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Long-term drift and timolol therapy: possible role for pulsed therapy
M Batterbury1, S P Harding, D Wong
1St. Paul's Eye Hospital, Liverpool, UK.
International Ophthalmology
|September 1, 1992
Summary
Discontinuing topical betablockers and using dipivefrin may restore sensitivity to betablocker therapy, improving intraocular pressure control in ocular hypertension patients. This suggests a potential strategy for long-term glaucoma management.
Area of Science:
- Ophthalmology
- Pharmacology
Background:
- Topical betablockers are common treatments for ocular hypertension.
- Long-term use can lead to reduced efficacy, known as treatment drift.
- Adrenergic agonists might enhance betablocker resensitization during treatment breaks.
Purpose of the Study:
- To investigate if a temporary switch from timolol to dipivefrin enhances subsequent timolol efficacy in ocular hypertension.
- To evaluate the effect of dipivefrin monotherapy on intraocular pressure (IOP).
Main Methods:
- Nine patients with ocular hypertension on timolol were studied.
- Timolol was discontinued and replaced with dipivefrin for four weeks.
- This cycle was repeated, with IOP measured bi-weekly.
Main Results:
- Re-introducing timolol significantly lowered IOP by 3.2 mmHg (first cycle) and 3.4 mmHg (second cycle) within two weeks.
- Dipivefrin treatment alone did not cause a significant change in IOP.
Conclusions:
- A temporary holiday from betablockers with dipivefrin may restore sensitivity to timolol therapy.
- This approach could be a viable strategy to manage long-term intraocular pressure control in ocular hypertension.