The aim of this study is to evaluate the analgesic efficacy and safety of adding dexmedetomidine and dexamethasone to bupivacaine in rhomboidal intercostal and subserratus (RISS) block for patients undergoing modified radical mastectomy compared to bupivacaine only.
Rhomboid intercostal block (RIB); a new interfascial plane block involves the triangle of auscultation that's bounded medially by inferior a part of the trapezius, inferiorly by the superior border of latissimus dorsi, and laterally by the medial border of the scapula. The local anaesthetic spreads between the rhomboid major and therefore the intercostal fascia at the extent of T6-T7 and provides analgesia of T3-T8 dermatomes. Aiming to expand dermatomal coverage, a new modification of Rhomboid Intercostal and Sub-Serratus block (RISS) is performed by advancing the ultrasound probe caudally and laterally distal to the inferior angle of the scapula, the second injection apply between the serratus and intercostal muscle fascia. The RISS block is a novel ultrasound-guided block that has been shown to provide analgesia from T2-T11 dermatomes. Dexmedetomidine is a potent selective α 2 adrenoceptor agonist that was reported in many previous studies as an adjunct to regional and general anesthesia, with significant prolongation of the duration of sensory block, motor block and analgesia, and accelerate the time to onset of sensory and motor block when added to a local anesthetic. Dexamethasone is a potent long-acting steroid that has shown efficacy as an adjuvant to local anesthetics in various studies. It enhances peripheral nerve blocks when added to local anesthetics, providing better quality of anesthesia as well as postoperative analgesia. The mechanism by which dexamethasone prolong the duration of local anesthetics are not completely understood; however, some studies demonstrated that dexamethasone exerts its action through reducing the release of inflammatory mediators and by inhibiting discharge of C-fibers.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Enrollment
70
The patient will be placed in lateral position. A linear ultrasound transducer of frequency 6-12 MHz will be placed medial to the lower border of the scapula in a sagittal plane. A 38-mm 22-gauge will be inserted under real-time in-plane from craniocaudal between the rhomboid major and intercostal muscles. After negative aspiration, single injection of 10 ml of the local anesthetic mixture will be administered at the T6 7 level. The spread of local anesthetic solution under the rhomboid muscle will be visualized by ultrasonography. Then the ultrasound probe will be moved caudally and laterally to identify the tissue plane between the serratus anterior and external intercostal muscle for the sub-serratus block at T 8-9 level. The needle will be advanced from its previous position and a further of 10 ml of the local anesthetic mixture will be injected.
Fentanyl (1 μg/kg), propofol (2-3mg/kg) and atracurium (0.3-0.5 mg/kg) will be injected intravenously 3-5 minutes after oxygenation. A single-lumen endotracheal tube will be used to complete ventilation. The ventilator ventilation mode is volume control mode, and the patient's end-expiratory carbon dioxide level is maintained at 35-40 mmHg throughout the anesthesia process. During the anesthesia maintenance phase, 2% sevoflurane mixed with 60% oxygen. After general anaesthesia induction, all patients will receive RISS block with different local anesthetic drug mixture according to randomization.
AFCM Egypt
Cairo, Cairo Governorate, Egypt
Time of first request of analgesia.
calculated from the time of complete injection of local anesthetics till the numerical rating scale (is more than or equals 3
Time frame: 24 hours
Total amount of morphine consumption
Time frame: 24 hours
mean arterial blood pressure
Time frame: 24 hours
heart rate
Time frame: 24 hours
Numerical rating scale
The 11-point numeric scale ranges from '0' representing one pain extreme (e.g. "no pain") to '10' representing the other pain extreme (e.g. "pain as bad as you can imagine" or "worst pain imaginable").
Time frame: 24 hours
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Patients will receive general anaesthesia and RISS block with 20 ml of 0.25% bupivacaine + 1 Mcg/kg dexamedatomidine in 2 mL.
Patients will receive general anaesthesia and RISS block with 20 ml of 0.25% bupivacaine + 8mg dexamethasone in 2 mL.
Patients will receive general anaesthesia and RISS block with 20 ml of 0.25% bupivacaine+ 2 mL normal saline.