Intraocular pressure following peritomy and wet-field coagulation.
The changes in intraocular pressure (IOP) following peritomy and wet-field coagulation of 10 rabbit eyes and 7 human cataractous eyes were investigated. The IOP difference before and after 180-degree and 360-degree wet-field coagulation on rabbit eyes showed an average increase of 11.0 +/- 5.8 mmHg and 25.8 +/- 7.1 mmHg(mean +/- SD), respectively (p less than 0.05, p less than 0.01). The IOP of both groups in rabbit eyes were elevated for 2 to 3 days postoperatively and then became normal by the 7th postoperative day. The IOP difference before and after 180-degree peritomy and wet-field coagulation in human cataractous eyes showed an average increase of 8.4 +/- 5.8 mmHg(mean +/- SD)(p less than 0.05). The outflow facility was poor immediately following wet-field coagulation but then improved gradually by means of tonography and concentration changes of anterior chamber neutral-red. Histologically, there was endothelial cell damage, congestion, and red blood cell extravasation of the episcleral and intrascleral vessels at one day after wet-field coagulation in the light microscopic findings. Recanalization of the episcleral and intrascleral capillaries was noted 3 days after wet-field coagulation and was completed 3 weeks after wet-field coagulation. There was poor plastic infusion through the trabecular spaces in the one-day postoperative group compared to the control group by scanning electron micrograph. In conclusion, we have to bear in mind the possibility of an IOP rise after wet-field coagulation following peritomy for cataract and retinal surgery.
Lee
K W
KW
Department of Ophthalmology, College of Medicine, Yeungnam University, Daegu, Korea.
D000818:Animals; D001082:Aqueous Humor / Q000502:physiology; D002387:Cataract Extraction; D003228:Conjunctiva / Q000601:surgery* / Q000648:ultrastructure; D006801:Humans; D007429:Intraocular Pressure; D008028:Light Coagulation; D008855:Microscopy, Electron, Scanning; D011817:Rabbits; D013524:Surgical Flaps; D014065:Tonometry, Ocular; D014129:Trabecular Meshwork / Q000648:ultrastructure