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pain in premature infants if used alone. Postoperative pain following mastectomy is often severe and pain management is necessary. We evaluated the analgesic efficacy of continuous pectoral nerve block (PEC) in comparison with that of the continuous thoracic paravertebral block (TPV and the intravenous opioid analgesia in patients scheduled for modified radical mastectomy (MRM). A total of 90 female patients aged 20 to 70 years, American Society of Anesthesiologists (ASA) I to III, undergoing unilateral MRM were randomly allocated in