الفهرس 
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Abstract
Sub-Tenon’s block is a popular technique for ophthalmic local anesthesia, providing good quality analgesia and ocular akinesia. It involves the use of a blunt rather than sharp needle, so the risks of globe perforation and brainstem anaesthesia are reduced •
Bupivacaine is amino amid drug with a butyl group on the piperidine nitrogen atom of the molecule. It provides a good motor block and relatively less sensory block. It is a potent cardiotoxic and neurotoxic effects. Ropivacaine is a relatively ammo amid local anesthetic with a propyl group on piperidine nitrogen atom of the molecule.
Ropivacaine is an effective drug with long duration of action than bupivacaine. It has the potential advantage of reduced cardiovascular and neurological toxicity compared with other local anesthetics that are commonly used for Sub¬Tenon’s block.
In this study we tried to evaluate the clinical efficacy and side effects of ropivacaine versus bupivacaine with the Sub-Tenon’s block of the eye for cataract extraction in which 30 patients were recruited and divided into 2 groups.
• Group (A) (ropivacaine group): patients will be injected with ropivacaine 0.75% with 150 IU hyalourindase for Sub-Tenon’s block in cataract extraction.
• Group (B) (bupivacaine group): patients will be injected with bupivacaine 0.5% with 150 IU hyalourindase for Sub- Tenon’s block in cataract extraction.
The following items were assessed:
Heart rate and automated noninvasive blood pressure were monitored every 5min. The block score were completed by the surgeon at the end of surgery. The Ocular movements were assessed using the scoring system described by Brahma and colleagues at 2, 4, 6, 8 and 10 min and at the end of surgery. Any complications occurred perioperative and postoperative were assessed.
The results revealed that Sub-Tenon’s anaesthesia with 0.75% ropivacaine and 150 IU hyalourindase is a safe technique for eye surgery and provides more effective block with rapid onset, better akinesia and longer duration than 0.5% bupivacaine and 150 IU hyalourindase.