A client who is scheduled for a coronary arteriogram is admitted to the hospital on the day of the procedure. Which information is most important for the nurse to communicate to the provider before the procedure?

A. Client took metformin 500 mg by mouth this morning: Metformin must be withheld before and for 48 hours after procedures involving iodinated contrast dye, such as a coronary arteriogram. Contrast can impair renal function, increasing the risk of lactic acidosis in clients taking metformin. The provider must be notified immediately. B. Sinus bradycardia with a rate of 56 on the monitor: A heart rate of 56 bpm may be normal for some clients, especially those on beta-blockers. While it should be documented and monitored, it is not the priority concern prior to the procedure. C. Client reports chest pain that occurred yesterday: Chest pain history is relevant but expected in clients undergoing coronary arteriography. Pain that occurred yesterday and is not current is less urgent than the metformin issue. D. Blood glucose level 144 mg/dL: A glucose level of 144 mg/dL is mildly elevated but not critical in the context of this procedure. It does not pose the same immediate risk as contrast administration with recent metformin use.