Cardiorespiratory parameters and respiratory reflexes in rabbits during hyperthermia

Title:

Cardiorespiratory parameters and respiratory reflexes in rabbits during hyperthermia

Creator:

Javorka, K., Čalkovská, A., Petrášková, M., and Gecelovská, V.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:7b49a9ef-f65d-4746-bc7e-fc9ccf90f9e1
uuid:7b49a9ef-f65d-4746-bc7e-fc9ccf90f9e1

Subject:

hering-Breuer inflation reflex, defensive airways reflexes, hyperthermia, thermal polypnoea, panting, and SIDS

Type:

article, model:article, and TEXT

Description:

The effects of different body temperature (BT) on the respiratory and cardiovascular parameters and respiratory reflexes were studied in 33 anaesthetized adult rabbits. Hyperthermia elicited panting with mean panting respiratory rate 199±14 x min“1 in all anaesthetized rabbits. Significant correlations between BT and frequency of breathing (positive), heart rale (positive) or tidal volume (negative) were found. Cooling was accompanied by considerable arterial hypotension. Duration of the Hering-Breuer reflex (HB) was reduced by the rise of BT. Intensity of the reflex (assessed as the ratio of the apnoeic pause to the mean duration of the previous 5 breaths) was unchanged up to the body temperature eliciting panting (41.15±0.08 °C) when it was greatly diminished. Defensive airway reflexes were also changed in hyperthermia. The duration as well as the intensity of nasal apnoca (Kratschmer’s reflex) and laryngeal chemoreflex apnoea were decreased. The intensities of respiratory efforts in sneezing and laryngeal coughing were reduced. The expulsive reactions evoked by mechanical stimulation of the larynx were replaced by very shortlasting inhibition of breathing during panting. The results indicate that reflex control of breathing via the Hering-Breuer reflex and the ability to eliminate irritants from the airways are diminished during hyperthermia and panting in anaesthetized rabbits.

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Physiological research | 1996 Volume:45 | Number:6

Harvested from:

CDK

Metadata only:

false