Nitrobenzene poisoning and spurious pulse oximetry

The successful management of nitrobenzene poisoning in a 21-year-old patient is presented. We report our experience of ventilatory care with additional intravenous methylene blue and ascorbic acid therapy. Pulse oximeters available at present are not useful in patients treated with methylene blue and should be used cautiously in the presence of cyanosis of unknown aetiology.     

脉冲吸氧与脉冲吸氧仪

本文介绍了脉冲吸氧的机理和优越性以及脉冲吸氧仪的原理。脉冲吸氧可以增加吸氧效果,减少感染,大大降低氧耗量。     

超声显像诊断下肢深静脉血栓的临床应用

目的：探讨超声诊断下肢深静脉血栓的临床价值。方法：应用ＨＰ８５００多功能彩超仪，７．５ＭＨｚ线阵探头，外周血管软件检查临床疑下肢深静脉血栓３２例，另取１２例正常人２４条下肢深静脉作对照。２ＤＵＳ显示形态学改变，ＣＶＩ及ＰＷ模式观察血流状态。结果：超声检出下肢深静脉血栓形成２５例，除外血栓形成７例。２ＤＵＳ显示血栓形成部位血管内径明显增大，与患者健侧同水平深静脉内径进行配对ｔ检验，ｔ＝１３．８２，Ｐ     

新一代低频电治疗仪的研制

本文介绍一种新型低频电脉冲治疗仪，采用新型单片机、程序控制和OTL功率放大器，产生变化有序的多种治疗脉冲波形模拟针灸治疗。电脉冲刺激器治疗仪可以用作减轻疼痛、放松肌肉、预防和减缓肌肉萎缩、增加局部血液循环等。     

Can people hear the pitch change on a variable-pitch pulse oximeter?

The introduction of the variable-pitch feature on pulse oximeters in 1983 by the Nellcor Corporation (Hayward, CA) allowed users to rapidly detect changes in oxygen saturation by listening for changes in the pitch of the tones emitted by the pulse oximeter. A few individuals have reported that they have been unable to detect a change in pitch when oxygen saturation changes. To these individuals, the variable-pitch feature of these pulse oximeters has not been beneficial. Using the pitches from one manufacturer of oximeters, we created a computer program to simulate the pitches that accompanied various oxygen saturations. The pitches were recorded onto a tape player and played for 75 volunteer subjects unfamiliar with the pitches of a variable-pitch pulse oximeter. Of our sample, 67% were able to detect a single change in pitch corresponding to a 1% fall in oxygen saturation, and 11% of the population could not detect a change in pitch until there was a change in pitch with every beat. We suggested four alternative designs that may prove beneficial to this group of individuals.     

苏乐康等抑制细胞转化能力及其机制的探讨

研究了苏乐康、绿茶提取物对~(60)钴γ射线和雌性激素联合诱发叙利亚金黄地鼠胚胎细胞恶性转化的抑制能力,并用脉冲辐解技术,对其抑制机制进行初步探讨。实验结果表明,苏乐康、绿茶提取物对γ射线和雌性激素联合诱发的金黄地鼠胚胎细胞恶性转化的抑制率分别为70.15％(P<0.05)和81.59％(P<0.05),它们的这种抑制能力与其清除超氧阴离子的能力有关,     

Nonlinear excitation profiles for three-dimensional inflow MR angiography

An RF excitation pulse for three-dimensional (3D) time-of-flight (TOP) MR angiography (MRA) with a nonlinear excitation profile was numerically calculated under the condition of uniform vessel signal across the excitation volume (slab), and the superiority of the optform pulse as compared with conventional RF pulses and TONE pulses was demonstrated. For this purpose we acquired MRA of the lower leg and of the carotid and vertebral arteries in a 30-year-old healthy volunteer. Although the flow velocity ranges in these two anatomic locations are different by about a factor of 10, in both cases the corresponding optform pulse provided the best signal homogeneity at the highest level.     

基于小波模极大原理的脉象特征提取研究

目的 根据小波分析原理，研究脉象特征提取方法，以有效解决基于时域或频域的传统方法所无法准确提取脉象特征的问题。方法 运用小波模极大方法进行脉象信号周期分割和基本分解，沿时间排列并符号化脉象波上升沿与下降沿的模极大特征点、脉象波谷底和波峰的模极大特征点。结果 确定了不明显的重搏前波、重搏波，以及在主波上升沿和下降沿上出现的不规则脉波，并进一步准确提取了脉象信号的多尺度特征和各种时域特征。结论 采用此方法进行脉象信号的特征点定位并进一步完成特征提取，具有简单、快速、准确等特点，为进一步进行脉象分类识别研究奠定了基础。     

Human imaging of phosphorus in cortical and trabecular bone in vivo.

Phosphorus was imaged in vivo in human cortical and trabecular bone and the T(1) and T(2) (*) were measured. An ultrashort TE (UTE) pulse sequence (TE = 70 microm) was used with half pulse excitation and radial mapping of k-space from the center out. T(2) (*) was measured using multiple echo times and T(1) was measured both by saturation recovery and by a method using different RF pulse amplitudes. Seven normal subjects (32-85 years) were examined. Phosphorus was imaged, with a true in-plane resolution of 2.9 x 2.9 mm and a signal-to-noise ratio (SNR) of 19:1, in both cortical and trabecular bone. The mean T(2) (*) value was 207 +/- 12 micros, and the mean T(1) value was 8.6 +/- 3.0 sec. Images and measurements were obtained in realistic times on a clinical MR system. This may provide a new approach to characterizing disease of bone.     

Detection of Human Heart Rate in Exercises State

作者介绍了一种动态心率检测电路，它能准确、可靠地检出在运动状态下的人体心率。电路采用两种检测技术，一种为双时值ＱＲＳ波检测法，另一种为光电脉搏检测法。