Mininimum Effective Anaesthetic Volume of Local Anaesthetic
Conditions
Brief summary
The Shamrock method is a new ultrasound-guided lumbar plexus block. The aim of the study is to determine the minimum effective volume of ropivacaine 0.5% required to produce an effective lumbar plexus block with this method. Using the Dixon and Massey up-and-down method study design, 30 patients scheduled for elective total hip and knee arthroplasty will be included in the study.
Interventions
OTHERlumbar plexus block
Sponsors
Oslo University Hospital
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Masking
DOUBLE (Subject, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 70 Years
Healthy volunteers
No
Inclusion criteria
* orthopaedic patients scheduled for elective hip and knee arthoroplasty * ASA 1 - 2 or stable ASA 3 * age between 18 and 70 years * good ability to communicate and to cooperate
Exclusion criteria
* ASA \> 3 or unstable ASA 3 * BMI \> 32 * chronicle pain * nephrological diseases or nephropathy * known contraindications against the use of local anaesthetics * pregnancy
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| minimum effective volume | from day 1 up to 20 weeks | The primary outcome measure (MEV) is based on 30 measurements in 30 patients (secondary outcome measure: block success). MEV is determined by Dixon and Massey up-and-down method when all patients have been tested in the study |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| block success | Day 1 | 45 minutes after lumbar plexus blockade was performed |
Countries
Norway
Outcome results
None listed