Unverified85% confidenceFactTime unknown
肤色深、末梢循环差（手脚冰凉）或低血压时，血氧仪读数会偏低失真，此时应参考PI灌注指数是否达标，PI过低（<0.2）的读数不可信，需暖手后复测
1
Sources
85%
Confidence
Long-term
Relevance
-
First Seen
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Unverified灌注指数（PI值）低于0.3时血氧读数可靠性下降，孕期外周循环变化或手脚冰凉时易出现，选择显示PI值的设备可帮助判断当前读数是否可信，避免因灌注不足误读为低血氧而恐慌84% similarUnverified血氧仪精度受灌注指数(PI)影响，PI<0.4时读数可靠性大幅下降；老年人、低血压、末梢循环差者应选择带PI显示的型号，PI值可判断本次测量是否可信84% similarUnverified指夹式血氧仪的Perfusion Index(PI灌注指数)应≥1才能保证读数可靠，PI＜0.4时低灌注患者、老人、末梢循环差者会测不准或无法读数，选购时优先看是否标注支持低灌注测量80% similarUnverified血氧监测的准确性受灌注指数(PI值)影响：PI＜0.3时数据不可靠，选购家用指夹式血氧仪应看是否显示PI值，无PI显示的低价产品在末梢循环差(如老人、低温)时读数漂移大79% similarUnverified灌注指数（PI值）显示功能很关键，PI<0.3时血氧读数不可靠，老年人、循环差、手脚冰凉者应选带PI指示的监护仪，避免因灌注不足导致误读或读不出78% similar
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