Quality Study of Anesthetic Technique on Breast Cancer Surgery

Inclusion Criteria: * Patient has a physical status between ASA I and III * Female * 18 - 70 years of age * Patients able to read a newspaper in Chinese. * Elective unilateral wide excision/simple mastectomy and SLNB/ALND * Patient has signed an informed consent * Without contraindication of GA or PVB * Body mass index (BMI) less than 24 kg/m2 Exclusion Criteria: * ASA \> III * inability to provide informed consent * Bleeding disorders * Contraindications to nonsteroidal anti-inflammatory drugs (NSAIDs) * Allergy to amide-type local anesthetics or NSAIDs * Infection at the thoracic paravertebral injection site * Pregnancy or breast-feeding * Severe spine or chest wall deformity * body mass index equal to or more than 24 kg/m2 * patients with major psychosis or drug and alcohol abuse * patients with a history of significant neurological, psychiatric, neuromuscular, cardiovascular, pulmonary, renal or hepatic disease * Patients with significant visual impairment or other physical disability that precludes complete cooperation