ObjectiveTo investigate the effect of triamcinolone acetonide (TA) with different dosage and excipient on retina.MethodsThirty-two purebred New Zealand white rabbits randomly divided into 4 groups underwent intravitreous injection with TA. Group 1:4 mg TA without excipient; group 2:25 mg TA without excipient; group 3:4 mg TA with excipient; group 4:25 mg TA with excipient. Electroretinography (ERG) was performed on each rabbit before intravitreal injection, 1 week, 1 and 2 months after the injection. All the animals were killed and the eyeballs were extirpated 2 months after the injection, and pathological examinations including light and electron microscopy were performed.ResultsNo significant difference was found in the latent period of ERG at the points of time before and after the injection in all the groups, but the amplitudes of ERG waves was lower in groups containing excipient than that before the treatment (Plt; 0.01). The results of light and electron microscopy showed damages of tissue or structures of retina in various degrees in groups containing excipient.ConclusionIntravitreous injection of TA with the dosage of ≤25 mg without excipient does no harm to the retinal configuration and function, and excipient may lead to the change of retinal configuration and function.(Chin J Ocul Fundus Dis, 2005,21:229-232)
Objective To investigate the relationship of resonant frequency and low frequency conductive hearing loss. Methods Eighty- four participants were included, and tested by gold standard and resonant frequency respectively. Receiver operator characteristic (ROC) curve was used to explore the most appropriate cutoff point for diagnosing low frequency conductive hearing loss and Levene’s test was used to test the difference of the low frequency conductive hearing loss and normal hearing groups. Results The resonant frequencies of low conductive frequency hearing loss and normal hearing groups were different. The optimum cutoff points of resonant frequency were 850Hz and 1 050Hz. The resonant frequency range from 850Hz to 1 050Hz was considered normal. The test was powerful when the resonant frequency was lower than 850Hz. The test was powerless when the resonant frequency was higher than 1 050Hz. Conclusions Conductive hearing loss could be predicted from resonant frequency when it is lower than 850Hz. The test is powerless when the resonant frequency is higher than 1 050Hz. The resonant frequency could be affected by many factors, so ENT (ear, nose and throat) doctors and audiologists have to be careful about how to explain the results when the resonant frequency is higher than 1 050Hz.
Simultaneous recording of electroencephalogram (EEG)-functional magnetic resonance imaging (fMRI) plays an important role in scientific research and clinical field due to its high spatial and temporal resolution. However, the fusion results are seriously influenced by ballistocardiogram (BCG) artifacts under MRI environment. In this paper, we improve the off-line constrained independent components analysis using real-time technique (rt-cICA), which is applied to the simulated and real resting-state EEG data. The results show that for simulated data analysis, the value of error in signal amplitude (Er) obtained by rt-cICA method was obviously lower than the traditional methods such as average artifact subtraction (P<0.005). In real EEG data analysis, the improvement of normalized power spectrum (INPS) calculated by rt-cICA method was much higher than other methods (P<0.005). In conclusion, the novel method proposed by this paper lays the technical foundation for further research on the fusion model of EEG-fMRI.
The issue of bacterial drug resistance has remained unresolved, and in recent years, biomimetic nanostructured surfaces inspired by nature have garnered significant attention due to their bactericidal properties demonstrated through mechanical mechanisms. This article reviewed the main research progress in the field of nanostructured mechanical bactericidal surfaces, including various preparation methods for nanostructured surfaces with mechanical bactericidal properties, as well as the basic mechanisms and related physical models of the interaction between bacteria and nanostructured surfaces. In addition, the application of nanostructured surfaces in biomedicine was introduced. Finally, the article proposed the major challenges faced by mechanical bactericidal research and the future development direction.
【摘要】 目的 了解慢性化脓性中耳炎患者的听力学检查特点。 方法 回顾性分析2005年8月—2008年12月间就诊的382例确诊为慢性化脓性中耳炎患者的听力学检查资料。 结果 慢性化脓性中耳炎中男性和单耳患者居多，任何年龄均可发病，以中度传导性听力损失为主，鼓室图形态各异，耳道容积变大。 结论 慢性化脓性中耳炎是常见的耳科疾病，需及时治疗，听力学检查对于指导治疗方案和评估预后意义重大。【Abstract】 Objective To learn the audiological characteristics of chronic suppurative otitis media patients. Methods We retrospectively analyzed the audiologic data of 382 patients diagnosed with chronic suppurative otitis media treated in our hospital from August 2005 to December 2008. Results The number of male chronic suppurative otitis media patients was more than female patients, and single ear infections are more than infections of both ears. The onset of the disease could be at any age. Most of the patients had a moderate conductive hearing loss. All kinds of tympanogram were found,and ear canal volume of the patients was enlarged. Conclusion Chronic suppurative otitis media is a common disease of the ear, which needs timely treatment, and audiological tests are important in guiding treatment plans and assessing prognosis.
ObjectiveTo observe the curative effect of pulmonary rehabilitation in patients with stable moderate to severe chronic obstructive pulmonary disease (COPD).MethodsSixty-four patients with stable moderate to severe COPD who visited during January 2016 and December 2017 were recruited in the study. They were randomly divided into an observation group and a control group, with 32 cases in each group. The spirometry was conducted in all patients. The right deep inspiratory end diaphragm thickness and the quiet end expiratory diaphragm thickness were measured by ultrasound, and the diaphragm thickness fraction (DTF) was calculated. The routine drug treatment was given in both groups. The comprehensive pulmonary rehabilitation treatment was given in the observation group (include breath training, exercise training, health education and nutrition guide). The pulmonary function, diaphragm function, severity and quality of life were evaluated before and 6 months later after the treatment.ResultsIn the observation group, the predicted value of forced expiratory volume in one second (FEV1%pred), FEV1/FVC ratio and DTF were all significantly improved compare with before treatment and the control group (all P<0.05). While the BODE index was significantly declined compare with before treatment and the control group (all P<0.05).ConclusionPulmonary rehabilitation treatment can help improve pulmonary function, diaphragm function, condition of the disease and quality of life.
