PURPOSE: To determine the effect of vertical displacement of muscle insertions on the surgical dose-response relationship in @entity1 undergoing bilateral medial rectus recessions. METHODS: Retrospective chart review of @entity1 undergoing bilateral medial rectus recessions for correction of @entity5971 with or without vertical displacement for A or V patterns. @entity1 were clustered into A pattern, V pattern, and "simple" (no pattern) groups. Strabismus angle at distance and near before and after surgery was recorded. Surgical dose-response relationships (in prism diopters/mm) were determined at the 6-month follow-up visit and compared. RESULTS: A total of 55 @entity1 (28 male and 27 female @entity1 ; mean age, 6.9 years; range, 2-17 years) were included. Of these, 28 had either A pattern (18) or V pattern (10), and 27 were in the simple group. Mean preoperative angle of deviation was 34/\ at distance and 40/\ at near. The surgical dose-response relationship was significantly greater (at both distance and near) in the A pattern group (2.43/\/mm, distance [p=0.005]; 2.76/\/mm, near [p=0.04]) than in the simple group (1.56/\/mm, distance; 2.03/\/mm, near). The surgical response in the V pattern group (1.96/\/mm, distance [p=0.34]; 2.03/\/mm, near [p=0.94]) was not significantly different from the simple group. CONCLUSIONS: Upward displacement of the medial rectus muscles increased the surgical dose/response relationship in @entity1 with A-pattern @entity5971 . A similar effect was not observed with @entity572 in @entity1 with V-pattern strabismus. Surgeons should be aware of this enhanced response when planning surgery for A-pattern @entity5971 .

Effect of vertical transposition of the medial rectus muscle on primary position alignment in infantile XXXX with A- or V-pattern strabismus.

@entity1 :: ('9606', 'Species') :: ['Patients', 'patients'] @entity572 :: ('MESH:D006617', 'Disease') :: ['downward displacement'] @entity5971 :: ('MESH:D004948', 'Disease') :: ['congenital esotropia', 'esotropia']
@entity5971 :: (MESH:D004948,Disease) :: ['esotropia']
