title: Remifentanil versus meperidine for monitored anesthesia care: a comparison study in older patients undergoing ambulatory colonoscopy.
abstract: Colonoscopy is one of the most frequently performed outpatient procedures in the United States. This study was designed to test the hypothesis that a remifentanil infusion would be superior to boluses of meperidine in older patients undergoing ambulatory colonoscopy. One hundred ASA physical status I-IV patients undergoing colonoscopy were randomized in this double-blinded study to receive either remifentanil infusions (n = 49) or titrated boluses of meperidine (n = 51). Patient tolerance was assessed using physiologic variables and side effects associated with opioid analgesia. Verbal pain/anxiety and patient/operator satisfaction were also assessed. As a group, the physiologic characteristics demonstrated no significant differences in the response to the colonoscopy procedure. Although the patient and operator satisfaction surveys were similar between groups, the incidences of tachycardia, hypotension, and nausea were less and the adjusted verbal pain and anxiety scores were more in the Remifentanil group compared with the Meperidine group. This study demonstrates that remifentanil and meperidine were equally well tolerated in older patients undergoing ambulatory colonoscopy when administered by an anesthesia provider. The differences in the pharmakinetics of remifentanil and meperidine most likely account for the differences noted between the two treatment groups.
  
  
  CONCLUSIONS
  Remifentanil infusions and meperidine boluses are equally well tolerated in older patients undergoing ambulatory colonoscopy when administered by an anesthesia provider.
authors.affiliation: University of Texas Southwestern Medical Center-Dallas, USA. philip.greleich@email.swmed.edu
authors.forename: P E
authors.initials: PE
authors.lastname: Greilich
authors.forename: C D
authors.initials: CD
authors.lastname: Virella
authors.forename: J M
authors.initials: JM
authors.lastname: Rich
authors.forename: M
authors.initials: M
authors.lastname: Kurada
authors.forename: K
authors.initials: K
authors.lastname: Roberts
authors.forename: J F
authors.initials: JF
authors.lastname: Warren
authors.forename: W V
authors.initials: WV
authors.lastname: Harford
mesh_terms: D000759:Adjuvants, Anesthesia / Q000008:administration & dosage* / Q000009:adverse effects; D000368:Aged; D000553:Ambulatory Care; D000701:Analgesics, Opioid / Q000008:administration & dosage* / Q000009:adverse effects; D018686:Anesthetics, Intravenous / Q000008:administration & dosage* / Q000009:adverse effects; D001007:Anxiety / Q000188:drug therapy / Q000209:etiology; D003113:Colonoscopy / Q000009:adverse effects / Q000379:methods*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007262:Infusions, Intravenous; D007275:Injections, Intravenous; D008297:Male; D008614:Meperidine / Q000008:administration & dosage* / Q000009:adverse effects; D008875:Middle Aged; D010146:Pain / Q000188:drug therapy / Q000209:etiology; D010147:Pain Measurement / Q000187:drug effects; D010880:Piperidines / Q000008:administration & dosage* / Q000009:adverse effects; D000077208:Remifentanil
chemical_list: D000759:Adjuvants, Anesthesia; D000701:Analgesics, Opioid; D018686:Anesthetics, Intravenous; D010880:Piperidines; D008614:Meperidine; D000077208:Remifentanil