Objective:To analyse the clinical characteristics of 214 cases of paediatric high altitude pulmonary edema（HAPE）and the efficacy of dexamethasone in adjunctive therapy.Methods:This retrospective study analyzed 214 pediatric cases of HAPE admitted to the Department of Paediatrics of the General Hospital of Tibetan Military between June 2015 to June 2017 and June 2019 to June 2021.Patients were divided into dexamethasone-treated group and dexamethasone-untreated group.Baseline data，clinical characteristics were collected to evaluate the treatment efficacy and drug side effects.Results:There were 107 children in each of the two groups with a median age of 8（5，11）years. The median age of the dexamethasone-treated group was 9（6，12）years and the mean age of the dexamethasone-untreated group was 7（3，10）years. The proportion of male children was 69.60%（149/214）；the onset of illness was mostly concentrated within 72 hours，accounting for 97.20%（208/214）of the cases；83.18%（178/214）of the cases had symptoms of combined upper respiratory tract infection before entering the plateau. The most important clinical symptoms of the children were cough（86.92%，186/214），cyanosis（70.09%，150/214），and shortness of breath（66.36%，142/214）. The proportion of auscultatory rhonchi was 83.18%（178/214），and all cases showed positive findings on chest radiography. After the dexamethasone regimen，the overall cure rate of the children was 94.39%，the average disappearance time of the symptoms and signs was（40.52±7.85）h，and the average hospital stay was（3.60±1.90）d. After treatment with the dexamethasone-free regimen，the overall cure rate was 92.52%，the mean time to disappearance of symptoms and signs was（42.10±7.62）h，and the mean length of stay in the hospital was(3.84±2.08)d. There was no significant difference in the cure rate，the disappearance time of symptoms and signs，and the average hospitalisation days between the two groups（ P>0.05），but a total of 11 children in the dexamethasone-treated group experienced adverse drug reactions，and no children in the dexamethasone-untreated group experienced adverse drug reactions. Conclusion:Han Chinese male children，particularly those with upper respiratory infections，should be closely monitored for HAPE risk within three days of ascending to high altitudes. This study does not recommend the use of dexamethasone for pediatric HAPE due to the lack of therapeutic benefits and potential adverse effects.

Objective:To analyse the clinical characteristics of 214 cases of paediatric high altitude pulmonary edema（HAPE）and the efficacy of dexamethasone in adjunctive therapy.Methods:This retrospective study analyzed 214 pediatric cases of HAPE admitted to the Department of Paediatrics of the General Hospital of Tibetan Military between June 2015 to June 2017 and June 2019 to June 2021.Patients were divided into dexamethasone-treated group and dexamethasone-untreated group.Baseline data，clinical characteristics were collected to evaluate the treatment efficacy and drug side effects.Results:There were 107 children in each of the two groups with a median age of 8（5，11）years. The median age of the dexamethasone-treated group was 9（6，12）years and the mean age of the dexamethasone-untreated group was 7（3，10）years. The proportion of male children was 69.60%（149/214）；the onset of illness was mostly concentrated within 72 hours，accounting for 97.20%（208/214）of the cases；83.18%（178/214）of the cases had symptoms of combined upper respiratory tract infection before entering the plateau. The most important clinical symptoms of the children were cough（86.92%，186/214），cyanosis（70.09%，150/214），and shortness of breath（66.36%，142/214）. The proportion of auscultatory rhonchi was 83.18%（178/214），and all cases showed positive findings on chest radiography. After the dexamethasone regimen，the overall cure rate of the children was 94.39%，the average disappearance time of the symptoms and signs was（40.52±7.85）h，and the average hospital stay was（3.60±1.90）d. After treatment with the dexamethasone-free regimen，the overall cure rate was 92.52%，the mean time to disappearance of symptoms and signs was（42.10±7.62）h，and the mean length of stay in the hospital was(3.84±2.08)d. There was no significant difference in the cure rate，the disappearance time of symptoms and signs，and the average hospitalisation days between the two groups（ P>0.05），but a total of 11 children in the dexamethasone-treated group experienced adverse drug reactions，and no children in the dexamethasone-untreated group experienced adverse drug reactions. Conclusion:Han Chinese male children，particularly those with upper respiratory infections，should be closely monitored for HAPE risk within three days of ascending to high altitudes. This study does not recommend the use of dexamethasone for pediatric HAPE due to the lack of therapeutic benefits and potential adverse effects.

