Inclusion Criteria:  ASA physical status I-II, weighing 50-90 Kg with Body Mass Index (BMI) 18.5- 29.9 kg/m2  Exclusion Criteria:  ASA physical status ≥III, pregnancy, body mass index >30 kg/m2, preoperative opioid consumption, patient's refusal and contraindications of the use of spirometry or either of the truncal blocks under the study including; respiratory, cardiac, neurological, mental or coagulation disorders.