Final answer:
The nurse should assess the electrolyte potassium, in a hypertensive client on diuretics complaining of muscle weakness and falls, as diuretics can lead to hypokalemia, affecting muscle function.
Step-by-step explanation:
The 50-year-old client with hypertension who is being treated with a diuretic and complains of muscle weakness and falls easily should be assessed for potassium levels. Diuretics, especially those affecting the loop of Henle, often inhibit the reabsorption of sodium and chloride, which can lead to the secondary excretion of potassium, potentially causing hypokalemia. Hypokalemia can cause muscle weakness and increase the risk of falls due to its role in maintaining the normal function of muscle cells, including skeletal muscles.