Clinical efficacy of pancreaticoduodenectomy using artery first approach and prior portal vein-superior mesenteric vein shunting and reconstruction for complicated pancreatic head tumors

Objective To investigate the clinical efficacy of pancreaticoduodenectomy using artery first approach and prior portal vein (PV)-superior mesenteric vein (SMV) shunting for complicated pancreatic head tumors. Methods The retrospective cohort study was conducted. The clinicopathological data of 91 patients with pancreatic head cancer who were admitted to the Changhai Hospital of Navy Medical University from February 2011 to December 2016 were collected. Among 91 patients undergoing pancreaticoduodenectomy combined with vascular resection and reconstruction, 27 using artery first approach and PV-SMV shunting and reconstruction were allocated into the PD-PVR group, 23 using conventional approach were allocated into the PD-CVR group, and 41 receiving pancreaticoduodenectomy with vascular resection were allocated into the PD-SVR group. Observation indicators: (1) comparison of intra- and post-operative situations among groups; (2) comparison of postoperative pathological results among groups; (3) comparison of postoperative survival among groups. Follow-up using outpatient examination and telephone interview was performed to detect postoperative survival up to December 2017. Comparisons among groups of count data were done by the chi-square test or Fisher exact probability. Measurement data with normal distribution were represented as ±s, comparisons among groups were analyzed using the ANOVA, and pairwise comparison was done using the LSD method. Measurement data with skewed distribution were described as M(Q), comparison among groups was analyzed using the Kurskal-Wallis rank sum test, and pairwise comparison was done using the paired comparison with adjusted P value. Ordinal data were compared using the nonparametric test. The survival rate and curve were respectively calculated and drawn by the Kaplan-Meier method, and Log-rank test was used for survival analysis. Results (1) Comparison of intra- and post-operative situations among groups: operation time, time of hepatic inflow occlusion, volume of intraoperative blood loss, cases with intraoperative blood transfusion, length of PV or SMV removal , cases with vascular grafts, grading 1, 2, 3, 4 and 5 of Clavien-Dindo classification of postoperative complications and duration of hospital stay were respectively (274±36)minutes, (22±7)minutes, 1 661 mL (110 mL, 3 800 mL), 20, (5.6±1.4)cm, 6, 11, 1, 1, 1, 1, (20±7)days in the PD-PVR group and (281±41)minutes, (27±5)minutes, 1 888 mL (176 mL, 4 162 mL), 18, (5.4±1.5) cm, 3, 1, 8, 2, 0, 0, (21±7)days in the PD-CVR group and (201±36)minutes, (16±6)minutes, 1 052 mL (74 mL, 3 926 mL), 17, (3.2±2.0)cm, 5, 15, 2, 3, 1, 1, (13±6)days in the PD-SVR group, with statistically significant differences among groups (F=37.060, 34.530, χ2=13.771, 14.015, F=32.260, χ2=39.309, F=19.880, P 0.05). (3) Comparisons of postoperative survival among groups: of 91 patients, 52 were followed up for 3.0-69.3 months, with a median time of 18.0 months and follow-up rate of 57.1%(52/91), including 16 in the PD-PVR group and 14 in the PD-CVR group and 22 in the PD-SVR group. The median survival time, 1-, 2- and 3-year overall survival rates in 52 patients were respectively 16.6 months, 63.5%, 35.7% and 26.8%. The survival time in the PD-PVR, PD-CVR and PD-SVR groups were respectively 12.3 months (3.9-69.3 months), 15.0 months (3.0-63.3 months) and 20.0 months (6.0-65.2 months), with a statistically significant difference in survival among groups (χ2=6.201, P 0.05). Conclusion Pancreaticoduodenectomy using artery first approach and PV-SMV shunting and reconstruction for complicated pancreatic head tumors can reduce the time of hepatic inflow occlusion, it also contributes to the risk control of surgery for complicated pancreatic tumors, increases surgical safety and improves patients′ prognosis. Key words: Pancreatic neoplasms; Complex pancreatic neoplasms; Pancreatic head neoplasms; Artery first approach; Prior portal vein-superior mesenteric vein shunting; Pancreaticoduodenectomy; Complications; Prognosis