Can heart valve medicines cause high potassium levels?

Question

Hello doctor,

I am reaching out on behalf of my 78-year-old father, who was diagnosed with heart valve disease late last year. Following the necessary tests, the cardiologist prescribed the following medications:

Empagliflozin 10 mg daily.
Bisoprolol 2.5 mg daily.
Torsemide 10 mg daily.
Aldactone 25 mg daily.

He had been taking these medications regularly. However, last month he developed anorexia and fatigue. I ordered an electrolyte check, which showed the following results:

Potassium (K+): 6.5 mEq/L.
Sodium (Na⁺) high.
Bicarbonate is high.
Urea: 122 mg/dL.
Creatinine 2.1 mg/dL.

Because of these findings, I temporarily stopped the medications. After one week, the tests were repeated, and the results showed:

Urea decreased to 118 mg/dL.
Creatinine decreased to 1.98 mg/dL.

For the emergency treatment of hyperkalemia, he was given IV insulin and dextrose, followed by Calcium polystyrene sulfonate powder at the hospital.

Unfortunately, he will not be able to see his cardiologist for another two weeks. In the meantime, the fatigue, ascites, and pedal edema are still persisting.

Kindly advise on what can be done for him pending his cardiology appointment.

Please help.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I have gone through your query and understand your concern.

I am sorry to hear about your father. His situation is concerning because a potassium level of 6.5 mEq/L, along with elevated urea and creatinine levels, suggests significant kidney impairment and dangerous hyperkalemia, which can become life-threatening by causing serious heart rhythm disturbances.

Medications such as Spironolactone, Torsemide, and Empagliflozin are commonly used in heart failure and valve disease, but in elderly patients with worsening kidney function, they may require dose adjustment or temporary interruption under medical supervision.

However, stopping all heart failure medications completely can also worsen fluid overload, which may explain his persistent ascites, pedal edema, fatigue, and likely ongoing congestion.

At this stage, waiting two weeks without reassessment may not be ideal, especially because he still has edema and fatigue after a recent severe electrolyte disturbance.

He should ideally be reviewed sooner by a physician, cardiologist, or nephrologist for repeat renal function tests, potassium levels, ECG (electrocardiogram), blood pressure, oxygen saturation, and fluid assessment.

Persistent fluid retention may require careful reintroduction or adjustment of diuretics, but this must be balanced against kidney function and potassium levels. Avoid restarting Spironolactone until the potassium level is clearly normalized and a doctor reassesses him, because it can significantly raise potassium further.

Monitor his daily weight, urine output, breathing status, swelling, and blood pressure if possible. Restrict high-potassium foods such as bananas, oranges, coconut water, potatoes, tomatoes, and salt substitutes containing potassium. Excess fluid and salt intake should also be limited if he has worsening edema or ascites.

If he develops worsening shortness of breath.
Chest pain.
Confusion.
Severe weakness.
Reduced urine output.
Palpitations.
Drowsiness.

He should go to the emergency department immediately because recurrent hyperkalemia or worsening heart failure may be occurring.

His elevated bicarbonate level may also indicate metabolic alkalosis, often related to diuretics or dehydration, while the elevated sodium level could reflect volume imbalance. The combination of heart disease, kidney dysfunction, and electrolyte abnormalities in elderly patients requires very close monitoring because small medication changes can significantly affect both the heart and kidneys.

A repeat echocardiogram and reassessment of the severity of his valve disease may also eventually be necessary if his symptoms continue worsening despite treatment.

Overall, the immediate priorities are preventing recurrent hyperkalemia, controlling fluid overload safely, and reassessing kidney function sooner rather than later. Given the complexity of cardiorenal syndrome in elderly heart failure patients, an earlier medical review rather than waiting the full two weeks would be the safest course.

I hope I have answered your question.

Let me know if I can assist you further.

Thank you.