68Ga-DOTATATE/18F-FDG two-day low-dose total-body PET/CT imaging is increasingly employed to facilitate the diagnosis,prognosis,and heterogeneity assessment of neuroendocrine neoplasms.We present a consensus on operational guideline for a two-day combined imaging from experts in low-dose/ultra-low-dose total-body PET/CT from several domestic medical institutions.

Objective:To investigate the clinical utility of 68Ga-labeled fibroblast activation protein inhibitor (FAPI) PET/CT in the detection of primary and metastatic gastric signet-ring cell carcinoma (GSRCC) and compared the results with those of 18F-FDG PET/CT. Methods:A total of 21 patients (10 males, 11 females, average age 52 years) with primary and metastatic GSRCC who underwent 68Ga-FAPI and 18F-FDG PET/CT at the First Affiliated Hospital of Xiamen University from June 2020 to May 2022 were retrospectively analyzed. Pathological results of surgery and (or) biopsy were used as the " gold standard" for final diagnosis. In cases whose surgery or tissue biopsies were not available, clinical and radiographic follow-up results were used as the reference standards. Wilcoxon signed-rank test was used to compare the SUV max of 18F-FDG and 68Ga-FAPI. McNemar χ2 test was used to compare the detection rate between 18F-FDG and 68Ga-FAPI PET/CT. Results:68Ga-FAPI PET/CT showed higher SUV max than 18F-FDG in primary tumors (5.3(2.4, 15.7) vs 2.4(1.8, 2.5); z=2.31, P=0.021), local recurrences (7.8(6.0, 8.9) vs 2.4(1.9, 3.4); z=2.20, P=0.028), lymph nodes metastases (7.7(4.5, 12.2) vs 2.4(1.9, 3.6); z=6.01, P<0.001) and bone/visceral metastases (6.7(5.3, 11.1) vs 2.4(2.0, 3.4); z=11.36, P<0.001). Regarding diagnostic accuracy, 68Ga-FAPI PET/CT showed higher sensitivities than 18F-FDG for primary tumors (7/9 vs 2/9; χ2=3.20, P=0.063) and local recurrences (7/7 vs 2/7; χ2=3.20, P=0.063). It also demonstrated higher lesion detection rates than 18F-FDG for suspicious lymph node metastases (86%(65/76) vs 32%(24/76); χ2=31.37, P<0.001) and bone/visceral metastases (99%(184/185) vs 39%(73/185); χ2=107.08, P<0.001). Conclusions:68Ga-FAPI PET/CT showed higher tumor uptake and lesion detection rate than 18F-FDG in the primary and metastatic GSRCC. 68Ga-FAPI PET/CT demonstrates good diagnostic performance for tumor detection, staging, and restaging of GSRCC, which is helpful to further guide clinical treatment strategy.

Objective:To develop a tetramer probe targeting fibroblast activation protein (FAP), named 1, 4, 7, 10-tetraazacyclododecane-1, 4, 7, 10-tetraacetic acid (DOTA)-4P(FAP inhibitor (FAPI)) 4, evaluate its biodistribution and PET image in FAP-positive-tumor bearing nude mice, and explore its feasibility as a novel radio-regent for treatment of FAP-positive tumor. Methods:FAP tetramer probe was constructed on the FAPI-46 motif with four mini-polyethylene glycol (PEG)(PEG 3) spacers between the four FAPI motifs, denoted as 4P(FAPI) 4. DOTA was used as the chelator for radiolabeling with 68Ga and 177Lu. The FAP binding characteristics were test by in vitro cell competitive binding experiment. Small-animal PET, in vivo biodistribution, and radionuclide targeting therapy were performed in HT-1080-FAP tumor bearing nude mice ( n=39). Independent-sample t test was performed to analyze tumor uptake data, and two-factor repeated measures analysis of variance was utilized to compare tumor volume data in radioactive isotope therapy. Results:Cell experiment showed that FAPI-tetramer and FAPI-monomer had similar half maximal inhibitory concentration values (3.29 and 2.15 nmol/L). 68Ga/ 177Lu radiolabeled FAPI-tetramer had better tumor uptake and retention than FAPI-monomer in small-animal PET and in vivo biodistribution experiment, with the tumor uptake for 177Lu-DOTA-4P(FAPI) 4 and 177Lu-FAPI-46 at 48 h of (18.72±1.32) vs (2.72±1.20) percentage activity of injection dose per gram of tissue (%ID/g) ( t=15.55, P<0.001). 177Lu-DOTA-4P(FAPI) 4 group showed best anti-tumor efficacy compared with 177Lu-FAPI-46 and control group in radionuclide targeting therapy. On the 2nd day after the start of treatment, the tumor volume in the tetramer treatment group was significantly smaller than that in the control group (mean difference 67.19 mm 3, P=0.049); on the 14th day after the start of treatment, the tumor volume in the tetramer treatment group was significantly smaller than that in the monomer treatment group (mean difference 414.33 mm 3, P=0.005). Conclusion:FAPI-tetramer can improve tumor uptake and retention ability compared with FAPI-46, and 177Lu-DOTA-4P(FAPI) 4 can be a promising radio-agent for FAP-positive tumor therapy.

