Grant K. Ghahramani, MD; Alison E. Seline, BA; Karolyn A. Wanat, MD
A man in his 70s with a history of recent CABG surgery presented with blue, tender plantar macules on several toes and red, tender macules on his hands. Laboratory findings included a BUN level of 70 mg/dL, serum creatinine level of 6.1 mg/dL, and peripheral eosinophilia. What would you do next?