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High salt intake promotes a decline in renal function in hypertensive patients: a 10-year observational study.
MedLine Citation:
PMID:  23051657     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We investigated the influence of long-term salt load on renal function in hypertensive patients. The subjects were 133 hypertensive patients (80 women and 53 men, mean age 60±9 years) who underwent at least five successful 24 h home urine collections during the 10-year observation period. Blood pressure (BP) and 24-h urinary salt and creatinine excretion levels were measured. BP decreased from 143±12/85±8 to 129±14/68±11 mm Hg during the 10.5-year observation period, and this decrease was associated with patients taking an increased number of antihypertensive drugs (1.3±1.0 to 2.2±1.1). The estimated glomerular filtration rate (eGFR) also significantly decreased from 71.7±14.6 to 64.7±16.5 ml min(-1) (P<0.01), and the change in eGFR was -0.68 ml min(-1) per year on average. The average salt excretion was 8.6±2.2 g per day and showed a significant negative correlation with the change in eGFR (r=-0.21, P=0.02). Subjects with an average salt excretion<8 g per day showed a significantly slower decline in renal function than those with an average salt excretion 8 g per day (the change in eGFR: -0.41±1.10 vs. -0.83±1.19 ml min(-1) per year, P<0.05). In the multivariate analysis, the average salt excretion (partial r=-0.19, P=0.03) and baseline eGFR (partial r=-0.23, P=0.01) were significantly associated with the change in eGFR. This association was independent of BP change or an increased number of antihypertensive drugs. The results suggest that long-term salt load promotes a decline in renal function in hypertensive patients; thus, salt restriction is encouraged, to prevent renal damage.Hypertension Research advance online publication, 11 October 2012; doi:10.1038/hr.2012.155.
Authors:
Yuko Ohta; Takuya Tsuchihashi; Kanako Kiyohara; Hideyuki Oniki
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-11
Journal Detail:
Title:  Hypertension research : official journal of the Japanese Society of Hypertension     Volume:  -     ISSN:  1348-4214     ISO Abbreviation:  Hypertens. Res.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9307690     Medline TA:  Hypertens Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1] Department of Internal Medicine, Fukuoka Dental College Medical and Dental Hospital, Fukuoka, Japan [2] Division of Hypertension, Clinical Research Institute, National Kyushu Medical Center, Fukuoka, Japan.
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