Extracorporeal membrane oxygenation (ECMO) is a technique in which breathing and circulation are supported extracorporeally. Severe trauma may induce cardiopulmonary failure, for which ECMO can play an adjunctive role in the salvage treatment of circulatory and respiratory failure when conventional treatments are ineffective. Bypass with ECMO can rapidly improve the state such as circulatory failure and hypoxemia in critically ill patients in short term and can partially or fully replace their cardiopulmonary function in long term, winning valuable time for normal recovery of cardiopulmonary function. Because of the physical state of severe trauma patients and the ECMO equipment, there are still various complications clinically. Trauma patients show high risk of bleeding, vulnerability to wound infection and probability of combined organ injury and dysfunction, so more comprehensive measures for the prevention and treatment of complications during the use of ECMO therapy are required. The authors review the research progress in complications and corresponding prevention and treatment strategies during ECMO support for severe trauma, aiming to provide a reference to prevent and treat these complications.

Blast injury of the chest injury is the most common wound in modern war trauma and terrorist attacks, and is also the most fatal type of whole body explosion injury. Most patients with severe blast injury of the chest die in the early stage before hospitalization or during transportation, so first aid is critically important. At present, there exist widespread problems such as non-standard treatment and large difference in curative effect, while there lacks clinical treatment standards for blast injury of the chest. According to the principles of scientificity, practicality and advancement, the Trauma Society of Chinese Medical Association has formulated the guidance of classification, pre-hospital first aid, in-hospital treatment and major injury management strategies for blast injury of the chest, aiming to provide reference for clinical diagnosis and treatment.

