Impact of Thoracic Epidural Versus Serratus Anterior Plane Block Versus Erector Spinae Plane Block on Incidence of PTPS

Inclusion Criteria: * Age (18-65) Years * Physical status American Society of Anesthesiologists Classification II, III * Patients undergoing lobectomy through lateral thoracotomy * Body mass index (BMI): (20-40) kg/m2 Exclusion Criteria: * Patient refusal. * Age \<18 years or \>65 years * Body mass index (BMI) \<20 kg/m2 and \>40 kg/m2 * Known sensitivity or contraindication to drugs used in the study * Contraindication to regional anesthesia e.g. local infection at site of introduction, pre-existing peripheral neuropathies and coagulopathy. * Pregnancy. * Physical status American Society of Anesthesiologists Classification IV * patients on chronic analgesic therapy (daily morphine ≥30 mg or equivalent dose of other opioids or tramadol or any medication for neuropathic pain) * patients with a history of drug abuse * patients with neuropsychiatric diseases; patients with a history of chronic pain syndromes that may enhance sensitivity to pain, for example, fibromyalgia * patients with a history of thoracic surgery through lateral thoracotomy; and patients with recurrent chest malignancies within 3 months. * All patients who developed severe intra- or post-operative bleeding or required postoperative mechanical ventilation were also excluded from the study. * Thoracic spine disorders or deformity.