Thoracotomy surgery is the most painful of all surgical procedures. Inadequate postoperative pain control in these patients may cause serious morbidity related to pulmonary, cardiovascular and emotional systems. Erector Spinae Plane Block (ESPB) was first described in 2016 and, it is frequently used for postoperative analgesia in thoracic surgery. Intravenous lidocaine exhibit analgesic activity through both the peripheral and central nervous system. Intravenous lidocaine has been shown to reduce postoperative pain intensity and accelerate postoperative recovery in many surgeries.

The investigators aimed to compare the effect of lidocaine infusion and erector spinae plane block on postoperative opioid consumption and pain scores.

Inclusion Criteria:

• American Society of Anesthesiologist's physiologic state I-III patients undergoing thoracotomy surgery

Exclusion Criteria:

• chronic pain, bleeding disorders, renal or hepatic insufficiency, non cooperative patient,
• Patients with allergies to one of the drugs used in the study.