Robotic Central Pancreatectomy with Pancreaticojejunostomy for Solid Pseudopapillary Neoplasm

PURPOSE: Minimally invasive central pancreatectomy has rarely performed because of its technical difficulty. Robot system enhances surgical dexterity to perform such complex procedures. METHODS: A 29-year-old woman was admitted with acute cholecystitis and an 1.4 cm enhancing mass was incidentally found at the pancreatic proximal body on computed tomography. Preoperative image studies suggested a neuroendocrine tumor or solid pseudopapillary neoplasm. The patient underwent robotic cholecystectomy and central pancreatectomy with pancreaticojejunostomy. RESULTS: The total operation time was 280 minutes and the estimated amount of intraoperative bleeding was 100 ml. The postoperative recovery was uneventful and she was discharged on the 7(th) postoperative day. Pathologic examination reported a solid pseudopapillary neoplasm. CONCLUSION: The technical difficulties associated with the procedure can be overcome with the help of the wrist-like movement of the robotic instruments, especially for the preservation of splenic vessels and for creating precise anastomoses in narrow spaces.

Self-Nanoemulsifying Drug Delivery System of Lutein: Physicochemical Properties and Effect on Bioavailability of Warfarin

Objective of present study was to prepare and characterize self-nanoemulsifying drug delivery system (SNEDDS) of lutein and to evaluate its effect on bioavailability of warfarin. The SNEDDS was prepared using an oil, a surfactant, and co-surfactants with optimal composition based on pseudo-ternary phase diagram. Effect of the SNEDDS on the bioavailability of warfarin was performed using Sprague Dawley rats. Lutein was successfully formulated as SNEDDS for immediate self-emulsification and dissolution by using combination of Peceol as oil, Labrasol as surfactant, and Transcutol-HP or Lutrol-E400 as co-surfactant. Almost complete dissolution was achieved after 15 min while lutein was not detectable from the lutein powder or intra-capsule content of a commercial formulation. SNEDDS formulation of lutein affected bioavailability of warfarin, showing about 10% increase in Cmax and AUC of the drug in rats while lutein as non-SNEDDS did not alter these parameters. Although exact mechanism is not yet elucidated, it appears that surfactant and co-surfactant used for SNEDDS formulation caused disturbance in the anatomy of small intestinal microvilli, leading to permeability change of the mucosal membrane. Based on this finding, it is suggested that drugs with narrow therapeutic range such as warfarin be administered with caution to avoid undesirable drug interaction due to large amount of surfactants contained in SNEDDS.