الفهرس 
Anatomy of the OrbitOnly 14 pages are availabe for public view
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Abstract
V
itreoretinal surgeries are known to be lengthy and pain during surgery is variable depending on the type and the ongoing step of the surgery.
So, it was to some extent common that the patient can experience pain either during surgery or postoperatively, that lead us to augment the peribulbar block intra-operatively to minimize pain on expense of increasing the IOP and losing the patient’s confidence and ability to lie down still below the drapes which is annoying in all circumstances.
Many adjuvants were tried before to help to improve the potency of the block and increase the duration of analgesia and akinesia intra- and post-operatively.
Dexmedetomidine was used before in neuroaxial blocks and regional blocks and proved to decrease the onset of anesthesia and akinesia and increase the duration of analgesia and akinesia in all these blocks.
In this study we tried small doses of dexmedetomidine as adjuvants with tight range increments in combination with the usual mixture of the local anesthetics used in peribulbar block (25µg and 50µg) comparing it with a control group to detect precisely which dose will be the best.
We found out that the use of 50µg dexmedetomidine was the best comparatively with the other groups in our study, although other studies showed satisfied outcome when 25µg dexmedetomidine was used.