Reference : Cardiovascular response to exogenous serotonin in healthy calves
Scientific journals : Article
Life sciences : Veterinary medicine & animal health
Cardiovascular response to exogenous serotonin in healthy calves
Linden, Annick mailto [Université de Liège - ULiège > Département des maladies infectieuses et parasitaires > Santé et pathologies de la faune sauvage >]
Desmecht, Daniel mailto [Université de Liège - ULiège > Département de morphologie et pathologie > Pathologie spéciale et autopsies >]
Amory, Hélène mailto [Université de Liège - ULiège > Département clinique des animaux de compagnie et des équidés > Médecine interne des équidés >]
Beduin, Jean-Marie mailto [Université de Liège - ULiège > Services généraux (Faculté de médecine vétérinaire) > Scientifiques attachés au Doyen (F MV) >]
Lekeux, Pierre mailto [Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie >]
American Journal of Veterinary Research
American Veterinary Medical Association
Yes (verified by ORBi)
[en] serotonin ; 5-hydroxytryptamine ; lung
[en] OBJECTIVE: To characterize the cardiovascular response to i.v. administration of serotonin (5-hydroxytryptamine [5-HT]) in calves.

ANIMALS: 5 healthy unsedated Friesian calves.

PROCEDURE: 41 5-HT administrations were performed: II slow infusions (duration, 5 minutes) and 30 bolus infusions (duration, 5 seconds). Cardiovascular function values were recorded before, during, and after the infusion.

RESULTS: Slow infusion of 5HT first resulted in a brief period of severe bradycardia, then in sustained tachycardia with a concomitant increase in cardiac output. Systemic initial hypotension concomitant with bradycardia, then a pressor phase associated with an increase in systemic vascular resistance, and finally, a long-lasting hypotensive phase associated with decreased systemic vascular resistance. Pulmonary hypertension was associated with increased pulmonary vascular resistance, reflecting intense pulmonary vasoconstriction. Bolus infusion at increasing dosages resulted in dose-dependent bradycardia and systemic hypotension, followed by dose-dependent systemic hypertension. Unlike with slow infusion, neither the second tachycardiac nor the third systemic hypotensive phases were evident.

CONCLUSIONS: 5-HT induces dose-dependent cardiovascular responses, including a reflex response followed by pulmonary and systemic vasoconstriction, in healthy calves.

CLINICAL RELEVANCE: Determining the type of serotonergic receptors responsible for these responses may help to determine whether 5-HT is involved in the mechanisms underlying brisket disease in cattle.

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