【Objective】 To investigate the availability and convenience of emergency blood transfusion in mainland China, and develop strategies for improvement. 【Methods】 The electronic questionnaire was self-made by the research team, and pushed to physicians and technicians related to emergency blood use and supply nationwide through the WeChat group of professional organizations such as the Chinese Medical Doctor Association′s Emergency Resuscitation and Disaster Medicine Professional Committee. The data was automatically aggregated by the internet survey platform named questionnaire star, and analyzed by statistics software SPSS 21.0. 【Results】 1) General information: A total of 3 151 questionnaires were collected, of which 85% (2 678 / 3 151), from 31 provinces, municipalities or autonomous regions in mainland China were valid, and 39%(1 044/2 678), 22%(577/2 678), 39%(1 057/2 678) were from the east, middle and west region, respectively; 78%(2 099/2 678) were from tertiary hospitals, and 22%(579/2 678) secondary hospitals and below; 60%(1 607/2 678), 16%(425/2 678), and 24%(646/2 678) were from Emergency Department(EM), Intensive Care Department (ICU) and other departments respectively. The respondents with senior position titles took up 34%(906/2 678) while those with intermediate and junior position titles took up 30% (798/2 678) and 36%(974/2 678) respectively. 2) Availability : 63%(1 680/2 678) of the respondents experienced untimely and insufficient blood supply at least once during June 2017 to May 2020, of which 75% (1 256/1 680) occurred in the past year. In the past half year, 51% (381/1 057) of respondents in the western region and 34% (713/2 099) in tertiary hospitals experienced more emergency blood shortages (P<0.05). The most prone to clinical blood supply shortage were red blood cells and whole blood, platelets and other plasma components, accounting for 43% (1151/2678), 42% (1125/2678) and 15% (402/2678), respectively. 48% (1 274/2 678) respondents believed that the insufficient blood supply for emergency use " has caused a significant adverse effect on the quality of rescue", and 40% (1 081/2 678) believed that it was " a potential medical safety threat" .3)Convenience: The waiting time for emergency blood transfusionwithin 0.5 h, 1 h and 2 h accounted for 28% (741/2 678), 71%(1 903/2 678) and 90% (2 547/2 678), respectively. The waiting time of emergency blood transfusion within 0.5 h accounted for 50% (286 / 577) in central region, which was significantly higher than that in eastern or western region (P < 0.05). 67% (889/2 678) of respondents experienced blood inventory depletion, of which 30%(792/2 678) had to wait for more than 8 hours for resuming blood supply. 80% (751/1 057) of the respondents in the western region experienced inventory depletion, significantly higher than that in the central region (P<0.05). 4)The influencing factors were mainly insufficient blood donation, growth of clinical demand in blood, blood waste due to expiration and clinical irrational use, accounted for 56% (1 485/2 678), 23% (619/2 678), 7% (183/2 678) and 6% (167/2 678) respectively. 60% (633/1 057) of the respondents in the western region considered insufficient blood donation as the influencing factors, statistically higher than that in the eastern and central regions (P<0.05).5)Suggestions for improvement included more voluntary blood donation, development of blood substitutes, standardization of clinical blood use and extension of blood storage shelf life, accounted for 49% (1 326/2 678), 24% (645/2 678), 19% (499/2 678), and 8% (208/2 678), respectively. 53% (561/1 057) of the respondents in the western region suggested strengthening voluntary blood donation (P<0.05), while 26% (268/1 044), 26% (152/577), 25% (553/2099) of respondents in the eastern, central region and tertiary hospitals respectively suggested strengthening the research and development of blood substitutes (P<0.05). 56% (504/906) of respondents with senior professional titles recommended strengthening voluntary blood donation, while 26% (453/1 772) and 0.9% (164/1 772) of those with intermediate and junior technical titles recommended research and development of blood substitutes and improvement of blood storage technology, respectively(P<0.05). 【Conclusion】 The whole blood reserve can not fully meet clinical emergency needs at present stage, especially in the western region and some tertiary hospitals,, showing the necessity to adopt comprehensive measures to further improve the availability and convenience of emergency blood transfusion, including strengthening voluntary blood donation, developing blood substitutes, prompting rational clinical blood use and improving blood storage technology.

