Transversus Thoracis Muscle Plane Block for Sternotomy Pain in Cardiac Surgery

After general anaesthesia, transversus thoracis plane (TTP) block, a kind of regional block will be performed near both sides of the sternum under ultrasound guidance using either levobupivacaine or normal saline to both groups of patients. The end point for injection is the fluid spread along the plane just superficial to the transversus thoracis muscle, together with the downward displacement of the pleura.