Aspiration risk with EGD?

When do you intubate patients scheduled for EGD's? Wanted to intubate a patient with achalasia and another with food impaction scheduled by the gastroenterologist for EGD under MAC. His response "These patients seldom aspirate and intubation is not standard of care." Is intubation overly conservative? Any literature that you are aware of?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums