Comparison of the effects of travoprost, latanoprost and bimatoprost on ocular circulation: a 6-month clinical trial.
OBJECTIVE
To study the effect of three prostaglandin F(2)-alpha (PG) analogues on retrobulbar blood flow velocity in previously untreated patients with primary open-angle glaucoma (POAG) or ocular hypertension (OHT), using colour Doppler ultrasound.


METHODS
Sixty newly diagnosed patients with POAG or OHT were randomly assigned to travoprost 0.004% (n = 12 with POAG, n = 8 with OHT), latanoprost 0.005% (n = 11 with POAG, n = 9 with OHT) and bimatoprost 0.03% (n = 13 with POAG, n = 7 with OHT) treatment groups in a double-masked fashion. At baseline examination, blood pressure, heart rate and intraocular pressure (IOP) were recorded. Peak-systolic and end-diastolic velocities were measured in the ophthalmic (OA), central retinal (CRA) and temporal short posterior ciliary arteries (PCA). The resistive index (RI) and ocular perfusion pressure (OPP) were determined for each treatment group. After a treatment period of 6-months, all procedures were repeated.


RESULTS
There were no significant differences in age (53 +/- 14 years in the travoprost group, 51 +/- 14 years in the latanoprost group, 53 +/- 11 years in the bimatoprost group), gender (11 men, nine women; 11 men, nine women; 13 men, seven women, by group, respectively), or clinical diagnosis (POAG or OHT) among treatment groups (p > 0.05). A significant decrease in IOP (baseline: 26.4 +/- 3.3 mmHg, 26.8 +/- 1.3 mmHg, 25.8 +/- 1.8 mmHg, respectively; month 6: 20.9 +/- 1.9 mmHg, 20.8 +/- 2.4 mmHg, 18.3 +/- 1.2 mmHg, respectively; p < 0.0001) and an increase in OPP (baseline: 33.7 +/- 3.8 mmHg, 33.5 +/- 3.2 mmHg, 33.9 +/- 2.6 mmHg, respectively; month 6: 40.2 +/- 3.5 mmHg, 39.9 +/- 3.1 mmHg, 41.7 +/- 2.6 mmHg, respectively; p < 0.0001) were verified in all three groups during the study period. Mean baseline RI values for the CRA in the travoprost group and the OA in the latanoprost group were both 0.7 +/- 0.1 mmHg and both values were statistically significantly lower at 6 months (0.6 +/- 0.1 mmHg in both groups; p = 0.002, p < 0.0001, respectively). In the bimatoprost group there was no statistically significant difference in haemodynamic parameters over the study period (p > 0.05).


CONCLUSIONS
Our results suggest that the three PG analogues significantly reduce IOP and increase OPP in patients with POAG or OHT. Topical travoprost and latanoprost significantly reduce the RI of the CRA and OA, respectively. We were unable to determine any effect of topical bimatoprost on ocular haemodynamics.
First Eye Clinic, Ankara Numune Education and Research Hospital, Ankara, Turkey. ozlemgkoz@gmail.com
Ozlem Gurbuz
OG
Koz
Arzu
A
Ozsoy
Alper
A
Yarangumeli
S Kenan
SK
Kose
Gulcan
G
Kural
D000287:Administration, Topical; D000328:Adult; D000577:Amides / Q000008:administration & dosage / Q000627:therapeutic use*; D000069580:Bimatoprost; D001783:Blood Flow Velocity / Q000187:drug effects; D019842:Ciliary Arteries / Q000000981:diagnostic imaging / Q000503:physiopathology; D003008:Cloprostenol / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000627:therapeutic use; D004311:Double-Blind Method; D005123:Eye / Q000098:blood supply; D005260:Female; D005902:Glaucoma, Open-Angle / Q000000981:diagnostic imaging / Q000188:drug therapy* / Q000503:physiopathology; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D007429:Intraocular Pressure / Q000187:drug effects; D000077338:Latanoprost; D008055:Lipids / Q000008:administration & dosage / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000000981:diagnostic imaging / Q000188:drug therapy* / Q000503:physiopathology; D009880:Ophthalmic Artery / Q000000981:diagnostic imaging / Q000503:physiopathology; D011461:Prostaglandins F, Synthetic / Q000008:administration & dosage / Q000627:therapeutic use*; D012039:Regional Blood Flow; D012161:Retinal Artery / Q000000981:diagnostic imaging / Q000503:physiopathology; D000069557:Travoprost; D016896:Treatment Outcome; D018615:Ultrasonography, Doppler, Color; D014655:Vascular Resistance / Q000187:drug effects
D000577:Amides; D008055:Lipids; D011461:Prostaglandins F, Synthetic; D003008:Cloprostenol; D000077338:Latanoprost; D000069580:Bimatoprost; D000069557:Travoprost