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Aim: Serum creatinine level is the most used test to evaluate renal function in patients with anorexia nervosa (AN). We investigated which formula of glomerular filtration rate (GFR) based on simple blood sample had the best correlation with the gold standard in malnourished adolescent patients with AN., Methods: A prospective study was conducted on 34 adolescents hospitalized for the restrictive type of AN between 2014 and 2017. The GFR was measured by isotopic technique and calculated using the Cockroft-Gault, Schwartz equations and 3 other formula., Results: For the 34 AN patients, mean BMI -2.7 zscore, the mean measured GFR was 107+/-26 mL/min/1.73 m 2 . Among them, 35% (12/34) had a GFR under 90 mL/min/1.73 m 2 . The calculated GFR with Cockroft-Gault formula had the best correlation with the measured GFR (R2 = 0.852), whatever the creatinine level. No correlation was found between creatinine level and measured GFR., Conclusion: Kidney dysfunction is common in malnourished AN adolescents, so clinicians should always evaluate AN patients for renal impairments. Creatinine level is a poor indicator of renal function in this population. The most accurate formula to test GFR with a simple blood test is the Cockroft-Gault formula., (Copyright © 2019 Elsevier Ltd and European Society for Clinical Nutrition and Metabolism. All rights reserved.)

Purpose: Although primarily a mental health disorder, anorexia nervosa (AN) has many physical consequences. Among them, the consequences on kidney function are often underestimated. We evaluated renal function in adolescent AN inpatients and investigated the correlation between the GFR and intrinsic patient characteristics., Methods: A single-center retrospective study was conducted on 51 patients hospitalized for the restrictive type of AN in 2013. Data were divided into: (1) medical history of AN; (2) growth parameters and vital signs upon admission; and (3) blood tests. The glomerular filtration rate (GFR) was calculated using the Cockroft-Gault, MAYO Clinical Quadratic (MCQ), Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI), the Modification of Diet in Renal Disease (MDRD), and Schwartz equations., Results: The calculated percentages of patients with a GFR below 90 mL/min/1.73 m 2 according to the different equations were as follows: Cockroft-Gault, 45%; MDRD, 28%; CKD-EPI, 14%; MCQ, 12%, and Schwartz, 4%. There was a strong association between the body mass index (BMI) and the GFR according to all equations (p < 0.0001). The lowest heart rate was significantly associated with a reduced GFR according to the Cockroft-Gault equation (p = 0.03). The GFR values did not differ significantly after rehydration., Conclusion: Clinicians should evaluate AN patients for renal complications, especially when the BMI and heart rate are very low. Dehydration was not solely responsible for renal impairment., Level of Evidence: Level III, single-center retrospective cohort study.

Preterm birth incurs a higher risk for adult cardiovascular diseases, including hypertension. Because preterm birth may impact nephrogenesis, study objectives were to assess renal size and function of adults born preterm versus full term and to examine their relationship with blood pressure (BP; 24-hour ambulatory BP monitoring) and circulating renin-Ang (angiotensin) system peptides. The study included 92 young adults born (1987-1997) preterm (≤29 weeks of gestation) and term (n=92) matched for age, sex, and race. Young adults born preterm had smaller kidneys (80±17 versus 90±18 cm 3 /m 2 ; P<0.001), higher urine albumin-to-creatinine ratio (0.70; interquartile range, 0.47-1.14 versus 0.58, interquartile range 0.42 to 0.78 mg/mmol, P=0.007), higher 24-hour systolic (121±9 versus 116±8 mm Hg; P=0.001) and diastolic (69±5 versus 66±6 mm Hg; P=0.004) BP, but similar estimated glomerular filtration rate. BP was inversely correlated with kidney size in preterm participants. Plasma Ang I was higher in preterm versus term participants (36.3; interquartile range, 13.2-62.3 versus 19.4; interquartile range, 9.9-28.1 pg/mL; P<0.001). There was no group difference in renin, Ang II, Ang (1-7), and alamandine. In the preterm, but not in the term group, higher BP was significantly associated with higher renin and alamandine and lower birth weight and gestational age with smaller adult kidney size. Young adults born preterm have smaller kidneys, higher urine albumin-to-creatinine ratio, higher BP, and higher circulating Ang I levels compared with term controls. Preterm young adults with smaller kidneys have higher BP. Clinical Trial Registration- URL: http://www.clinicaltrials.gov . Unique identifier: NCT03261609.