試題詳解

41.已知一位病人P _ĒCO₂ = 26.7 mm Hg、PaCO₂ = 40 mm Hg、P_ACO₂ = 40 mm Hg，一小時後測得P_ĒCO₂ =13.3 mm Hg、PaCO₂ = 40 mm Hg、P_ACO₂ = 20 mm Hg，可能導致此現象的成因為何？
(A)increased anatomical dead space
(B)increased alveolar dead space
(C)increased anatomical shunt
(D)increased physiological shunt