Unverified85% confidenceDecision RuleTime unknown
灌注指数PI值是被忽视的关键指标，PI<0.4时测量数据可信度差；选购标注PI显示的机型可判断当前读数是否可靠，尤其对手脚冰凉、末梢循环差的老人更重要
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Unverified灌注指数PI是判断读数可信度的关键指标，PI<0.4时读数不可靠，选购时优先带PI值显示的机型，可在手指冰凉、血液循环差时判断是否为无效读数90% 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84% similarUnverified支持PI灌注指数显示，可辅助判断测量时手指末梢循环状态，若PI值过低说明末梢循环差、读数可能不够准确84% 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82% similar
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