Primarily, This study aims to compare between interscalene block alone versus combined with superior truncus block in producing diaphragmatic paralysis and Secondarily aims to evaluate
1. Effect on the pulmonary function. 2. Duration of the sensory and motor block. 3. Postoperative analgesic consumption. 4. Any complications or side effects during shoulder surgery.
ASA (American Society of Anesthesiologists) I, II physical status.
Aged between 20 and 65 years.
Male or female.
Body Mass index (BMI): 18-30 kg/m3.
Allergy to local anesthetics.
Infection at the injection site.
Coagulation disorders.
Respiratory diseases ( Acute or Chronic) or Chest trauma.