Suprascapular and Axillary Versus Interscalene Blocks Regarding Phrenic Affection in Shoulder Surgeries

Inclusion Criteria: * Patients aged between 18 - 60 years old. * Both sexes. * ASA physical status classes I - II. * Body mass index: 18-35 kg/ m2. Exclusion Criteria: * Infection at site of injection. * Psychiatric illness. * Central Nervous System Diseases like (epilepsy, stroke …etc.) or neurological disease affecting patient's upper limb. * Dependence on opiates and psycho-dynamic medications. * Moderate to severe pulmonary disease. * Coagulopathy and bleeding disorders. * Allergies to drug used (Bupivacaine 0.5%). * Previous surgery at site of injection and history of radiotherapy.