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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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Low concentration | Experimental | Interscalene block with 0.15% ropivacaine 15 ml |
|
| Usual concentration | Active Comparator | Interscalene block with 0.5% ropivacaine 15 ml |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Reduced concentration of local anesthetic (ropivacaine) | Other | Reduced concentration of ropivacaine We usually use 0.5% ropivacaine in our facility. The intervention group used 0.15% ropivacaine 15 ml |
| Measure | Description | Time Frame |
|---|---|---|
| Rebound 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 | 48 hours after surgery |
| Measure | Description | Time Frame |
|---|---|---|
| total postoperative fentanyl dose | Total dose of fentanyl injected (mcg) through patient controlled analgesia (PCA) for 48 hours after surgery | 48 hours after surgery |
| fentanyl bolus injection time |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| In Kyong Yi, MD | Contact | +82-31-219-7522 | lyrin01@gmail.com |
| Name | Affiliation | Role |
|---|---|---|
| In Kyong Yi, MD | Ajou University School of Medicine | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Ajou university school of medicine | Recruiting | Suwon | Gyeonggi-do | 16499 | South Korea |
We will provide it when we have a reasonable request.
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| ID | Term |
|---|---|
| D000077212 | Ropivacaine |
| ID | Term |
|---|---|
| D000813 | Anilides |
| D000577 | Amides |
| D009930 | Organic Chemicals |
| D000814 | Aniline Compounds |
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Randomized controlled trial One group received interscalene block with 0.15% of ropivacaine One group received interscalene block with 0.5% of ropivacaine
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Only investigator who prepared the local anesthetics knows the group. Nerve block performer and outcome assessor are applied masking.
| Usual concentration of local anesthetic (ropivacaine) | Other | 0.5% ropivacaine 15ml |
|
Number of bolus injection times using patient controlled analgesia (PCA)
| 48 hours after surgery |
| Subjective satisfaction | Patient's subjective satisfaction 48 hours after surgery Use visual analogue scale (0=very unsatisfied, 10= very satisfied) | 48 hours after surgery |
| D000588 |
| Amines |