Haemodynamic effects of the intravenous administration of growth hormone in anaesthetized pigs

Administration of growth hormone in humans has been reported variably to affect arterial blood pressure and ventricular contractility. The present study was undertaken in anaesthetized pigs to establish whether increases in the blood levels of growth hormone primarily affect haemodynamic variables a...

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Bibliographic Details
Published in:Pflügers Archiv 1998-07, Vol.436 (2), p.159-167
Main Authors: Vacca, G, Battaglia, A, Chiorboli, E, Grossini, E, Mary, D A, Molinari, C, Bona, G
Format: Article
Language:English
Subjects:
Adjuvants, Anesthesia
Adrenergic beta-Antagonists - pharmacology
Anesthesia
Animals
Aorta - physiology
Blood Pressure
Butoxamine - pharmacology
Coronary Circulation
Growth hormones
Heart Rate
Hemodynamics
Human Growth Hormone - administration & dosage
Human Growth Hormone - blood
Human Growth Hormone - pharmacology
Humans
Kinetics
Pentobarbital
Propranolol - pharmacology
Receptors, Adrenergic, beta - physiology
Swine
Vasoconstriction
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Summary:Administration of growth hormone in humans has been reported variably to affect arterial blood pressure and ventricular contractility. The present study was undertaken in anaesthetized pigs to establish whether increases in the blood levels of growth hormone primarily affect haemodynamic variables and to determine the mechanisms involved. In pigs anaesthetized with pentobarbitone sodium, left circumflex or anterior descending coronary blood flow was measured with an electromagnetic flowmeter. In a first group of 23 pigs, growth hormone administration (0.05 IU kg-1 i.v.) increased aortic blood pressure and reduced coronary blood flow when heart rate and aortic blood pressure were held constant. These responses were augmented by graded increases in plasma levels of growth hormone. The mechanisms of the above responses were studied in a second group of 29 pigs and involved beta2-adrenergic receptors since they were abolished by propranolol or butoxamine but not by atropine, phentolamine or atenolol. The present study showed that administration of growth hormone in anaesthetized pigs primarily increased aortic blood pressure and vasoconstricted the coronary circulation. The mechanisms of these responses involved beta2-adrenoceptor effects.
ISSN:0031-6768
1432-2013
DOI:10.1007/s004240050618