Effect of interposition maneuver during cannula removal on vitreous incarceration rate in vitrectomized eyes measured by ultrasound biomicroscopy.
OBJECTIVE
To evaluate the influence of the cannula removal maneuver on the postoperative incisional vitreous incarceration using an experimental model of vitrectomized eye.


METHODS
Prospective, experimental, randomized and observer-masked experimental study in which 23-gauge transconjunctival sutureless vitrectomy was performed through oblique sclerotomies in cadaveric pig eyes. Once the vitrectomy was finished, one of the superior cannulas was removed with the light probe introduced through it, and the other cannula was extracted with the cannula plug inserted. Postoperative incisional vitreous incarceration was evaluated by ultrasound biomicroscopy (UBM).


RESULTS
60 eyes included. Considering the 60 superior sclerotomies whose cannulas were extracted with the light pipe inserted, vitreous incarceration was observed in 35% of them. On the other hand, 71.6% of the incisions whose cannulas were removed with the cannula plug inserted showed vitreous incarceration (p = 0.00013).


CONCLUSIONS
Interposing the light probe through the cannula when it is removed seems to reduce the postoperative wound vitreous incarceration rate in our experimental model.
Department of Ophthalmology, University Hospital Principe de Asturias, Alcalá de Henares (Madrid), Spain.
Javier
J
Benitez-Herreros
Lorenzo
L
Lopez-Guajardo
Cristina
C
Camara-Gonzalez
Agustin
A
Silva-Mato
D000818:Animals; D057785:Catheters; D020878:Device Removal / Q000379:methods*; D004195:Disease Models, Animal; D033401:Microscopy, Acoustic; D008866:Microsurgery; D011446:Prospective Studies; D012599:Sclerostomy / Q000295:instrumentation*; D013552:Swine; D014821:Vitrectomy; D014822:Vitreous Body / Q000000981:diagnostic imaging* / Q000601:surgery