Ultrasound Guided Rhomboid Intercostal Plane Block Versus Thoracic Erector Spinae Plane Block in Upper Abdominal Surgery

Inclusion Criteria: * Patients aged 21-65 years. * Both gender. * American Society of Anesthesiologists (ASA) classification I-II. * Presented for elective upper abdominal surgery. Exclusion Criteria: * Patients refused to participate. * Patients with known or suspected allergy to the used medication. * Patients with preoperative chronic pain. * Patients with major cardiac, renal, respiratory, or hepatic disease. * Patients with potential risk of coagulopathy. * Obese patients with body mass index (BMI) \>35.