Objective To prepare pH-responsive osmotic nanocarriers (pMPPs),observe their distribution in the genital tract mucosa in mice,and evaluate their radiosensitizing effects in tumor cells.Methods Amphiphilic polymers containing pH-sensitive hydrazone bonds were synthesized and pMPPs were prepared by ultrasonic emulsification.At the same time,the hydrophobic polymer polylactic acid-glycolic acid copolymer (PLGA) and the amphiphilic polymer PLGA-polyethylene glycol without hydrazine bond were selected,and the mucoadhesive nanoparticles(MPs) and mucus-penetrating particles (MPPs) were prepared in the same way.Fluorescence microscopy was used to observe the distribution of three kinds of nanocarriers labeled with fluorescent dye Cy5.5 in the genital tract mucosa.The toxicity of nanocarriers to human cervical cancer cell line HeLa was tested by thiazolyl blue assay.The amphiphilic polymer containing pH-sensitive hydrazone bond was combined with oil-soluble gold nanoparticles to form a multi-encapsulated nanocarrier,and its radiotherapy sensitization effect in HeLa cells was evaluated by thiazole blue assay.Results The pMPPs were successfully prepared with relatively uniform particle size and good dispersion.Fluorescence microscopy showed that pMPPs not only had good mucus permeability,but also could improve the endocytosis efficiency of the nanocarriers in reproductive tract mucosa.The results of thiazolyl blue test showed that when the concentration of the carrier reached to 0.80 mg/ml,the survival rate of HeLa cells in the pMPPs group was higher than 90％ which was higher than that in the MPs and the MPPs groups,indicating that pMPPs had good biosafety.The HeLa cell survival rate of the CMNa group (0.80 mg/ml) was higher than that of the multi-package nanocarrier group under different doses of X-ray irradiation (4 Gy:82.90％ vs.61.79％;8 Gy:64.75 ％ vs.42.36％).This result indicated that compared with the CMNa,a commonly used clinical radiotherapy sensitizer,the multi-encapsulated nanocarriers can more effectively enhance the sensitivity of tumor cells to radiation therapy,thereby improving the lethality of radiation therapy on tumor cells.Conclusion This study solved the conflict between mucus permeation and endocytosis design of nanocarriers in mucosal tissue application,and provided new insight for the treatment of mucosal tissue diseases.

Objective To observe the influence of nursing intervention based on International Classification of Functioning, Disability and Health (ICF) in the course of dysphagia for stroke patients. Methods A total of 60 stroke patients were chosen with dysphagia in the Second Affiliated Hospital of Xi'an Jiaotong University for the study.These patients were randomly divided into the control group and the intervention group with 30 cases in each group,two groups were directly treated with routine training, oral care, menthol popsicle stimulation, balloon dilatation treatment, swallowing electrical stimulation, basic training of swallowing and health education. The intervention group was assessed and intervened based on 34-item dysphagia ICF core project which Dongyi refined in addition to conventinal nursing.The grade was measured by the Kubota Toshio's drinking test,and the Surface Electromyography(sEMG)was performed to compare the swallowing duration and maximum amplitude in the masseter, the orbicularis oris, submental, and the lower hyoid muscles before intervention, after 4 weeks and after 8 weeks. Results The average grade in Kubota Toshio′s drinking test before intervention,after 4 weeks and after 8 weeks in the control group and the intervention group were 4.12±0.23,3.34±0.57,2.76±0.46 and 4.29± 0.25,2.82 ± 0.39,1.81 ± 0.41, intra group comparison was statistically significant (F=67.19, 368.56, P<0.01).Comparison between two groups in 4 weeks,8 weeks after intervention was statistically significant (t=4.81, 7.22,P<0.01). In the control group, intra group comparison of swallowing duration in the masseter,the orbicularis oris,submental,and the lower hyoid muscles before intervention,after 4 weeks and after 8 weeks was statistically significant(F=18.40-34.65,P<0.01).In the intervention group,intra group comparison of swallowing duration in the masseter, the orbicularis oris, submental, and the lower hyoid muscles before intervention,after 4 weeks and after 8 weeks was statistically significant(F=127.82-174.93, P<0.01). There were significant differences in swallowing duration in the masseter, the orbicularis oris,submental,and the lower hyoid muscles in 4 weeks,8 weeks after intervention between the two groups(t=-5.32-10.14,P<0.01).In the control group,intra group comparison of maximum amplitude in the masseter,the orbicularis oris,submental,and the lower hyoid muscles before intervention,after 4 weeks and after 8 weeks was statistically significant(F=28.11-90.54,P<0.01).In the intervention group,intra group comparison of the maximum amplitude in the masseter, the orbicularis oris, submental, and the lower hyoid muscles before intervention,after 4 weeks and after 8 weeks was statistically significant(F=60.91-178.31,P<0.01).There were significant differences in the maximum amplitude in 4 weeks,8 weeks after intervention between the two groups(t=-8.82--4.06,P<0.01). Conclusions Nursing intervention based on ICF has obvious curative effect on stroke patients with dysphagia.

