The nurse is caring for a client newly prescribed a nonsteroidal anti-inflammatory drug. Which clinical finding is most concerning?

A. History of constipation: Constipation is not directly affected by NSAID therapy. While bowel habits should be monitored, a history of constipation does not increase the risk of serious NSAID-related complications. It is not the most urgent concern. B. Client takes the medication with food: Taking NSAIDs with food is recommended to reduce gastrointestinal irritation and ulcer risk. This practice is protective rather than concerning. C. Diagnosis of heart failure: NSAIDs can cause sodium and water retention, increasing blood pressure and exacerbating heart failure. They also reduce renal prostaglandin-mediated perfusion, raising the risk of worsening cardiac function and fluid overload. This makes heart failure the most concerning finding when initiating NSAID therapy. D. Painful joints throughout the day: Persistent joint pain is an indication for NSAID use rather than an adverse risk factor. While pain assessment is important, it does not pose an immediate safety concern.