Management of A-V Pattern ' Strabismus
Geilan Mohamed Retia El-Sayed Shokier;
Abstract
Alphabet pattern strabismus is the presence of significant incomitance between upgaze• and downgaze in patients with esotropia (ET), exotropia (XT) or with no horiZontal misalignment in the primary position (Diamond,
1999).
In V pattern there is at least 15 PD greater exodeviation or lesser esodeviation in gaze up 30° than gaze down 30° while in A pattern there is at least 10 PD lesser exodeviation or greater esodeviation in gaze up 30° than gaze down 30° (Diamond, 1999).
There are various theories to explain the etiology of the A-V patterns. The oblique muscle dysfunction is the most popular theory at present (Nakamura et al, 1991). Other causes of A-V patterns include horizontal muscle dysfunction (Villaseca, 1961), vertical recti dysfunction as proposed by Brown in 1953, anomalous muscle insertion (Nakamura et al, 1991), anato!IIica! abnormalities of the orbit and facial bones (Lemon de Brown, 1988) and sensory deprivation (Guyton & Weingarten, 1994).
Different modalities were described for the management of A-V pattern strabismus as weakening and strengthening of the horizontal recti, vertical transposition of the horizontal recti, slanting muscle insertion of the horizontal recti, weakening and strengthening of -the - vertical recti, horizontal transposition of the vertical recti and weakeningand strengthening of the oblique muscles.
The aim of this study was to evaluate the effectiveness of two of the surgical modalities used in the management of the A-V pattern strabismus (namely oblique muscle surgeries and horizontal recti muscle
1999).
In V pattern there is at least 15 PD greater exodeviation or lesser esodeviation in gaze up 30° than gaze down 30° while in A pattern there is at least 10 PD lesser exodeviation or greater esodeviation in gaze up 30° than gaze down 30° (Diamond, 1999).
There are various theories to explain the etiology of the A-V patterns. The oblique muscle dysfunction is the most popular theory at present (Nakamura et al, 1991). Other causes of A-V patterns include horizontal muscle dysfunction (Villaseca, 1961), vertical recti dysfunction as proposed by Brown in 1953, anomalous muscle insertion (Nakamura et al, 1991), anato!IIica! abnormalities of the orbit and facial bones (Lemon de Brown, 1988) and sensory deprivation (Guyton & Weingarten, 1994).
Different modalities were described for the management of A-V pattern strabismus as weakening and strengthening of the horizontal recti, vertical transposition of the horizontal recti, slanting muscle insertion of the horizontal recti, weakening and strengthening of -the - vertical recti, horizontal transposition of the vertical recti and weakeningand strengthening of the oblique muscles.
The aim of this study was to evaluate the effectiveness of two of the surgical modalities used in the management of the A-V pattern strabismus (namely oblique muscle surgeries and horizontal recti muscle
Other data
| Title | Management of A-V Pattern ' Strabismus | Other Titles | مناجزة حالات أ - ف المصحابة للحول | Authors | Geilan Mohamed Retia El-Sayed Shokier | Issue Date | 2006 |
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