
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
- NIDDKD, National Institutes of Health (NIH)
- US Government
- NIDDK
- NIH
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Background and objectives Glomerular hyperfiltration has been considered to be a contributing factor to the development of diabetic kidney disease (DKD). To address this issue, we analyzed GFR follow-up data on participants with type 1 diabetes undergoing 125I-iothalamate clearance on entry into the Diabetes Control and Complications Trial (DCCT)/Epidemiology of Diabetes Interventions and Complications study. Design, setting, participants, & measurements Thiswas a cohort study of DCCT participants with type 1 diabetes whounderwent an 125I-iothalamate clearance (iGFR) atDCCTbaseline. Presence of hyperfiltrationwas defined as iGFR levels $ 140 ml/min per 1.73 m2, with secondary thresholds of 130 or 150 ml/min per 1.73 m2. Cox proportional hazards models assessed the association between the baseline hyperfiltration status and the subsequent risk of reaching an eGFR,60 ml/min per 1.73 m2. Results Of the 446 participants, 106 (24%) had hyperfiltration (iGFR levels $ 140ml/min per 1.73 m2) at baseline. Over amedian follow-up of 28 (interquartile range, 23, 33) years, 53 developed an eGFR, 60 ml/min per 1.73m2. The cumulative incidence ofeGFR, 60 ml/min per 1.73m2 at 28 years of follow-upwas 11.0% among participants with hyperfiltration at baseline, compared with 12.8% among participants with baseline GFR,140 ml/min per 1.73m2. Hyperfiltrationwas not significantly associated with subsequent risk of developing an eGFR, 60 ml/min per 1.73 m2 in an unadjusted Cox proportional hazards model (hazard ratio, 0.83; 95% confidence interval, 0.43 to 1.62) nor in an adjustedmodel (hazard ratio, 0.77; 95% confidence interval, 0.38 to 1.54). Application of alternate thresholds to define hyperfiltration (130 or 150 ml/min per 1.73 m2) showed similar findings. ConclusionsEarlyhyperfiltrationinpatientswithtype 1 diabeteswasnot associatedwithahigher long-termriskof decreased GFR. Although glomerular hypertension may be a mechanism of kidney injury in DKD, higher total GFR does not appear to be a risk factor for advanced DKD.
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