RESUMO
Objective:To investigate the feasibility of reducing the radiation dose on coronary artery calcium score (CS) of virtual non-contrast (VNC) scanning in dual-layer spectral coronary CT angiography(CCTA).Methods:One hundred and twenty-two patients were examined on a dual-layer spectral detector CT scanner from March 2019 to August 2020. Volume CT dose index (CTDI vol), dose length product (DLP), effective dose ( E) were all evaluated for each patient. CS was calculated from both true non-contrast (TNC) and VNC images for left anterior descending (LAD), left circumflex (LCx), right coronary artery (RCA), and the total coronary artery (Total) by two radiologists independently. Pearson′s correlation coefficient was calculated for measuring the association between variables. The correction coefficients of each branch (λ LAD, λ LCx, and λ RCA) and the average correction coefficient (λ AVG) of the total coronary artery were obtained. The calibrated calcium score (CCS_VNC) was equal to λ multiplied by CS_VNC. The CS_TNC and CCS_VNC were compared using repeated oneway analysis of variance test. Correlation analyses for CS_TNC and CCS_VNC and agreement evaluation with Bland-Altman-Plots were performed. Results:The average effective doses in TNC, CCTA and total group were 0.69, 6.47 and 7.16 mSv, respectively. The effective dose was reduced by 10.6% and the scan time was reduced by 39% while using VNC images. There were significant differences among the CS_TNC and CS_VNC of LAD, LCx, RCA and Total ( t=6.75, 5.33, 4.99, 6.60, P< 0.05). Excellent correlations were observed between CS_VNC and CS_TNC ( R2 values were 0.929, 0.896, 0.958, and 0.918; λ values were 2.18, 1.18, 2.15, and 2.07, respectively). There were no significant statistically difference among the CS_TNC, CCS_VNC AVG, and CCS_VNC LAD/RCA of the LAD and RCA (all P> 0.05). The difference was statistically significant among the CS_TNC, CCS_VNC AVG, and CCS_VNC LCx of the LCx ( F=10.94, P<0.05). The paired comparison were performed in groups and the differences were statistically significant between the CS_TNC versus CCS_VNC AVGand CCS_VNC AVG versus CCS_VNC LCx ( t=3.31, 3.43, all P<0.05). There was no significant statistically difference between the CCS_VNC LCx and CCS_VNC AVG( P>0.05). Conclusions:It was feasible to accurately evaluate the CS_VNC from spectral data in comparison to TNC imaging, and to reduce the patient radiation dose and acquisition time.
RESUMO
Objective@#To analyze the absorptive radiation dose of non-target sensitive organs under the NewTomVGi oral and maxillofacial cone-beam CT scanning in different view fields.@*Methods@#The thermoluminescence dosimeter chip was placed in the non-target sensitive organ of the simulated radiology head model, and 6 scanning fields were measured and analyzed (standard resolution: scanning range was 15 cm×15 cm, 15 cm×12 cm, 12 cm×8 cm, 8 cm×8 cm respectively). High definition resolution: the radiation absorption dose of thermoluminescence with the scanning range of 12 cm×8 cm, 8 cm×8 cm, respectively.@*Results@#Under the same resolution, the absorptive dose increased with the expansion of scanning field, and the amount of absorbent during high resolution scanning was higher than that during the standard resolution with the same scanning field.@*Conclusions@#New TomVGi oral and maxillofacial cone-beam CT has sighificant difference in radiation dose in different view fields. The appropriate view field should be selected according to the patient′s clinical needs, so as to reduce unnecessary radiation dose during medical imaging examination.
