Analgesic Efficacy of SPSIP Block Versus Paravertebral Block Following Thoracotomy

Inclusion Criteria: * Scheduled to undergo thoracotomy * ASA physical status I-III according to the American Society of Anesthesiologists classification * Able to understand the study procedures and provide written informed consent Exclusion Criteria: * Declines or is unable to provide informed consent * Allergy or hypersensitivity to local anesthetics or opioids * Known or suspected coagulopathy * Infection at the injection site * History of thoracic surgery * Severe cardiovascular disease * Hepatic or renal failure * Pregnant, suspected pregnancy, or breastfeeding Significant neurological or psychiatric disorder that may interfere with study participatio