A client who is taking furosemide reports experiencing leg cramps, a cough, feeling tired, and palpitations. Which action should the nurse take first?

A. Apply warm compresses to legs: While leg cramps can be uncomfortable, addressing them with warm compresses does not address the potential underlying issues related to the client's symptoms, especially considering the possibility of more severe conditions. B. Monitor intake and output: Monitoring intake and output is important in managing fluid balance, especially with diuretics like furosemide. However, this action does not directly address the immediate concerns raised by symptoms like palpitations and a cough. C. Raise the head of the bed: Raising the head of the bed can be helpful if the client is experiencing shortness of breath or orthopnea. However, it does not address the need to evaluate cardiac function, which is crucial given the presence of palpitations and other symptoms. D. Place on cardiac monitoring: The client's symptoms—palpitations, cough, fatigue—could indicate significant electrolyte imbalances or cardiac issues, which are common with furosemide use. Cardiac monitoring is the most appropriate initial action to quickly identify and address any cardiac complications.