RESUMO
Objective To explore the relationship of sevoflurane neurotoxicity with the expres-sion of Bid,Bim,Puma.Methods The cortical neuron from newborn SD rat (within 24 h)were see-ded in 6 or 12 well plate,and then randomly divided into 4 groups.Rat culture cortical neurons in vitro exposed in 1%,2%,4% and 0% sevoflurane for 6h were divided into A,B,C and D group. The effect of neuron viability,death and apoptosis were assessed using CCK-8,LDH and caspase-3 cleavage 1 7kDa expression assay.The expressions of Bid,Bim and Puma were assessed by western blot.Results Compared with group D, there were significant increases of neuron death and apoptosis,but a decrease of neuron viability,and upregulated expressions of Bid,Bim and Puma in group B (P <0.05);Compared with group B,Group C had increased death and apoptosis and de-creased viability of neurons,as well as upregulated expressions of Bid,Bim and Puma (P <0.05 ). Conclusion Along with the increase of the concentration,sevoflurane neurotoxicity was increased by upregulation of Bid,Bim,Puma expression.
RESUMO
OBJECTIVE:To observe the efficacy and safety of aerosol inhalation recombinant human interferon α1b in the treat-ment of bronchiolitis in children. METHODS:60 children with bronchiolitis were randomly divided into low-dose group,high-dose group and control group. All children were given tracheal suctioning,phlegm dispersing and other symptomatic treatment. Based on it,low-dose group was given recombinant human interferon α1b 1-2 μg/(kg·times),adding into 3 ml 0.9% Sodium chloride injec-tion,compression aerosol inhalation,twice a day;high-dose group was given recombinant human interferon α1b 3-4 μg/(kg·times), adding into 3 ml 0.9% Sodium chloride injection,compression aerosol inhalation,twice a day;control group was given ribavirin 10-15 mg/(kg·d),adding into 5% Glucose injection at ratio of 1∶1 by intravenous infusion,once a day. The treatment course for all groups was 5-7 d. Clinical efficacy,disappearance time of cough,respite,rale and three depressions,hospitalization time and incidence of adverse reactions in all groups were observed. RESULTS:Disappearance time of cough,respite,rale and three depres-sions and hospitalization time in high-dose group were significantly shorter than low-dose group and low-dose group shorter than control group,the differences were statistically significant(P<0.05). Total effective rate in high-dose group was significantly high-er than low-dose group and low-dose group higher than control group,the differences were statistically significant (P<0.05). There were no obvious adverse reactions during treatment. CONCLUSIONS:Based on conventional treatment,both efficacy and safety of aerosol inhalation recombinant human interferonα1b in the treatment of bronchiolitis in children are good.
RESUMO
<p><b>OBJECTIVE</b>The aim of this study is to investigate the effects of cardiac integrin-linked kinase (ILK) overexpression in a rat model of doxorubicin-induced heart failure and the underlying mechanisms.</p><p><b>METHODS</b>Rat heart failure model was induced by intraperitoneal administration of doxorubicin (6 injections within 2 weeks: total dose = 15 mg/kg). Five weeks after the first injection, rats with heart failure were confirmed by echocardiography and then randomly divided into Ad-ILK group (intra-myocardial injected with adenoviral vector expressing ILK) and Ad-null group (intra-myocardial injected with empty ad-null, n = 20 each). After 4 weeks, ILK expression and activity were detected by Western blot, cardiac function was determined by echocardiographic and hemodynamic examinations. Apoptosis was measured by TUNEL analysis and cardiomyocyte proliferation was estimated by phospho-histone-H3 staining.