Clinically, the pulse oxygen saturation of patients with chronic heart failure does not decrease significantly, and the clinical manifestations of labor-related dyspnea are not typical. As such, it is difficult to make a rapid diagnosis.

中文翻译：

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测量手臂按压前后脉搏血氧饱和度差异快速诊断慢性心力衰竭的研究

临床上，慢性心力衰竭患者脉搏血氧饱和度无明显下降，分娩相关呼吸困难的临床表现不典型。因此，很难做出快速诊断。