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An experimental model of oculorespiratory reflex.

A K Khurana1, I Khurana, R N Yadav

  • 1Department of Ophthalmology, Medical College, Rohtak, Haryana, India.

The British Journal of Ophthalmology
|February 1, 1992
PubMed
Summary
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The oculorespiratory reflex (ORR) was consistently elicited in rabbits using a square wave stimulus. The medial rectus muscle was most sensitive, and the reflex was blocked by retrobular injection.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Physiology

Background:

  • The oculorespiratory reflex (ORR) is a physiological response linking eye muscle activity to respiratory changes.
  • Understanding the neural pathways and triggers of the ORR is crucial for respiratory control research.

Purpose of the Study:

  • To investigate the elicitation and characteristics of the oculorespiratory reflex (ORR) in albino rabbits.
  • To identify the most effective ocular muscle for triggering the ORR.
  • To determine the influence of specific pharmacological and surgical interventions on the ORR.

Main Methods:

  • An experimental study was performed on 20 albino rabbits.
  • A square wave (SW) stimulus was used to elicit the oculorespiratory reflex (ORR).
  • Interventions included bilateral vagotomy, intravenous atropine, intravenous glycopyrrolate, and retrobular block.

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Main Results:

  • The oculorespiratory reflex (ORR) was successfully elicited in 100% of the rabbits.
  • The medial rectus muscle was identified as the most reflexogenic component for eliciting the ORR.
  • Bilateral vagotomy and anticholinergic drugs (atropine, glycopyrrolate) did not alter the ORR frequency or pattern.
  • A retrobular block completely abolished the oculorespiratory reflex (ORR).

Conclusions:

  • The oculorespiratory reflex (ORR) is reliably inducible in rabbits via ocular muscle stimulation.
  • The medial rectus muscle plays a significant role in the ORR.
  • The ORR pathway is independent of vagal and muscarinic cholinergic pathways but relies on retrobulbar neural structures.