Efficacy and Safety of Adding Atracurium to Percaruncular Block for High Myopes Undergoing Cataract Surgery
Status:
Completed
Trial end date:
2016-05-01
Target enrollment:
Participant gender:
Summary
There are several local anesthetic techniques available for cataract surgery and the choice
depends on patient, surgical and operator factors. The eyes of patients with axial myopia
(the eye globe is abnormally elongated) have thin wall (sclera), limited space for needle
insertion for local anesthetic injection between the globe and the orbit and out-pouching of
the back of the eye (staphyloma). These factors increased the risk of perforation following
conventional needle techniques of eye block The current study technique is per-caruncular
injection (the needle insertion site is between the nasal side of the globe and bony orbit)
which may provide a safer alternative to the conventional needle techniques for myopic
patients. The space of injection is devoid of blood vessels moreover, myopic staphylomata are
infrequently located on the nasal side of the globe.
Local injection of muscle relaxant added to local anesthetic solution may provide earlier
onset of eye muscle paralysis thus earlier onset of favorable surgical condition than local
anesthetic solution alone.
The current study will demonstrate the effect of adding low dose atracurium (a muscle
relaxant) to local anesthetic mixture in providing early onset of eye muscle paralysis and
favorable surgical condition in per-caruncular technique of eye block in high myopes
undergoing cataract surgery.