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Research Article| Volume 367, P152-157, August 15, 2016

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A study of hyponatremia in tuberculous meningitis

      Highlights

      • Hyponatremia occurred in 45% of TBM patients.
      • Cerebral salt wasting was the commonest cause of hyponatremia.
      • Cerebral salt wasting was related to the severity of TBM.

      Abstract

      Setting

      In view of paucity of studies on predictors of hyponatremia in tuberculous meningitis (TBM) and its influence on outcome, this study was undertaken.

      Objective

      To study the frequency, predictors and prognosis of hyponatremia in TBM.

      Design

      In this prospective hospital based study, 76 patients with TBM (definite 18 and probable 58) were enrolled. The severity of meningitis was graded as I–III and hyponatremia as severe (<120 mEq/L), moderate (120–129 mEq/L) or mild (130–134 mEq/L). Hospital death was noted and functional outcome was assessed by modified Rankin Scale (mRS) on discharge.

      Results

      34 (44.7%) TBM patients had hyponatremia (mild 3, moderate 23 and severe 8). Hyponatremia was due to cerebral salt wasting in 17, syndrome of inappropriate secretion of antidiuretic hormone in 3 and miscellaneous causes in 14 patients. Hyponatremia was related to GCS score and basal exudates. Outcome of TBM was related to duration of hospitalization, GCS score, focal deficit, mechanical ventilation, severity of TBM, age and comorbidities. Cerebral salt wasting was related to severity of TBM.

      Conclusion

      Hyponatremia occurred in 44.7% of TBM patients. Cerebral salt wasting was the commonest cause of hyponatremia and was related to the severity of TBM.

      Keywords

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