Experimental Group |
Transverse Thoracic Muscle Plane Block and Rectus Sheath Block |
20 ml of Bupivacaine 0.25% in each site of injection with a total 4 sites of injection |
Single injections 10-20 minutes just before the skin incision |
A linear ultrasound probe is placed in the transverse plane 1 cm lateral to the edge of the sternum in the 3rd or 4th intercostal space. The internal intercostal and transverse thoracic muscles, as well as the internal thoracic artery and vein, are identified over the pleura. A 50- mm block needle is placed in the interfacial plane between the transverse thoracic and the inner intercostals muscles using the in-plane technique, and localization is confirmed before injection by a 3-mL saline hydro-dissection (by seeing the downward motion of the pleura). Next, 20 mL of 0.25% bupivacaine is injected bilaterally |
25 |
|
Control Group |
General anesthesia without nerve blocks |
The general anesthesia (GA) is induced by administering 0.3 mg/kg of Midazolam, 3-5 mg/kg of Thiopental sodium, and 0.5 mg/kg of Atracurium. Fentanyl is given as a 3-5 mcg/kg bolus just before the induction |
Maintanance of GA by inhalational anesthetics with IV infusion of Atracurium (dose: 0.1-0.3 mg/kg/hr) and boluses of opioids (mainly Fentanyl in the form of 50-100 mcg/bolus) |
A linear ultrasound probe is placed in the transverse plane 1 cm lateral to the edge of the sternum in the 3rd or 4th intercostal space. The internal intercostal and transverse thoracic muscles, as well as the internal thoracic artery and vein, are identified over the pleura. A 50- mm block needle is placed in the interfacial plane between the transverse thoracic and the inner intercostals muscles using the in-plane technique, and localization is confirmed before injection by a 3-mL saline hydro-dissection (by seeing the downward motion of the pleura). In the control group, using saline instead of local anesthetic (Bupivacaine) is done |
25 |
Active-Treatment of Control Group |