Objective To systematically retrieve,evaluate and integrate the best evidences on the early fluid resuscitation management in the patients with acute pancreatitis(AP)at home and abroad to provide ref-erence for clinical decision.Methods The related evidences on the early fluid resuscitation management in the AP patients were retrieved by computer from the databases of BMJ Best Practice,Up To Date,JBI,National Institute for Health and Care Excellence,Registered Nurses Association of Ontario,Guideline International Network,Scottish Intercollegiate Guidelines Network,International Association of Pancreatology,American Pancreatic Association,American College of Gastroenterology,Yimaitong,Cochrane Library,PubMed,Em-bass,CINAHL,The Web of Science,CNKI,Wanfang databases.The retrieval time limit was from the data-base establishment to March 20,2022.The literatures types included thematic evidence summarization,guide-lines,evidence summaries,systematic reviews and expert consensus.The researchers conducted the literature quality evaluation.The literatures meeting the standard conducted the evidence extraction.Results A total of 13 arti-cles were included,including 3 special subject evidence summary,4 guidelines,2 evidence summary,2 systematic evalu-ation and 2 expert consensus.A total of 16 pieces of best evidence were integrated,involving 4 aspects of organization management,evaluation and monitoring,fluid infusion strategy and health education.Conclusion It is recommended to use the target-oriented therapy for early fluid resuscitation management,and perform the fluid resuscitation immediate-ly after diagnosis,according to the patient's underlying disease,disease changes and monitoring indicators,implement precise early fluid resuscitation in order to reverse pancreatic microcirculation disorder,increase tissue perfusion and improve the patient's prognosis.

Objective To evaluate the characteristics of dose distribution of neuronal networks in vitro on microelectrode arrays(MEAs)under 2.6 GHz radiofrequency(RF)exposure.Methods The MEAs were coupled with a real-time RF exposure setup,and electromagnetic simulation software was used to calculate the RF dose absorbed in cultured neuronal networks.A fiber-optic temperature probe was used for experimental validation and monitoring of the cell temperature during RF exposure.The MEAs were used to record the electrical activity of neurons.Results For an input power of 1 W,a specific absorption rate(SAR)level of(15.51±2.48)W/kg was calculated,and the variability of the SAR distribution was 16%.In our experimental system,the temperature elevation of neurons was up to 0.15℃for an SAR of 4 W/kg RF exposure.Conclusion The exposure device can provide high SAR efficiency and uniformity in the 2.6 GHz band,which is suitable for studying the real-time effects of RF fields on the electrical activity of neuronal networks in the 5G network band.

Objective To investigate the influencing factors of unplanned rehospitalization within one year after surgery among adult renal transplant recipients. Methods The clinical data of 299 recipients who underwent renal transplant surgery in the Department of Organ Transplantation of the Affiliated Hospital of Guizhou Medical University from January 2020 to December 2022 were retrospectively analyzed. The recipients were divided into unplanned rehospitalization group and non-rehospitalization group based on whether they experienced unplanned rehospitalization within one year after surgery. Univariate analysis and binary Logistic regression analysis were performed to explore the influencing factors of unplanned rehospitalization within one year after renal transplantation. Results Among the 299 recipients, 102 experienced unplanned rehospitalization, with an incidence rate of 34.11%. Univariate analysis revealedstatistically significant differences were noted between the two groups in terms of gender, occupational status, preoperative underlying disease, rejection reactions, nosocomial infections, immunosuppressive medication regimens, serum creatinine, cystatin C, serum phosphorus, serum potassium, and initial hospitalization duration (P < 0.05). Binary Logistic regression analysis showed that having ≥3 kinds of preoperative underlying disease (OR=2.122, 95%CI, 1.198 to 3.759) and experiencing rejection reactions (OR=3.162, 95%CI, 1.217 to 8.218) were independent risk factors for unplanned rehospitalization within one year after renal transplantation (P < 0.05). Conclusion The rate of unplanned rehospitalization within one year after surgery is relatively high among adult renal transplant recipients. Having ≥3 preoperative underlying disease and experiencing rejection reactions are independent risk factors for unplanned rehospitalization within one year after surgery. Transplantation healthcare teams can develop corresponding strategies targeting these risk factors to reduce the rate of unplanned rehospitalization and alleviate the burden of disease.

