What question did this study set out to answer?

This research aims to investigate the dependence of pupil size fluctuations on respiratory cycles and their neural pathways.

April 1, 1975American Journal of Physiology-Legacy Content

Respiratory fluctuations in pupil size

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Population

Cats (lightly anesthetized or tranquilized)

Comparison

Investigation of properties, nervous pathways… vs Alert or deeply anesthetized cats

Design

Preclinical

Authors

PBP. BorgdorffAmsterdam UMC Location Vrije Universiteit Amsterdam

Discussion

Member takes

Implication

Should not yet change clinical pupil assessment; leaves open translation of feline parasympathetic-respiratory coupling to human autonomic research.

Key Points

This research aims to investigate the dependence of pupil size fluctuations on respiratory cycles and their neural pathways.
Measured pupil size fluctuations in lightly anesthetized cats under control conditions.
Explored the relationship between pupil movements and respiratory cycles, including testing with electrical stimulation.
Reviewed existing literature on respiratory oscillations in various organisms.
Pupil movements were rhythmically synchronized with the central respiratory cycle and ventilatory cycle.
Fluctuations were found to be independent of sympathetic innervation, reliant on parasympathetic outflow.
Electrical stimulation of the lung vagi influenced pupil width, indicating a potential neural pathway.

Structured PICO

Population

Cats (lightly anesthetized or tranquilized)

Intervention

Investigation of properties, nervous pathways, and origin of pupil oscillations (including electrical stimulation of afferent lung vagi)

Comparator

Alert or deeply anesthetized cats (ether, halothane, or pentobarbital)

Outcome

Pupil size fluctuations and their relationship to the respiratory cycle, blood pressure, and nervous pathwayssurrogate

Respiratory fluctuations in pupil size in cats are driven by central respiratory activity and baroreceptor-mediated blood pressure changes affecting parasympathetic outflow.

Cite This Study

P. Borgdorff (1975) studied this question.

synapsesocial.com/papers/69d56c5975589c71d767cdb7 https://doi.org/10.1152/ajplegacy.1975.228.4.1094

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Implication

Should not yet change clinical pupil assessment; leaves open translation of feline parasympathetic-respiratory coupling to human autonomic research.