Brigham and Women’s Hospital on Tuesday became the first labor and delivery center in Boston to offer nitrous oxide or “laughing gas” to women in labor. Women inhale at the beginning of every contraction to take the edge off their pain and relax a bit. It takes about 30 seconds to work, and wears off about 30 seconds after the mask is removed, said Dr. Bill Camann, director of obstetric anesthesia at the Brigham.
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