Objective:To investigate the effects of RNA interference on the expression level of leptin and its effect on proliferation, TGF-β 1 and collagen type Ⅰ production in human pathological scar fibroblasts in vitro. Methods:Pathological scar tissues (hypertrophic scar, keloid) were collected from the Department of Burn Plastic Surgery in Affiliated Hospital of North Sichuan Medical College. After primary cell culture and cell passage, passage 3 cells were selected for experimental study. The cells were divided into two groups: the experimental group which was transfected with leptin siRNA, and the negative control group which was transfected with empty vector. Examinations were carried out 48 hours after transfection. Cell proliferation was determined by CCK-8. The transcription levels of leptin, TGF-β 1 and type Ⅰ collagen genes were detected by polymerase chain reaction (PCR). The protein expression levels of leptin, TGF-β 1 and type Ⅰ collagen were determined by immunofluorescence and Western blotting. Student′s t-test was used for comparison between groups, and P<0.05 was considered statistically significant. Results:Five hypertrophic scars and five keloids were included. Compared with the negative control groups, the proliferation ability ( A450) of leptin-SiRNA transfected fibroblasts were not significantly different ( P>0.05). The relative mRNA expression levels of leptin, TGF-β 1 and type Ⅰ collagen in hypertrophic scars and keloids were significantly decreased in the siRNA transfection groups compared with the negative control groups ( P<0.05). Immunofluorescence results showed that the expression levels of leptin, TGF-β 1 and type I collagen in keloids were higher than those in hypertrophic scars, and that siRNA induced leptin downregulation significantly reduced the levels of leptin, TGF-β 1 and type I collagen in both hypertrophic scars and keloids. Western blotting showed that the protein levels of leptin, TGF-β 1 and type Ⅰ collagen were significantly decreased in hypertrophic scar and keloid fibroblasts after leptin siRNA interference ( P<0.05). Conclusions:Downregulation of leptin gene expression by RNA interference inhibited TGF-β 1 and typeⅠ collagen expression, which could be used in treating pathological scar.

Objective:To analyze the damage in hippocampal tissues of mice after whole-body irradiation with high- or low-dose ionizing radiation and to investigate the roles of microglia/macrophages polarization in the injury.Methods:C57BL/6 mice were randomly divided into three groups: sham irradiation group, low-dose group (0.05 Gy) and high-dose group (7 Gy). Low- and high-dose groups were respectively treated by whole-body irradiation with single dose of 60Co γ-rays. Hippocampal tissues of the mice were collected at 6 h, 1 d, 3 d and 7 d after irradiation. The morphology, structure and apoptosis of neurons were detected by HE staining, Nissl staining and Tunnel staining, respectively. RT-PCR and immunofluorescence assay were performed to detect the expression of M1 and M2 microglial markers at mRNA and protein levels in hippocampus tissues. The cognitive and emotional behaviors of mice were evaluated one month after the irradiation by Morris water maze, open field test, elevated plus maze and tail suspension test. Results:There were morphological and structural changes in the nerve cells in the hippocampus region of mice after irradiation, accompanied by apoptosis. Acute injuries occurred at 6 h after radiation, alleviated at 1 d and 3 d, and persisted at 7 d in a dose-dependent manner. The results of immunofluorescence staining and confocal imaging analysis showed that compared with the sham irradiation group, the high-dose group showed increased number of microglia, down-regulated expression of M1 microglial markers and up-regulated expression of M2 microglial markers in the hippocampus at 6 h and 1 d after radiation, while M2 microglial markers decreased at 3 d and 7 d after irradiation. PCR results showed that the expression of M1 and M2 microglial markers at mRNA level in the irradiation groups increased at 6 h after irradiation, but there was no statistical significance. The expression of related proinflammatory/anti-inflammatory factors was significantly up-regulated. The results of behavioral experiments showed that compared with the sham irradiation group, there was no statistical difference in cognitive or emotional behaviors at one month after irradiation.Conclusions:60Co γ-rays could damage mouse hippocampal tissues and result in the overexpression and different polarization patterns of microglia/macrophages in mice.

