Eye examination-induced syncope

Role of trigeminal afferents

Research output: Contribution to journalArticle

Abstract

The role of trigeminal afferents in a patient with eye examination - induced syncope was investigated. A head-up tilt test precipitated presyncope with a reduced blood pressure. On a separate day, the application of Schirmer's lacrimation test strips in each conjunctival sac caused vasodepression and cardioinhibition. Topical administration of 0.5% proparacaine hydrochloride produced ocular anesthesia and loss of corneal reflexes. Schirmer's test following anesthesia again caused presyncope with reductions in blood pressure and heart rate. The supramaximal stimulus to a supraorbital nerve before and after topical anesthesia did not affect blood pressure or heart rate. It is concluded that trigeminal afferents did not induce vasodepressive syncope in this patient. Instead, corticohypothalamic centers may have played an important role.

Original languageEnglish (US)
Pages (from-to)399-403
Number of pages5
JournalClinical Autonomic Research
Volume12
Issue number5
DOIs
StatePublished - Dec 1 2002
Externally publishedYes

Fingerprint

Syncope
Anesthesia
Blood Pressure
Heart Rate
Topical Administration
Blinking
Lacrimal Apparatus
Head

Keywords

  • Situational syncope
  • Trigeminal afferents

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)

Cite this

Eye examination-induced syncope : Role of trigeminal afferents. / Khurana, Ramesh.

In: Clinical Autonomic Research, Vol. 12, No. 5, 01.12.2002, p. 399-403.

Research output: Contribution to journalArticle

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