Vitrectomy Maneuvers Impact

When looking at the failure rates for gas and silicone tamponade, it is logical that silicone tamponade leads to an incredibly higher remaining silicone rate than gas tamponade. The rate of remaining silicone with a gas tamponade is however not 0, which means that the eye was re operated after the primary procedure. As far as the effective failure rate is concerned, silicone tamponade appears to be less effective than gas tamponade, but keep in mind that this results concern all the PVR stage grouped together.

Therefore in order to get a better comparison between gas and silicone tamponade, it is necessary to compare the failure rates at each PVR stage. The choroidal detachment and hypotony were also excluded. It then appears that the supremacy of gas over silicone is particularly obvious for PVR stage C1.

A multiple correspondence analysis was performed in order to see if there were groups with common characteristics based on vitrectomy and external techniques. What we had guessed thanks to the graphics you have just seen was confirmed : when a vitrectomy is performed, it is often one of the two following combinations that is performed : Perist + low cutting speed+gas+segmental tamponade or Venturi pump + high cutting speed+silicone tamponade+360 buckle.