Objective:To investigate the effects of RNA interference on the expression level of leptin and its effect on proliferation, TGF-β 1 and collagen type Ⅰ production in human pathological scar fibroblasts in vitro. Methods:Pathological scar tissues (hypertrophic scar, keloid) were collected from the Department of Burn Plastic Surgery in Affiliated Hospital of North Sichuan Medical College. After primary cell culture and cell passage, passage 3 cells were selected for experimental study. The cells were divided into two groups: the experimental group which was transfected with leptin siRNA, and the negative control group which was transfected with empty vector. Examinations were carried out 48 hours after transfection. Cell proliferation was determined by CCK-8. The transcription levels of leptin, TGF-β 1 and type Ⅰ collagen genes were detected by polymerase chain reaction (PCR). The protein expression levels of leptin, TGF-β 1 and type Ⅰ collagen were determined by immunofluorescence and Western blotting. Student′s t-test was used for comparison between groups, and P<0.05 was considered statistically significant. Results:Five hypertrophic scars and five keloids were included. Compared with the negative control groups, the proliferation ability ( A450) of leptin-SiRNA transfected fibroblasts were not significantly different ( P>0.05). The relative mRNA expression levels of leptin, TGF-β 1 and type Ⅰ collagen in hypertrophic scars and keloids were significantly decreased in the siRNA transfection groups compared with the negative control groups ( P<0.05). Immunofluorescence results showed that the expression levels of leptin, TGF-β 1 and type I collagen in keloids were higher than those in hypertrophic scars, and that siRNA induced leptin downregulation significantly reduced the levels of leptin, TGF-β 1 and type I collagen in both hypertrophic scars and keloids. Western blotting showed that the protein levels of leptin, TGF-β 1 and type Ⅰ collagen were significantly decreased in hypertrophic scar and keloid fibroblasts after leptin siRNA interference ( P<0.05). Conclusions:Downregulation of leptin gene expression by RNA interference inhibited TGF-β 1 and typeⅠ collagen expression, which could be used in treating pathological scar.

Objective:To investigate the application of therapeutic grade ionization chamber to rapid measurement of short pulsed and high-dose-rate X-ray.Methods:The half-value layer of pulsed X-ray caused by an electron accelerator was measured by interpolation method and its equivalent energy was estimated. The cumulative doses from a certain amount of pulsed radiation at different distances in the same direction around the equipment were compared using the therapeutic grade ionization chamber and thermoluminescence measurement method . The relationship between the measurement result by using ionization chamber dosimeter and the distances away from source was analyzed. The cumulative doses from a certain amount of pulsed radiation at the same location at different frequencies were compared.Results:In working condition, 100 pulses of radiation were received accumulatively at 1 to 12 meters away from the outer wall of the equipment. The range of air Kerma was 0.08-9.65 mGy measured by using thermoluminescence dometers and 0.08 - 9.85 mGy using the ionization chamber dosimeters, respectively. The difference between both is within 10%. At different frequencies (1-10 Hz), there was no significant difference in X-ray air Kerma from 100 pulses measured by ionization chamber dosimeter at 2 m away from the front of the equipment ( P>0.05). Conclusions:The therapeutic grade ionization chamber dosimeter can be used for the rapid measurement of short pulsed X-ray radiation dose in the range of dose rates and pulse frequencies involved in the experimental accelerator device.

