SAEM Clinical Images Series: A Curious Case of Anisocoria

anisicoria

A 3-month-old male with no past medical history was brought to the emergency department for evaluation of newly asymmetric pupils. The infant appeared to be asymptomatic per parents, without any behavior changes or associated symptoms noted. The patient’s mother noticed her son’s left pupil was dilated and unresponsive to light the morning of presentation. The father had applied a prescription antiperspirant containing glycopyrronium to his axillae the previous evening but denied any known exposure to the infant.

Physical Exam

Vitals: BP 85/66; HR 143; RR 42; SpO2 100%; T 98.3°F

Constitutional: No distress, well appearing.

HENT: Left pupil fixed and dilated to 7 mm in the light and the dark; right pupil 2 mm and reactive in the light, 5 mm in the dark. EOM intact bilaterally. No stigmata of trauma. Normal TMs bilaterally.

Neck: Normal range of motion.

Cardiovascular: Normal rate, regular rhythm and normal heart sounds.

Pulmonary: Breath sounds normal, no respiratory distress.

Abdominal: Soft, nontender, nondistended.

Neurological: Alert. Moving all 4 extremities spontaneously. Normal muscle tone. Normal suck and Moro reflexes.

Skin: Normal. No piloerection or sweating. No bruising or lesions.

Laboratory Data

No labs drawn. Head CT was obtained, which showed no acute intracranial pathology.

Case Question: Can you identify the cause of this patient's anisocoria?

Ophthalmology consultation was sought, and an ophthalmologic exam demonstrated unremarkable slit lamp and fundal exams, with no afferent pupillary defect by reverse. The patient’s anisocoria was ultimately attributed to inadvertent glycopyrronium exposure from his father’s prescription antiperspirant, Qbrexza. The patient’s father later noted that he cradled the patient against his chest after applying the antiperspirant, and was not wearing a shirt at the time

Case Question: What physical exam tests can be helpful in differentiating pharmacologic vs non-pharmacologic causes of anisocoria?

Pilocarpine, a cholinergic antagonist that stimulates pupillary constriction, can be used to test mydriatic pupils. Pilocarpine drops will not reverse pharmacologically-induced anisocoria (1). Conversely, it will correct mydriasis caused by tonic pupil or third nerve palsy (2). In our patient’s case, pilocarpine administration did not result in pupillary constriction, supporting the diagnosis of drug-induced anisocoria.

Case Discussion

Take-Home Points

Evaluation of acute anisocoria in the pediatric population can be challenging due to its wide range of potential etiologies including traumatic, neurologic, inflammatory, and pharmacologic causes. Though most commonly physiologic, anisocoria may represent a pediatric emergency due to the potential for underlying trauma or neurovascular compromise and thus a thorough neurologic exam and history is crucial (1, 20).
Inadvertent exposure to drugs such as glycopyrronium, a topical antiperspirant with anticholinergic properties, has been implicated in the pathogenesis of anisocoria in both adult and pediatric patients via inhibition of acetylcholine at the pupillary sphincter muscle (3-13). Other documented pharmacological causes of anisocoria include nebulized ipratropium bromide and scopolamine (14-19).
EM Clinicians should consider exposure-related anisocoria in the differential diagnosis of infant patients with acutely asymmetric pupils. In the absence of concerning neurologic findings, identification of potential drug exposures may help to minimize unnecessary testing and radiation exposure, sparing certain patients from time-intensive and costly interventions.

References

1. Falardeau J. Anisocoria. Int Ophthalmol Clin. 2019;59(3):125-39.
2. Payne WN, Blair K, Barrett MJ. Anisocoria. StatPearls. Treasure Island (FL): StatPearls Publishing Copyright © 2023, StatPearls Publishing LLC.; 2023.
3. Pecha JD, Yen KG, Moisiuc A, et al. Anisocoria secondary to antiperspirant wipes in a pediatric population: a case series. J aapos. 2022;26(1):42-3.
4. Chabicovsky M, Winkler S, Soeberdt M, et al. Pharmacology, toxicology and clinical safety of glycopyrrolate. Toxicol Appl Pharmacol. 2019;370:154-69.
5. Coleman MJ, Tomsak RL. A 15-year-old girl with variable anisocoria. Digit J Ophthalmol. 2014;20(1):13-4.
6. Micieli R, Micieli JA. Dilated Pupil in a Patient With Hyperhidrosis. JAMA. 2019;322(3):264-5.
7. Radotra A, Baneke A, Paul B. Mydriasis secondary to use of glycopyrrolate cream. Br J Hosp Med (Lond). 2019;80(12):736.
8. Pashaei-Marandi A, Assam JH, Arnold A, et al. Reversible anisocoria due to inadvertent ocular exposure to topical anticholinergic treatment for primary axillary hyperhidrosis. Can J Ophthalmol. 2019;54(6):e300-e2.
9. Siscos SM, Figenshau K, Rajpara A. Use of gloves when applying topical glycopyrronium for treatment of primary axillary hyperhidrosis. J Am Acad Dermatol. 2020;83(4):e275.
10. Kaufman AR, Gulati S, Curnyn KM. Pharmacologic anisocoria secondary to topical glycopyrronium for axillary hyperhidrosis: an emerging clinical presentation. Can J Ophthalmol. 2020;55(5):464.
11. Al-Holou SN, Lipsky SN, Wasserman BN. Don’t Sweat the Blown Pupil: Anisocoria in Patients Using Qbrexza. Ophthalmology. 2020;127(10):1381.
12. Kaufman AR, Gulati S, Pula JH, et al. Pharmacologic Mydriasis Secondary to Topical Glycopyrronium Tosylate Cloths: Clinical Characterization From a Multicenter Analysis. J Neuroophthalmol. 2022;42(4):530-4.
13. Sandhu M, Eisenstein K. Mydriasis and anisocoria in a pediatric hyperhidrosis patient with interesting findings in the family cat. Pediatr Dermatol. 2023;40(1):210-1.
14. Derinoz-Guleryuz O, Fidanci İ, Men-Atmaca Y. Nebulized Ipratropium Bromide-induced Anisocoria: Why Is Anisocoria Observed?. Iran J Allergy Asthma Immunol. 2021;20(1):125-128.
15. Kokulu K, Öner H, Özen C, Eroğlu SE, Altunok İ, Akça HŞ. Pharmacologic anisocoria due to nebulized ipratropium bromide: A diagnostic challenge. Am J Emerg Med. 2019;37(6):1217.e3-1217.e4.
16. Pejic R, Klaric B. Transient anisocoria in a patient treated with nebulized ipratropium bromide. Am J Ophthalmol Case Rep. 2017;7:11-13. Published 2017 Apr 12.
17. Thiele EA, Riviello JJ. Scopolamine patchinduced unilateral mydriasis. Pediatrics. 1995;96(3 Pt 1):525.
18. Rodor F, Cottin C, Jouglard J. Transdermal scopolamine and mydriasis. Therapie. 1989;44(6):447-448.
19. Rubin MM, Sadoff RS, Cozzi GM. Unilateral mydriasis caused by transdermal scopolamine. Oral Surg Oral Med Oral Pathol. 1990;70(5):569-570.
20. Gross JR, McClelland CM, Lee MS. An approach to anisocoria. Curr Opin Ophthalmol. 2016;27(6):486-492.

Copyright

Images and cases from the Society of Academic Emergency Medicine (SAEM) Clinical Images Exhibit at the 2023 SAEM Annual Meeting | Copyrighted by SAEM 2023 – all rights reserved. View other cases from this Clinical Image Series on ALiEM.