Distribution Circumferential Versus Non Circumferential of Mepivacaine in the Median and Ulnar Nerves

Complexo Hospitalario Universitario de A Coruña124 enrolled

Overview

1. Evaluation of the efficacy of the circumferential versus non circumferential distribution of mepivacaine around the median and ulnar nerves. 2. Evaluation the onset of action of mepivacaine in circumferential versus non circumferential distribution around the median and ulnar nerves. 3. Spread of mepivacaine after injection guided by ultrasonography. 4. Complications of both anesthetic techniques in postoperative time.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

QUADRUPLE

Enrollment

124

Conditions

Anesthesia

Interventions

Circumferential spread of the mepivacaine ultrasonographic guided around the median and ulnar nerves at the elbowPROCEDURE

Homogeneous spread of 6 ml of mepivacaine 1% around the median and ulnar nerves in each one using several needle passes and active hydrodissection

Non circumferential spread in ultrasound-guided median and ulnar nerves blockPROCEDURE

Asymmetric spread of 6 ml of mepivacaine 1% in contact with median and ulnar nerves block in each one, using only one needle pass

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Scheduled patients for surgery of carpal tunnel including patients in ASA I-III status, without exclusion criteria. The principal investigator study and/or other designated site staff will obtain written informed consent from all research patients. Exclusion Criteria: * Abnormal bleeding, infection in the punction side, allergy or other problems with the medication of the study, muscular or nerve diseases, patients \< 18 years old, pregnancy, cognitive disease or reject of the patient

Locations (1)

Complexo Hospitalario Universitario A Coruña. Hospital Abente y Lago

A Coruña, A Coruña, Spain

Outcomes

Primary Outcomes

Efficacy and onset of action

Sensory block will be assessed as a loss of cold sensation elicited by a cold wet cotton swab in the areas of the medial and ulnar nerves by comparison with contralateral hand. Sensory block will be clasiffied as follows: 0, anesthesia; 1, hyposthesia; 2, normal sensation. Motor function will be tested as according to a modified Bromage score: 0, no motor blokade; 1, weak response against resistence; 2, complete motor blockade. Motor and sensory blockades will be assessed by a blinded observer at 5, 15, 30 mins after local anesthetic injection and on arrival in the recovery room.

Time frame: On arrival in the recovery room

Secondary Outcomes

Complications in postoperative time

Since the nerve block to the hospital outcome will be registered potencial block-related complications. At the first postoperative day, each patient will be called by phone, to report the time at first onset of pain in the operative site and lack of residual postoperative neurologic symptoms, postoperative nausea and vomiting, and hospital readmission (for severity of pain or bleeding or other reasons)

Time frame: 24 hours postoperative time

Data from ClinicalTrials.gov

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