Anesth Pain Med Search


Anesth Pain Med > Volume 10(1); 2015 > Article
Anesthetic Pharmacology
Anesthesia and Pain Medicine 2015;10(1):21-26.
DOI:    Published online January 31, 2015.
A prospective observational cohort study on postoperative intravenous patient-controlled analgesia in surgeries
Gwan Woo Lee
Department of Anesthesiology and Pain Medicine, Dankook University College of Medicine, Cheonan, Korea.
Received: 18 November 2014   • Revised: 19 November 2014   • Accepted: 24 November 2014
An electrical patient-controlled analgesia (PCA) pump enabled us to collect infusion history of opioid analgesic and other efficacy parameters of PCA, including delivery-to-attempt (D/A) ratio. This study evaluated the effectiveness of PCA in a large population of surgical patients using numerical rating scale (NRS) for pain and D/A ratio.
A total of 6,847 patients were enrolled in this study. All patients received intravenous bolus of fentanyl (0.2 microg /kg) one hour before the end of the surgery. Basal infusion rate, demand bolus, and lockout time of the PCA pump was set as 1 ml/h, 1 ml, and 15 minutes, respectively. The concentration of fentanyl in the analgesic solution was 15 microg/ml.
NRS scores for pain and D/A ratios for the first 6 hours after operations were as follows (median, 25-75%): open colorectal surgery (NRS: 6.5, 5.0-8.0; D/A: 62.5, 46.2-77.8%), laparoscopic colorectal surgery (NRS: 6.0, 4.5-7.0; D/A: 69.2, 50.0-81.9%), open hepato-biliary-pancreas surgery (NRS: 6.0, 4.5-7.0; D/A: 59.2, 38.7-75.0%), open stomach surgery (NRS: 5.0, 4.0-6.7; D/A: 58.1, 41.2-75.0%), open abdominal vascular surgery (NRS: 5.0, 3.5-6.5; D/A: 58.3, 40.0-81.3%), laparoscopic stomach surgery (NRS: 5.0, 4.0-6.0; D/A: 63.6, 45.5-80.0%), laparoscopic hepato-biliary-pancreas surgery (NRS: 5.0, 4.0-6.0; D/A: 66.7, 50.0-80.8%), vascular bypass surgery (NRS: 4.0, 3.0-6.0; D/A: 64.5, 42.7-84.0%), anal surgery (NRS: 4.0, 3.0-5.8; D/A: 71.4, 60.0-100%), and breast surgery (NRS: 3.0, 3.0-4.0; D/A: 86.6, 67.2-100%).
Mean D/A ratios for the first 6 hours after all operations except anal and breast surgeries were below 70%, suggesting that a higher amount of fentanyl should be administered during this period.
Key Words: General surgery, Patient-controlled analgesia, Postoperative pain

Article category

Browse all articles >


Browse all articles >

Editorial Office
101-3503, Lotte Castle President, 109 Mapo-daero, Mapo-gu, Seoul 04146, Korea
Tel: +82-2-792-5128    Fax: +82-2-792-4089    E-mail:                

Copyright © 2024 by Korean Society of Anesthesiologists.

Developed in M2PI

Close layer
prev next