Remifentanil vs. meperidine for patient-controlled analgesia during colonoscopy: a randomized double-blind trial.
OBJECTIVE
The aim was to compare patients' and endoscopists' satisfaction in terms of efficacy and safety of remifentanil patient-controlled analgesia (PCA) during colonoscopy with that of a combination of midazolam and meperidine.


METHODS
Sixty patients undergoing colonoscopy were randomly assigned to two groups. All of the patients received midazolam 0.03 mg/kg intravenously for premedication. In the remifentanil group, a bolus dose of remifentanil was given, and a patient-controlled sedation analgesia (PCSA) pump was set to inject further bolus doses with no "lockout" time. Patients in the meperidine group received a bolus of meperidine and sham PCSA. Non-invasive arterial blood pressure, electrocardiography, and pulse oximetry were monitored throughout the study. The Observer's Assessment of Alertness and Sedation Scale (OAA/S) was performed at baseline, every 5 min during, and after colonoscopy. Assessment of pain and satisfaction with sedoanalgesia was scheduled after colonoscopy and 24-72 h later by a 100 mm visual analog scale (VAS). The technical difficulty of the examination and the gastroenterologist's satisfaction were assessed similarly.


RESULTS
The degree of pain, the level of satisfaction with sedoanalgesia by patients and gastroenterologists, and the degree of difficulty experienced by the endoscopist were not different in the two groups. The time to reach an Aldrete score > or = 9 was significantly shorter in the remifentanil group (P < 0.0001); discharge times did not differ between the groups (P = 0.36). There was no difference between the groups regarding the duration of colonoscopy (P = 0.82) and the stability of vital signs. At the end of the procedure, OAA/S was significantly higher in the remifentanil group (P = 0.03).


CONCLUSIONS
Remifentanil PCA is safe and effective to induce sedoanalgesia during colonoscopy. Further studies should address the optimization of dosing and lock out setting.
Fanti
Lorella
L
Department of Gastroenterology, Vita-Salute University of Milano, IRCCS H. San Raffaele, Milano, Italy. fanti.lorella@hsr.it
Agostoni
Massimo
M
Massimo
Agostoni
A
Gemma
Marco
M
Marco
Gemma
G
Gambino
Giulia
G
Giulia
Gambino
G
Facciorusso
Antonio
A
Antonio
Facciorusso
F
Guslandi
Mario
M
Mario
Guslandi
G
Torri
Giorgio
G
Giorgio
Torri
T
Testoni
Pier Alberto
PA
Alberto
Testoni Pier
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