目的 探讨前列腺体积＞60 mL的前列腺增生症患者的手术安全性，提高部分合并尿道狭窄前列腺增生症患者的手术实施率。 方法 2009年3月－2010年3月，行耻骨上膀胱穿刺引流下经尿道前列腺电切术（TURP）治疗前列腺增生58例。年龄54～93岁，平均72岁，病程8个月～12年，平均7.2年；前列腺体积35～128 mL，平均78 mL；国际前列腺症状评分24～35分，平均30.2分 ；最大尿流率1.2～4.8 mL/s，平均1.8 mL/s；残余尿量84～210 mL，平均160 mL。术前无尿潴留28例。 结果 58例顺利完成手术，其中2例伴包膜穿孔，9例前尿道狭窄者通过去外鞘电切镜完成手术。所有患者切除前列腺组织体积18～86 mL，平均58 mL；术中冲洗液为5%葡萄糖液，用量18 600～42 500 mL，平均23 500 mL；手术时间45～185 min，平均70 min。术后病理检查均示良性前列腺增生，术后住院时间3～8 d，平均5 d。术后患者最大尿流率为18～46 mL/s，平均32 mL/s。 结论 耻骨上膀胱穿刺引流能降低膀胱内压，减少水、糖分吸收，增加手术安全性，提高了部分合并前尿道狭窄的前列腺增生患者的手术几率。
ObjectiveTo systematically review the epidemiological characteristics and economic burden of traumatic spinal cord injury (SCI) in China.MethodsPubMed, EMbase, WanFang Data, VIP and CNKI databases were electronically searched to collect studies of the epidemiological characteristics and economic burden of SCI in China from January 1st, 1978 to August 30th, 2017. Two reviewers independently screened literature, extracted data and assessed the risk of bias of included studies, then, meta-analysis was performed by using Stata 12.0 software.ResultsA total of 32 studies were included. The results of meta-analysis showed that: the prevalence of SCI in China was 37 persons per million per year (95%CI 21 to 53), with the average age ranged from 34.7 to 54.4 years. Men had a higher risk of SCI than Women. Motor vehicle collisions (MVCs) and falls were the two main causes of SCI. The neurological injury levels were varied, ASIA grade A was the most common and grade E was the least.ConclusionCurrent evidence shows that there is a high prevalence of SCI in China with heavy social and medical burden. The main reason of SCI is motor vehicle collisions and falls. Due to limited quality and quantity of the included studies, more high-quality studies are needed to verify above conclusion.
ObjectiveTo assess the mortality, acute exacerbations, exercise capacity, symptoms and significant physiological parameters (lung function, respiratory muscle function and gas exchange) of patients with severe stable chronic obstructive pulmonary disease (COPD) with respiratory failure treated by noninvasive positive pressure ventilation (NPPV).MethodsA meta-analysis of randomized controlled trials was carried out by searching PubMed, Cochrane library, Embase, OVID, Chinese Biomedical Literature Database and the bibliographies of the retrieved articles up to February 2017. Studies of patients with severe stable COPD with respiratory failure receiving long-term noninvasive positive pressure ventilation and comparison with oxygen therapy were conducted, and at least one of the following parameters were reviewed: frequency of acute exacerbations, mortality, lung function, respiratory muscle function, gas exchange, 6-minute walk test.ResultsSix studies with 695 subjects met the inclusion criteria and were analyzed. The PaCO2 was significantly decreased in patients who received long-term NPPV. No significant difference was found between long-term NPPV and oxygen therapy in mortality, frequency of acute exacerbations, gas exchange, lung function, respiratory muscle function and exercise capacity. The subgroup analysis showed that NPPV improves survival of patients when it is targeted at greatly reducing hypercapnia.ConclusionCurrent evidence suggests that there is no significant improvement by application of NPPV on severe stable COPD with respiratory failure patients, but NPPV may reduce patients’ mortality with the aim of reducing hypercapnia.
In order to fully explore the neural oscillatory coupling characteristics of patients with mild cognitive impairment (MCI), this paper analyzed and compared the strength of the coupling characteristics for 28 MCI patients and 21 normal subjects under six different-frequency combinations. The results showed that the difference in the global phase synchronization index of cross-frequency coupling under δ-θ rhythm combination was statistically significant in the MCI group compared with the normal control group (P = 0.025, d = 0.398). To further validate this coupling feature, this paper proposed an optimized convolutional neural network model that incorporated a time-frequency data enhancement module and batch normalization layers to prevent overfitting while enhancing the robustness of the model. Based on this optimized model, with the phase locking value matrix of δ-θ rhythm combination as the single input feature, the diagnostic accuracy of MCI patients was (95.49 ± 4.15)%, sensitivity and specificity were (93.71 ± 7.21)% and (97.50 ± 5.34)%, respectively. The results showed that the characteristics of the phase locking value matrix under the combination of δ-θ rhythms can adequately reflect the cognitive status of MCI patients, which is helpful to assist the diagnosis of MCI.