The Impact of Left Stellate Ganglion Block on Systemic Inflammation and Neuromodulation in CABG Surgery.

((82)) patients scheduled to undergo elective CABG by the same surgical team will be allocated randomly by computer-generated random numbers into two equal groups (n= 41). Study groups: Group S (Stellate Ganglion Block Group): Patients will receive an ultrasound-guided Left stellate ganglion block prior to induction of general anesthesia. The block will be performed at the C6 level under strict aseptic precautions using 5 mL of 0.25% bupivacaine. Successful blockade will be confirmed by the appearance of ipsilateral Horner\'s syndrome. Group C (Control Group): Patients will receive standard perioperative care without stellate ganglion block and will undergo the same anesthetic and surgical management protocol as Group S.