Objective:To investigate the short-term efficacy of laparoscopic surgery after short-course radiotherapy followed by sequential chemotherapy combined with anti-programmed death-1 (PD-1) antibody therapy for locally advanced rectal cancer.Methods:The prospective study was conducted. The clinicopathological data of 30 locally advanced rectal cancer patients who were admitted to the Union Hospital of Tongji Medical College of Huazhong University of Science and Technology from November 2019 to September 2020 were selected. Patients underwent laparos-copic surgery after short-course radiotherapy followed by sequential chemotherapy combined with anti-PD-1 antibody therapy. Observation indicators: (1) situations of the enrolled patients; (2) situations of short-course radiotherapy followed by sequential chemotherapy combined with anti-PD-1 antibody therapy and adverse events; (3) preoperative evaluation and surgical situations; (4) postoperative situations and pathological examinations; (5) postoperative adjuvant chemo-therapy and follow-up. Follow-up was conducted using outpatient examination and telephone interview up to March 2022. Patients were followed up once every 3 weeks during the period of short-course radiotherapy followed by sequential chemotherapy combined with anti-PD-1 antibody therapy to detect the adverse events and patients were followed up once every 3 months during the first postoperative 2 years and once every 6 months thereafter to detect tumor recurrence and survival of patients. Measurement data with normal distribution were represented as Mean± SD, and measurement data with skewed distribution were represented as M(range). Count data were described as absolute numbers or percentages. The Kaplan-Meier method was used to calculate survival rates and draw survival curves. Results:(1) Situations of the enrolled patients. A total of 30 patients were selected for eligibility. There were 17 males and 13 females, aged (57±16)years. Cases with preoperative primary tumor in stage cT3 and cT4 were 22 and 8, respectively. Cases with preoperative clinical lymph node metastasis in stage cN0, cN1, cN2 were 4, 16, 10, respectively. Cases in preoperative clinical stage Ⅱ and Ⅲ were 4 and 26, respectively. Of the 30 patients, there were 21 cases with positive circumferential margin and 12 cases with vascular invasion in extramural of rectum in the preoperative imaging evaluation. Distance from the distal margin of tumor to anal margin and tumor diameter of the 30 patients were 4.7(range, 1.9?9.0)cm and 5.4(range, 2.1?10.0)cm, respectively. There were 28 cases with mismatch repair proficient and 1 case with mismatch repair deficiency in tumor tissues. There was 1 case missing the data of mismatch repair in tumor tissues as failed in biopsy of pathological examination before the treatment. (2) Situations of short-course radiotherapy followed by sequential chemotherapy combined with anti-PD-1 antibody therapy and adverse events. All the 30 patients completed preoperative short-course radiotherapy successfully. Of the 30 patients, there were 3 cases not undergoing the sequential chemotherapy combined with anti-PD-1 antibody therapy and there were 24 cases undergoing 2 courses of the sequential chemotherapy combined with anti-PD-1 antibody therapy and 3 cases undergoing 1 course of the sequential chemotherapy combined with anti-PD-1 antibody therapy. The time interval between ending of radiotherapy and starting of chemotherapy combined with anti-PD-1 antibody therapy of the 27 patients was 12(range, 4?18) days. Cases with leukopenia, cases with endothelial hyperplasia of skin capillaries, cases with radiation proctitis, cases with anemia, cases with peripheral neurotoxicity, cases with neutropenia, cases with thrombocytopenia, cases with fatigue, cases with anorexia, cases with abnormal liver function, cases with hypothyroidism were 24, 22, 21,20, 18, 16, 16, 13, 10, 9, 2 in the 30 patients during the preoperative short-course radiotherapy followed by sequential chemotherapy combined with anti-PD-1 antibody therapy. Cases with the above adverse events were improved after symptomatic treatment. (3) Preoperative evaluation and surgical situations. Seven of the 30 patients were in clinical complete remission after preoperative multidisciplinary evaluation and the other 23 patients were not in clinical complete remission. Twenty-seven of the 30 patients underwent laparoscopic radical resection of rectal cancer and 3 patients not undergoing the sequential chemotherapy combined with anti-PD-1 antibody therapy did not undergo surgery. The time interval between ending of chemotherapy combined with anti-PD-1 antibody therapy and the surgery of the 27 patients were 14(range, 5?141)days. Of the 27 cases, there were 13 cases and 14 cases with 0 and 1 of the preoperative Eastern Cooperative Oncology Group score, respectively, and there were 24 cases undergoing low anterior proctectomy and 3 cases undergoing abdominoperineal excision. The operation time and volume of intra-operative blood loss of the 27 cases were (182±36)minutes and 30(range, 10?150)mL, respectively. Of the 27 cases, there were 16 cases with protective ileostomy and 24 cases with anal preservation. (4) Postoperative situations and pathological examinations. The time to postoperative first flatus, time to postoperative initial liquid food intake and duration of postoperative hospital stay of the 27 patients undergoing surgery were 2(range, 1?4)days, 3(range, 2?5)days and 8(range, 7?16)days, respectively. Five of the 27 patients had postoperative grade Ⅰ?Ⅱ complications, including 2 cases with incision infection, 1 case with abdominal infection, 1 case with incision hemorrhage and 1 case with venous thrombosis in left lower limb intermuscular. Cases with postoperative complica-tions were improved after symptomatic treatment. Results of postoperative pathological examina-tion showed that the rate of pathologic complete response in 27 patients was 48.1%(13/27). Of the 27 cases, cases in grade 0, grade 1, grade 2, grade 3 of the tumor regression grading were 13, 5, 7, 2, respectively, cases in stage T0, stage Tis, stage T2, stage T3 of the tumor T staging were 13, 1, 5, 8, respectively, cases in stage N0, stage N1, stage N2 of the tumor N staging were 19, 6, 2, respectively, cases in stage 0, stage Ⅰ, stage Ⅱ, stage Ⅲ of the tumor TNM staging were 14, 0, 5, 8, respectively. The number of lymph node dissected of the 27 patients was 15(range, 3?29). Of the 27 patients, there was 1 case with positive circumferential margin and 26 cases achieving R 0 resection. None of the 27 patients underwent secondary operation or perioperative death. (5) Postoperative adjuvant chemotherapy and follow-up. Of the 27 patients undergoing surgery, 21 cases underwent post-operative adjuvant chemotherapy, with the cycles of 4(range, 1?6). All the 27 patients were followed up for 20(range, 20?29)months. During the follow-up, 3 cases not achieving pathological complete response had tumor recurrence and no patient died. The disease free survival rate of the 27 patients was 88.9%. Conclusion:Laparoscopic surgery after short-course radiotherapy followed by sequential chemotherapy combined with immunotherapy for locally advanced rectal cancer is safe and feasible, with satisfied short-term efficacy.