Purpose: The aim of this study was to investigate the feasibility of an intelligent handheld ultrasound (US) device for assisting non-expert general practitioners (GPs) in detecting carotid plaques (CPs) in community populations. Methods: This prospective parallel controlled trial recruited 111 consecutive community residents. All of them underwent examinations by non-expert GPs and specialist doctors using handheld US devices (setting A, setting B, and setting C). The results of setting C with specialist doctors were considered the gold standard. Carotid intima-media thickness (CIMT) and the features of CPs were measured and recorded. The diagnostic performance of GPs in distinguishing CPs was evaluated using a receiver operating characteristic curve. Inter-observer agreement was compared using the intragroup correlation coefficient (ICC). Questionnaires were completed to evaluate clinical benefits. Results: Among the 111 community residents, 80, 96, and 112 CPs were detected in settings A, B, and C, respectively. Setting B exhibited better diagnostic performance than setting A for detecting CPs (area under the curve, 0.856 vs. 0.749; P<0.01). Setting B had better consistency with setting C than setting A in CIMT measurement and the assessment of CPs (ICC, 0.731 to 0.923). Moreover, measurements in setting B required less time than the other two settings (44.59 seconds vs. 108.87 seconds vs. 126.13 seconds, both P<0.01). Conclusion Using an intelligent handheld US device, GPs can perform CP screening and achieve a diagnostic capability comparable to that of specialist doctors.

Purpose: The aim of this study was to investigate the feasibility of an intelligent handheld ultrasound (US) device for assisting non-expert general practitioners (GPs) in detecting carotid plaques (CPs) in community populations. Methods: This prospective parallel controlled trial recruited 111 consecutive community residents. All of them underwent examinations by non-expert GPs and specialist doctors using handheld US devices (setting A, setting B, and setting C). The results of setting C with specialist doctors were considered the gold standard. Carotid intima-media thickness (CIMT) and the features of CPs were measured and recorded. The diagnostic performance of GPs in distinguishing CPs was evaluated using a receiver operating characteristic curve. Inter-observer agreement was compared using the intragroup correlation coefficient (ICC). Questionnaires were completed to evaluate clinical benefits. Results: Among the 111 community residents, 80, 96, and 112 CPs were detected in settings A, B, and C, respectively. Setting B exhibited better diagnostic performance than setting A for detecting CPs (area under the curve, 0.856 vs. 0.749; P<0.01). Setting B had better consistency with setting C than setting A in CIMT measurement and the assessment of CPs (ICC, 0.731 to 0.923). Moreover, measurements in setting B required less time than the other two settings (44.59 seconds vs. 108.87 seconds vs. 126.13 seconds, both P<0.01). Conclusion Using an intelligent handheld US device, GPs can perform CP screening and achieve a diagnostic capability comparable to that of specialist doctors.

Purpose: The aim of this study was to investigate the feasibility of an intelligent handheld ultrasound (US) device for assisting non-expert general practitioners (GPs) in detecting carotid plaques (CPs) in community populations. Methods: This prospective parallel controlled trial recruited 111 consecutive community residents. All of them underwent examinations by non-expert GPs and specialist doctors using handheld US devices (setting A, setting B, and setting C). The results of setting C with specialist doctors were considered the gold standard. Carotid intima-media thickness (CIMT) and the features of CPs were measured and recorded. The diagnostic performance of GPs in distinguishing CPs was evaluated using a receiver operating characteristic curve. Inter-observer agreement was compared using the intragroup correlation coefficient (ICC). Questionnaires were completed to evaluate clinical benefits. Results: Among the 111 community residents, 80, 96, and 112 CPs were detected in settings A, B, and C, respectively. Setting B exhibited better diagnostic performance than setting A for detecting CPs (area under the curve, 0.856 vs. 0.749; P<0.01). Setting B had better consistency with setting C than setting A in CIMT measurement and the assessment of CPs (ICC, 0.731 to 0.923). Moreover, measurements in setting B required less time than the other two settings (44.59 seconds vs. 108.87 seconds vs. 126.13 seconds, both P<0.01). Conclusion Using an intelligent handheld US device, GPs can perform CP screening and achieve a diagnostic capability comparable to that of specialist doctors.