</p><p><b>RESULTS</b>Western blot analysis revealed higher expression of ILK as well as the phosphorylation levels of Akt in Ad-ILK hearts as compared with ad-null controls. Four weeks after transfection, LVEF and LVFS were significantly higher in Ad-ILK group as compared with control group [LVEF: (60.56 ± 2.61)% vs. (51.94 ± 2.28)%, P < 0.05; LVFS: (28.10 ± 1.83)% vs. (22.82 ± 1.68)%, P < 0.05]. The LVEDD and LVESD, as well as LVEDP were significantly lower in Ad-ILK group compared with control group [LVEDD: (6.22 ± 0.24) mm vs. (7.15 ± 0.21) mm, P < 0.05; LVESD: (4.42 ± 0.23) mm vs. (5.65 ± 0.25) mm, P < 0.05; LVEDP: (12.96 ± 2.10) mmHg vs. (21.45 ± 2.48) mmHg (1 mmHg = 0.133 kPa) , P < 0.05]. Reduced levels of serum BNP was also seen in the Ad-ILK group. TUNEL analysis showed that ILK treatment significantly inhibited the apoptosis of cardiomyocytes [(0.23 ± 0.02)% vs. (0.45 ± 0.04)%, P < 0.05]. Moreover, increased cardiomyocyte proliferation was found in Ad-ILK group through the phospho-histone H3 staining [(0.60 ± 0.07)% vs. (0.24 ± 0.03)%, P < 0.01].</p><p><b>CONCLUSION</b>ILK gene therapy improves cardiac function in this rat model of heart failure, and is associated with reduced apoptosis and increased cardiomyocyte proliferation.</p>
Assuntos
Animais , Masculino , Ratos , Adenoviridae , Genética , Apoptose , Proliferação de Células , Modelos Animais de Doenças , Doxorrubicina , Coração , Insuficiência Cardíaca , Metabolismo , Terapêutica , Miócitos Cardíacos , Metabolismo , Patologia , Proteínas Serina-Treonina Quinases , Genética , Metabolismo , Ratos Sprague-Dawley , TransfecçãoRESUMO
Objective: To observe the effect of amlodipine on bone marrow endothelial progenitor cell (EPC) mobilization, neo-vascularization and cardiac function in diabetic rats after myocardial infarction (MI) with the possible mechanisms. Methods: A total of 60 male SD rats were divided into 2 groups. Normal group, n=20. Diabetic group, n=40, the rats were fed with high fat diet (HFD) for 4 weeks and then received streptozotocin followed by left anterior descending coronary artery ligation to establish MI model, those rats were further divided into 2 sub-groups:Control group, the rats received sodium carboxymethylcellulose 1 ml/day with HFD and Treatment group, the rats received amlodipine 2 mg/kg/day with HFD, n=20 in each sub-group, all animals were treated for 4 weeks. The EPC level in peripheral blood CD45-/low+/CD133+/KDR+ at before and 1, 3, 5, 7, 14, 28 days after operation were examined by lfow cytometry, plasma vascular endothelial growth factor (VEGF) level was measured by ELISA, capillary density in MI area was determined by CD31 staining, EPC related protein expressions were detected by western blot analysis and the cardiac function was evaluated by echocardiography. Results: EPC in CD45-/low+/CD133+/KDR+in Treatment group at 7 days after operation was increased than Control group at 5 days after operation (112 ± 30/106) vs (55 ± 10/106), plasma VEGF in Treatment group was higher than Control group (5.63 ± 1.33) ng/L vs (3.68 ± 0.98) ng/L; Treatment group presented increased expressions of protein kinase B, endothelial nitric oxide synthase (eNOS) and matrix metallopeptidase-9, increased capillary density in MI area, higher LVEF and left ventricular fractional shorting, all P Conclusion: Amlodipine improves EPC mobilization, neo-vascularization and cardiac function in diabetic-MI rats, it may be related to VEGF/eNOS cascade activation.
RESUMO
Objective Using a mouse hind limb ischemia model,we compared the ischemia-induced angiogenesis between diabetic and non-diabetic mice,and the effects aminoguanidine,an inhibitor of advanced glycation end products (AGEs),on angiogenesis in diabetic mice.Methods Experimental diabetic models were induced by injected with streptozotocin (STZ)[40 mg/(kg?d),Ip] in C57BL/6 mice.Two weeks after the establishment of diabetic model,diabetic mice were randomly to receive placebo(n=61)or aminoguanidine[200 mg/(kg?d) gavage,n=61) for 8 weeks.Tissue ischemia was obtained by ligation of left femoral artery.Capillary density was determined in the ischemic and non-ischemic limbs by CD31 staining at days 0,1,3,7,14 and 28 post-operatively.Results Compared with non-diabetic controls,diabetic mice had reduced microvascular density[(6.92?0.85) vs (9.21?1.64)/HP,P