title: Circadian IOP-lowering efficacy of travoprost 0.004% ophthalmic solution compared to latanoprost 0.005%.
abstract: OBJECTIVE
  The primary objective of this study was to determine the intraocular pressure- (IOP) lowering efficacy over two consecutive 24-h periods of travoprost 0.004% ophthalmic solution (Travatan) compared to latanoprost 0.005% (Xalatan) dosed once daily in patients with primary open-angle glaucoma or ocular hypertension.
  
  
  METHODS
  This was a double-masked trial conducted at the Hospital Clínico San Carlos, Madrid, Spain. The primary objective of this study was to determine the IOP lowering efficacy of travoprost and latanoprost. During the eligibility visit, patients' IOP was measured throughout two consecutive 24-h periods every 4 h. Patients were then randomized to travoprost or latanoprost (one drop at 8 p.m. daily for 2 weeks). Sixty-two patients were randomized (travoprost n = 32; latanoprost n = 30). IOP was measured at week 2 every 4 h throughout two 24-h periods. All measurements were taken in both supine and sitting positions with the aid of Perkins applanation tonometry. Limitations of the study include a small sample size (due to the difficulty in recruiting patients in a study of this type) which enrolled only Caucasian patients and a short study duration. However, with 25 subjects per group, there was at least 90% power to detect a mean IOP change from baseline of 2.9 mmHg and 80% power to detect a difference of 2.5 mmHg between treatments.
  
  
  RESULTS
  Patients on travoprost therapy showed lower mean IOP levels than those on latanoprost. This difference was statistically significant (p < 0.05) at 12, 16, 20, 24, 36, 40, and 48 h after the last dose for the supine position. The mean IOPs in the supine position throughout the first and the second 24-h period of the week 2 visit as well as for the 48-h visit were statistically lower (p < 0.05) for the travoprost group. Adverse events were mild and included hyperemia and corneal staining. Travoprost and latanoprost were both well tolerated.
  
  
  CONCLUSIONS
  Mean IOP values were significantly lower for patients on travoprost for the majority of time points in the supine position.
authors.affiliation: Ophthalmology Department, Hospital Clínico San Carlos, Universidad Complutense, Madrid, Spain. mherrerad@sego.es
authors.forename: J
authors.initials: J
authors.lastname: García-Feijoo
authors.forename: J M
authors.initials: JM
authors.lastname: Martínez-de-la-Casa
authors.forename: A
authors.initials: A
authors.lastname: Castillo
authors.forename: C
authors.initials: C
authors.lastname: Méndez
authors.forename: A
authors.initials: A
authors.lastname: Fernández-Vidal
authors.forename: J
authors.initials: J
authors.lastname: García-Sánchez
mesh_terms: D000368:Aged; D002940:Circadian Rhythm / Q000502:physiology*; D003008:Cloprostenol / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives*; D004311:Double-Blind Method; D005260:Female; D005901:Glaucoma / Q000188:drug therapy* / Q000503:physiopathology; D006801:Humans; D007429:Intraocular Pressure / Q000187:drug effects* / Q000502:physiology; D000077338:Latanoprost; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000188:drug therapy* / Q000503:physiopathology; D009883:Ophthalmic Solutions / Q000008:administration & dosage / Q000009:adverse effects; D011461:Prostaglandins F, Synthetic / Q000008:administration & dosage* / Q000009:adverse effects; D000069557:Travoprost
chemical_list: D009883:Ophthalmic Solutions; D011461:Prostaglandins F, Synthetic; D003008:Cloprostenol; D000077338:Latanoprost; D000069557:Travoprost