Which laboratory finding is most concerning for a nurse caring for a client receiving Lisinopril for heart failure?

• A. Potassium of 6.0.
• B. Sodium of 150.
• C. Microalbuminuria.
• D. Elevated b-type natriuretic peptide (BNP).

Answer: (A)

A potassium level of 6.0 is particularly concerning for a nurse caring for a client receiving Lisinopril, which is an ACE inhibitor. This medication can cause hyperkalemia, which is an elevated level of potassium in the blood. Normal potassium levels typically range from 3.5 to 5.0 mEq/L, and a level of 6.0 mEq/L indicates a significant risk of cardiac complications, including arrhythmias.

Monitoring potassium levels is essential in patients on Lisinopril, as hyperkalemia can be life-threatening. Elevated potassium can lead to serious cardiovascular effects, making it imperative for the healthcare provider to take prompt action, such as adjusting the medication or initiating treatments to lower the potassium level.

The other laboratory findings, while important, do not present the same immediate danger. A sodium level of 150 indicates hypernatremia but is less acutely risky than hyperkalemia. Microalbuminuria suggests kidney involvement and may result from heart failure but does not require immediate intervention in the same manner. Elevated BNP levels can indicate heart failure worsening but do not pose an immediate risk like hyperkalemia does. Hence, the elevated potassium level is the most concerning laboratory finding in this context.