Objective To prepare polyethylene glycol/cyclic asparagines-glycine-arginine functionalized gold nanoparticles (GNPs-PEG@cNGR) and evaluate their effectiveness in CT imaging of breast cancer angiogenesis.Methods The GNPs were synthesized by one-step reduction of chloroauric acid by sodium citrate.The thiolated PEG and cysteine-modified cNGR were coupled to the surface of GNPs through Au-S bonds,respectively.The GNPs-PEG@cNGR was characterized by transmission electron microscopy,Zeta potential/hydration particle size analyzer,and Fourier transform infrared spectrometer.The uptake and CT imaging effect of GNPs-PEG@cNGR were assessed by human umbilical vein endothelial cells (HUVEC) and human hepatoma cells (HepG2) positively expressed for aminopeptidase N (APN/CD 13).The in vivo CT imaging effects on tumor angiogenesis and biocompatibility in mice of GNPs-PEG@cNGR were studied by BALB/c mouse model of 4T1 breast cancer.Results A specific CT molecular probe,i.e.GNPs-PEG@cNGR,was successfully constructed,which can target angiogenesis.The probe was spherical,with a hydration particle size of (35.7± 1.0) nm and a Zeta potential of (-13.54± 1.12) mV,and had good stability and biocompatibility.The GNPs-PEG@cNGR has good CT imaging results and can specifically target CD13-positive HUVEC and HepG2 cells.The CT imaging results in 4T1 breast cancer mice indicated that GNPs-PEG@cNGR could be specifically enriched in the tumor tissue after injection.The CT value of tumors in GNPs-PEG@cNGRz group was higher than that of GNPs-PEG group,and the difference was statistically significant (P＜0.05).Conclusions GNPs-PEG@cNGR can specifically target CD13 positive cells and can be used as a CT contrast agent for imaging tumor angiogenesis.

Objective To investgate the application value of low-dose CT scanning in right adrenal vein imaging.Methods A total of 124 patients were enrolled in the study who were suspected as primary aldosteronism and requiring a contrast enhanced CT examination on adrenal glands.Four patients were excluded according to the exclusion criteria,so that the rest 120 patients were divided equally into three groups.Group A was a control group with conventional radiation dose using tube voltage of 120 kV and automatic mA.It was divided into A1,A2 and A3 groups according to arterial phase,portal venous phase and parenchymal phase.Group B was a experimental group with conventional tube voltage of 120 kV and automatic mA,which was divided into B1,B2 and n3 groups according to arterial phase,late arterial phase and portal venous phase.Group C was a low-dose experimental group with a tube voltage of 100 kV and a tube current of 150 mA only in the second phase,the remaining scanning parameters and method were the same as that of group B.The subjective scores of the images of groups A,B and C were statistically analyzed,and the CT values of the right adrenal vein(RAV),the right adrenal gland(RAG),and the fat of anterior abdominal wall at different scan phases were measured.The dose length products (DLP) were recorded and the signal-to-noise ratios (SNR),contrast-to-noise ratios (CNR),effective doses (E) of the three groups were calculated and compared.Results The subjective scores of the two observers were consistent (Kappa value =0.63);the subjective scores of the B2 images were statistically significant (H =7.18,P＜0.05).Difference of subjective scores between B2 and A2was statistically significant (t=-18.03,P＜0.05).The CT values of RAV,SNR,and CNR of the B2 group were higher than those of the A2 group (t=36.99,6.92,9.02,P＜0.05).The radiation dose comparison showed that the effective dose (E) was 45.52％ lower in the low-dose group than the conventional dose group with the statistically significant difference(t =12.19,P＜0.05).Conclusions Using MDCT scanning technique with lower tube voltage and lower tube current of 100 kV-150 mA,the detection rate of right adrenal vein can reach 95％ in the late arterial phase,and the effective dose can be reduced about 45.52％ on the basis of ensuring image quality.