Objective:To summarize critical cases of emergency helicopter transferring between hospitals and improve the quality and safety of critical care.Methods:The task records of Guangxi Aviation Medical Rescue Training Base from September 2017 to September 2020 were retrieved. The mission acceptance, implementation results, disease spectrum composition, pre-transfer preparation and medical intervention on board were summarized.Results:① General information: a total of 168 patients of helicopter transfer requests were registered, of which 36 patients were transferred, 35 patients were successful, 1 patient had cardiac arrest during the landing phase, and died several hours after continuous resuscitation. Of the 36 patients 30 were males and 6 were females, with median age of 50.5 (29.8, 66.0) years old, the average transfer time was (54.95±17.89) minutes, and the average transfer distance was (205.74±74.68) km. ② Disease spectrum included 11 cases of stroke (30.55%), 7 cases of trauma (19.45%), 5 cases of severe pneumonia (13.89%), 5 cases of heart and macro-vascular diseases (13.89%), 5 cases of abdominal emergency (13.89%), and 3 other conditions (8.33%).③ Severity: 31 patients (86.11%) were severe (≥15) according to acute physiology and chronic health evaluation Ⅱ (APACHEⅡ) score; 19 patients (52.78%) were high-risk emergency transport (≥6) according to Hamilton early warning score (HEWS); 6 patients (85.71% of trauma patients) were severe trauma (≥16) according to injury severity score (ISS). ④ Preparation before transfer: remote consultation was carried out to evaluate the latest state of the patient's condition, especially the respiratory and circulatory conditions. Relevant items were reviewed and emergency treatments were implemented when necessary. Targeted preparation was made for accidents that might occur during transfer, such as electrocardiogram (94.44%), blood gas analysis (94.44%), brain CT (36.11%) and other auxiliary examinations, endotracheal intubation or tracheotomy (72.22%), deep vein catheterization (91.67%), placement of gastric tube (86.11%) and urinary tube (88.89%), adjustment of sedative (38.89%), vasoactive drugs (58.33%) and drugs for dehydration and lowering intracranial pressure (33.33%), and fixation of fracture (11.11%), etc. ⑤ On-board medical intervention: cardiac monitoring, blood pressure, respiration and blood oxygen monitoring were carried out in all patients. The parameters of patients using ventilator were adjusted in time (66.67%). The dosage of patients using micropump was adjusted in time (91.67%). Other aspects included the use of sedative and analgesics (38.89%), sputum suction nursing (75.00%), all kinds of catheter nursing (endotracheal intubation/incision nursing of 72.22%, indwelling catheter nursing of 88.89%), and cardiopulmonary resuscitation for patient with cardiac arrest (2.78%).Conclusion:As the patients transferred by helicopter are mainly those of critically ill at this stage, the requirements for airborne medical equipment and rescue technology are high, and there is an urgent need to establish technical specifications and personnel training standards.

Objective:To develop a novel α vβ 3-targeted theranostic agent 177Lu-Evans blue (EB)-Arg-Gly-Asp (RGD) and evaluate its value for SPECT imaging and targeted radionuclide therapy in the non-small cell lung cancer (NSCLC)-patient-derived xenografts (PDX). Methods:The α vβ 3-targeted molecule RGD was conjugated with the albumin binding moiety EB to obtain EB-RGD, and EB-RGD was further conjugated with the chelator 1, 4, 7, 10-tetraazacyclododecane-1, 4, 7, 10-tetraacetic acid (DOTA) for 177Lu radiolabeling. NSCLC-PDX mice models ( n=68) were established. 177Lu-EB-RGD SPECT imaging, biodistribution study were performed in 28 PDX mice models after being injected with 177Lu-EB-RGD or 177Lu-RGD. Targeted radionuclide therapy were subsequently performed in NSCLC-PDX mice models, saline group (group A), 18.5 MBq 177Lu-RGD group (group B), 18.5 MBq 177Lu-EB-RGD group (group C), 29.6 MBq 177Lu-EB-RGD group (group D), n=10 in each group; tumor volumes of PDX mice models in each group were observed within 50 d. Differences between 2 groups were compared using independent-sample t test. Results:177Lu-EB-RGD was radiolabeled at a specific activity of (55±14) GBq/μmol, with a radiochemical yield of more than 95% and a radiochemical purity of more than 95%. Regarding the SPECT imaging, tumors in NSCLC-PDX mice were clearly observed from 4 to 96 h post-injection and the tumor to muscle ratio (T/M) reached 7.34±0.67, 14.63±3.82, 15.69±3.58 and 15.99±5.42 at 4, 24, 72, 96 h post-injection, respectively. Biodistribution study further confirmed the findings from SPECT imaging, and the tumor uptake of 177Lu-EB-RGD were markedly increased compared to 177Lu-RGD 4 h post-injection ((10.15±1.17) vs (3.30±1.47) percent injection dose per gram (%ID/g); t=18.60, P<0.05). Regarding targeted radiotherapy, the tumor volumes were quickly increased within 50 d after treatment in group A and B, while the tumor volumes were decreased in group C and D, until the tumors in group C and D disappeared at the 28th day after initial treatment with no sign of recurrence during the observation period. Conclusions:177Lu-EB-RGD can target α vβ 3-positive NSCLC-PDX with intense tumor to background ratio and strong tumor inhibition efficacy. The preclinical data suggests that 177Lu-EB-RGD may be an effective new treatment option for advanced NSCLC patients with resistance or ineffective results for targeted therapy.

