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What Causes Low Potassium Levels?

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Posted on Thu, 16 Apr 2015
Question: Critically low potassium. Was down to 1.9 but now almost normal taking 80 MEQ potassium a day. Enlarged spleen. Slightly low RBC's and slightly elevated WBC's. CT Scan also showed kidney stones, but they are not blocking anything. One blood test "The XXXXXXX Renin Ratio is elevated but Aldosterone itself is not significantly
elevated. " CT scan showed adrenals are normal.
Unknown etiology on spleen. I'm just hoping for other ideas. The low potassium issue has been going on for several years.
doctor
Answered by Dr. Binu Parameswaran Pillai (1 hour later)
Brief Answer:
Low potassium levels.

Detailed Answer:
Good day,
Noted your concerns.
There are number of reasons why Potassium can be low.
I must say that Potassium has to be corrected before checking Aldosterone, otherwise, aldosterone values tend to be false. Again posture of the patient is important when we check Aldosterone.

What is the renin levels?

We need to do a 24 hour urine potassium and creatinine.. This will give a clue if you are losing potassium in urine or elsewhere.

Cushing's syndrome is yet another cause of low potassium. And there are some renal tubule defects which can cause low potassium and magnesium ( GITTLEMAN Syndrome).

What about Magnesium and bicarbonate levels? Any tests done ??

It is important to visit an Endocrinologist to further investigate his condition.

Spleen may need to be investigated separately by a hematologist.

Regards
Binu

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Binu Parameswaran Pillai (22 hours later)
no bicarbonate tests done
Current potassium is at 3.5.
CREATININE      0.5      mg/dL (blood/substance)
CREATININE      2090      mg/24hr (urine)
SODIUM       414      mmol/24hr
ALDOSTERONE      14.33      ug/24 hr
MAGNESIUM      1.87      mg/d

July 2014 when potassium at 3.5
ALDOSTERONE      15.6      ng/dL      
ALDOSTERONE/RENIN      >104.0     
RENIN      <0.15      ng/mL/hr


May 2014 when potassium at 2.9
ALDOSTERONE      10.8      ng/dL      
ALDOSTERONE/RENIN      45.0           
RENIN      0.24      ng/mL/hr           
doctor
Answered by Dr. Binu Parameswaran Pillai (42 minutes later)
Brief Answer:
Suggestive of Primary hyperaldosterinism

Detailed Answer:
July 2014 when potassium at 3.5
ALDOSTERONE 15.6 ng/dL
ALDOSTERONE/RENIN >104.0
RENIN <0.15 ng/mL/hr

The above values shows low normal Potassium. Aldosterone is elevated and Renin is suppressed and Aldo/Renin ratio is elevated. This is quite suggestive of primary hyperaldosteronism. DID YOU MEET AN ENDORINOLOGIST ??

The next step would be a confirmatory test like Saline Loading test. This will guide further evaluation.

How is your blood pressure?? Are you on any medications?


Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Binu Parameswaran Pillai (26 hours later)
A nephrologist was consulted. But the medical plan I go through dropped the ball on the consult. None of my results had been forwarded to him since July 2014.
I thought I had mentioned meds. High blood pressure for a years now. Three different meds. Taken off of hctz when the potassium issue started. Still on Lisinopril, atenolol and amlodipine besylate.
I'll bring up the Saline Loading Test. I really appreciate your responses. Thank you.
doctor
Answered by Dr. Binu Parameswaran Pillai (12 minutes later)
Brief Answer:
Aldactone

Detailed Answer:
Thanks for the reply. Once we complete saline loading test, please demand ( if your doc doesn't wilfully refer you ) for an endocrine consultation. This is no more a nephrologists Job now. You need an expert endocrine follow up.
Besides , once you ccomplete saline loading, you need to be started on Aldactone as an anti hypertensive agent. That would successfully bring up your potassium levels as well as will treat hypertension effectively.
Note: For more detailed guidance, please consult an Internal Medicine Specialist, with your latest reports. Click here..

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
Answered by
Dr.
Dr. Binu Parameswaran Pillai

Endocrinologist

Practicing since :2003

Answered : 1438 Questions

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What Causes Low Potassium Levels?

Brief Answer: Low potassium levels. Detailed Answer: Good day, Noted your concerns. There are number of reasons why Potassium can be low. I must say that Potassium has to be corrected before checking Aldosterone, otherwise, aldosterone values tend to be false. Again posture of the patient is important when we check Aldosterone. What is the renin levels? We need to do a 24 hour urine potassium and creatinine.. This will give a clue if you are losing potassium in urine or elsewhere. Cushing's syndrome is yet another cause of low potassium. And there are some renal tubule defects which can cause low potassium and magnesium ( GITTLEMAN Syndrome). What about Magnesium and bicarbonate levels? Any tests done ?? It is important to visit an Endocrinologist to further investigate his condition. Spleen may need to be investigated separately by a hematologist. Regards Binu