Prospective Comparative Study Between Ultrasound-guided Continuous Erector Spinae Plane Block and the Use of Intravenous Patient Controlled Analgesia for Management of Pain in Patients With Multiple Fracture Ribs

Exclusion Criteria

• •• patient refusal
• •* History of chronic pain or daily use of analgesics
• •* History of psychiatric disorder or inability to understand the consent form or how to use a visual analog scale (VAS) for pain measurement
• •* Severe renal or hepatic dysfunction
• •* Allergy to any required drug
• •* Second thoracic surgery
• •* Local infection at the injection site
• •* Spinal deformity
• •* head injury
• •* lung complications related to trauma ( pneumothorax , haemothorax , lung collapse).
• •* need of mechanical ventilation