Fig. 5From: The effect of tolvaptan on renal excretion of electrolytes and urea nitrogen in patients undergoing coronary artery bypass surgerySerial changes in BUN levels (upper) and FEUN (lower) in patients receiving conventional diuretics plus tolvaptan (black symbols and solid lines) or conventional diuretics only (white symbols and dotted lines). FEUN, fractional excretion of urea nitrogen; POD, postoperative dayBack to article page