USE OF TC-99M DIETHYLENETRIAMINEPENTAACETIC ACID GALACTOSYL HUMAN SERUM-ALBUMIN LIVER SCINTIGRAPHY IN THE EVALUATION OF PREOPERATIVE AND POSTOPERATIVE HEPATIC FUNCTIONAL RESERVE FOR HEPATECTOMY

Background. Technetium 99m diethylenetriaminepentaacetic acid-galactosyl-human serum albumin (Tc-99m-GSA) is a new liver scintigraphy agent that binds to the asialoglycoprotein receptors. We evaluated the clinical use of Tc-99m-GSA for the perioperative assessment of hepatectomy. Methods. Thirty-six patients with hepatocellular carcinoma were admitted for elective hepatectomy. Tc-99m-GSA scintigraphy was obtained after the intravenous injection of Tc-99m-GSA, and a modified receptor index (MRI) was calculated. Tc-99m-GSA scintigraphy, conventional liver function, the plasma disappearance rate, and the 15-minute retention rate of indocyanine green (ICGR15) were carried out before operation and every 1 to 3 months after operation. The relationships between several systemic hemodynamic parameters, histologic activity index (HAI), plasma disappearance rate, and ICGR15 or MRI values were estimated. Results. A significant correlation was obtained between the MRI and ICGR15 (r = 0.6231, p < 0.001). Plasma disappearance rates correlated well with systolic volume and left cardiac work, whereas MRI values did not correlate with these systemic hemodynamics. Preoperative discrepancies between the values of MRI and ICGR15 were seen in eight cases. In these cases the MRI values correlated well with HAI score (p < 0.05) but there was not significant correlation between ICGR15 values and the HAI scores. Conclusions. These results suggested the use of Tc-99m-GSA scintigraphy as a easy and reliable method for determining liver functional reserve.