数字式心电图机的日常保养

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                    <p style="line-height: 1.5em;">1．对初次接受心电图检查者，必须事先作好解释工作，消除紧张心理。</p><p style="line-height: 1.5em;"><br  /></p><p style="line-height: 1.5em;">2．在每次作常规心电图之前受检者应经充分休息，解开上衣，在描记心电图时要放松肢体，保持平静呼吸。</p><p style="line-height: 1.5em;"><br  /></p><p style="line-height: 1.5em;"><strong><span style="font-size: 20px;">皮肤处理和电极安置</span></strong></p><p style="line-height: 1.5em;"><br  /></p><p style="line-height: 1.5em;">1．如果放置电极部位的皮肤有污垢或毛发过多，则应预先清洁皮肤或剃毛。</p><p style="line-height: 1.5em;"><br  /></p><p style="line-height: 1.5em;">2．应该用电膏（剂型分为：糊剂、霜剂和溶液等）涂擦放置电极处的皮肤，而不应该只把导电膏涂在电极上。此外还应尽量避免用棉签或毛笔沾生理盐水或酒精甚至于用自来水代替导电膏，因为用这种方法处理皮肤，皮肤和电极之间的接触阻抗较大，极化电位也很不稳定，容易引起基线漂移或其它伪差，尤其是皮肤干燥或皮脂较多者，伪差更为严重。</p><p style="line-height: 1.5em;"><br  /></p><p style="line-height: 1.5em;">3．严格按照国际统一标准，准确安放常规12导联心电图电极。必要时应加作其它胸壁导联，女性乳房下垂者应托起乳房，将V3、V4、V5 电极安放在乳房下缘胸壁上，而不应该安置在乳房上。</p><p style="line-height: 1.5em;"><br  /></p><p style="line-height: 1.5em;">4．描记V7、V8、V9导联心电图时，必须仰卧位，而不应该在侧卧位时描记心电图，因此背部的电极最好扁的吸杯电极，或临时贴一次性心电监护电极并上连接导线代替。</p><p style="line-height: 1.5em;"><br  /></p><p style="line-height: 1.5em;">5．不要为了图方便，将接左、右下肢的电极都放在一侧下肢，因为目前的心电图机都放在一侧下肢，因为目前的心电图机都装有“右下肢反驱动”电路，它能有效地抑制交流电干扰，上述作法等于取消了此项功能，从而降低了抗交流电干扰的性能。此时操作者虽然可以用“交流电滤波”来减轻干扰，但是却同时心电图波形失真。</p><p style=""><img src="http://mmbiz.qpic.cn/mmbiz/rz7R73cuHRrv6jdOCoJeZmYwvEAIoHpY0a7yJL2egiaEokLTpwkIsIRTzTFUic09aEThKHS4hrEcSqU0lAS3tu5g/0" data-ratio="0.14784394250513347" data-w="487" width="auto" width="auto" src="http://mmbiz.qpic.cn/mmbiz/rz7R73cuHRrv6jdOCoJeZmYwvEAIoHpY0a7yJL2egiaEokLTpwkIsIRTzTFUic09aEThKHS4hrEcSqU0lAS3tu5g/0?tp=webp" style="margin: 0px; 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