What is the clinical evidence from this study?

Study design: Other. Population: Hypoxia and hypercapnia. Intervention: Sodium pentobarbitone. Primary outcome: Aortic chemoreceptor activity.

What question did this study set out to answer?

The study aims to understand how sympathetic outflow influences aortic chemoreceptor responses during hypoxia and hypercapnia in cats.

January 1, 1988The Journal of PhysiologyOpen Access

The influence of the sympathetic outflow on aortic chemoreceptors of the cat during hypoxia and hypercapnia.

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Key result

In anaesthetized cats, sodium pentobarbitone-induced hypotension caused an initial fall in aortic chemoreceptor activity during hypoxia, likely due to reduced sympathetic outflow.

Population

Cats anaesthetized with sodium pentobarbitone

Design

Preclinical

Authors

AAAnupama AnandUniversity of Delhi APA. S. PaintalUniversity of Delhi

Discussion

Member takes

Implication

No immediate clinical implications from cat data; leaves open sympathetic modulation of aortic chemoreceptor responses in hypoxia.

Key Points

The study aims to understand how sympathetic outflow influences aortic chemoreceptor responses during hypoxia and hypercapnia in cats.
Analyzed responses of aortic chemoreceptors in anesthetized cats during normoxia, hypoxia, and hypercapnia.
Administered sodium pentobarbitone and veratridine to observe effects on chemoreceptor activity and blood pressure.
Performed ventilatory tests with various CO2 concentrations on the aortic chemoreceptors.
Sodium pentobarbitone caused unexpected initial falls in chemoreceptor activity during hypoxia, contrary to expected responses.
Ventilation with CO2 produced variable increases in chemoreceptor activity, influenced by sodium pentobarbitone injections.
Higher doses of sodium pentobarbitone showed no depressant effect on chemoreceptors, indicating initial effects were due to reduced sympathetic outflow.

Structured PICO

Population

Cats anaesthetized with sodium pentobarbitone to study aortic chemoreceptor responses during normoxia, hypoxia, and hypercapnia.

Intervention

Intravenous injection of sodium pentobarbitone (20 mg or 50-60 mg), veratridine (8-25 micrograms), mechanical hypotension (balloon in right atrium), or ventilation with 5.6-6.7% CO2

Outcome

Aortic chemoreceptor activitysurrogate

Variations in aortic chemoreceptor responses during hypoxia and hypercapnia may be partly due to variations in prevailing sympathetic activity.

Cite This Study

Anand et al. (1988) studied Hypoxia and hypercapnia. Sodium pentobarbitone was evaluated on Aortic chemoreceptor activity. In anaesthetized cats, sodium pentobarbitone-induced hypotension caused an initial fall in aortic chemoreceptor activity during hypoxia, likely due to reduced sympathetic outflow.

synapsesocial.com/papers/6a6c2a9bd1b337d10db3a105 https://doi.org/10.1113/jphysiol.1988.sp016915

View Full Paper

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The influence of the sympathetic outflow on aortic chemoreceptors of the cat during hypoxia and hypercapnia.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

The influence of the sympathetic outflow on aortic chemoreceptors of the cat during hypoxia and hypercapnia.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider