中老年听力障碍者助听器验配特点

目的通过123例50岁以上听力障碍患者的纯音听阈测试及助听器验配情况,了解其听力特点及助听器选配的特点。方法感音神经性聋患者123例,以每10岁为一年龄组,统计他们125～8000Hz的纯音听阈,根据听力情况验配西门子数字式助听器,记录最终验配情况并了解未验配的原因。结果各年龄段就诊的中老年聋者总体听力水平大致相仿,均为中重度感音神经性聋,纯音听阈测试表现为下降型听阈曲线。就诊者以70～岁年龄段者最多,最终接受助听器者以70岁以下年龄段者为多。70岁以上者多因戴上助听器后效果不理想或经济原因拒绝验配,70岁以下拒绝验配者则主要担心社会影响。结论中老年感音神经性聋患者的纯音听阈曲线主要为下降型,早诊查、早干预有助于提高生活质量。     

不同听力检测方法对早期发现噪声性隐性听力损失的意义

目的探讨扩展高频纯音测听、畸变产物耳声发射(DPOAE)及噪声下言语识别能力测试对早期发现噪声性隐性听力损失的意义。方法选取20例常频纯音听阈正常、有噪声接触史的工人(接噪组,年龄20~41岁)与20例无噪声接触史、常频听阈正常的青年人(对照组,年龄19~35岁),分别行扩展高频纯音测听、扩展高频DPOAE及噪声下言语识别能力测试(汉化版噪声下BKB语句测试),记录并比较两组各项测试结果。结果接噪组扩展高频纯音听阈检出率低于对照组,在16 kHz差异有统计学意义(P<0.05),在18、20 kHz差异有显著统计学意义(P<0.01);接噪组8~20 kHz扩展高频纯音听阈平均值高于对照组,在9、18 kHz差异有统计学意义(P<0.05),在14 kHz差异有显著统计学意义(P<0.01);接噪组扩展高频DPOAE的信噪比及幅值均较对照组降低,在10 kHz差异有统计学意义(P<0.05),在8、9 kHz差异均有显著统计学意义(P<0.01);噪声下言语识别能力测试显示接噪组信噪比损失平均值为4.6±2.19 dB,高于对照组(3.00±2.08 dB)(P<0.01)。结论接噪组相较对照组,扩展高频纯音听阈值升高或引不出,扩展高频DPOAE信噪比及幅值降低,噪声下言语识别能力显著下降,以上三种检测方法对早期发现噪声性隐性听力损失有一定的参考价值。     

A Novel Formulation of VIP in Sterically Stabilized Micelles Amplifies Vasodilation In Vivo

Purpose. To determine whether human vasoactive intestinal peptide (VlP)-poly(ethylene glycol) (PEG)-grafted distearoyl-phosphatidyleth-anolamine (DSPE) micelles elicit potent and stable vasodilation in vivo. Methods. PEG-DSPE micelles were prepared by co-precipitation. VIP was loaded into micelles by incubation at room temperature. Vasoactivity of VIP in SSM was determined by monitoring changes in diameter of resistance arterioles in the in situ hamster cheek pouch using intravital microscopy. Results. VIP easily undergoes self-assembly into small PEG-DSPE micelles (mean [±SEM] size, 18 ± 1 nm) in a time-dependent fashion. This generates a potent vasoactive matrix at nanomole concentrations of VIP as manifested by ~3-fold potentiation and prolongation of vasodilation relative to that evoked by aqueous VIP alone (p < 0.05). This response is specific and mediated by the L-arginine/nitric oxide (NO) biosynthetic pathway. Micellar VIP dispersion remains vasoactive for at least 14 days after preparation and storage at 4°C. Conclusions. A novel, self-associated, small and stable PEG-DSPE micellar formulation of VIP amplifies vasodilation in the in situ peripheral microcirculation in a specific fashion by elaborating NO. An optimized formulation could be considered for certain cardiovascular disorders associated with L-arginine/NO biosynthetic pathway dysfunction.     

Establishment of carcinoma cell lines from larynx and submandibular gland

Summary For many techniques in the oncology of head and neck tumors large amounts of pure tumor cells are required.Although larynx and salivary gland tumors are common in man, no report exists on isolation and purification of tumor cells of which malignancy was proved.The present paper describes in vitro cultivation of living human malignant tumor cells from a larynx and a submandibular gland carcinoma. Carcinoma cells were freed from all non-tumor cells and cloned thus indicating that cultures contained only a single cell type. Transplantation of grown cells s.c. into athymic (nu/nu) mice induced rapidly growing tumors of which malignancy was demonstrated by histology.Dedicated to Prof. Dr. L. Seiferth on the occasion of his 80th birthday     

Shopping addiction: A preliminary investigation among Maltese university students

This article seeks to explore whether compulsive buying may be conceived of as a behavioural addiction and to identify compulsive buying's potential ability to regulate mood. Utilising a screened sample (from an original random sample of 400) of Maltese university students identified through standardised tools as compulsive shoppers, the article explores compulsive buying's parallels with other addictions and focusses on conceptualising the phenomenon as an attempt to manipulate hedonic tone. The method adopted is a sequential transformative strategy and is primarily qualitative although some quantitative work is engaged in to recruit a number of participants for in-depth interviewing. The goal is to contribute to the changing shape of the addiction field. The empirical data indicates that compulsive buying holds the same elements as behavioural addictions identified in the extensive literature on the subject. Furthermore, it was found that compulsive buyers often use shopping as a means of mood elevation. Pleasurable feelings associated with shopping seem to mask negative affect if only momentarily, thus perpetuating the compulsive buying cycle The heightened state experienced whilst shopping may be seen as a key motivating element of this addiction. Findings indicate that debt and financial instability were apparent negative consequences of the behaviour.     

