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Syndrome of inappropriate antidiuretic hormone secretion in patients with aquaporin-4 antibody

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Abstract

The objective of this study was to analyze the frequency of syndrome of inappropriate antidiuretic hormone secretion (SIADH) in patients with positive aquaporin-4 (AQP4) antibodies and evaluate the relationship between SIADH and hypothalamic lesions in patients with NMO and NMO spectrum disorder (NMOSD). AQP4 antibodies were tested by an indirect immunofluorescence assay employing HEK-293 cells transfected with recombinant human AQP4. Clinical data of patients were analyzed retrospectively. In total, 192 patients with AQP4 antibodies were certified, of which 41 patients (21.4 %) were included in the present study. Six patients (14.6 %, 6/41) met the criteria of SIADH, of which hyponatremia was mild in one patient, and severe in five. Five patients experienced confusion or decreased consciousness. Four patients were diagnosed with NMO and two were diagnosed with recurrent optic neuritis. Magnetic resonance imaging showed 11 of 41 patients (26.8 %) had hypothalamic lesions. All patients with SIADH had hypothalamic abnormalities. Hyponatremia resolved in all patients after intravenous methylprednisolone and intravenous immunoglobulin therapy. SIADH is not rare in patients with NMO/NMOSD, especially in patients with lesions close to the hypothalamus.

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Acknowledgments

This project was supported by Guangdong Natural Science Foundation (S2013010016262), the Science and Technology plan project of Guangdong Province (2012B031800240).

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The authors declare that no competing interests exist.

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Correspondence to Gao Cong.

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S. Pu and Y. Long are co-first authors.

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Pu, S., Long, Y., Yang, N. et al. Syndrome of inappropriate antidiuretic hormone secretion in patients with aquaporin-4 antibody. J Neurol 262, 101–107 (2015). https://doi.org/10.1007/s00415-014-7537-y

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  • DOI: https://doi.org/10.1007/s00415-014-7537-y

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