Superseded95% confidenceDecision RuleTime unknown
急救人工呼吸面罩必须带单向阀（one-way valve），阀门可阻止患者呼出气体、呕吐物、血液回流至施救者，无单向阀的普通口罩不能用于CPR急救
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This knowledge claim has been superseded by newer content
急救面罩必须配备单向阀（one-way valve）+ 过滤膜双重结构，单向阀防止施救者接触被救者呼出气体、呕吐物或血液，缺一不可用于CPR人工呼吸Sources
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