脑外伤后脑干组织中血管内皮细胞及血浆蛋白分布改变的免疫？…

目的:探讨脑外伤后脑干组织中血脑屏障和神经细胞的病理学改变.方法:采用免疫组化染色显示人体脑干组织中的血管内皮细胞(CD31)和某些血浆蛋白(白蛋白及 IgM).结果:1.在正常脑干组织中, CD31阳性物呈连续的线条状,围成规则的血管腔,其周围无明显间隙;血浆蛋白位于血管内,未见到血浆/蛋白阳性神经细胞或神经纤维.2.脑外伤后,脑干中的 CD31阳性物呈不规则弯曲的小片段状,围成不规则的血管腔,其周围间隙明显增宽;同时可见到白蛋白及IgM阳性神经细胞和神经纤维.结论:脑外伤后,脑干组织中的血脑屏障受到了破坏,而且神经细胞也有不同程度的损伤.     

U-Patch GAN: A Medical Image Fusion Method Based on GAN

Journal of Digital Imaging - Although medical imaging is frequently used to diagnose diseases, in complex diagnostic situations, specialists typically need to look at different modalities of image...     

Rest and treadmill exercise first-pass radionuclide ventriculography: Validation of left ventricular ejection fraction measurements

Background

To assess the accuracy of rest and treadmill exercise first-pass radionuclide ventriculographic measurements of left ventricular ejection fraction (LVEF), 40 patients underwent treadmill exercise first-pass and bicycle exercise equilibrium radionuclide ventriculography. To determine the frequency of technically adequate treadmill exercise first-pass studies, an additional 128 consecutive patients undergoing treadmill exercise first-pass procedures during stress^99mTc-labeled sestamibi myocardial perfusion studies were assessed.

Methods and Results

The treadmill exercise first-pass procedure used a multicrystal camera and an²⁴¹Am point source to allow for correction of patient motion. Excellent correlations were observed between resting first-pass and resting equilibrium LVEF (r=0.91; standard error of the estimate=5.6). A high correlation was also observed between treadmill exercise first-pass and bicycle equilibrium exercise LVEF measurements (r=0.85, standard error of the estimate=7.6). Treadmill first-pass LVEF systematically underestimated the bicycle equilibrium LVEF. Intraobserver agreement for rest and exercise first-pass LVEF was high (r values of 0.98 and 0.94, respectively). Of the 168 consecutive treadmill exercise first-pass studies evaluated for technical adequacy, 21 (12.5%) were deemed technically inadequate, with most of the sources of error being avoidable. The frequency of technically adequate studies was as high (87%) in high levels of exercise (Bruce stages 3 and 4) as in lower levels (88%). The findings of this study validate the first-pass treadmill exercise LVEF measurement.

Conclusion

This procedure now provides the option for combining the information of peak treadmill exercise LVEF with measurements of exercise myocardial perfusion from the same injection of radioactivity.     

睡眠呼吸暂停综合征患者夜间睡眠呼吸参数的变化及护理对策(英文)

目的：探讨睡眠呼吸暂停综合征（ＳＡＳ）患者夜间睡眠呼吸参数的变化及相应护理对策。方法：对１６例ＳＡＳ住院患者在治疗前、睡眠姿势训练、气道持续正压（ＣＰＡＰ）呼吸机治疗三种状态下,进行整夜多导睡眠仪监测。结果：在ＳＡＳ整夜呼吸紊乱中,零点以后其危险因素大大增加,出现严重低氧血症,血压升高,心律失常,尤其是呼吸暂停时间延长,次数增加。而侧卧位可显著地改善低氧血症,最低血氧饱和度（ＳａＯ２）从（６２±１９）％升高至（８３±１１）％（Ｐ＜０．０１）,ＣＰＡＰ呼吸机治疗能使呼吸调节障碍得到明显的恢复,呼吸暂停由（４４．３±２２．６）次降至（０．２５±０．５４）次（Ｐ＜０．０１）。结论：护理上应密切观察病情变化,特别是零点以后应加强巡视,除观察呼吸运动外还应警惕脑血管病及心脏疾病的发生,对不具备ＣＰＡＰ呼吸机治疗条件者宜采取睡眠时督促取侧卧位。对ＳＡＳ患者进行健康教育也是减少危险因素的重要护理措施。     

