Incident Type 2 Diabetes Among Individuals With CKD: Findings From the Chronic Renal Insufficiency Cohort (CRIC) Study.

Jepson C, Hsu JY, Fischer MJ, Kusek JW, Lash JP, Ricardo AC, Schelling JR, Feldman HI, Chronic Renal Insufficiency Cohort (CRIC) Study Investigators. Incident Type 2 Diabetes Among Individuals With CKD: Findings From the Chronic Renal Insufficiency Cohort (CRIC) Study. American journal of kidney diseases : the official journal of the National Kidney Foundation. 2019 Jan 1; 73(1):72-81.

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Abstract:

RATIONALE and OBJECTIVE: Few studies have examined incident type 2 diabetes mellitus (T2DM) in chronic kidney disease (CKD). Our objective was to examine rates of and risk factors for T2DM in CKD, using several alternative measures of glycemic control. STUDY DESIGN: Prospective cohort study. SETTING and PARTICIPANTS: 1,713 participants with reduced glomerular filtration rates and without diabetes at baseline, enrolled in the Chronic Renal Insufficiency Cohort (CRIC) Study. PREDICTORS: Measures of kidney function and damage, fasting blood glucose, hemoglobin A (HbA), HOMA-IR (homeostatic model assessment of insulin resistance), demographics, family history of diabetes mellitus (DM), smoking status, medication use, systolic blood pressure, triglyceride level, high-density lipoprotein cholesterol level, body mass index, and physical activity. OUTCOME: Incident T2DM (defined as fasting blood glucose  = 126mg/dL or prescription of insulin or oral hypoglycemic agents). ANALYTICAL APPROACH: Concordance between fasting blood glucose and HbA levels was assessed using ?. Cause-specific hazards modeling, treating death and end-stage kidney disease as competing events, was used to predict incident T2DM. RESULTS: Overall T2DM incidence rate was 17.81 cases/1,000 person-years. Concordance between fasting blood glucose and HbA levels was low (? for categorical versions of fasting blood glucose and HbA  = 13%). Unadjusted associations of measures of kidney function and damage with incident T2DM were nonsignificant (P  = 0.4). In multivariable models, T2DM was significantly associated with fasting blood glucose level (P  = 0.002) and family history of DM (P  = 0.03). The adjusted association of HOMA-IR with T2DM was comparable to that of fasting blood glucose level; the association of HbA level was nonsignificant (P  = 0.1). Harrell's C for the models ranged from 0.62 to 0.68. LIMITATIONS: Limited number of outcome events; predictors limited to measures taken at baseline. CONCLUSIONS: The T2DM incidence rate among individuals with CKD is markedly higher than in the general population, supporting the need for greater vigilance in this population. Measures of glycemic control and family history of DM were independently associated with incident T2DM.