The current study is designed to investigate the analgesic potentials of two modalities of abdominal blocks where local anesthetics is injected in the fascial planes of the abdominal muscles to anesthetize the nerves supplying the abdomen in patients undergoing upper abdomial surgeries. the two modalities are the rectus sheath block (RSB) and the external oblique intercostal plane block (EOIPB). The investigators are going to use the ultrasound to identify the muscles and inject the local anesthetics. The investigators suggest that the EOIPB might provide better pain control when compared to RSB.
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Time to first request for rescue analgesia
Timeframe: Time in hours from end of surgery to first dose of morphine administered up to 24 hours postoperatively