I have seen a person die on the vent after a car accident. He blood presure began doing strange things...wildly fluctuating form very high to very low. Then she started having episodes of ventricular tachycardia. This was a similar scenerio..the patient was 16 and was ejected from the car and was nearly full term pregnant. Her body was not found at the scene of the accident. A survivor of the accident asked about her pregnant friend and the crew went back to look for her. She was found in some bushes. An ultrasound of the infant showed distress, but the patient was not neurologically stable so anesthesia was out of the question. She had injury to her brain stem and our perineonatologists decided there was no chance her child would survive if delivered. Her blood work showed that she had been without adequate oxygenation for quite some time and thankfully made excuses to the family for why they could not do an emergency c-section. I remember her mother telling me that when she wakes up it's going to be hard on her to find that she has lost her baby. They just didn't get that their daughter was really already dead. She lasted about 6 hours on the vent.