Subclinical renal tubular acidosis in patients with primary and secondary Sjögren's syndrome: a possible marker of disease progression |
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Authors: | S. Nishinarita S. Kinoshita M. Kaneko T. Shimizu K. Son M. Aoki N. Kitamura Y. Matsukawa M. Hiranuma T. Horie |
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Affiliation: | (1) Department of Internal Medicine, Nihon University School of Medicine, 30 Oyaguchi, Itabashi-ku, Tokyo 173-8610, Japan Tel. +81-3-3972-8111 (ext. 2402); Fax +81-3-3972-2893 e-mail: nishis@med.nihon-u.ac.jp, JP;(2) Internal Medicine, Municipal Akiru General Hospital, Tokyo, Japan, JP |
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Abstract: | To clarify the prevalence of subclinical renal tubular acidosis (RTA) and its association with clinical and laboratory parameters in primary and secondary Sjögren's syndrome (SS), an acid-loading test was conducted. Subclinical RTA was found in 32% of patients with SS. The prevalence of subclinical RTA in primary and secondary SS was about the same (31.6% and 33.3%, respectively). Significant longer duration of illness, more severely decreased salivary excretion, decreased lymphocyte number, higher serum levels of IgG and IgA, and higher frequency of anti-SS-A (Ro) and SS-B (La) antibodies were found in patients with subclinical RTA. These results suggested that subclinical RTA may be a characteristic manifestation both in primary and secondary SS, along with the progression of immunologic dysfunction, when the illness seemed to be indolent. |
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Keywords: | Extraglandular involvement Renal tubular acidosis (RTA) Sj?gren's syndrome (SS) |
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