Related Experiment Videos
Botulinum toxin A-induced protective ptosis in corneal disease
C M Kirkness1, G G Adams, P N Dilly
1Department of Clinical Ophthalmology, Moorfields Eye Hospital, London.
Abstract:
Botulinum toxin A produces a temporary, flaccid ptosis when injected into the levator palpebrae superioris muscle. The resulting protective ptosis was used to aid healing in 21 cases of indolent ulceration, and, prophylactically, in 4 cases of neuroparalytic keratitis. Of the indolent ulcers, 90% healed completely. In all but one case, the cornea was covered completely by the lid and complete ptosis was produced in 75% of cases in an average of 3.6 days, lasting for 16 days on average before recovery began. Recovery of levator function was complete in 8.5 weeks on average. Superior rectus underaction was seen in 68% of cases but this recovered completely in all cases in an average of 6 weeks. Impression cytology showed a trend toward normal conjunctival morphology as healing progressed.
Insights
Botulinum toxin A injections created temporary eyelid drooping (ptosis) to protect the cornea, successfully healing 90% of indolent corneal ulcers. This safe, temporary ptosis aided corneal healing and showed promising results for eye conditions.
Area of Science:
- Ophthalmology
- Neurology
- Pharmacology
Background:
- Botulinum toxin A is known to induce temporary flaccid ptosis.
- Indolent corneal ulcers and neuroparalytic keratitis pose significant challenges to ocular surface health.
Purpose of the Study:
- To evaluate the efficacy of botulinum toxin A-induced ptosis in promoting the healing of indolent corneal ulcers.
- To assess the prophylactic use of botulinum toxin A in neuroparalytic keratitis.
Main Methods:
- Botulinum toxin A was injected into the levator palpebrae superioris muscle to induce controlled ptosis.
- The study included 21 cases of indolent ulceration and 4 cases of neuroparalytic keratitis.
- Corneal coverage, ptosis duration, levator function recovery, and superior rectus function were monitored. Impression cytology was used to assess conjunctival changes.
Main Results:
- Ninety percent of indolent corneal ulcers healed completely.
- Complete corneal coverage by the eyelid was achieved in all but one case.
- Complete ptosis occurred in 75% of cases within an average of 3.6 days, lasting approximately 16 days.
- Levator function recovery averaged 8.5 weeks, and superior rectus underaction (seen in 68% of cases) resolved completely in all patients within 6 weeks.
- Impression cytology indicated a trend toward normal conjunctival morphology during healing.
Conclusions:
- Botulinum toxin A-induced ptosis is an effective therapeutic strategy for indolent corneal ulcers.
- The temporary ptosis provides protective corneal coverage, facilitating ulcer healing.
- Botulinum toxin A demonstrates potential for prophylactic use in neuroparalytic keratitis with a favorable safety profile.