Isolated facial nerve palsy following <scp><i>Ixodes holocyclus</i></scp> tick envenomation

Kobuch, Sophie; Matar, Elie; Fung, Victor S.C.

doi:10.1111/1742-6723.13811

Cited by 1 publication

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References 6 publications

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“…23 The third was a 3-year-old boy with generalised signs of TP, left pupillary dilatation and right facial paralysis, with the SOTA on the scalp but the side not recorded. 23 Intriguingly, in all other reports in human patients with facial paralysis attributable to a single Ixodes holocyclus tick on the head, [24][25][26][27][28][29] the SOTA was always on the same side of the facial paralysis, suggesting the SOTA in the aforementioned third case with anisocoria may have been contralateral to the abnormal pupil and thereby may accord with observations in the present study.…”

Section: Discussionsupporting

confidence: 88%

Static anisocoria in cats and dogs with naturally occurring tick paralysis (Ixodes holocyclus)

Holland¹

2023

Aust Veterinary J

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ObjectiveTo characterise the novel occurrence and neuro‐ophthalmological features of static anisocoria in cats and dogs with tick paralysis (TP) (Ixodes holocyclus) due to a single tick located remote from the head and neck.DesignObservational case series with retrospective analysis.MethodsMedical records were reviewed from 69 cats and 169 dogs treated for TP from a suburban veterinary hospital in Newcastle, New South Whales, between September 2005 and October 2021.ResultsAnisocoria was observed in 2/18 (11.1%) cats and 3/30 (10.0%) dogs with a single tick located remote from the head and neck. These proportions were not different when compared within species to 4 of 28 (14.3%) cats and 16 of 98 (16.3%) dogs with aniscocoria with a single tick located on the head and neck region (P = 1 and 0.56 respectively). Anisocoria arose from pupillary efferent dysfunction and included unilateral oculoparasympathetic dysfunction (internal ophthalmoplegia) in one dog, unilateral oculosympathetic dysfunction (Horner's syndrome) in one cat and one dog, and a combination of bilateral, but asymmetric, oculosympathetic and oculoparasympathetic dysfunction in one cat and one dog.ConclusionIt is proposed that anisocoria in cases of TP with a tick located remote from the head and neck is due to an intrinsic latent asymmetry in the safety factor for pupillary efferent function that is unmasked by a systemically distributed holocyclotoxin inhibiting neural transmission within this system, and this is the prevailing pathomechanism, rather than a direct local effect, underscoring anisocoria with a tick located on the head or neck.

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Section: Discussionsupporting

confidence: 88%

Static anisocoria in cats and dogs with naturally occurring tick paralysis (Ixodes holocyclus)

Holland¹

2023

Aust Veterinary J

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Isolated facial nerve palsy following Ixodes holocyclus tick envenomation

Cited by 1 publication

References 6 publications

Static anisocoria in cats and dogs with naturally occurring tick paralysis (Ixodes holocyclus)

Static anisocoria in cats and dogs with naturally occurring tick paralysis (Ixodes holocyclus)

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