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术中使用气压波动对术后静脉血栓栓塞的预防效果
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作者 张海梅 钟雪霜 +2 位作者 张晓玲 魏红艳 凌前珍 《西南军医》 2018年第6期631-634,共4页
目的评价气压波动预防消化道肿瘤患者术后深静脉血栓和肺栓塞的临床效果。方法将需要手术治疗的胃癌和结直肠癌患者随机分为治疗组和对照组,治疗组53例,无干预组49例,治疗组在术中给予气压波动治疗,无干预组不给予预防治疗。术前常规进... 目的评价气压波动预防消化道肿瘤患者术后深静脉血栓和肺栓塞的临床效果。方法将需要手术治疗的胃癌和结直肠癌患者随机分为治疗组和对照组,治疗组53例,无干预组49例,治疗组在术中给予气压波动治疗,无干预组不给予预防治疗。术前常规进行下肢深静脉超声检查,术后第6天检测肺栓塞、深静脉血栓发生和腘静脉流速,比较两组之间有无差异。结果两组患者的性别、年龄和病种分布无显著性差异。治疗组和对照组术后第6天的平均腘静脉流速分别为(48. 2±7. 6)cm/s和(46. 8±6. 7)cm/s(P=0. 736)。治疗组和无干预组的深静脉血栓发生率分别为5. 7%和22. 4%,两组对比差异有统计学意义(P=0. 02)。无干预组术后发生肺栓塞一例,治疗组无肺栓塞发生(P=0. 48)。结论术中气压波动治疗可有效预防消化道肿瘤患者术后静脉血栓栓塞的发生。 展开更多
关键词 汽压波动 静脉血栓栓塞 预防效果
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Proposal and Analyses of Resonant Bilateral Converter Employing Simple Zero Current Switches
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作者 Keiju Matsui Masaru Hasegawa 《Journal of Energy and Power Engineering》 2012年第3期404-410,共7页
With the development of devices for high performance, the circuit technologies have been also studied. One of the main streams concerns a soft switching technology to mitigate switching stress, leading to the reductio... With the development of devices for high performance, the circuit technologies have been also studied. One of the main streams concerns a soft switching technology to mitigate switching stress, leading to the reduction in switching losses or electro-magnetic noise. On the other hand, as a characterized orthodox technology', the existing chopper circuit is used for the electric vehicles, etc.. Such technologies have a tendency to go out of vogue as power supplies for such vehicles. However, as a boost chopper for the battery charger for an electric vehicle, those technologies become a main stream, where a bilateral function is required. With the foregoing in mind, the authors have devised and analyzed the bilateral chopper using the soft-switch technology, which could be applied to a battery charger for an electric vehicle or similar. 展开更多
关键词 LC resonance soft switch bilateral chopper boost chopper current resonance.
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