肿瘤标志物DR-70在恶性肿瘤诊断中的应用

目的：评价肿瘤标志物ＤＲ－７０在恶性肿瘤中的诊断应用。方法：应用美国ＡＭＤＬ公司的ＤＲ－７０＾ＴＭ ＥＬＩＳＡ试剂盒,测定对２０例正常人和５９例恶性肿瘤病人血清ＤＲ－７０含量。结果：各种恶性肿瘤ＤＲ－７０的阳性率为６６．７￣１００％,均较正常对照组有非常显著性差异（Ｐ〈０．００１）。结论：血清ＤＲ－７０是诊断恶性肿瘤有价值的标志物。     

Clonal growth of human acute leukemia cells in serum-free methylcellulose medium

Ｔｈｅｇｒｏｗｔｈｏｆｌｅｕｋｅｍｉａｉｎｓｅｍｉｓｏｌｉｄｃｕｌｔｕｒｅｉｎｖｉｔｒｏｗａｓｄｅｐｅｎｄｅｎｔｏｎｔｈｅｐｒｅｓ－ｅｎｃｅｏｆｅｘｏｇｅｎｏｕｓｓｅｒｕｍ．Ｓｅｒｕｍｉｓａｍｉｘ－ｔｕｒｅｃｏｎｔａｉｎｉｎｇｌａｒｇｅｎｕｍｂｅｒｏｆｕｎｉｄｅｎｔｉｆｉｅｄｃｈｅｍｉｃａｌｃｏｍｐｏｎｅｎｔｓａｎｄｕｎｉｄｅｎｔｉｆｉｅｄｂｉｏ－ｌｏｇｉｃａｌｌｙａｃｔｉｖｅｓｕｂｓｔａｎｃｅｓ［１］,ｗｈｉｃｈｐｒｏｖｉｄｅｔｈｅｎｕｔｒｉｅｎｔｓｎｅｃｅｓｓａｒｙｆｏｒｔｈｅｃｅｌｌｇｒｏ…     

3种低温保存板层角膜移植材料的电镜观察

评价低温保存板层角膜移植材料的效果。方法将１５只人尸角膜分三组保存２年：４℃甘油脱水法,角膜液氮冷冻法,全眼球液氮冷冻法。并做透射电镜观察。结果第一组中,角膜胶原纤维排列紊乱,疏松,缺乏连续性,可见广纤维变性,纤维间可见极低电子密度灶。     

英脱利匹特增强超声多普勒血流信号作用的实验研究

目的：研究英脱利匹特增强超声多普勒血流信号的作用。方法：在１０ 只兔中应用经颅超声多普勒检测静脉推注４ 种不同剂量（０ ．２、０．５、１．０、２．０ｍｌ／ｋｇ）２０ ％ 英脱利匹特前后的动脉血流信号,并以等量的生理盐水作对照。结果：各种剂量２０ ％ 的英脱利匹特注射后多普勒血流信号强度明显增强, 平均比生理盐水及注射前血流信号强度高２６．８±９．７ｄＢ。注射生理盐水后多普勒血流信号强度未见明显改变。结论：静脉注射２０ ％ 英脱利匹特能够增强血流信号,提高多普勒检测的敏感性。     

Intrathecal adenosine does not relieve allodynia-like behavior in spinally injured rats

The intrathecal (i.t.) administration of the adenosine A1-receptor agonist R-phenylisopropyl-adenosine (R-PIA) reduced pain-related behaviors after peripheral nerve or spinal cord injury in rats. The endogenous ligand adenosine is clinically available and has been tested i.t. as an analgesic. Thus, we set out to investigate whether i.t. adenosine could reduce allodynia in a model of central pain in spinally injured rats. I.t. adenosine did not reduce mechanical and cold allodynia-like behaviors at doses of 10, 100 and 187 nmol, whereas i.t. R-PIA at 10 nmol markedly alleviated allodynia in the same animals. The lack of effect by exogenous adenosine may be due to pharmacokinetic or pharmacodynamic reasons. Alternatively, adenosine may have reduced affinity and selectivity towards the A1-receptors which may be important for the antiallodynic effect.