When should a patient undergoing dilation and evacuation of products of gestation be intubated?

Abstract

A 32-year-old G4P0030 at 22 weeks is seen by her obstetrician for moderate vaginal bleeding that began 2 days ago upon returning from a trip to the Bahamas. She explains that this morning after breakfast, she experienced severe cramping and worsening bleeding. She is worried because "I’ve already lost 3 babies and I really want a child."