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Diaphragm function after interscalene brachial plexus block: a double-blind, randomized comparison of 0.25% and 0.125% bupivacaine.
- Source :
-
Journal of shoulder and elbow surgery [J Shoulder Elbow Surg] 2013 Mar; Vol. 22 (3), pp. 381-6. Date of Electronic Publication: 2012 Sep 01. - Publication Year :
- 2013
-
Abstract
- Background: Interscalene brachial plexus block (ISBPB) provides excellent analgesia after rotator cuff surgery but is associated with diaphragm dysfunction. In this study, ISBPB with 20 mL of 0.125% or 0.25% bupivacaine were compared to assess the effect on diaphragm function, oxygen saturation, pain control, opioid requirements, and patient satisfaction.<br />Materials and Methods: In this prospective, randomized, double-blind study, 30 adults undergoing outpatient arthroscopic rotator cuff repair were enrolled to receive ultrasound-guided interscalene brachial plexus catheter placement with 20 mL of 0.125% (n = 15) or 0.25% bupivacaine (n = 15). Diaphragm function and oxygen saturation were assessed before ISBPB placement and on discharge from the postanesthesia care unit. Postoperative pain scores, opioid requirements, and patient satisfaction were compared.<br />Results: Diaphragm function and oxygen saturation were superior in the low concentration group. Absent or paradoxic motion of the diaphragm was present in 78% of the 0.25% group compared with 21% of patients in the 0.125% group (P = .008). Oxygen saturation decreased 4.3% in the 0.25% group compared with a decrease of 2.6% in the 0.125% group (P = .04). Pain scores averaged 1 of 10 in the 0.25% group and 0 of 10 in the 0.125% group (P = .02). Opioid requirements and patient satisfaction were not different between the two groups.<br />Conclusions: In this randomized, double-blind comparison of ISBPB performed with 20 mL of 0.125% or 0.25% bupivacaine, diaphragm function and oxygen saturation were superior in patients treated with more dilute bupivacaine. Furthermore, there were no clinically significant differences in pain scores, and no statistically significant differences in opioid requirements and patient satisfaction.<br /> (Copyright © 2013 Journal of Shoulder and Elbow Surgery Board of Trustees. Published by Mosby, Inc. All rights reserved.)
- Subjects :
- Analgesics, Opioid therapeutic use
Arthroscopy
Diaphragm diagnostic imaging
Diaphragm innervation
Double-Blind Method
Female
Humans
Male
Middle Aged
Oximetry
Pain Measurement
Patient Satisfaction
Prospective Studies
Rotator Cuff Injuries
Ultrasonography
Anesthetics, Local
Bupivacaine
Diaphragm drug effects
Nerve Block
Pain, Postoperative drug therapy
Rotator Cuff surgery
Subjects
Details
- Language :
- English
- ISSN :
- 1532-6500
- Volume :
- 22
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Journal of shoulder and elbow surgery
- Publication Type :
- Academic Journal
- Accession number :
- 22947235
- Full Text :
- https://doi.org/10.1016/j.jse.2012.06.011