title: Prolonged depression of respiratory rate following methadone analgesia.
mesh_terms: D000368:Aged; D000768:Anesthesia, General; D001021:Aortic Valve / Q000601:surgery; D001024:Aortic Valve Stenosis / Q000601:surgery; D003864:Depression, Chemical; D005260:Female; D006801:Humans; D008691:Methadone / Q000008:administration & dosage / Q000009:adverse effects*; D009609:Nitrous Oxide; D011183:Postoperative Complications / Q000139:chemically induced; D012119:Respiration / Q000187:drug effects*
chemical_list: D009609:Nitrous Oxide; D008691:Methadone