Objective:To investigate the prenatal MRI diagnosis of fetal intracranial hemorrhage (ICH) and the pregnancy outcomes.Methods:This retrospective study included 49 cases of fetal ICH diagnosed by MRI in Obstetrics and Gynecology Hospital of Fudan University from July 2011 to November 2019. Two experts with more than five years of experience in obstetric radiology determined the location, number, area, stage and grade of the hemorrhage based on the MRI findings. Maternal age, gestational age at MRI, and the site, number, stage and grade of hemorrhage as well as other intracranial and extracranial abnormalities of the fetuses were compared between women with fetal germinal matrix-intraventricular hemorrhage (GM-IVH; GM-IVH group, n=39) and those without (non-GM-IVH group, n=10). MRI and ultrasound examination results of 37 cases who had MRI within three days after the ultrasound examination were compared. Postnatal and follow-up outcomes were summarized. Statistical analysis was performed using the independent sample t-test, Mann-Whitney U test and Chi-square test. Results:There was no significant difference in the maternal age, gestational age at MRI, or the site, number or stage of hemorrhage between the GM-IVH group and non-GM-IVH group (all P>0.05). The incidence of ventriculomegaly was higher in the GM-IVH group than that in the non-GM-IVH group [87% (34/39) vs 0/10, t=24.522, P<0.001]. There were 51% (19/37) of the lesions that were missed by ultrasound found by MRI, including GM-IVH in 17 cases, right cerebellar hemisphere hemorrhage in one case and corpus callosum hemorrhage in one case. Among the 49 cases, seven were lost to follow-up, 29 terminated the pregnancy (six in non-GM-IVH group and 23 in GM-IVH group), two experienced intrauterine fetal death in late pregnancy and 11 gave live birth. Ten live births had GM-IVH, among them a relatively good prognosis was noted in fetuses with grade Ⅰ (two cases), grade Ⅱ (four cases), and grade Ⅲ (three cases) GM-IVH, while one case with grade Ⅳ GM-IVH had mental retardation at eight years old; one non-GM-IVH infant had hearing loss at birth and a cochlear was implanted with no other anomalies reported during a three-year follow-up. Conclusions:MRI can provide a more direct view of the location and grade of fetal ICH and is more accurate than prenatal ultrasound in diagnosing fetal ICH, which is a beneficial supplement to ultrasound. The prognosis of cases with grade Ⅳ GM-IVH is not good.

Objective To explore the set-up errors of position fixation with simple perforated foam pad in colorectal cancer radiotherapy and their causes as well as the improvement measures.Methods Sixty cases of color-ectal cancer patients undergoing radiotherapy were collected.Prone position was adopted with the position fixed by perforated foam pad and membrane.CBCT imaging was taken weekly before treatment,setup errors were corrected if necessary.Errors throughout the course of treatment for each patient were recorded and compared between patients, followed by analyzing the reasons of errors.Results Before calibration,the maximum errors on the direction of left and right (X-axis),front and back (Z),upside and downside (Y)in these 60 patients were 0.5cm,0.9cm and 0.7cm respectively with the average errors of (0.22 ±0.03)cm,(0.38 ±0.03)cm and (0.27 ±0.04)cm respec-tively.Conclusion The method of applying perforated foam pad and thermoplastic mask in colorectal cancer radio-therapy is currently the most commonly used in the clinical position fixation techniques,by which the small intestine, bladder and other pelvic tissues can be well protected.Due to poor comfort prone position,it is necessary to further improve perforated foam pad through improving the quality of the foam pad,thus improving patients comfort and posi-tioning repeatability and reducing position fixation errors.

Objective T o study the correlation of daily living activities with location and severity of trau-m atic brain injury (TBI) and to provide a theoretical basis for im proving the accuracy of expert opinion. Methods Five hundred and one cases of patients with TBI were selected. D etailed records included fol-lowing: pre-injury situation, location and severity of injury, treatm ent and education. D aily living activi-ties scale (B arthel index) was applied to test the subjects’daily living activities. T he relevance am ong location and severity of TBI and B arthel index was statistically analyzed. Results In m ild TBI group, there wasnosignificantdifferenceinBarthelindex among each location (P>0.05).Inmoderate TBIgroup, there were significant differences in B arthel index between subarachnoid hem orrhage and cerebral lobe injury, also between parietal, occipital lobes injury and frontal lobe injury, parietal, occipital lobes injury and temporallobe(P<0.05),respectively,whereasnosignificantdifference in Barthelindexbetween frontal lobe injury and tem poral lobe injury (P>0.05).In severe TBI,there were significant differences in Barthel index between every two different locations (P<0.05). Conclusion T here is som e correlation between the location of TBI and B arthel index, which provides an im portant reference value for analyzing and deter-m ining daily living activities after TBI.