The uterine-muscle relaxation required for complicated obstetric situations traditionally has been achieved by use of a potent inhalation anesthetic. However, this procedure exposes the obstetric patient with full stomach to unnecessary general anesthesia, with the attendant risk and potentially lethal complications. Emergent uterine relaxation may be required for conditions such as retained placenta, uterine inversion, internal podalic version (IPV), and breech extraction.
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