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  • Title: [CT and 123I-IMP SPECT findings of head injuries with hyponatremia].
    Author: Morinaga K, Hayashi S, Matsumoto Y, Omiya N, Mikami J, Ueda M, Sato H, Inoue Y, Okawara S.
    Journal: No To Shinkei; 1991 Sep; 43(9):891-4. PubMed ID: 1742097.
    Abstract:
    CT and SPECT findings were examined and the relationship between development of hyponatremia and lesions was studied in cases who developed hyponatremia following head injury. Six cases of hyponatremia after head injury in the last two years were used as the subjects. SPECT was performed by the 123I-IMP intravenous injection method using Tomomatic 64. Slice 2 of 4 to 6 cm on the OM line in the early image was used as the subject site. The data of development of hyponatremia was 5.8 patients days, duration 9.2 days, minimum serum Na level 117.2 mEq/l and minimum plasma osmotic pressure 247.6 mOsm/lH2O. CT findings in the hyponatremic stage showed frontal subdural effusion in all the cases. SPECT findings revealed a decrease of CBF in the frontal region on both sides and in the central region. CBF in the central region also tended to improve at a time when hyponatremia improved. In hyponatremia after head injury, lesions are often found in the frontal region on CT, and CBF in the central region is also decreased bilaterally on SPECT, which is presumed to be concerned with the development of hyponatremia.
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