Abstract：
BACKGROUND:Reports of acquired strabismus caused by injection of local anesthetics during cataract surgery have increased recently. The authors proposed a mechanism to explain the occurrence of strabismus with apparent overactive muscles after cataract surgery. METHODS:The authors studied 19 patients in whom strabismus developed after cataract surgery. Prism and cover test in the diagnostic positions of gaze and forced-duction testing were used to identify the affected muscles. RESULTS:The deviation was greater in the field of action of the presumed tight muscle in 16 of 19 patients. An ipsilateral hypertropia with superior rectus muscle overaction subsequently developed in two patients with an initial hypotropia. An overaction of the ipsilateral lateral rectus muscle causing an exotropia developed in one patient with initially limited abduction. CONCLUSIONS:Myotoxicity from direct injection of local anesthetics into an extraocular muscle probably causes transient paresis followed by segmental contracture of the involved muscle. Mild contractures result in strabismus with a motility pattern of an overactive muscle. Larger amounts of contracture lead to restrictive strabismus. The risk of strabismus may be decreased by administering the local anesthetic into sub-Tenon space using a blunt-tipped cannula when performing cataract surgery.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Capó H,Guyton DLdoi
10.1016/s0161-6420(96)30623-4subject
Has Abstractpub_date
1996-05-01 00:00:00pages
721-30issue
5eissn
0161-6420issn
1549-4713pii
S0161-6420(96)30623-4journal_volume
103pub_type
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