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Obesity Surgery
Published in: Obesity Surgery 3/2013

01-03-2013 | Clinical Research

The Longer-Term Effects of Roux-en-Y Gastric Bypass Surgery on Sodium Excretion

Authors: Funda Celik, Mohamed Ahdi, Eelco W. Meesters, Arnold van de Laar, Dees P. M. Brandjes, Victor E. A. Gerdes

Published in: Obesity Surgery | Issue 3/2013

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Abstract

Background

Obesity is an independent risk factor for hypertension and chronic kidney disease. During the first months after bariatric surgery, an improvement of sodium excretion has been described. The aim of this work was to study the influence of bariatric surgery on sodium excretion at more than a year after the intervention.

Methods

Patients who have undergone Roux-en-Y gastric bypass (RYGB) and who had collected a 24-h urine sample before surgery more than 12 months ago were asked to participate. A second 24-h urine sample was collected. Blood pressure and weight were measured. The difference in sodium excretion before and after surgery was calculated, and the relationship with blood pressure and weight loss was investigated.

Results

We included 33 patients; the median follow-up time was 21 months (range 14–41). Sodium excretion was high before surgery (median 195 mmol/day, IQR range 167–247) and decreased by 18 % after surgery (median 160 mmol/day, IQR range 118–205, p = 0.015), while there were significant improvements in body weight (% EWL 80.9 ± 21.8), systolic blood pressure (126 to 120 mmHg, p = 0.02), and diastolic blood pressure (84 to 77 mmHg, p = 0.002), even with a reduced number of antihypertensive drugs.

Conclusions

After RYGB and considerable weight loss, sodium excretion remains high in the longer term. The profound improvement in blood pressure cannot be explained by reductions in sodium excretion after RYGB.
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Metadata
Title
The Longer-Term Effects of Roux-en-Y Gastric Bypass Surgery on Sodium Excretion
Authors
Funda Celik
Mohamed Ahdi
Eelco W. Meesters
Arnold van de Laar
Dees P. M. Brandjes
Victor E. A. Gerdes
Publication date
01-03-2013
Publisher
Springer-Verlag
Published in
Obesity Surgery / Issue 3/2013
Print ISSN: 0960-8923
Electronic ISSN: 1708-0428
DOI
https://doi.org/10.1007/s11695-012-0764-3

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