An interventional study of OBV bupivacaine liposome group and Standard dose bupivacaine liposome group in Pain and Diaphragmatic Dysfunction After Shoulder Arthroscopy, sponsored by Affiliated Hospital of Jiaxing University. Enrolling by invitation at 1 site in China. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-08-28.
Sponsored by Affiliated Hospital of Jiaxing University · Not applicable, Interventional, and Prevention
This study aims to evaluate whether 15ml/75mg low-dose bupivacaine liposome is non-inferior to 15ml/133mg standard-dose bupivacaine liposome for postoperative analgesia in interscalene brachial plexus block during arthroscopic shoulder surgery, through a single-center, prospective, double-blind, non-inferiority randomized controlled clinical trial. It will also assess whether 15ml/75mg low-dose bupivacaine liposome is superior to 15ml/133mg standard-dose bupivacaine liposome in terms of diaphragmatic excursion, pulmonary function, duration of block effect, and nerve block-related adverse reactions during interscalene brachial plexus block.
This study is designed as a single-center, prospective, double-blind, non-inferiority randomized controlled clinical trial, to evaluate and compare whether the postoperative analgesic efficacy of 15 mL/75 mg low-dose liposomal bupivacaine for interscalene brachial plexus block in patients undergoing shoulder arthroscopy is non-inferior to that of 15 mL/133 mg standard-dose liposomal bupivacaine, and to further assess whether the low-dose regimen demonstrates advantages over the standard-dose counterpart in terms of diaphragmatic excursion, pulmonary function, duration of block effect, and nerve block-related adverse reactions.
10,054 studies on the registry are indexed under Pain; 1,649 are open to participants now.
This study's planned enrollment of 40 is below the median of 66 across 8,493 interventional studies indexed under Pain.
Browse Pain studies →Affiliated Hospital of Jiaxing University is the lead sponsor of 17 studies on the registry; 10 are open to participants now.
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Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
ASA physical status
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Following our preliminary study protocol, 13 mL of liposomal bupivacaine (derived from the 20 mL/266 mg commercial formulation) is aspirated and further diluted with 0.9% sodium chloride injection to a final total volume of 53 mL while maintaining the fixed total dose of 266 mg. This diluted preparation is then combined with 2 mL of 0.5% conventional bupivacaine, and the resultant 55 mL mixture is administered to perform interscalene brachial plexus block prior to surgical incision.
Drug: OBV bupivacaine liposome group
Following the recommendations in published literature and the approved product labeling, 10 mL of liposomal bupivacaine (20 mL/266 mg formulation) is aspirated, combined with 2 mL of 0.5% conventional bupivacaine, diluted to a final total volume of 15 mL with 0.9% sodium chloride injection, and administered to perform ultrasound-guided interscalene brachial plexus block prior to surgical incision.
Drug: Standard dose bupivacaine liposome group
Following our preliminary study protocol, 13 mL of liposomal bupivacaine (derived from the 20 mL/266 mg commercial formulation) is aspirated and further diluted with 0.9% sodium chloride injection to a final total volume of 53 mL while maintaining the fixed total dose of 266 mg. This diluted preparation is then combined with 2 mL of 0.5% conventional bupivacaine, and the resultant 55 mL mixture is administered to perform interscalene brachial plexus block prior to surgical incision.
Following the recommendations in published literature and the approved product labeling, 10 mL of liposomal bupivacaine (20 mL/266 mg formulation) is aspirated, combined with 2 mL of 0.5% conventional bupivacaine, diluted to a final total volume of 15 mL with 0.9% sodium chloride injection, and administered to perform ultrasound-guided interscalene
Difference in numeric rating scale scores for resting pain at 24 hours after surgery
Difference in numeric rating scale scores(0 = no pain, 10 = worst pain; higher numbers indicate greater pain intensity) for resting pain at 24 hours after surgery. Postoperatively, the NRS scale was used to evaluate pain scores.
Time frame: postoperative 24 hours
Total consumption of morphine milligram equivalents within 72 hours postoperatively
Record opioid analgesics within 72 hours postoperatively, convert to morphine equivalent dose, and calculate the total amount.
Time frame: within 72 hours postoperatively
Differences in numeric rating scale pain scores at rest and during activity within 0.5 hours, 6 hours, 24 hours, 48 hours, and 72 hours postoperatively
Differences in numeric rating scale (0 = no pain, 10 = worst pain; higher numbers indicate greater pain intensity) pain scores at rest and during activity within 0.5 hours, 6 hours, 24 hours, 48 hours, and 72 hours postoperatively. Postoperatively, the NRS scoring scale was used to assess pain scores.
Time frame: postoperative 0.5 hours, 6 hours, 24 hours, 48 hours, 72 hours
Complete unilateral HDP during quiet breathing at 0.5 hours 6 hours, and 24 hours after completion of block
A diaphragm excursion of \>75% on the blocked side measured under ultrasound is defined as complete unilateral hemidiaphragmatic paralysis (HDP).
Time frame: postoperative 0.5 hours, 6 hours and 24 hours
Pulmonary function
Use a portable respiratory function tester for bedside testing; have the patient blow three times and take the average.
Time frame: postoperative 0.5 hours, 6 hours and 24 hours
All adverse events related to surgery and anesthesia occurring within 72 hours postoperatively
Adverse events associated with nerve blocks within 72 hours postoperatively, including pneumothorax, intravascular injection, local anesthetic toxicity, and Horner syndrome, were recorded.
Time frame: within 72 hours postoperatively
The number of rescue analgesic interventions required within 72 hours postoperatively
The number of analgesic administrations within the first 72 hours postoperatively was recorded.
Time frame: within 72 hours postoperatively
sensorimotor score
After completion of the block, the simplified sensorimotor assessment scale (3-point method) is used for evaluation, and a total sensorimotor score ≥12 points with a total sensory score ≥3 points is defined as successful brachial plexus block.
Time frame: postoperative 0.5 hours, 6 hours and 24 hours
Plan to share: Yes
Supporting information: Study protocol
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Studies of the drug tested here: Bupivacaine
Affiliated Hospital of Jiaxing University