The rebound pain after nerve block could interfere with patient's recovery and rehabilitation. It is not known how local anesthetic concentrations affect rebound pain. The aim of this study is evaluation of the effect of local anesthetic concentration on rebound pain after interscalene block for shoulder surgery.
Shoulder surgery is related to more than moderate pain after surgery. Interscalene nerve block could reduce the postoperative pain effectively. When the effect of nerve block ends, however, rebound pain could appear. The rebound pain could interfere with patient's recovery and rehabilitation. The mechanism of rebound pain is not well known. One of possible mechanism is that the pain stimulus that was blocked suddenly comes out, and it is perceived as more severe pain. The strength of the block may vary depending on the concentration of the local anesthetic. Therefore, the concentration of local anesthetics could affect rebound pain. The aim of this study is evaluation of the effect of local anesthetic concentration on rebound pain after interscalene block for shoulder surgery.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
TRIPLE
Enrollment
60
Reduced concentration of ropivacaine We usually use 0.5% ropivacaine in our facility. The intervention group used 0.15% ropivacaine 15 ml
0.5% ropivacaine 15ml
Ajou university school of medicine
Suwon, Gyeonggi-do, South Korea
RECRUITINGRebound pain score
It is calculated by subtracting the visual analogue scale (VAS) of pain at the last time when the nerve block was effective from the highest VAS for 12 hours from the time when the nerve block effect disappeared. VAS of pain: 0=no pain \~ 10=very severe pain
Time frame: 48 hours after surgery
total postoperative fentanyl dose
Total dose of fentanyl injected (mcg) through patient controlled analgesia (PCA) for 48 hours after surgery
Time frame: 48 hours after surgery
fentanyl bolus injection time
Number of bolus injection times using patient controlled analgesia (PCA)
Time frame: 48 hours after surgery
Subjective satisfaction
Patient's subjective satisfaction 48 hours after surgery Use visual analogue scale (0=very unsatisfied, 10= very satisfied)
Time frame: 48 hours after surgery
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