Purpose: The aim of this study was to investigate the feasibility of an intelligent handheld ultrasound (US) device for assisting non-expert general practitioners (GPs) in detecting carotid plaques (CPs) in community populations. Methods: This prospective parallel controlled trial recruited 111 consecutive community residents. All of them underwent examinations by non-expert GPs and specialist doctors using handheld US devices (setting A, setting B, and setting C). The results of setting C with specialist doctors were considered the gold standard. Carotid intima-media thickness (CIMT) and the features of CPs were measured and recorded. The diagnostic performance of GPs in distinguishing CPs was evaluated using a receiver operating characteristic curve. Inter-observer agreement was compared using the intragroup correlation coefficient (ICC). Questionnaires were completed to evaluate clinical benefits. Results: Among the 111 community residents, 80, 96, and 112 CPs were detected in settings A, B, and C, respectively. Setting B exhibited better diagnostic performance than setting A for detecting CPs (area under the curve, 0.856 vs. 0.749; P<0.01). Setting B had better consistency with setting C than setting A in CIMT measurement and the assessment of CPs (ICC, 0.731 to 0.923). Moreover, measurements in setting B required less time than the other two settings (44.59 seconds vs. 108.87 seconds vs. 126.13 seconds, both P<0.01). Conclusion Using an intelligent handheld US device, GPs can perform CP screening and achieve a diagnostic capability comparable to that of specialist doctors.

Purpose: The aim of this study was to investigate the feasibility of an intelligent handheld ultrasound (US) device for assisting non-expert general practitioners (GPs) in detecting carotid plaques (CPs) in community populations. Methods: This prospective parallel controlled trial recruited 111 consecutive community residents. All of them underwent examinations by non-expert GPs and specialist doctors using handheld US devices (setting A, setting B, and setting C). The results of setting C with specialist doctors were considered the gold standard. Carotid intima-media thickness (CIMT) and the features of CPs were measured and recorded. The diagnostic performance of GPs in distinguishing CPs was evaluated using a receiver operating characteristic curve. Inter-observer agreement was compared using the intragroup correlation coefficient (ICC). Questionnaires were completed to evaluate clinical benefits. Results: Among the 111 community residents, 80, 96, and 112 CPs were detected in settings A, B, and C, respectively. Setting B exhibited better diagnostic performance than setting A for detecting CPs (area under the curve, 0.856 vs. 0.749; P<0.01). Setting B had better consistency with setting C than setting A in CIMT measurement and the assessment of CPs (ICC, 0.731 to 0.923). Moreover, measurements in setting B required less time than the other two settings (44.59 seconds vs. 108.87 seconds vs. 126.13 seconds, both P<0.01). Conclusion Using an intelligent handheld US device, GPs can perform CP screening and achieve a diagnostic capability comparable to that of specialist doctors.

Objective To explore the pathogenesis of Alzheimer's disease by examining the effects of dihydroartemisinin(DHA)on cognitive behavior,hippocampal,cerebral cortex and retinal cell morphology,β-amyloid(Aβ)and autophagy-related proteins in 5×FAD mice.Methods Twenty 5×FAD mice and 5 wild type(WT)mice were selected,all of which were female.The 5×FAD mice were randomly divided into model(M)group,donepezil(D)group,low-dose DHA(DHA-L)group,and high-dose DHA(DHA-H)group.The WT and M groups were not treated,and the D group was given donepezil 0.1 mg/kg per day.DHA-L group and DHA-H group were given 10 mg/kg and 20 mg/kg DHA per day,respectively.Group D,group DHA-L and group DHA-H were given intragastric administration once a day for 3 months.The changes of in cognitive behavior were measured by Morris experiment.HE staining was used to observe the arrangement and morphology of nerve cells in cerebral cortex,hippocampus and retina.The expressions of Aβ protein in cerebral cortex,hippocampus and retina were detected by immunohistochemistry.Western blotting detected the expression of autophagy related proteins(LC3-Ⅰ,LC3-Ⅱ,Beclin-1,P62,β-actin).Results The DHA-H group and the D group exhibited more frequent adoption of both linear and trending exploration routes.Compared to the model group,significant differences in the contents of Aβ in the hippocampal CA1,cerebral cortex S1,and retinal were observed(P＜0.0001)in the other four groups.The analysis also showed significant differences in autophagy-associated proteins between the DHA-L,DHA-H,and model groups(P＜0.01).Conclusion DHA improves cognitive function and increases the number of nerve cells in mice.It also reduces Aβ content in the cerebral cortex,hippocampus,and retina,along with improving autophagy-associated protein deposition in mice.

