Immediate increase in aqueous humour endothelin 1 concentration and intra-ocular pressure after argon laser trabeculoplasty in the rabbit.
OBJECTIVE
To investigate the immediate changes of aqueous humour endothelin 1 (ET-1) concentration and intra-ocular pressure (IOP) after argon laser trabeculoplasty (ALT) in the rabbit.


METHODS
Standard ALT was performed in one eye of 11 pigmented rabbits. IOP was measured with a Tono-Pen-2 tonometer before treatment, under general anaesthesia. Postlaser IOP measurements followed by aqueous humour aspiration were performed under general anaesthesia 30 and 60 min after treatment in 6 and in 5 animals, respectively.


RESULTS
The aqueous humour ET-1 concentration was significantly higher (55.0 pg/ml) after ALT than in the contralateral eyes without laser treatment (8.2 pg/ml, p = 0.001). IOP increased significantly after ALT (p = 0.007) but remained unaltered (p = 0.10) in the contralateral eyes without treatment. No statistically significant difference was found either in postlaser IOP elevation or in interocular ET-1 difference between the groups.


CONCLUSIONS
The results suggest that in the rabbit the increase in aqueous humour ET-1 concentration after ALT is immediate, detectable even 30 min after the laser treatment, followed by no further increase during the second 30-min period after ALT, and associated with an immediate postlaser IOP elevation within 1 h after ALT. These findings may suggest a similar response to ALT in the human eye, since a similar immediate IOP elevation is frequently observed after ALT in the clinical practice.
Holló
G
G
1st Department of Ophthalmology, Semmelweis University, Budapest, Hungary.
Lakatos
P
P
Vargha
P
P
D000818:Animals; D001082:Aqueous Humor / Q000378:metabolism*; D019332:Endothelin-1 / Q000378:metabolism*; D007429:Intraocular Pressure; D053685:Laser Therapy; D011817:Rabbits; D014065:Tonometry, Ocular; D014129:Trabecular Meshwork / Q000601:surgery*; D014130:Trabeculectomy
D019332:Endothelin-1