Unverified85% confidenceDecision RuleTime unknown
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
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85%
Confidence
Long-term
Relevance
-
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Unverified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93% 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91% similarUnverifiedPI灌注指数功能对末梢循环差的人群（老人、糖尿病患者、低温环境）至关重要，PI<0.4时普通血氧仪读数极不稳定，应选具备PI显示并支持低灌注模式的机型89% similarUnverified关注PI灌注指数（Perfusion Index）功能：PI<0.4%时测量结果可信度低，具备PI显示的机型能提示当前读数是否可靠，末梢循环差（低血压、寒冷、老年人）的用户应优先选带PI指示的型号88% similarUnverified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88% similar
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