ABSTRACT
Objective:To compare the safety and effectiveness of endoscopic full-thickness resection (EFR) and cap-assisted endoscopic full-thickness resection (EFR-C) in the treatment of small gastric stromal tumors (≤1.5 cm) in the elderly (≥60 years old).Methods:Data of elderly patients with small gastric stromal tumors who received EFR (41 cases) or EFR-C (25 cases) at Nanjing Drum Tower Hospital from May 2012 to August 2020 were analyzed retrospectively. The clinicopathological characteristics, the procedures, intraoperative and postoperative complications, postoperative efficacy and economic benefits were compared between the two groups.Results:The R0 resection rates of the EFR group and the EFR-C group were 95.1% (39/41) and 100% (25/25), respectively. The operation time [45.0 (32.5, 66.5) min VS 30.0 (20.0, 42.5) min, U=259.500, P=0.001] and resection time [30.0 (20.0, 50.5) min VS 9.0 (6.5, 16.5) min, U=127.000, P<0.001] of the EFR group were significantly longer than those of the EFR-C group. The rate of hot clamp use in the EFR group was higher than that in the EFR-C group [75.6% (31/41) VS 12.0% (3/25), χ ２=25.159, P<0.001]. The postoperative white blood cell count [8.3 (6.6,10.4)×10 9/L VS 6.3 (5.0,7.7) ×10 9/L, U=271.000, P=0.001] and postoperative neutrophil percentage (77.6%±8.8% VS 73.0%±6.8%, t=2.256, P=0.027) in the EFR group were higher than those in the EFR-C group. The postoperative antibiotic day in the EFR group was longer than that in the EFR-C group (2.8±2.0 days VS 1.0±2.0 days, t=3.625, P=0.001). The hospitalization costs in the EFR group were significantly higher than those in the EFR-C group (20 595.0±3 653.3 yuan VS 13 209.0±4 458.9 yuan, t=7.323, P<0.001). There was no recurrence or metastasis during the follow-up period. Conclusion:EFR and EFR-C are safe and effective for the treatment of small gastric stromal tumors in the elderly. Compared with EFR, EFR-C needs shorter operation time and lower medical costs, yields less postoperative inflammation, and is more suitable for the treatment of small gastric stromal tumors in the elderly.
ABSTRACT
Objective: To study the structure property of a superfine melt blow(MF) non woven material for making medical masks and its filtering functions. Methods: Five kinds of masks were tested and they were: 20 layer gauze mask, cotton spunlace mask, MF outpatient mask, MF medical protective mask Ⅰ and MF medical protective mask Ⅱ. Scanning electron microscope was used to observe the structure of the filtering materials. The aperture of the materials was measured and the filtering efficacy was tested. Results: The diameter of MF fibers was less than 3 ?m and the material made from it was randomly distributed with multi curve channels and complex structure. The filtering efficacy of the new material was 96.2% 99.5% for ambient aerosol particles with a diameter of 0.3 ?m, while the efficacy of 20 layer gauze mask was 50.9%. As for respiratory resistance the former was 26 43 Pa and the later was 48 Pa. Besides, MF mask had good humid proof function and the character of electronic charge, and the later could help capture the particles. Conclusion: The new masks made from MF material has good filtering function and low respiratory resistance, which can be used to prevent SARS virus.