The Mininimum Effective Anaesthetic Volume of Local Anaesthetic in Ultrasound-guided "Shamrock" Lumbar Plexus Block

N/ACompletedNCT01956617

Oslo University Hospital30 enrolled

Overview

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.

Study Type

INTERVENTIONAL

Allocation

Masking

DOUBLE

Enrollment

Conditions

Mininimum Effective Anaesthetic Volume of Local Anaesthetic

Interventions

lumbar plexus blockOTHER

Eligibility

Sex: ALLMin age: 18 YearsMax age: 70 Years

Medical Language ↔ Plain English

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

Locations (2)

Department of Anaesthesia and Intensive Care Medicine, Oslo University Hospital

Oslo, Oslo County, Norway

Oslo University Hospital

Oslo, Oslo County, Norway

Outcomes

Primary Outcomes

minimum effective volume

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

Time frame: from day 1 up to 20 weeks

Secondary Outcomes

block success

45 minutes after lumbar plexus blockade was performed

Time frame: Day 1

Data from ClinicalTrials.gov

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