Objective To investigate the therapeutic effect of retrograde intrarenal surgery(RIRS)on patients with renal calculus(diameter≤2 cm)and its impact on renal function and inflammation.Methods From January 2020 to December 2022,194 patients with renal calculus(diameter≤2 cm)were divided into supermini percutaneous nephrolithotomy(SMP)group and RIRS group of 97 cases by random number talbe method.SMP group and RIRS group was treated with SMP and RIRS,all followed up for 1 week.Operation,renal function,stress response,inflammation-related indexes and complications were compared between the two groups.Results The time of indwelling of nephrostomy tube and hospital stay in RIRS groups were shorter than those in SMP groups,the intraoperative blood loss in RIRS groups was less than that in SMP group,the differences were statistically significant(P<0.05).The levels of serum cystatin C(Cys-C),serum creatinine(Scr)and unine neutrophil gelatinase-associated lipocalin(NGAL),kidney injury molecule-1(KIM-1)1 week after operation,and the serum reactive oxygen species(ROS),adrenaline(AD),noradrenaline(NA),adrenocorticotropic hormone(ACTH),lipid hydroperoxide(LPO),interleukin-6(IL-6),prostaglandin E2(PGE2)and hypersensitive C-reactive protein(hs-CRP)24 h after operation in the two groups were higher than those before surgery,and the RIRS group were lower(P<0.05).The overall complication rate during follow-up in the RIRS group was lower than that in SMP group(P<0.05).Conclusion Compared with SMP,RIRS in the treatment of renal calculus(diameter≤2 cm)has the advantages of less trauma,less bleeding,less renal damage,less postoperative stress,less inflammatory reaction and higher safety,which can promote postoperative recovery of patients.

Objective: To study the more safe and accurate guidance scheme of cone beam computed tomography (CBCT) in nasopharyngeal carcinoma. Methods: CBCT was regularly performed on 87 patients with nasopharyngeal carcinoma in Meizhou People's Hospital from November 2014 to August 2015. For each patient, 10 times CBCT scans were obtained pre-treatment. All the setup errors were obtained and analysed on the orientation X (left and right), Y (head and foot) and Z (vertical) axis. Results: With the increase of the number of CBCT scans, there was no statistically significant difference among the mean setup errors of the 10 times scans in X (left and right) and Y (head and foot) directions (all P > 0.05). And there was no statistically significant difference among the mean setup errors of 6 times scans in Z (vertical) direction, but from the beginning of the 7th, the systematic error in Z direction was increasing, the system error of the 7th, 8th, 9th, 10th time was 0.140, 0.292, 0.461, and 0.640 mm. Moreover, the difference of the mean systematic errors among the first 7 times was statistically significant (H = 15.232, P = 0.019), and the differences of the mean systematic errors among the first 8, 9 and 10 times were statistically significant (all P < 0.05). Conclusions Non-consecutive scans of CBCT could reduce the systematic and random errors. The appropriate frequency of application of CBCT based on the change law of setup errors is an ideal CBCT guidance scheme for nasopharyngeal carcinoma.

Objective To understand the spatial distribution characteristics of wild feces in schistosomiasis endemic areas of Jiangling County,Hubei Province and further explore the source of infection efficiently,so as to provide the evidence for the development of corresponding monitoring and response technology. Methods In 2011,the fresh wild feces were investigated every two months in the selected 15 villages by the severity of historical endemic in Jiangling County. The schistosome miracidi-um hatching method was used to test the schistosome infection of the wild feces. The descriptive analysis and spatial analysis were used for the description of the spatial distribution of the wild feces. Results Totally 701 wild feces samples were collected with the average density of 0.0556/100 m2,and the positive rate of the wild feces was 11.70%(82/701). The results of the re-gression analysis showed a positive spatial correlation between the positive rate of wild feces and the rate of human infection,the area with infected Oncomelania hupensis and the number of fenced cattle,and the corrected R2 of the model was 0.58. Conclu-sion The infection rate of wild feces is positively correlated with the rate of human infection,area with infected O. hupensis and number of fenced cattle in space in Jiangling County,so the prevention and control measures could be conducted according to the spatial distribution of the positive wild feces.

Objective To investigate the classiifcation, and reasonable choice and curative effect of the surgical procedures for pancreatic duct stone. Methods Clinical data of 18 patients with pancreatic duct stone undergoing surgery in Sun Yat-sen Memorial Hospital, Sun Yat-sen University from January 2010 to December 2012 were retrospectively analyzed. There were 13 males and 5 females with the average age of (53±12) years. Fourteen cases suffered from abdominal pain, 5 complicated with pancreatic cancer, 6 with bile duct stone and 8 with mellitus diabetes. The informed consents of all patients were obtained and the local ethical committee approval was received. Classiifcation, surgical procedures and postoperative complications of the pancreatic duct stone patients during perioperative period and the curative effect during follow-up were observed. Results All patients received surgical treatment. Two cases with typeⅠ pancreatic duct stone underwent pancreaticoduodenectomy (Whipple operation), 8 with type Ⅱand 1 with typeⅢunderwent pancreatolithotomy+pancreato-jejunal Roux-en-Y anastomosis (Partington operation). Two with typeⅢunderwent distal pancreatectomy+splenectomy. Among 5 cases with typeⅣ,2 underwent Whipple operation and 3 underwent Partington operation. No patients died during perioperative period. Postoperative complications were observed in 5 cases, including 3 with pancreatic ifstula and 2 with ascites, and the patients were cured after symptomatic treatments. Abdominal pain disappeared after surgery in 12 cases and was signiifcantly alleviated in 2 cases. One case complicated with pancreatic cancer died 1 year after surgery. No recurrence of stones was observed in the remaining cases. Conclusions Based on the priciple of individualized treatment, reasonable surgical procedure should be choosed according to the classiifcation of pancreatic duct stone. Pancreatolithotomy and pancreatojejunostomy are the main surgical procedures.

Objective To analyze set-up errors for irradiation of nasopharyngeal carcinoma by using kilo-voltage cone beam computed tomography (kV-KBCT) scanning, and to calculate the external margin from planning target volume (PTV) of nasopharyngeal carcinoma. Methods A total of 150 nasopharyngeal carcinoma patients in Meizhou People's Hospital from December 2014 to November 2016 were treated by image-guided radiation therapy (IGRT), kV-KBCT, CT image scanning matcthed by bone and grey alignment. PTV of nasopharyngeal carcinoma was also calculated. Results According to PTV formula, the external distance before radiotherapy guided by grey alignment was 0.5 mm in X-axis, 0.4 mm in Y-axis, 0.8 mm in Z-axis. While the distance was 0.1 mm in X-axis, 0.5 mm in Y-axis, 1.7 mm in Z-axis guided by bone alignment. After radiotherapy, the external distance guided by grey alignment was 0.4 mm in X-axis, 0.5 mm in Y-axis, 0.9 mm in Z-axis. While the distance was 0.1 mm in X-axis, 0.9 mm in Y-axis, 2.0 mm in Z-axis guided by bone alignment. There was no significant difference in set-up errors of 3 directions and 2 aligned ways before and after treatment.Conclusions The PTV within 3 mm is safe when IGRT is used for directing radiotherapy of nasopharyngeal carcinoma,and kV-KBCT is an effective image equipment.