Evaluation of Topical Anesthesia Alone Versus Combined With Intracameral LIdocaine 1%
Completed
Cairo University
N/A
2014-08-01
General anesthesia may be non preferable in many patients undergoing Phakic IOL surgery, as
most of the surgeries take 5-10 minutes at maximum.Traditionally, retrobulbar injections were
performed deep into the orbit, but it is now accepted that peribulbar injections using
shorter needles are safer. In the last few years, continuing concern over the rare but
serious complications of sharp needle blocks has led to increasing interest in the use of
sub-Tenon's blocks utilizing a blunt cannula 1-5.
Even with the use of blunt canulae sub-Tenon's block, serious problems can still occur,
especially in myopic patients with large axial length. In phakic IOL surgery,topical
anesthesia has been used successfully for years. Topical anesthesia has several advantages
over regional infiltrative techniques, the foremost of which is the abolition of any risk of
inadvertent injury of the globe or orbital contents 6,7,8. It has a high rate of patient
satisfaction, but still there are some patients that experience intraoperative discomfort.
In this study we compared topical anesthesia alone with topical anesthesia plus intracameral
lidocaine 1% in patients undergoing posterior chamber phakic intra ocular lens;Vision
implantable collamer lens ( ICL/toric ICL) surgery.Intracameral anesthesia is a common
adjunct to topical anesthesia in anterior segment surgery9. It probably provides sensory
blockage of the iris and ciliary body and thereby relieves discomfort experienced during IOL
placement. Intracameral lidocaine alone dilates the pupil well 10 and this is believed to be
because of the direct action of lidocaine on the iris, which in turn causes muscle
relaxation.
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