Although hyponatremia has been known to occur in patients with severe spinal cord injury with highly incidence, its mechanism has not been understood well. We examined a 64-year-old patient with severe hyponatremia after spinal cord injury by sequential measuring of the factors affecting water-electrolyte balance, such as antidiuretic hormone, renin, angiotensin II, atrial natriuretic peptide, and brain natriuretic peptide. The patient showed severe hypotension due to dysfunction of the sympathetic nerve.
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