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

University of Oslo (UIO)

Status: Completed

Conditions: Mininimum Effective Anaesthetic Volume of Local Anaesthetic

Treatments: Other: lumbar plexus block

Study type: Interventional

Funder types: Other

Identifiers

NCT01956617

2013/1328-3

Details and patient eligibility

About

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.

Enrollment: 30 estimated patients

Sex: All

Ages: 18 to 70 years old

Volunteers: No Healthy Volunteers

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

Trial design

30 participants in 1 patient group

injection volume

Other group

Description:

block success or failure determines a 5 ml decrease or increase for the subsequent patient, respectively

Treatment:

Other: lumbar plexus block