Objective:To compare the clinical characteristics, diagnostic plans, and treatment strategies of patients with combined burn-blast injuries caused by liquid plastic and liquid metal foreign objects in the body.Methods:This study was a retrospective cohort study. From January 2009 to July 2019, 41 patients with combined burn-blast injuries caused by hot solution explosion who met the inclusion criteria were admitted to the Department of Burns and Plastic Surgery of Qingdao Hospital of Rehabilitation University. The following indexes of all patients were collected, including gender, age, total burn area, admission time after injury, site of combined burn-blast injuries, and type of foreign objects in the body. According to the type of foreign objects in the body, the patients were divided into liquid plastic group (30 cases) and liquid metal group (11 cases). The following indexes of the two groups of patients were collected, including the clinical characteristics (swelling in the injury site, pain, fever, abscess formation, depth of injury, activity of foreign objects, and difficulty in removing foreign objects), imaging examinations (ultrasound, computed radiography, computed tomography, and magnetic resonance imaging examinations), treatment (repair period and repair method), and incidence of complications during follow-up after discharge.Results:There were 33 males and 8 females among the patients, aged 18-65 years. The total burn area was 1% to 78% total body surface area, the admission time after injury was 2 h to 7 d, the combined burn-blast injuries mainly occurred in the limbs and trunk, and the foreign objects in the body were liquid plastics (polyethylene and acrylonitrile butadiene styrene) and liquid metals (liquid iron and aluminum). The proportions with swelling in the injury site, injury with depth to the bone, poor mobility of foreign objects, and difficulty in removing foreign objects in patients in liquid plastic group were significantly higher than those in liquid metal group ( P<0.05). The proportions of confirming foreign objects in the body through computed radiography and computed tomography examinations in patients in liquid metal group were 7/7 and 8/8, respectively, which were significantly higher than 1/5 and 3/20 in liquid plastic group ( P<0.05); the proportion of confirming foreign objects in the body through ultrasound examination in patients in liquid metal group was 11/11, which was similar to 24/26 ( P>0.05); the proportion of confirming foreign objects in the body through magnetic resonance imaging examination in patients in liquid metal group was 2/2, which was the same as 4/4 in liquid plastic group. The proportions of patients in liquid plastic group who underwent stage Ⅰ wound repair and direct suture were significantly lower than those in liquid metal group ( P<0.05), while the proportions of patients who underwent delayed wound repair, skin grafting, and flap grafting were significantly higher than those in liquid metal group ( P<0.05). There was no statistically significant difference in the incidence of complications between the two groups of patients during follow-up after discharge ( P>0.05). Conclusions:Combined burn-blast injuries could result in damages of different severity in patients due to different types and locations of foreign objects in the body. Computed radiography and computed tomography examinations can be used to diagnose metal foreign objects in the body, while ultrasound and magnetic resonance imaging examinations can be used to diagnose plastic foreign objects in the body. Multidisciplinary collaboration and comprehensive treatment are important means of treating this type of patients.

Currently the main treatment of acute myeloid leukemia (AML) is chemotherapy combining hematopoietic stem cell transplantation. However, the unbearable side effect of chemotherapy and the high risk of life-threatening infections and disease relapse following hematopoietic stem cell transplantation restrict its application in clinical practice. Thus, there is an urgent need to develop alternative therapeutic tactics with significant efficacy and attenuated adverse effects. Here, we revealed that umbilical cord-derived mesenchymal stem cells (UC-MSC) efficiently induced AML cell differentiation by shuttling the neutrophil elastase (NE)-packaged extracellular vesicles (EVs) into AML cells. Interestingly, the generation and release of NE-packaged EVs could be dramatically increased by vitamin D receptor (VDR) activation in UC-MSC. Chemical activation of VDR by using its agonist 1α,25-dihydroxyvitamin D3 efficiently enhanced the pro-differentiation capacity of UC-MSC and then alleviated malignant burden in AML mouse model. Based on these discoveries, to evade the risk of hypercalcemia, we synthetized and identified sw-22, a novel non-steroidal VDR agonist, which exerted a synergistic pro-differentiation function with UC-MSC on mitigating the progress of AML. Collectively, our findings provided a non-gene editing MSC-based therapeutic regimen to overcome the differentiation blockade in AML.

