Continuous Ultrasound Guided Erector Spinae Plane Block vs Thoracic Paravertebral Block

General Anesthesia will be induced with Fentanyl (1-2 μg/kg), Propofol (2-3 mg/kg), and Atracurium (0.5-0.8 mg/kg). Pressure controlled Volume guarantee Ventilation mode will be used to maintain O2 Saturation Above 98% and End tidal co2 Around 30-35 mmHg. Anesthesia will be maintained with Isoflurane 1.2 Minimum Alveolar Concentration inhalation after induction Group A: Patients will receive Loading dose of 20 ml 0.25% bupivacaine then continuous infusion U/S-Guided TPVB of 5 ml/h of 0.125% bupivacaine started through the catheter before the surgical procedure intraoperative and Group B: Patients will receive Loading dose of 20 ml 0.25% bupivacaine then continuous U/S-Guided ESPB of 5 ml/h of 0.125% bupivacaine started through the catheter before the surgical procedure intraoperative.

Inclusion criteria

• Eligible 40 patients will be older than 21 years old with American society of anesthesia physical status I& II scheduled for elective thoracotomy

Exclusion criteria

• Patients who are:
• Uncooperative.
• Having allergy to any of the study drugs.
• Known abuse of alcohol or medication.
• Having Local infection at the site of injection or systemic infection.
• Pregnancy.
• With coagulation disorders or on anticoagulation therapy