In this study the investigators wish to compare the effect of a selective axillary nerve block to placebo in patients undergoing arthroscopic shoulder surgery. It is the investigators hypothesis that the amount of morphine consumption in the first 4 hours postoperatively in the intervention group will be significant lower than in the placebo group.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Enrollment
60
Single shot nerve block with ropivacaine 10-20 ml; 7,5 mg/ml
Single shot nerve block with isotonic sodiumchloride 10-20 ml; 0.9%
Aleris-Hamlet Hospital
Frederiksberg, Denmark
Morphine consumption
Patients are coupled to an intravenous PCA pump. The amount of morphine administered by the patient in the first 4 hours postoperatively is registered.
Time frame: 0-4 hours postoperatively
Visual analogue scale (VAS) score
Postoperative VAS scores during the first 24 hours postoperatively, divided into two periods.
Time frame: 0-12 hours and 12-24 hours postoperatively
Total morphine consumption
The total amount of morphine administered during the first 24 hours postoperatively
Time frame: 0-24 hours postoperatively
Postoperative nausea and vomiting (PONV)
Postoperative nausea evaluated on a 1-3 scale with and without vomiting
Time frame: 0-4, 0-12 and 12-24 hours postoperatively
Escape block
The use of an escape block (interscalene brachial plexus block) in patients with pain breakthrough despite IV morphine 0-4 hours postoperatively.
Time frame: 0-4 hours postoperatively
Bolus morphine 5 mg iv
Number of morphine boli administered during the first 4 hours postoperatively
Time frame: 0-4 hours postoperatively
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