الفهرس 
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Abstract
The Transversus Abdominis Plane (TAP) Block is a local anesthetic block used to provide analgesia to the anterior and lateral abdominal wall. Rafi et al (2001) and McDonnell et al (2004) were the first to describe this novel abdominal field block. They described an anatomical landmark technique and provided evidence of blockade to the mid/lower thoracic and upper lumbar spinal nerves as they travelled in the fascial plane between the transversus abdominis and internal oblique muscles. Hebbard et al (2007) have subsequently described an ultrasound-guided approach to the TAP block. In this study we used ultrasound for posterior TAP block to insert aneedle in the plain and inject 20ml of bupivacaine with or with out hylase according to the group.
50 patients were devided into 2groups the first one receive bupivacaine only and the second receive bupivacaine with hylase,comparison in pain score and in consumption of analgesia between them was done with follow up to vital signs 24hrs postoperative.
This study shows that addion of hylase to bupivacaine increase the efficacy of local anesthetic.
CONCLUSIONS
TAP block is a new technique that improves analgesia and may be an effective tool of multimodal postoperative analgesia after abdominal surgery. Lots of clinical trials have demonstrated its superiority over standard protocols regarding postoperative pain control. TAP block reduces significantly the consumption of opioid in the first 24-h and increases patient’s satisfaction after abdominal surgeries.