Objective To evaluate the clinical value of CT urography (CTU) in quantitative analysis of single?kidney renal glomerular filtration rate (GFR) in patients with renal tumor and hydronephrosis.Methods A total of 49 patients with renal tumor or hydronephrosis from January 2018 to September 2018 in the Second Hospital of Tianjin Medical University were prospectively collected. In all cases, the CT urography and 99mTc?DTPA renal dynamic imaging data and related clinical data were collected. All patients were divided into two groups: the experimental group (39 patients with a total of 78 kidneys) and the validation group (10 patients with a total of 20 kidneys). According to the presence or absence of renal diseases, the kidneys of the experimental group and the validation group were further divided into four groups, namely, the single kidney group, the tumor group, the stagnant water group and the healthy group. The CT urography protocol consisted of noncontrast, arterial phase, nephrographic, and excretory phase imaging. The total renal GFR was determined by CT measurement of renal clearance of contrast media (CM), and the total CT?GFR was then split into single?kidney CT?GFR by a left and right kidney proportionality factor. Differences between CT?GFR and SPECT?GFR measurements in each group of the experimental group was compared by paired?sample t test. Correlations between CT?GFR and SPECT?GFR in the experimental group and their correlations with RPV was analyzed by Pearson method. The Bland?Altman mapping method was used to evaluate the consistency between CT?GFR and SPECT?GFR in the experimental group. Results Paired difference between single?kidney CT?GFR (48.76 ± 18.50) ml·min-1·1.73 m-2 and single?kidney SPECT?GFR (45.68±17.95) ml·min-1·1.73 m-2 in the experimental group, P<0.05, demonstrating 6.8% systemic overestimation. A good correlation(r=0.80, P<0.01) and consistency (± 22.50 ml·min-1·1.73 m-2, ± 49.2% measurement deviations) was revealed between both measurements. There were positive correlations between CT?GFR and SPECT?GFR in the renal tumor group, hydronephrosis group, and healthy kidney group (r=0.67, 0.92, 0.80; P<0.01) respectively, and with good agreement (95% CI measurement deviation<30 ml·min-1·1.73 m-2). In all validation groups, there was no statistical difference between the estimated and true values of the Gates?GFR (all P>0.05). Pearson Correlation analysis showed that the correlations between CT?GFR and RPV in all experimental groups were better than the correlation between Gates?GFR and RPV (P<0.05). Conclusions This study demonstrated the feasibility of using CT urography to measure single?kidney GFR, verifying its application value in diseases such as kidney tumors and obstructive hydronephrosis, and proved that the proposed single?kidney CT?GFR correlates better than the SPECT?GFR with RPV.

Tumor neovascularization plays an important role in the occurrence, development and metastasis of cancer. Non-invasive quantification and detection of tumor neovascularization is crucial for early diagnosis and prognosis assessment of cancer. Targeted molecular imaging has arisen in vascular targeting imaging and precise treatment based on the molecular characteristics of neovascularization. Aminopeptidase N (APN, or CD13) is a multifunctional membrane-bound exopeptidase that is overexpressed in neovascular endothelial cells and some tumor cells but rarely expressed in normal blood vessels, which makes it a potential target for tumor neovascularization imaging and anti-angiogenic therapy. This review summarizes the application progress and the future development trend of target molecular imaging and precise treatment based on CD13.

Objective:To explore the influencing factors for falls in inpatients during the rehabilitation period of stroke and research humanistic care strategies.Methods:Using a retrospective case-control study design,32 stroke patients who experienced falls in the rehabilitation department of the Second Affiliated Hospital of Xi'an Jiaotong University from January 2019 to December 2022 were selected as the observation group,and 64 stroke patients who were hospitalized in the same department during the same period and did not suffer from falls were matched 1:2 by age and gender as the control group.Logistic regression analysis was used to determine the influencing factors for falls in inpatients during the rehabilitation period of stroke.Results:The results of multivariate analysis showed that a history of falls(OR=8.688,P=0.036),a fall risk score(OR=1.615,P=0.018),sleep disorders(OR=5.378,P=0.031),malnutrition(OR=11.071,P=0.035),and osteoporosis(OR=15.831,P=0.006)were the independent risk factors for falls in inpatients during the rehabilitation period of stroke.Conclusion:There are many influencing factors for falls in inpatients during the rehabilitation period of stroke.Medical staff should take effective intervention measures based on different risk factors and implement humanistic care to reduce the incidence of falls in inpatients during the rehabilitation period of stroke.

Objective:Breast cancer has been the first cancer among women with the incidence increasing gradually. In September 2016, the Breast Cancer Cohort Study in Chinese Women (BCCS-CW) was initiated, aiming to establish a standardized and sharable breast cancer-specific cohort by integrating the existing cohort resource and improving the quality of follow-up. The BCCS-CW may provide a research basis and platform for the precision prevention and treatment of breast cancer in etiology identification, prevention, early diagnosis, treatment, and prognosis prediction.Methods:We conducted a population-based perspective cohort by questionnaire interview, anthropometry, biological specimens, breast ultrasound and mammography. The cohort was followed by using regional health surveillance and ad hoc survey.Results:Finally, BCCS-CW included 112 118 women, in which 55 419 women completed the standardized investigation and blood specimens were collected from 54 304 women. The mean age of participants was 51.7 years old, 62.7% were overweight or obese, and 48.9% were menopausal.Conclusion:The BCCS-CW will provide population-based cohort resource and research platform for the precise prevention and treatment of breast cancer in Chinese women.