A woman in labor is breathing into a mouthpiece just before the start of her regular contractions. As she inhales, a valve opens and gas is released. She continues to inhale the gas slowly and deeply until the contraction starts to subside
When the inhalation stops, the valve closes. The procedure is: 1. not used much anymore.
2. likely to be in the second stage of labor but not the first.
3. an application of nitrous oxide.
4. a prelude to cesarean birth.
3
1, 2, 4. Incorrect. This is an application of nitrous oxide, which could be done in either the first or second stage of labor (or both) as part of preparation for a vaginal birth.
3. Correct. This is an application of nitrous oxide, which could be done in either the first or second stage of labor (or both) as part of preparation for a vaginal birth.
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