The authors retrospectively reviewed the medical records of consecutive patients with glaucoma who underwent trabeculectomy with mitomycin C between June 2005 and December 2010 to determine the risk factors for hyphema after surgery. Of the 420 patients, 104 (24.8%) had hyphema. Their study identified neovascular glaucoma and anticoagulant or antiplatelet medication at trabeculectomy as being significant risk factors, subgroup analysis demonstrated that neovascularisation in the anterior chamber angle and anticoagulant or platelet medication were risk factors for postoperative hyphema whereas preoperative injection of bevacizumab reduced the likelihood. 

Risk factors for hyphema after trabeculectomy with 
mitomycin C.
Kojima S, Inatani M, Shobayashi K, et al.
JOURNAL OF GLAUCOMA
2014;23(5):307-11.
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Lorraine North

Frimley Park Hospital, Frimley, UK.

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