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Response to phenylephrine testing in upper eyelids with ptosis.

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Summary

Topical phenylephrine 10% effectively elevates ptotic upper eyelids by stimulating Müller's muscle. This response is independent of levator function, though severity of ptosis influences the degree of eyelid elevation.

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Area of Science:

  • Ophthalmology
  • Oculoplastics
  • Pharmacology

Background:

  • Ptosis, or drooping of the upper eyelid, can result from various causes, including aponeurotic dehiscence.
  • Müller's muscle plays a role in eyelid elevation and is a target for surgical repair of certain types of ptosis.
  • Phenylephrine is a sympathomimetic agent known to stimulate alpha-adrenergic receptors, potentially causing Müller's muscle contraction.

Purpose of the Study:

  • To assess the efficacy of topical phenylephrine 10% in elevating ptotic upper eyelids.
  • To determine if levator function or ptosis severity influences the response to phenylephrine.
  • To investigate phenylephrine's role in stimulating Müller's muscle contraction.

Main Methods:

  • Retrospective review of 77 ptotic eyelids in 47 patients with aponeurotic dehiscence.
  • Administration of one drop of topical phenylephrine 10% to each eyelid.
  • Measurement of margin-to-reflex distance 1 (MRD1) and levator excursion pre- and post-administration, with photographic documentation.

Main Results:

  • A significant majority of ptotic eyelids (78%) showed some degree of elevation in response to phenylephrine.
  • Eyelid elevation ranged from 0.5 mm to over 2 mm in 78% of cases.
  • A positive correlation was observed between milder ptosis severity and a greater response to phenylephrine; however, levator function did not correlate with the response.

Conclusions:

  • Topical phenylephrine 10% is an effective agent for inducing upper eyelid elevation in ptotic eyelids, primarily through Müller's muscle stimulation.
  • The response to phenylephrine is largely independent of the patient's levator muscle function.
  • Phenylephrine testing can be a valuable diagnostic and potentially therapeutic tool in managing ptosis, particularly in cases considered for Müller's muscle resection.