5-Hydroxytryptamine mediates the post-embolic increase in respiratory rate in anaesthetized rabbits.

Abstract:

:The effect of the neuronal 5-HT3 receptor antagonist MDL 72222 has been investigated on the reflex tachypnoeic response to pulmonary embolism in pentobarbitone-anaesthetized rabbits. Pre-treatment with MDL 72222 (640 micrograms kg-1, 5 min prior to embolization) significantly attenuated the reflex tachypnoeic response associated with the injection of emboli. MDL 72222 had no effect on the bradycardia associated with embolization; however, it significantly reduced the decrease in arterial blood pressure and converted the decrease in tidal volume seen in pulmonary embolism to an increase. Furthermore, MDL 72222 had no effect on the decrease in circulating platelet count associated with embolization. The data suggest that 5-hydroxytryptamine is of primary importance in mediating the post-embolic increase in respiratory rate seen in this model of pulmonary embolism.

journal_name

Exp Physiol

journal_title

Experimental physiology

authors

Armstrong DJ,Kay IS

doi

10.1113/expphysiol.1990.sp003424

subject

Has Abstract

pub_date

1990-07-01 00:00:00

pages

475-81

issue

4

eissn

0958-0670

issn

1469-445X

journal_volume

75

pub_type

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