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Ahmed glaucoma valve implantation

Eye Care estimated about CNY 15000-25000

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Description

Surgical procedure implanting an Ahmed or similar aqueous shunt device to drain aqueous humor and lower intraocular pressure in refractory glaucoma.

Main Uses

Primary clinical use is surgical management of refractory glaucoma uncontrolled by medications, laser therapy, or trabeculectomy — including neovascular, uveitic, congenital, and secondary glaucomas. Specifically indicated when high failure risk exists for trabeculectomy (e.g., prior failed filtration surgery, active inflammation, young age, Afro-Caribbean ancestry). Ahmed valves are often preferred in high-risk, inflamed eyes due to built-in flow restrictor; Baerveldt implants are used where sustained, lower long-term IOP is desired and inflammation is quiescent.

Normal Range

Not applicable — Ahmed and Baerveldt glaucoma drainage device implantation is a surgical procedure, not a diagnostic laboratory test with numerical values or reference ranges. Intraocular pressure (IOP) postoperatively is typically targeted at 6–18 mmHg, but this reflects therapeutic goal, not a 'normal range' of the surgery itself.

Low Values - Possible Causes

N/A — The procedure itself does not yield quantitative 'low values'. However, abnormally low postoperative IOP (<5 mmHg) may result from: 1) Early postoperative hypotony due to excessive aqueous outflow, 2) Tube obstruction by vitreous or fibrin, 3) Overfiltration from inadequate scleral patch graft coverage, 4) Choroidal effusion or detachment, 5) Leakage at tube- or plate-site.

High Values - Possible Causes

N/A — The procedure does not produce 'high values', but elevated postoperative IOP (>21 mmHg) may occur due to: 1) Tube obstruction (e.g., by blood, fibrin, or iris), 2) Plate encapsulation/fibrosis (especially with Baerveldt devices), 3) Failure of initial bleb formation or early scarring, 4) Inadequate intraoperative tube positioning or ligation release timing (for ligated Ahmed valves), 5) Concurrent uncontrolled inflammation or neovascular glaucoma.

glaucoma drainage implant Ahmed valve surgery Baerveldt glaucoma implant glaucoma shunt procedure refractory glaucoma surgery

estimated about CNY 15000-25000