Final answer:
Hyperventilation during preoxygenation for endotracheal intubation can cause gastric distention and hypotension. Continuing hyperventilation for more than 2 minutes is not acceptable. It does not provide a better oxygen reserve or decrease the likelihood of aspiration.
Step-by-step explanation:
Hyperventilation during the preoxygenation phase of endotracheal intubation can cause gastric distention and hypotension. It is not acceptable to continue hyperventilation for more than 2 minutes as it can lead to harmful effects. Hyperventilation does not provide a better oxygen reserve for the patient, as it can cause abnormally low blood carbon dioxide levels and high blood pH. It also does not decrease the likelihood of aspiration.