Long term effect on intraocular pressure of phacotrabeculectomy compared to trabeculectomy.
OBJECTIVE
To compare the long term mean intraocular pressure (IOP) reduction after non-augmented single site phacotrabeculectomy with that after trabeculectomy and to determine the relation between preoperative IOP and IOP reduction.


METHODS
A group of 44 consecutive patients with chronic open angle glaucoma who underwent phacotrabeculectomy were matched to a trabeculectomy control group and the results of surgery were compared. Linear regression analysis of preoperative IOP and IOP reduction was undertaken.


RESULTS
The mean IOP reduction was significantly less in the phacotrabeculectomy group (6.7 (SD 2.1) mm Hg) than in the trabeculectomy group (11.0 (1.4) mm Hg) (p=0.0017). There was a significant difference in surgical success between the groups. The preoperative IOP was significantly related to the postoperative reduction in IOP in both groups (p<0.001).


CONCLUSIONS
In elderly white patients with chronic open angle glaucoma, phacotrabeculectomy is not as effective as trabeculectomy in reducing IOP. In both procedures the magnitude of IOP reduction is proportional to the preoperative IOP.
Lochhead
J
J
Oxford Eye Hospital, Woodstock Road, Oxford OX2 6HE, UK.
Casson
R J
RJ
Salmon
J F
JF
D000368:Aged; D002908:Chronic Disease; D005260:Female; D005902:Glaucoma, Open-Angle / Q000401:mortality / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D011182:Postoperative Care; D012189:Retrospective Studies; D014130:Trabeculectomy / Q000379:methods*; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology