A client with heart failure (HF) returns to the clinic two weeks after adjustments were made to the prescribed cardiac glycoside, diuretic, and potassium supplement. The client's lungs are clear, heart rate is 58 beats/minute, and serum potassium level is 2.9 mEq/L (2.9 mmol/L). Which action is most important for the nurse to implement? Reference Range: Potassium (K+) [3.5 to 5.0mEq/L (3.5 to 5.0 mmol/L)]

A. While weight monitoring is important for heart failure management, it's not the priority in this situation. The low potassium level is a more immediate concern. B. The serum potassium level of 2.9 mEq/L is significantly below the normal range and indicates hypokalemia. Hypokalemia can lead to serious cardiac arrhythmias, especially in patients taking cardiac glycosides. This is a critical finding that requires immediate attention from the healthcare provider. C. Dietary intake can contribute to potassium levels, but it's not the most urgent action at this time. D. Assessing for edema is important for monitoring heart failure status, but it's not the priority when there's a critical electrolyte imbalance.