Objective:To explore the psychometric characteristics of the Chinese version of the health-related social capital scale.Methods:From March to May 2020, after the original scale was translated into Chinese following the Brislin improved translation model, 251 community-dwelling senior citizens aged 65 and above were selected by convenient sampling method. Data analysis was conducted using SPSS 22.0 and AMOS 22.0, including tests of significance, correlation analysis, exploratory factor analysis, and confirmatory factor analysis.Results:Exploratory factor analysis extracted three factors: social participation, social cohesion, and reciprocity, which accounted for a cumulative contribution rate of 61.72%. Confirmatory factor analysis showed that the three-factor model fitted well(χ 2/ df=1.22, RMSEA=0.04, CFI=0.98, GFI=0.93, IFI=0.98, TLI=0.97). Social capital was significantly correlated with perceived social support positively ( r=0.36, P<0.01), and with loneliness negatively ( r=-0.30, P<0.01). The three factors were significantly correlated with the total scale ( r=0.85, 0.50 and 0.52, respectively, all P<0.01). And correlations between the items of each factor were 0.24-0.55, 0.30-0.59, 0.44-0.70, respectively(all P<0.01). The Cronbach's α coefficients of the total scale and three factors were 0.74, 0.72, 0.65 and 0.62, respectively(all P<0.01), and their retest reliability were 0. 92, 0. 87, 0. 82 and 0. 96, respectively(all P<0.01). Conclusion:The Chinese version of health-related social capital scale conforms to the three-factor model with good reliability and validity, which can be used to assess the social capital status of community-dwelling older adults in China.

Objective:To explore the epidemiological characteristics of patients with electrical burn at different voltages complicated by cerebral trauma, so as to provide a basis for improving the treatment level of such injury.Methods:A retrospective cohort study was conducted to analyze the clinical data of 480 patients with electrical burn complicated by cerebral trauma treated in Qingdao Municipal Hospital affiliated to Qingdao University from January 2001 to December 2019. According to the voltage intensity, the patients were divided into low voltage group (injury voltage<1 kV, n=295) and high voltage group (injury voltage≥1 kV, n=185). Gender, age, status of burn and other general data of all patients were collected. The clinical manifestations, consciousness [Glasgow coma scale (GCS)], imaging findings, treatment, prognosis [Glasgow outcome scale (GOS)] and complications were compared between the two groups. Results:(1) Gender and age: the male to female ratio was 5.4∶1.0; the peak age of onset occurred at 18-60 years, accounting for 302 patients (62.9%); the status of burn: the burn area ranged from 1%-78% [(20.0±4.0)%] total body surface area (TBSA), with the current outlet located at the head in 321 patients. (2) Clinical manifestations: consciousness disorders accounted for the highest proportion, with 295 patients (100%) in low voltage group and 185 patients (100%) in high voltage group, followed by headache which occurred in 178 patients (60.3%) in low voltage group and 115 patients (62.2%) in high voltage group (all P>0.05). (3) Consciousness: 37 patients presented coma, with 17 patients (5.8%) in low voltage group and 20 patients (10.8%) in high voltage group ( P<0.05). (4) Imaging findings: CT and MRI examination found cerebral edema, skull fracture, intracranial hematoma, cerebral ischemia, subarachnoid hemorrhage, and other positive lesions. In patients with head wounds (current inlet and outlet located in the head), the incidence of cerebral trauma was 44.0% in low voltage group and 86.8% in high voltage group ( P<0.05). In patients with no head wound (the current outlet was not located in the head), the incidence of cerebral trauma was 5.3% in low voltage group and 6.3% in high voltage group ( P>0.05). In contrast with the patients without current outlet locating in the head, there were three more types of cerebral trauma in patients with current outlet locating in the head, including skull fracture, intracranial hematoma and subarachnoid hemorrhage. (5) Treatment, prognosis and complications: 478 patients (99.6%) received non-surgical treatment and 2 patients (0.4%) received surgical treatment. There was 1 death (0.2%) and 479 successfully treated patients (99.8%). The prognosis was good in 280 patients (94.9%), moderately disabled in 13(4.4%) and severely disabled in 2(0.7%) in low voltage group; while the prognosis was good in 143 patients (77.3%), moderately disabled in 30(16.2%), severely disabled in 11(5.9%) and death in 1(0.5%) in high voltage group (all P<0.01). After discharge, the incidence of numbness, paresthesia and anxiety was significantly higher in low voltage group than that in high voltage group (all P<0.01). Conclusions:Male patients with electrical burn complicated by cerebral trauma are more than female patients, with the young and middle-aged population being at high risk. Disturbance of consciousness and headache are the main clinical manifestations. The incidence of high voltage coma is relatively higher. Compared with low voltage-induced electrical burn, the patients with high voltage-induced electrical burn complicated by cerebral trauma (current inlet and outlet located at the head) sustain more severe and extensive injury. Early and active CT or MRI examination is conducive to definite diagnosis. Non-surgical treatment is the main treatment. Compared with high voltage-induced electrical burn, the patients with low voltage-induced electrical burn complicated by cerebral trauma have significantly better prognosis, but are more likely to develop complications of numbness, paresthesia and anxiety.