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Am J Physiol Renal Physiol. 2018 Apr 1;314(4):F667-F674. doi: 10.1152/ajprenal.00400.2017. Epub 2017 Dec 13.

Hyperfiltration, urinary albumin excretion, and ambulatory blood pressure in adolescents with Type 1 diabetes mellitus.

Author information

1
Division of Endocrinology and Metabolism, Department of Medicine, Sunnybrook Health Sciences Centre, University of Toronoto , Toronto, Ontario , Canada.
2
Division of Nephrology, Department of Medicine, University Health Network, University of Toronto , Toronto, Ontario , Canada.
3
Division of Endocrinology, Department of Pediatrics, University of Colorado School of Medicine , Aurora, Colorado.
4
Department of Family and Community Medicine, University of Toronto , Toronto, Ontario , Canada.
5
Division of Endocrinology and Metabolism, Department of Pediatrics, Hospital for Sick Children, University of Toronto , Toronto, Ontario , Canada.
6
Department of Pediatrics, University of Cambridge , Cambridge , United Kingdom.

Abstract

Adolescents with Type 1 diabetes mellitus (T1DM) are at risk for hyperfiltration and elevated urinary albumin-to-creatinine ratio (ACR), which are early indicators of diabetic nephropathy. Adolescents with T1DM also develop early changes in blood pressure, cardiovascular structure, and function. Our aims were to define the relationships between hyperfiltration, ACR, and 24-h ambulatory blood pressure over time in adolescents with T1DM. Normotensive, normoalbuminuric adolescents ( n = 98) with T1DM underwent baseline and 2-yr 24-h ambulatory blood pressure monitoring, glomerular filtration rate (eGFR) estimated by cystatin C (Larsson equation), and ACR measurements. Linear regression models adjusted for diabetes duration, sex, and HbA1c were used to determine associations. Hyperfiltration (eGFR ≥ 133 ml/min) was present in 31% at baseline and 21% at 2-yr follow-up. Hyperfiltration was associated with greater odds of rapid GFR decline (>3 ml·min-1·yr-1) [OR: 5.33, 95%; CI: 1.87-15.17; P = 0.002] over 2 yr. Natural log of ACR at baseline was associated with greater odds of hyperfiltration (OR: 1.71, 95% CI: 1.00-2.92; P = 0.049) and 2-yr follow-up (OR: 2.14, 95%; CI: 1.09-4.19; P = 0.03). One SD increase in eGFR, but not ln ACR, at 2-yr follow-up conferred greater odds of nighttime nondipping pattern (OR: 1.96, 95% CI: 1.06-3.63; P = 0.03). Hyperfiltration was prevalent at baseline and at 2-yr follow-up, predicted rapid decline in GFR, and was related to ACR. Elevated GFR at 2-yr follow-up was associated with nighttime nondipping pattern. More work is needed to better understand early relationships between renal hemodynamic and systemic hemodynamic changes in adolescents with T1DM to reduce future cardiorenal complications.

KEYWORDS:

24-h ambulatory blood pressure; Type 1 diabetes; albumin-to-creatinine ratio; glomerular filtration rate; nephropathy

PMID:
29357443
PMCID:
PMC5966760
DOI:
10.1152/ajprenal.00400.2017
[Indexed for MEDLINE]
Free PMC Article

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