Patients often have acute onset of dyspnea and cough, low, respiratory distress and blood oxygen saturation.

患者通常有急性发作的呼吸困难与咳嗽，低度，呼吸窘迫和动脉血氧饱和。

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Under the condition of low perfusion, the measurement of non-invasive saturation of pulse-blood oxygen is low-accuracy, lower signal-to-noise ratio (SNR) is one of the crucial causations.

在弱灌注条件下，无创脉搏血氧饱和度的测量存在着准确度不高的问题。传感器采集信号的信噪比低是导致该问题的主要原因之一。

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