Type of Surgery
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Last updated: 02/17/2009
For 70–90% of patients, the implant is functional one year after surgery. After three years, 60% remain functional. The failure rate for Seton implants is 4–8% per year, and differ for valved and non-valved implants. For the non-valved implants,...
the success rate is 90% at one year, but drops to 60% at two years. At least 66% of valved Seton tube implants are effective at one year, but this drops to 34% at six years. Choroidal detachment is a complication in one-third of these patients.
Strabismus is more common with the Krupin valve as opposed to the Ahmed valve, possibly because it is larger.
For high-risk glaucoma patients, the success rate for Seton tube surgery is approximately 50%. The rate of failure increases 10% with each year. High-risk patients include those who are aphakic (have no intraocular lens), have neovascular glaucoma (which develops from uncontrolled diabetes and hypertension), have congenital glaucoma, and who have had other unsuccessful glaucoma surgeries. Although the success rate for neovascular glaucoma is 56% at 18 months, eventually 31% of neovascular glaucoma patients will lose all vision except for light perception.
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Tube-shunt surgery, or Seton tube shunt glaucoma surgery, is a surgical method to treat glaucoma. Glaucoma is a potentially blinding disease affecting 2–3% of the United States population. The major known cause of glaucoma is a relative increase in intraocular pressure, or IOP. The purpose of glaucoma treatment, whether medical or surgical, is to lower the IOP.
Aqueous fluid is made continuously, and circulates throughout the eye before draining though channels in the eye's anterior chamber. When too much fluid is made, or it is not drained sufficiently, the IOP rises. This fluid build-up can lead to glaucoma. Normal intraocular pressure is under 21 mm/Hg. Glaucoma develops at IOPs higher than 21mm/Hg. However, approximately 20% of glaucoma patients never have pressures higher than 21 mm/Hg.
From http://www.surgeryencyclopedia.com/St-Wr/Tube-Shunt-Surgery.html
Other Information
Approximately 56% of all patients achieve results of 20/20 or better and over 90% achieve 20/40 or better (which is good enough to drive without corrective lenses in most regions).1 Those with moderate to high myopia (greater than 7 diopters) have a lesser chance of achieving that result. As technique and technology improve, the results continue to improve.
From: Eye Surgery Education Council
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