相較於健康者,肺氣腫(emphysema)的病患有下列那些特徵?①呼吸道阻力(airway resistance)增加 ②肺臟順應性(lung compliance)減少 ③生理無效腔(physiological dead space)增加 ④體動脈(systemic artery)血中血氧飽和度百分比(oxygen saturation percentage,\mathrm{S_{aO_{2}}})不變
\mathrm{S_{aO_{2}}}
①②③④
僅①③
僅②③
僅①④