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    What causes low sodium levels after knee replacement surgery?

Posted on Thu, 27 Jul 2017 in Kidney Conditions
Question: Hi,

I would like to know your opinion on below case

My father has got knee replacement surgery 2 weeks ago. After surgery we can observe that sodium levels are dropping. The next day after surgery sodium is 134. After two days it went to 128. From then we started sodamint - 2 tablets for every 6 hours. So Sodium level increased to 129.9 and then 133.9 within 4 days of using sodamint. But after 3 more days it dropped to 131.5 in spite of taking sodamint.

Can yout please tell why sodium levels are dropping. What would be the treatment for That?
Isort it because of the surgery? How to cure this? Other than blood reports there are no physical symptoms. B.P is normal. He is not diabetic. No alcohol.
Answered by Dr. Raju A.T 9 hours later
Brief Answer:
Need some more details

Detailed Answer:

Thanks for your query.

Sorry for late reply.

I would like to know

What were the sodium levels pre surgery ?
Is he a hypertensive ?
What are his creatinine levels ?
How is his frequency of urination ?

Waiting for your response,

Above answer was peer-reviewed by : Dr. Raju A.T
Follow up: Dr. Raju A.T 52 minutes later

It was 140.20 before surgery . He is not hypertensive and there are no symptoms.

Creatinine level is 0.97 . Creatinine looks to be okay . Even TSH is fine

Answered by Dr. Raju A.T 45 hours later
Brief Answer:
Could be diuretics

Detailed Answer:

Thanks for the info.

Sorry for the delayed response.

Low sodium levels in a post op patient could most probably be due to medications used during anesthesia.

Most suspected amongst them could be diuretics. DIuretics can cause hyponatremia.

Even minor amount of blood loss can also cause low sodium levels.

Need not worry as it is easily treatable.

Please do ask if any doubts.


Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
Follow up: Dr. Raju A.T 14 hours later
Hi, I have provided some attachments. Please review them.
Answered by Dr. Raju A.T 6 hours later
Brief Answer:

Detailed Answer:

I have seen the reports. All three readings are normal.

Above answer was peer-reviewed by : Dr. Raju A.T
Answered by
Dr. Raju A.T

General & Family Physician

Practicing since :2008

Answered : 4035 Questions


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