The nurse assesses a client with intermittent claudication who is receiving pentoxifylline. Which assessment should the nurse perform to determine the effectiveness of the medication?

A. Monitor numeric pain scale: Pentoxifylline improves blood flow by decreasing blood viscosity, which can reduce ischemic pain associated with intermittent claudication. Monitoring pain intensity helps evaluate medication effectiveness. B. Evaluate level of consciousness: Changes in consciousness are not related to pentoxifylline therapy or intermittent claudication and do not indicate medication effectiveness. C. Auscultate bowel sounds: Bowel sounds are not affected by pentoxifylline, nor are they relevant to assessing treatment of peripheral vascular symptoms. D. Measure hourly urinary output: Urinary output is not impacted by pentoxifylline and does not reflect improvement in peripheral circulation or symptom relief in intermittent claudication.