Nitrous Oxide Compared With Intravenous Sedation for Second-Trimester Abortion

OBJECTIVE:To assess whether inhaled nitrous oxide is noninferior to intravenous (IV) sedation for pain control during outpatient surgical abortion between 12 and 16 weeks of gestation.METHODS:We enrolled women undergoing surgical abortion at 12–16 weeks of gestation into a multisite, double-blind cl