7-甲氧基-4′-羟基-3′-二乙胺甲基异黄酮(MHDF)对大鼠血流动力学和主动脉的作用

本实验观察了MHDF对整体大鼠血流动力学和离体大鼠胸主动脉的作用。结果表明iv MHDF(3～12.8 mg/kg)能降低大鼠左心室±dp/dt_max,V_max,V_pm和LVSP,延长T-dp/dt_max,减慢心率。MHDF还能舒张大鼠胸主动脉,ED₅₀为6.5×10^-6mol/L;非竞争拮抗NA和CaCl₂致主脉收缩,pD₂′为3.11±0.21和3.73±0.07;抑制高K⁺致主动脉收缩,IC₅₀为1.76×10^-5mol/L。提示MHDF对血管的作用与α受体阻断剂不同,而可能与钙拮抗有关。     

Beckman EL-ISE电解质分析仪准确性及故障的分析判断

0 引言为了克服离子选择电极（ISE）法的微量电位信号极易受环境温度变化及电子噪声的干扰问题,该仪器采用了参考电极,把参考电极与其测定电极装在同一测量室内,保持其相同的物理环境,使干扰源对所有电极的影响相同. 以内参液作为参考电极的测量对象,测得一个参考电极电位值,再测样品的电极电位值,二者相抵就消除了所叠加的干扰信号.     

心脏直视手术围术期自体血回输335例的监护

0　引言　自体输血是采集患者体内血或回收自体失血,再输回同一患者,献血者与受血者为同一个体,既可以节约临床用血,减少患者费用,更重要是可以避免或减少同种输血传播感染性疾病.我科对335例体外循环心内直视手术患者实行自体血回输,收到较好的社会效益和经济效益.1　临床资料　1998-09/1999-02,我科心脏直视手术共445例,围术期采用自体输血335例,其中先心病226例,瓣膜手术59例,复杂心内畸形37例,冠心病、大血管13例,占同期体外循环心内直视手术75%.患者主要适应证:心脏及大血管外科手术,术前一般情况尚好,无肝、肾、呼吸功能障碍;术前检查…     

The radioactive autopsy: safe working practices

Autopsy cases involving individuals retaining radioactive substances are fortunately rare, but when they occur they can impose significant radiation safety and legal requirements. This review aims to improve the understanding of these issues so that appropriate precautions are implemented when necessary. This review describes the properties of ionizing radiations, natural and man-made sources of ionizing radiation and its use in healthcare. It identifies the most likely circumstances leading to radioactive substances being present during autopsy and sources of information, including radiation protection advice. It discusses precautions that may need to be implemented prior to, during and following autopsy. Despite the issue of appropriate information to patients and next of kin, it is inevitable that some cases will be identified only at autopsy and it is important that robust local procedures are maintained. Information must be communicated to assist safe management of the body and liaison between relevant professional groups may be needed to standardize methods of communication. Provided that appropriate precautions are implemented, determined through consultation with a qualified expert in radiation protection and by completion of risk assessment, the radioactive autopsy can be undertaken safely and in compliance with relevant legislative requirements.     

Abuse characteristics and coping resources as predictors of problem-focused coping strategies among battered women

The current study examines the predictors of three types of problem-focused coping strategies (i.e., amount of help seeking, pursuing an order of protection, and staying away from the abuser) among battered women. Predictor variables are categorized as abuse characteristics and three types of coping resources (i.e., personal, material, and social coping resources). Data from the Chicago Women's Health Risk Study (N=478) are used. Results show that enactment of problem-focused coping strategies is associated with amount of abuse, severity, harassment, and power and control tactics. Coping resources such as general health, employment, and social support influence enactment of coping strategies.