超声波在医疗领域中的应用及分析例举

本文简要介绍了超声波的三个特点，并从诊断、治疗、辅助用途三方面论述了超声波在临床的普遍应用，其中重点介绍了三维超声成像技术。     

泰勒宁片和科洛曲片用于隆乳术后镇痛的比较

目的:评价泰勒宁片和科洛曲片对隆乳手术后疼痛的疗效和不良反应。方法:采用随机开放平行对照试验。共完成60例,其中A组30例予泰勒宁片,单次1片;B组30例予科洛曲片,单次1片。结果:泰勒宁片对隆乳手术后引起的中度或重度疼痛总有效率可达96.7%,科洛曲片的总有效率可达83.3%。服药后泰勒宁片组的疼痛强度差均高于科洛曲组,经统计学处理,有显著性差异(P<0.05)。不良反应发生率较科洛曲片组高。结论:泰勒宁片为中强度镇痛药,对于隆乳手术后引起的中重度疼痛有良好的镇痛效果。     

胫骨前肌疲劳时比目鱼肌诱发肌电图H波的变化及其机制探讨

为了解主动肌疲劳时拮抗肌脊髓运动神经元兴奋性变化的规律 ,本研究采用踝关节背屈运动形式 ,对胫骨前肌 (主动肌 )疲劳状态下的比目鱼肌 (拮抗肌 )诱发肌电图H波成分进行了观察。并以压迫阻断胫骨前肌Ⅰa类神经纤维传导的方法 ,对比目鱼肌H波变化机制进行了分析探讨。结果发现 :(1)胫骨前肌疲劳后 ,比目鱼肌H波明显受到抑制 ,与安静时比较呈非常显著性差异 ;(2 )胫骨前肌Ⅰa类神经纤维传导被阻断后 ,比目鱼肌H波的抑制现象没有解除。表明 ,胫骨前肌疲劳时比目鱼肌H波被抑制的原因 ,可能是由于主动肌内的代谢产物激活了Ⅲ·Ⅳ类神经纤维的感受器 ,Ⅲ·Ⅳ类神经纤维的传入冲动增加 ,使Ⅰa抑制性中间神经元被激活 ,导致拮抗肌脊髓运动神经元的兴奋性受到了抑制     

Q开关Nd:YAG激光不同波长治疗面部毛细血管扩张疗效比较

目的：观察Q开关Nd：YAG激光不同波长治疗面部毛细血管扩张的疗效及副反应。方法：128例病人按治疗波长随机分为532nm组75例，585nm组53例，治疗光斑2．0mm，能量密度2．2-6．8J／cm。，脉宽10ns；术后3个月根据术前照片判定疗效，标准分为Ⅳ级。结果：治疗次数1-4次，间隔时间3-5个月，两组共治愈71例(55，47％)，疗效与治疗次数成正相关。其中532nm组治愈36例(48．00％)，平均治愈次数2．64次；585nm组治愈35例(66．04％，)，平均治愈次数2．40次，两组痊愈率及副反应差异无显性。结论：Q开关Nd:YAG激光倍频532／nm和585nm两种波长对密度较低、直径较细的面部毛细血管扩张均有可靠疗效，术后除色素沉着发生较高外，其他不良反应较少。     

Acute subcortical stroke and early serotonergic modification: a IDAP study

The intensity dependence of the auditory-evoked potentials (IDAP) is inversely related to serotonergic tone. Depression is frequently observed after stroke, associated with cognitive impairment and increased mortality. Aim of this study was to investigate the serotonergic tone in acute stroke patients by IDAP. Consecutive patients with an acute stroke admitted in our stroke unit were evaluated using clinical and instrumental examinations and compared with healthy controls. The IDAP was calculated as the linear amplitude/stimulus intensity function (ASF) slope, by measuring the peak-to-peak amplitude of Nl-P2 on four blocks of different stimulus intensities. Twenty patients were enrolled; 11 had a right brain infarction; nine had depressive symptoms (DS). The ASF slope of the auditory-evoked potentials was markedly increased in stroke patients compared with controls ( P  = 0.021). Stroke patients with DS had a significant steeper ASF slope than controls ( P  = 0.017). There was no statistical difference in ASF slope between stroke patients without DS and controls. Post-stroke depression pathophysiology is still debated. Our study suggests that in acute stroke patients with DS, there is a direct involvement of the serotonergic system, regardless the degree of disability and the site of the lesion.     

Seasonal covariation of the circadian phases of rectal temperature and slow wave sleep onset

There is a scarcity of well-controlled studies of the seasonal variation in circadian rhythmicity. In the present study, the circadian phase of rectal temperature and the onset of slow wave sleep were studied in a series of twelve 24-h experiments, one each month of the year, for six healthy subjects under controlled conditions in a climatic chamber. In winter, as compared with summer, the average circadian rhythm of rectal temperature was phase delayed by 45 min, and the average onset of slow wave sleep was phase delayed by 40 min. The temporal relationship between the circadian phase of rectal temperature and the timing of slow wave sleep was maintained throughout the year. Habitual rising and retiring times covaried as well. Furthermore, the circadian rhythm of rectal temperature followed the timing of the photoperiod across the year, but had a much smaller range of seasonal variation. Apparently, the seasonal variation in the photoperiodic zeitgeber is largely compensated for by the stabilizing influence of secondary zeitgebers. However, in healthy subjects some effect of photoperiodic variation can still be observed.     

氟乙酰胺的极谱测定法

目的建立微量氟乙酰胺的极谱分析法。方法应用氟乙酰胺在高温强碱条件下的分解反应,利用极谱法对其分解产物形成的ALC-La-F-三元络合物在pH=4.90的含KNO3的六次甲基四胺缓冲液中的-0.67V处的络合物吸附波进行测定。结果在所选定的最佳条件下,氟乙酰胺的线性范围为5.0×10-8～1.2×10-6mol/L,回归方程y=3.49x+0.042,相关系数r=0.9996,方法的检测下限为2.0×10-8mol/L。结论该法可用于测定面粉中的氟乙酰胺。     

自制新荧光剂EPQS的性能测试

作者对自制新荧光剂EPQS进行了性能测试。结果:量子产率为0.21;最大激发波长和荧光波长分别为375nm和484nm,stokes位移109nm;检测生物化合物常用的缓冲溶液对荧光峰位无影响,对荧光强度影响很小;温度的影响也小(18～43℃,FRI61.5～58.1),PH的影响也不大。说明EPQS不仅荧光参数好,而且稳定性也好。适合在较广泛的环境条件下使用。