Timolol increased retrobulbar flow velocities in untreated glaucoma eyes but not in ocular hypertension

Ingar C. Bergstrand, Anders Heijl, Per Wollmer, Flemming Hansen, Alon Harris

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Purpose: To investigate retrobulbar blood flow velocities and the effects of topical timolol treatment in eyes with newly detected, previously untreated open angle glaucoma or ocular hypertension. Methods: Fifteen eyes with open angle glaucoma (OAG) and 12 eyes with ocular hypertension (OH), in the same number of patients, all untreated and newly detected, were examined with colour Doppler imaging of retrobulbar vessels before and after 1 month of topical timolol treatment (0.5% Timoptic® BID). Results: Baseline central retinal artery end diastolic velocity was lower (48%, p=0.0002) and resistive index higher (7.6%, p=0.018) in the OAG group than in the OH group. In the glaucoma group mean end diastolic velocity increased by 41%, (p=0.006) while resistive index decreased by 5.8%, (p=0.02) on treatment, while no significant changes were seen in the OH group. Blood flow velocities in the ophthalmic artery did not change with treatment. Baseline IOP and IOP reduction did not differ between OAG and OH group. Conclusion: Peripheral resistance to blood flow was found to be increased in untreated glaucoma eyes as compared to a similar group of eyes with ocular hypertension. Timolol treatment diminished resistance significantly in the glaucoma group, but not in the ocular hypertension group. Thus the two groups responded differently to timolol treatment. The reaction to IOP lowering treatment could indicate defective autoregulation in the glaucoma group.

Original languageEnglish
Pages (from-to)455-461
Number of pages7
JournalActa Ophthalmologica Scandinavica
Volume79
Issue number5
DOIs
StatePublished - 2001

Fingerprint

Timolol
Ocular Hypertension
Glaucoma
Open Angle Glaucoma
Blood Flow Velocity
Therapeutics
Ophthalmic Artery
Retinal Artery
Vascular Resistance
Homeostasis
Color

Keywords

  • Autoregulation
  • Blood flow
  • Glaucoma
  • Glaucoma medications
  • Optic nerve
  • Timolol

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Timolol increased retrobulbar flow velocities in untreated glaucoma eyes but not in ocular hypertension. / Bergstrand, Ingar C.; Heijl, Anders; Wollmer, Per; Hansen, Flemming; Harris, Alon.

In: Acta Ophthalmologica Scandinavica, Vol. 79, No. 5, 2001, p. 455-461.

Research output: Contribution to journalArticle

Bergstrand, Ingar C. ; Heijl, Anders ; Wollmer, Per ; Hansen, Flemming ; Harris, Alon. / Timolol increased retrobulbar flow velocities in untreated glaucoma eyes but not in ocular hypertension. In: Acta Ophthalmologica Scandinavica. 2001 ; Vol. 79, No. 5. pp. 455-461.
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