DOWNSHOOT IN INFRA-ADDUCTION IN STRABISMUS WITH A-PATTERN. POST SURGICAL EVOLUTION FOLLOWING SELECTED SUPERIOR OBLIQUE SURGICAL WEAKENING PROCEDURES
Autor/es:
URRETS ZAVALIA, E; JUAN I. TORREALDAY; F. ESPOSITO,; SERRA H M; URRETS-ZAVALIA JA
Lugar:
MIAMI
Reunión:
Congreso; ARVO 2009; 2009
Resumen:
We evaluated the occurrence of postsurgical, true or
pseudo, superior oblique muscle overaction (SOOA) following treatment of A-pattern
strabismus and its possible causes.
Between October 1995 and December 2006 30 patients with A-pattern
strabismus and symmetric SOOA were treated with 3 different superior oblique
muscle (SOM) weakening surgical procedures according to degree of presurgical
anisotropia and SOOA. 19 patients underwent a posterior partial tenectomy
(PPT), 6 a
temporal tenotomy (TT) at 4mm from scleral insertion and 5 a posterior transposition
recession (PTR). A high
prevalence of postsurgical DSIA in patients with A-pattern treated with
selective surgical procedures performed on SOM was observed. Apparently all 3
different surgical procedures used were useful in reducing horizontal action of
SOM, with less effect on its vertical action. Eliminating A-pattern, natural
vertical movements promoted by SOM, such as depression in infra-adduction and
slightly elevator in infra-abduction would become more evident, giving the
impression of SOM hyperfunction exacerbation. TT the less traumatic procedure
shows the lowest incidence of DSIA.
