title: Respiratory depression after alfentanil infusion.
mesh_terms: D000368:Aged; D015760:Alfentanil; D000701:Analgesics, Opioid / Q000009:adverse effects*; D005260:Female; D005283:Fentanyl / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives*; D006801:Humans; D007263:Infusions, Parenteral; D008297:Male; D008875:Middle Aged; D012131:Respiratory Insufficiency / Q000139:chemically induced*
chemical_list: D000701:Analgesics, Opioid; D015760:Alfentanil; D005283:Fentanyl