Photic headshaking in the horse: 7 cases.

John E Madigan, G. Kortz, Christopher J Murphy, L. Rodger

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Seven horses with headshaking are described. No physical abnormalities were detected in any of the cases. Six of these horses had onset of clinical signs in the spring. The role of light was assessed by application of a blindfold or dark grey lens to the eyes, covering the eyes with a face mask and observing the horse in total darkness outdoors. Cessation of headshaking was observed with blindfolding (5/5 horses), night darkness outdoors (4/4 horses) and use of grey lenses (2/3 horses). Outdoor behaviour suggested efforts to avoid light in 4/4 cases. The photic sneeze in man is suggested as a putative mechanism for equine headshaking. Five of 7 horses had improvement with cyproheptadine treatment (0.3 mg/kg bwt b.i.d.). Headshaking developed within 2 calendar weeks of the same date for 3 consecutive years in one horse. Neuropharmacological alterations associated with photoperiod mechanisms leading to optic trigeminal summation are suggested as possible reasons for spring onset of headshaking.

Original languageEnglish (US)
Pages (from-to)306-311
Number of pages6
JournalEquine Veterinary Journal
Volume27
Issue number4
StatePublished - Jul 1995

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Horses
horses
Darkness
Lens
eyes
cyproheptadine
Cyproheptadine
Light
Crystalline Lens
Photoperiod
Masks
optics
Lenses
photoperiod

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Photic headshaking in the horse : 7 cases. / Madigan, John E; Kortz, G.; Murphy, Christopher J; Rodger, L.

In: Equine Veterinary Journal, Vol. 27, No. 4, 07.1995, p. 306-311.

Research output: Contribution to journalArticle

Madigan, JE, Kortz, G, Murphy, CJ & Rodger, L 1995, 'Photic headshaking in the horse: 7 cases.', Equine Veterinary Journal, vol. 27, no. 4, pp. 306-311.
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