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Hypercapnic ventilatory response in unanesthetized normal hamsters.

S Javaheri, E C Lucey

Bulletin Europeen De Physiopathologie Respiratoire

|March 1, 1986

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This study measured the hypercapnic ventilatory response (HCVR) in awake hamsters. Hamsters showed responses similar to cats and humans, differing from rats.

Area of Science:

Physiology
Respiratory System Research
Animal Models

Background:

Measuring hypercapnic ventilatory response (HCVR) in unanesthetized, unrestrained animals is crucial.
Existing methods may not fully capture natural physiological responses.

Purpose of the Study:

To establish a method for measuring steady-state HCVR in awake, unrestrained hamsters.
To characterize the ventilatory and breathing pattern responses to hypercapnia in this model.

Main Methods:

Utilized a barometric chamber for non-invasive ventilation measurement.
Employed chronic aortic cannulation in 16 hamsters for precise CO2 monitoring.
Measured steady-state HCVR across a Paco2 range of 53-73 mmHg.

Main Results:

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The mean HCVR in hamsters was 10.1 +/- 4.9 ml X min-1 X mmHg-1.
Increased ventilation at low CO2 was driven by inspiratory flow and tidal volume.
At higher CO2, breathing frequency increased due to reduced expiratory time, while inspiratory time initially rose then normalized.

Conclusions:

The barometric chamber method provides a reliable measure of HCVR in awake hamsters.
Hamster ventilatory responses to hypercapnia share similarities with cats and humans.
This model offers a valuable alternative for studying respiratory control mechanisms, with noted differences from rat responses.