Journal Article

Pre-hypertension as a significant predictor of chronic kidney disease in a general population: the Ohasama Study

Atsuhiro Kanno, Masahiro Kikuya, Takayoshi Ohkubo, Takanao Hashimoto, Michihiro Satoh, Takuo Hirose, Taku Obara, Hirohito Metoki, Ryusuke Inoue, Kei Asayama, Yoh Shishido, Haruhisa Hoshi, Masaaki Nakayama, Kazuhito Totsune, Hiroshi Satoh, Hiroshi Sato and Yutaka Imai

in Nephrology Dialysis Transplantation

Published on behalf of European Renal Association - European Dialysis and Transplant Assoc

Volume 27, issue 8, pages 3218-3223
Published in print August 2012 | ISSN: 0931-0509
Published online April 2012 | e-ISSN: 1460-2385 | DOI: http://dx.doi.org/10.1093/ndt/gfs054
Pre-hypertension as a significant predictor of chronic kidney disease in a general population: the Ohasama Study

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Background

Hypertension is associated with an increased risk of development of chronic kidney disease (CKD). However, it is unclear whether pre-hypertension is related to the incidence of CKD.

Methods

The incidence of CKD defined as positive proteinuria or estimated glomerular filtration rate (eGFR) < 60 mL/min/1.73 m2 was examined in 2150 inhabitants without pre-existing CKD from the general Japanese population. The association of blood pressure and CKD incidence was examined using a Cox regression model adjusted for age, sex, habitual smoking and drinking, obesity, history of cardiovascular disease, diabetes mellitus or hypercholesterolemia, eGFR at baseline, number of follow-up examinations and year of baseline examination. Participants were categorized according to the Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation and Treatment of High Blood Pressure.

Results

Participants were categorized into normotension (n = 586, 27.3 % ), pre-hypertension (n = 815, 37.9 % ), Stage 1 hypertension (n = 386, 18.0 % ) and Stage 2 hypertension (n = 363, 16.9 % ). During a mean follow-up of 6.5 years (14 023 person-years), 461 incidences of CKD were recorded. Compared to normotension, adjusted hazard ratios of CKD were significantly higher for pre-hypertension (1.49, P < 0.003), Stage 1 (1.83, P < 0.001) and Stage 2 (2.55, P < 0.001) hypertension. The population-attributable fraction of pre-hypertension (12.1 % ) was considered to be compatible to that of Stage 1 (8.6 % ) and Stage 2 (14.9 % ) hypertension.

Conclusion

This was the first study to demonstrate that pre-hypertension was significantly associated with an increased risk of CKD and was one of the considerable causes of CKD in the general population.

Keywords: chronic kidney disease; epidemiology; population-attributable fraction; pre-hypertension; risk factors

Journal Article.  4162 words.  Illustrated.

Subjects: Nephrology

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