Objective:To investigate the therapeutic efficacy and potential mechanisms of integrin α vβ 3-targeted radionuclide therapy (TRT) in combination with anti-programmed cell death protein ligand 1 (PD-L1) immunotherapy. Methods:Integrin α vβ 3-targeted molecule Arg-Gly-Asp (RGD) was conjugated with Evans blue (EB) and then labeled with 177Lu to obtain 177Lu-EB-RGD. The radioactivity and radiochemical purity were determined. MicroSPECT imaging, biodistribution, and in vivo therapeutic efficacy were subsequently performed in MC38 murine colon cancer models. Volume of tumor and body mass of mice were observed to assess the therapeutic efficacy and safety ( n=9 in each group). Flow cytometry was used to evaluate therapy response of saline-treated (control, group A), 18.5 MBq 177Lu-EB-RGD-treated (group B), 10 mg/kg PD-L1 antibody-treated (group C), TRT combined with immunotherapy-treated (group D, 18.5 MBq 177Lu-EB-RGD and 10 mg/kg PD-L1 antibody) mice and alterations in tumor microenvironment (PD-L1 + immune cells, CD8 + T cells and regulatory T cells). Independent-sample t test and repeated measures analysis of variance were used for data analysis. Results:The radioactivity of 177Lu-EB-RGD was (55.85±14.00) GBq/μmol. SPECT imaging clearly visualized the MC38 tumors in mice models with high uptake and long retention time, the tumor/muscle ratio reached 14.87±0.88 at 24 h postinjection, while less uptake and retention in normal tissues. Tumor uptake of 177Lu-EB-RGD was significantly higher than that of 177Lu-RGD 4 h post-injection ((12.00±1.60) vs (3.69±0.37) %ID/g; t=8.63, P<0.01). The efficacy results between each treatment group was significantly different ( F=7.32, P=0.03) at day 6 post-treatment. The combination therapy showed the most outstanding anti-tumor efficacy with 7/9 mice showed complete response. Flow cytometry results showed that TRT up-regulated the PD-L1 expression significantly, namely, PD-L1 + immune cells in group B and group A were significantly different (CD45 + /PD-L1: 2.34% vs 0.95%, CD11b + /PD-L1: 2.41% vs 0.66%; t values: 11.17 and 8.70, both P<0.01); immunotherapy and combination therapy dramatically stimulated the infiltration of CD8 + T cells (2.07% vs 0.26%, 2.71% vs 0.26%; t values: 4.10 and 6.03, both P<0.05). Conclusion:TRT in combination with immunotherapy synergistically enhance anti-tumor efficacy, which is expected to play a role in the treatment of patients with advanced tumor where TRT can be applied.

Objective This study will compare crystalloid to colloid for goal-directed fluid therapy (GDFT) in cesarean section under combined spinal epidural anesthesia,and to discuss which type of fluid is more effective to prevent perioperative hypotention.Methods We randomly assigned 60 patients (ASA Ⅰ-Ⅱ) scheduled undergoing cesarean section into two groups:colloid group and crystalloid group.The colloid group received balanced 6％ HES (130/0.4,Volulyte) and Lactated Ringer's solution (LR),while the crystalloid group just received LR as haemodynamic optimization fluid.The primary outcomes included the incidence of maternal hypotension,and vasopressor doses prior to delivery.The secondary outcomes included umbilical blood gas abnormalities,neonatal Apgar grade and adverse events.Results The impact fluid volume,total liquid volume and urine volume in the crystalloid group were more than those in the colloid group (P ＜ 0.05).No statistical difference was seen in the number of patients who showed hypotension,vomiting and nausea between two groups.And there was no significant difference in the incidence of neonatal adverse effects between two groups.Conclusions No evidence showed that colloid had more advantages in GDFT for patients received cesarean section under combined spinal epidural anesthesia,except that the volume of colloid input was less than crystalloid.