A client with chronic renal failure has a serum potassium level of 6.8 mEq/L. What should the nurse assess first?

A client with chronic renal failure has a serum potassium level of 6.8 mEq/L. What should the nurse assess first?

• A. Cardiac Rhythm
• B. Respiratory Rate
• C. Muscle Strength
• D. Skin Turgor

Answer: (A)

The key issue here is the danger hyperkalemia poses to the heart. With a potassium level as high as 6.8 mEq/L, the most immediate threat is life‑threatening cardiac conduction disturbances that can lead to sudden death. Therefore, the first thing to assess is the heart’s rhythm. By checking the ECG, you can detect dangerous changes early—such as tall peaked T waves, PR prolongation, widened QRS complexes, or even more severe sine‑wave patterns—and act promptly to stabilize the myocardium and guide urgent treatment. Respiratory rate, muscle strength, and skin turgor are important in overall assessment, but they do not convey the immediate risk to life as directly as cardiac rhythm in severe hyperkalemia.

The key issue here is the danger hyperkalemia poses to the heart. With a potassium level as high as 6.8 mEq/L, the most immediate threat is life‑threatening cardiac conduction disturbances that can lead to sudden death. Therefore, the first thing to assess is the heart’s rhythm. By checking the ECG, you can detect dangerous changes early—such as tall peaked T waves, PR prolongation, widened QRS complexes, or even more severe sine‑wave patterns—and act promptly to stabilize the myocardium and guide urgent treatment.

Respiratory rate, muscle strength, and skin turgor are important in overall assessment, but they do not convey the immediate risk to life as directly as cardiac rhythm in severe hyperkalemia.