Article (Scientific journals)
Cardiovascular response to exogenous serotonin in healthy calves
Linden, Annick; Desmecht, Daniel; Amory, Hélène et al.
1996In American Journal of Veterinary Research, 57 (5), p. 731-738
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Keywords :
serotonin; 5-hydroxytryptamine; lung
Abstract :
[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.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Linden, Annick  ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires > Santé et pathologies de la faune sauvage
Desmecht, Daniel ;  Université de Liège - ULiège > Département de morphologie et pathologie > Pathologie spéciale et autopsies
Amory, Hélène ;  Université de Liège - ULiège > Département clinique des animaux de compagnie et des équidés > Médecine interne des équidés
Beduin, Jean-Marie ;  Université de Liège - ULiège > Services généraux (Faculté de médecine vétérinaire) > Scientifiques attachés au Doyen (F MV)
Lekeux, Pierre ;  Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie
Language :
English
Title :
Cardiovascular response to exogenous serotonin in healthy calves
Publication date :
May 1996
Journal title :
American Journal of Veterinary Research
ISSN :
0002-9645
eISSN :
1943-5681
Publisher :
American Veterinary Medical Association, Schaumburg, United States - Illinois
Volume :
57
Issue :
5
Pages :
731-738
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 20 January 2012

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