It has been proven that PECS II and ESP both supply effective analgesia in the first 24 hours after mastectomy. But they do so by different mechanishms.
This study is to survey that ESP and PECS II may supply acute and chronic analgesia by reducing pain scores in the first 24 hours and 3 months after the surgery, also the comparison of the analgesic activity among themselves for acute / chronic pain and opioid consumption will be searched.
In this study patients are divided into three groups. Patients in PECS group will have PECS II block in a separate section from the operating rooms (PNB practice room). In addition, patient controlled analgesia (PCA) will be used in the first 24 hours postoperatively.
Patients in ESP group will have ESP block in a separate section from the operating rooms (PNB practice room). In addition, PCA will be used in the first 24 hours postoperatively.
Patients in control group will not be performed nerve block. Only general anesthesia (GA) will be performed in the operation room. In addition, PCA will be used in the first 24 hours postoperatively.
