摘要
An intensive breast array sensor was designed based on three-dimensional electrical impedance tomography in this work.Firstly,an electrical impedance sensor for detection of breast cancer was developed.The sensor adopted the integrated design of excitation electrode array and ground electrode to achieve structural simplification.It realized electric field densification through conical matrix and double-layer circumferentially arranged electrode array and improved the detection accuracy of target object through taper optimization.Secondly,the imaging system was designed,and the sensor was optimized by numerical simulation.The simulation results showed that halving the number of electrodes did not affect imaging accuracy of the sensor,but could improve the imaging speed.Finally,the performance of the sensor was verified by experiment.The signal-to-noise ratio and channel consistency of the system were at a good level.The sensor was used to reconstruct three-dimensional image of the experimental model with relative volume of the detection field of 0.4%.The image correlation coefficient of the single target imaging was above 0.6 and the position of the double target object could be clearly identified,and thus the visual detection of breast cancer was realized.
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BACKGROUND:Obesity has become a global health issue,often accompanied by complications including obesity-related muscle atrophy.While exercise has been reported to improve various obesity-related diseases,there is limited research focusing on exercise modes. OBJECTIVE:To compare the effects of moderate-intensity continuous training(MICT)and high-intensity interval training(HIIT)on obesity-related muscle atrophy in mice under the premise of the same exercise distance,providing a scientific basis for exercise interventions for obesity-related muscle atrophy. METHODS:Seventy-two male C57BL/6 mice were divided into six groups(n=12 per group):standard chow diet,standard chow diet+MICT,standard chow diet+HIIT,high-fat diet,high-fat diet+MICT,and high-fat diet+HIIT.The study evaluated the effects of 8-week treadmill training with different exercise modes on long-term high-fat diet-induced muscle atrophy by detecting muscle mass,muscle index,muscle fiber cross-sectional area,muscle lipid deposition,and the expression of muscle atrophy marker genes Murf-1 and Atrogin-1 in the gastrocnemius muscle of mice exposed to long-term high-fat diet. RESULTS AND CONCLUSION:Compared to the high-fat diet group,both MICT and HIIT improved the decrease in gastrocnemius muscle index(MICT+18.8%vs.HIIT+17.6%,not significant between the two modes),muscle fiber atrophy(MICT+15.5%vs.HIIT+13.7%,not significant between the two modes),and muscle lipid deposition(MICT-19.8%vs.HIIT-17.1%,not significant between the two modes).At the gene level,compared with the high-fat diet group,both MICT and HIIT could significantly down-regulate the expression of Murf-1(MICT-62.4%vs.HIIT-52.6%,the down-regulation caused by MICT was significantly greater than that by HIIT;P＜0.01)and Atrogin-1(MICT-43.3%vs.HIIT-29.8%,the down-regulation caused by MICT was significantly greater than that by HIIT;P＜0.01).Based on exercise mode comfort and genetic evidence,MICT mode might be more suitable for exercise interventions in obesity-related muscle atrophy.
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OBJECTIVE@#To study the accuracy of 3D printing implant-guided anterior tooth implantation under flap or flapless surgery.@*METHODS@#Twenty-one cases (32 teeth) with missing teeth were divided into two groups: tooth implantation on the maxillary models under flap surgery (FP group) and tooth implantation on the maxillary models under flapless surgery (FPS group). A dental implant guide was designed and used in the two groups. The actual position of the dental implants in the two groups was compared with the preplanned deviation values of implant top, bottom, vertical distance, and angle deviation. SPSS 19.0 software was used for statistical analysis.@*RESULTS@#The deviation values of implant top, bottom, vertical distance, and angle were significantly lower in the FP group than in the FPS group (P<0.05).@*CONCLUSIONS@#High accuracy of tooth implantation can be realized by using the 3D printing implant guide. The different surgical methods influence the precision of tooth implantation. Clinicians can choose the surgery reasonably depending on the actual situation.
Subject(s)
Cone-Beam Computed Tomography , Dental Implantation, Endosseous , Dental Implants , Printing, Three-Dimensional , Tooth摘要
Objective To evaluate the effects of different fluid therapy protocols on postoperative nausea and vomiting (PONV) in pediatric patients undergoing ambulatory surgery.Methods A total of 160 pediatric patients,of American Society of Anesthesiologists physical status Ⅰ or Ⅱ,aged 3-7 yr,weighing 14-24 kg,with body mass index ＜30 kg/m2,undergoing elective lower abdominal ambulatory surgery,were randomized into Ⅰ and Ⅱ groups (n=80 each) using a random number table method.Lactated Ringer's solution 10 ml · kg-1 · h-1 and 30 ml · kg-1 · h-1 were intravenously infused in group Ⅰ and group Ⅱ,respectively.Ibuprofen 20 mg/kg was given orally after operation to maintain Face Legs Activity Cry Consolability score ＜4.The development of PONV and thirst and requirement for antiemetics was recorded within 24 h postoperatively.The time of first PONV,time of first thirst and score for satisfaction of family members were also recorded.Results Compared with group Ⅰ,the incidence of PONV and thirst was significantly decreased,the time of first requirement for antiemetics and time of first thirst were prolonged,and the score for satisfaction of family members was increased (P＜ 0.05),and no significant change was found in the requirement for antiemetics in group Ⅱ (P＞0.05).Conclusion Intravenously infusing fluid 30 ml · kg-1 · h-1 can decrease the occurrence of PONV when compared with intravenously infusing fluid 10 ml · kg-1 · h-1 in pediatric patients undergoing ambulatory surgery.