Comparison of oral micro-adhesion on polyetheretherketone,zirconium dioxide,and pure titanium abutment北大核心

BACKGROUND: There are some aesthetic and biomechanical problems in the application of zirconium dioxide and pure titanium abutment in the anterior teeth area. A kind of aesthetic abutment material conforming to biomechanics needs to be studied urgently. OBJECTIVE: To compare the adhesion of Porphyromonas gingivalis and whole saliva on the surface of polyetheretherketone (PEEK), zirconium dioxide (ZrO2), and pure titanium (Ti). METHODS: Specimens with the shape of a disk were prepared from PEEK, ZrO2, and Ti. The surface morphology feature was observed by scanning electron microscope. Surface roughness was determined by atomic force microscope. Contact angle was measured using contact angle measuring instrument. The adhesion force of Porphyromonas gingivalis on the surface of materials was measured using an atomic force microscope probe. The initial bacterial adhesion on materials in the suspension of Porphyromonas gingivalis and whole saliva was evaluated by scanning electron microscope and Cell Counting Kit-8 assay. RESULTS AND CONCLUSION: (1) Scanning electron microscope showed that the surface of the PEEK and Ti specimen was grooved, and the groove of PEEK was more than that of Ti, and there were a few microholes on the surface of ZrO2. Atomic force microscopy showed that parallel groove undulations were observed on the surfaces of the three specimens. The groove peak and valley structure of PEEK and ZrO2 was more prominent than that of Ti, and the porous concave and convex structure of the ZrO2 surface was more than that of PEEK. (2) The surface roughness of ZrO2 was greater than that of Ti (P < 0.05). The pairwise comparison between other groups showed no significant difference (P > 0.05). There was no significant difference between the contact angles of the three groups (P > 0.05). (3) A significantly lower adhesion force was identified for PEEK than for ZrO2 and Ti (P < 0.05). (4) The results of scanning electron microscope observation showed that the bacterial adhesion on the PEEK surface was the least, while that on the Ti surface was the most. The Cell Counting Kit-8 assay result showed that the initial bacterial adhesion on the surface of PEEK was significantly lower than that on the surface of ZrO2 and Ti (P < 0.05). (5) The results suggest that PEEK has more advantages to inhibit initial bacterial adhesion than conventional abutment materials such as ZrO2 and Ti. © 2022, Publishing House of Chinese Journal of Tissue Engineering Research. All rights reserved.     

应用纯音测听诊断职业性噪声聋的可靠性和有效性

对6年以上工龄的青年织布女工108人(216耳)连续二次纯音测听的资料表明:第一次和第二次的听阈均值差除个别频率(8KHz左耳为3.5dB)外,其余各频率都在-0.3～0.5dB范围内;最大标准差于2KHz处为17.4dB,在3KHz和8KHz处分别为18.5dB、20.1dB。据此认为一次纯音测听的记录可作为职业性噪声聋诊断和评价听力损失程度的初步依据,必要时可用阻抗计测试镫骨肌反射阈和听觉脑干诱发反应测听以排除中耳疾患和非器质性聋。2例女工脱离噪声环境疗养2周,每隔一周复查听力一次,结果三次测听的语频均值出现21.7和13.3dB的差值,考虑系暂时性阈移的恢复。作者们对1980年卫生部门颁发的“噪声性聋调查方法”提出了改进意见。     

Continuous Abnormal Fetal Breathing in the Human Fetus Associated with Severe Perinatal Asphyxia

We present a case of continuous abnormal fetal breathing which was associated with a severely asphyxiated neonate. The period of apnea was fixed at approximately 3 s and the breathing activity consisted of a single inspiratory and expiratory movement. The depth of each breath appeared similar. No movement or tone was observed. This “picket fence” fetal breathing pattern, which has been described in fetal lambs as a preterminal event, has not been reported previously in humans.     

胡柚皮黄酮诱导自噬抑制肝细胞脂肪变性的作用研究

目的 观察胡柚皮黄酮对棕榈酸诱导的肝细胞脂肪变性的影响。方法 棕榈酸诱导HepG2细胞脂肪变性，不同浓度胡柚皮黄酮干预后，采用油红O染色法观察肝细胞脂肪变性；荧光探针法观测细胞内活性氧水平及线粒体膜电位变化；免疫印迹法检测Beclin-1、LC3及P62蛋白表达。结果 棕榈酸诱导后，HepG2细胞内脂滴和活性氧含量明显增高；胡柚皮黄酮处理后，细胞内脂滴和活性氧均明显降低，线粒体膜电位恢复，LC3和Beclin-1蛋白表达上调，P62蛋白表达下调。结论 胡柚皮黄酮能改善肝细胞脂肪变性和氧化应激反应，机制可能与其调控线粒体自噬，维持线粒体功能稳定有关。