The pectoral block is a recently developed regional anesthetic technique that can be used for the treatment of postoperative pain after breast surgery. Injection of local anesthetic between the major and the minor pectoral muscles is defined as the pectoral (PEC) 1 block. This block has not been well characterized in terms of its blocking effects on motor and sensitive nerves (medial and lateral pectoral nerves and intercostal nerves). This clinical trial is divided into two sections: a volunteer study and a patient study. For the volunteer study, the aim is to assess the sensory territory affected by injection of local anesthetics through a PEC 1 block and to assess motor function in terms of strength of adduction of the affected limb using a dynamometer. In a prospective, randomized, controlled and double blind study, the aim is to assess the postoperative pain relieving properties of the PEC 1 block in patients undergoing bilateral breast augmentation surgery.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Enrollment
20
Under echoguidance, injection of the substance of interest between the major and minor pectoral muscles.
Treatment group
Placebo group
CHUM
Montreal, Quebec, Canada
CISSS des Laurentides
Saint-Jérôme, Quebec, Canada
Postoperative pain score at rest
Pain score using a verbal numerical scale (0-10) in one breast (bupivacaine) compared to the other breast (placebo)
Time frame: Within the first 10 min after arrival to the postanesthesia care unit (PACU)
Postoperative pain score on movement
Pain score using a verbal numerical scale (0-10) in one breast (bupivacaine) compared to the other breast (placebo)
Time frame: Within the first 10 min after arrival to the postanesthesia care unit (PACU)
Postoperative pain score at rest
Pain score using a verbal numerical scale (0-10) in one breast (bupivacaine) compared to the other breast (placebo)
Time frame: 15 min, 30 min, 60 min, 12h and 24 h after time of arrival in the PACU and immediately after discharge from PACU
Incidence of nausea and/or vomiting
Presence or absence of nausea and/or vomiting
Time frame: 15 min, 30 min, 60 min, 12h and 24 h after time of arrival in the PACU and immediately after discharge from PACU
Surgical bleeding
Presence or not of surgical bleeding from wounds, drains eventually leading to surgical exploration
Time frame: After surgery for 24 hours
Hematoma
Presence or absence of hematoma at PEC 1 block injection
Time frame: After surgery for 24 hours
Postoperative well-being
Analgesic intake
Time frame: At 24 hours after surgery
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