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Objective To determine the minimum alveolar concentration (MAC) of sevoflurane in Chinese neonates.Methods Thirty ASA Ⅰ or Ⅱ neonates,aged ≤ 28 days,with normal body weight,scheduled for elective surgery under general anesthesia,were enrolled in the study.Anesthesia was induced with inhalation of 6.00％ sevoflurane in oxygen.The infants were tracheal intubated and mechanically ventilated.The inhaled concentration of sevoflurane was adjusted to achieve the preset end-tidal concentration and maintained at this level for 20 min.Skin incision was then performed.The concentration of sevoflurane was determined by modified Dixon's up-and-down method.The initial end-tidal concentration of sevofluren was 3.00％.Each time the concentration increased/decreased by 0.25 ％ in the next infant according to the infant's response.Successful skin incision was defined as no body movement during skin incision.The MAC,ED95 and 95 ％ confidence interval of sevoflurane were calculated using logistic regression analysis.Results The MAC and ED95 (95 ％ confidence interval) of sevoflurane required for successful skin incision were 2.82％ (2.66％-2.98％) and 3.39％ (2.89％-3.89％),respectively,in neonates.Conclusion The MAC of sevoflurane is 2.82 ％ in Chinese neonates and lower than the present reference values previously described in foreign reports.
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Objective To investigate the effects of chin lift on the patency of upper airway in normal conscious adults using magnetic resonance imaging (MRI).Methods Sixteen healthy volunteers aged 21-35 yr with a body mass index of 17-26 kg/m2 were enrolled in this study.The subjects lay on their back with their heads slightly extended.The lower jaw was first left in standard position.The mouth was slightly open (the distance between the upper and lower incisors was 0.5 cm).The chin was then lifted upward.The upper airway (from the base of slull to the level of vocal cord) was scaned by MRI along the median sagital plane.The length of soft palate,root of tongue and epiglottis and the area of pharyngeal cavity were measured.The position of the rim of epiglottis was examined.The mean percentage changes induced by chin lift were calculated.Results Compared with standard position,chin lift significantly prolonged the length of soft palate,root of tongue and epiglottis and increased the area of pharyngeal cavity.The percentage change in the position of the rim of epiglottis was largest after chin lift.Conclusion Chin lift significantly improve the patency of the upper airway in conscious adult by changing the position of the rim of epiglottis and increasing the area of pharyngeal cavity.
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Objective To investigate the role of nuclear factor-kappa B (NF-κB)signaling pathway in propofol-induced suppression of up-regulation of inducible nitric oxide synthase (iNOS) gene expression in LPSstimulated RAW264.7 cells.Methods RAW264.7 cells were purchased from cell bank of Chinese Academy of Sciences and cultured in DMEM culture medium containing 10％ fetal bovine serum.The cells were seeded in 6 cm diameter dishes (3 ml/dish) or in 6-well plates (2 ml/well) with a density of 5 × 105/ml and randomly divided into 3 groups ( n =18): normal control group (group C),group LPS (group L)and group LPS + propofol (group LP).The cells were incubated with LPS 1 μg/ml in groups L and LP.Propofol 50μmol/L was added to the culture medium at 2 h before LPS in group LP.Cells were harvested at 30 min after being stimulated with LPS.Phosphorylation of IκB kinase(p-IKK) and NF-κB activity were detected by Western blot.The expression of iNOS mRNA was determined after 6 h exposure of the cells to LPS.Results LPS significantly up-regulated the expression of p-IKK and iNOS mRNA and increased NF-κB activity in group L as compared with group C.Propofol pretreatment significantly attenuated the effects of LPS on p-IKK,iNOS mRNA expression and NF-κB activity.Conclusion NF-κB signaling pathway is involved in the propofol-induced suppression of up-regulation of iNOS mRNA expression in LPS-stimulated RAW264.7 cells.
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Objective To summarize the epidemiological feature of plague cases oceuwed in China.Methods The epidemiological and clinical data from 1981 to 2006 year in China were analyzed with descriptive study method.Result Nine hundred and seveneteen human plague cases were diagnosed in 9 provinces(regions) from 1981 to 2006 years,105 cases died,the mortality rate being 11.45%,and they distributed in 69 counties (cities or banners).In Qinghai Province 108 cases were diagnosed,the mortality rate was 46.30%(50/108),the cases distributed in 17 counties(cities);137 cans in Guizhou,distributing in 2 counties(cities);517 cases in Yunnan,distributing in 26 counties(cities).Plague cases peaked separately in 1983,1990,1996 and 2000 years,they were 25,75,98 and 254 separately.The principal spreading ways were breathing flying particles,touching,skinning and eating marmot in Qinghai;750 cases were of bubonic plague,among whom 4 cases in Tibet died,the fatality rate was 0.53(4/750);121 cases were of pneumonic prague,among whom 65 cases died,was accounting for 53.72%(65/121);31 cases were of septieaemic plague,and 30 cases died(one cases was cured in Inner Mongolia),accounting for 96.77%(30/31).Others were brain plague,intestinal plague,tonsil plague and plague cellulites,which were cured.Conclusion From 1990,human plague epidemical scope and intensity is enlarging continuously compared with 1980-1990 and there is a trend of going up gradually in China.