Pain has a wide spectrum of effects on the body. Inadequately controlled postoperative pain may have harmful physiologic, psychological consequences which potentially increase the morbidity and mortality (4,5). It has been recognized that inadequately treated postoperative pain may lead to chronic pain which is often misdiagnosed and neglected (6,7). Chronic postsurgical pain reported in 20% of patients, 6 months after nephrectomy (8).