Baroreflex and atrial natriuretic factor concentration correlate with myocardial infarct size and predict early death in rabbits: implications for drug studies

Détails

ID Serval
serval:BIB_BD8AC35FF1A2
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Baroreflex and atrial natriuretic factor concentration correlate with myocardial infarct size and predict early death in rabbits: implications for drug studies
Périodique
Journal of Cardiovascular Pharmacology
Auteur(s)
Hof  R. P., Takiguchi  Y., Nussberger  J., Hof  A., Klay  M., Peters  T., Zelis  R., Brunner  H. R.
ISSN
0160-2446 (Print)
Statut éditorial
Publié
Date de publication
09/1991
Volume
18
Numéro
3
Pages
361-8
Notes
Journal Article --- Old month value: Sep
Résumé
The severity of myocardial infarction (MI) and its functional consequences are difficult to assess in small animals. We searched for criteria to achieve such an assessment in rabbits 1 week after MI. Thirteen large mongrel rabbits (3-4 kg) were anesthetized with pentobarbitone for ligating a branch of the circumflex coronary artery and 7 rabbits were subject to a sham operation without ligation. All sham-operated rabbits and 12 MI animals survived for 1 week, when blood was obtained for biochemical analyses and the baroreflex was tested. Six animals survived to the third week (survivors) and six died earlier (nonsurvivors). The MI size, measured immediately after death, was 42 +/- 3% of the left ventricular mass in nonsurvivors and 20 +/- 7% in survivors. The plasma atrial natriuretic factor (ANF) concentration was correlated linearly with MI size (r = 0.77) over the whole range of infarct sizes and, like the MI size itself, was associated with the risk of early death (critical limit: 80 pM). Plasma renin activity and catecholamines yielded less prognostic information. The baroreflex control of the heart rate (tested using phenylephrine and nitroprusside) of nonsurvivors was severely impaired and the slopes correlated with MI size (r = 0.90 for phenylephrine and r = 0.67 for nitroprusside). The plasma ANF concentration and the baroreflex both accurately reflected MI size and also correctly classified 11/12 rabbits into survivors and nonsurvivors. An ANF- and baroreflex-based stratification of animals for future studies on therapeutic interventions after MI will reduce the number of animals required by at least 65%, making such studies far more feasible than in the past.
Mots-clé
Animals Atrial Natriuretic Factor/*metabolism Blood Pressure/drug effects Coronary Vessels/physiology Female Heart Rate/drug effects Male Myocardial Infarction/*pathology Nitroprusside/diagnostic use Norepinephrine/blood Phenylephrine/diagnostic use Pressoreceptors/*drug effects Rabbits Radioimmunoassay Reflex/*drug effects Renin/blood
Pubmed
Web of science
Création de la notice
05/03/2008 17:40
Dernière modification de la notice
03/03/2018 20:58
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