Monitoring of Intensity of Stimulation and Injection Pressure in US Guided Peripheral Nerve Block According to Anatomic Needle Type Position

Observational Study : Minimal Intensity of Stimulation During Ultrasound Guided Peripheral Nerve Block According to Anatomic Needle Type Position

The purpose of the study is define the minimal intensity of stimulation range at which the needle is closed to the nerve without penetrating its surface (epineurium layer) in ultrasound guided peripheral nerve blockade

The needle is placed at the target under ultrasound guidance the nerve stimulator is turned on and the intensity increased until motor response is observed the Minimum Intensity Observation (MIS) is recorded before injection of local anesthetic

Inclusion Criteria:

• Patient who need a Orthopedic surgery
• Peripheral nerve block
• More or equal to 18 years old
• I to III ASA classification status
• Benefit from an insurance regimen

Exclusion Criteria:

• severe coagulopathy
• allergy to local anesthetics
• local cutaneous lesion