physio q 5 - sai1

[ArchivalUser]

A pt is given 100% oxygen to breathe,arterial blood gases are determined and a PaO2 of 125mm of Hg is measured.This result is associatde with
A.diffusion abnormality
B.ventilation perfusion inequality
C.anatomic right to left shunting
D.profound hypoventilation
E.the normal rseponse

[ArchivalUser]

ans is ventilation perfusion inequality

[ArchivalUser]

is it d ?

[ArchivalUser]

ans:C,only in true rt to left shunting breathing 100% will not substantially elevate the Pao2,which could be as low as 125mmHg.(cyanotic heart disease)