1. A 57-year-old m an com plained of a tingling sensation in his hands and peripheral edem a. The m an, w ho had received a heart transplant 1 m onth earlier, was in the hospital and scheduled for...

1. A 57-year-old m an com plained of a tingling sensation in his hands and peripheral edem a. The m an, w ho had received a heart transplant 1 m onth earlier, was in the hospital and scheduled for endomyocardial biopsy. Signi cant blood test results were potassium 6.1 m Eq/L (norm al 3.5-5.0 m Eq/L), creatinine 3.8 m g/dL (norm al 0.6-1.2 m g/dL), blood urea nitrogen (BUN) 42 m g/dL (norm al 7-18 m g/dL). Current m edications were cyclosporine, prednisone, and azathioprine to prevent rejection, om eprazole for heartburn, and diltiazem for arrhythm ia. Biopsy results indicated no acute rejection. If the laboratory results were drug-related, w hich of the follow ing was the m ost likely causative agent? A. Prednisone B. Cyclosporine C. Azathioprine D. Om eprazole E. Diltiazem