Arterial blood
gas measurements are a relatively insensitive
measure of impending respiratory
decompensation in MG since the
initial changes are usually consistent
with hyperventilation and may falsely
be attributed to anxiety.

Is this what you are talking about, Annie?? Am I misreading or misunderstanding?? Because I "think" that the author AGREES with you -- and is saying that a person who does NOT understand MG may "falsely" conclude that ABG measurements are a result of hyperventilation, when IN FACT, they are a result of an impending crisis.