Cause of Hyponatraemia

She has undergone TKR, and was discharged from hospital undergoing recovery at home on antibiotics, other medicines when a steady weakness was detected in her. When admitted she was diagnosed with dyselectrolytemia, hyponatremia with sodium levels as low as 105. What could be the reason for the sudden loss sodium levels even when she came in a perfectly fit condition post OP and can it happen again ? Also her short term memory shows signs of loss, is this reversible?
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Harisha N L
General Physician 3 yrs exp Bangalore

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Hi there I understand your concern...Postoperative hyponatraemia is provoked by surgical stress, which causes a syndrome of inappropriate antidiuretic hormone in almost everyone, often promoting water retention for several days resulting in hyponatremia...and hyponatremia associated with brain dysfunction and cognitive aspects...hence memory issues may be due to that...good luck.
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