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Titolo:
NOREPINEPHRINE-INDUCED LEFT-VENTRICULAR DYSFUNCTION IN ANESTHETIZED AND CONSCIOUS, SEDATED DOGS
Autore:
MOVAHED A; REEVES WC; MEHTA PM; GILLILAND MGF; MOZINGO SL; JOLLY SR;
Indirizzi:
E CAROLINA UNIV,SCH MED,DEPT INTERNAL MED,CARDIOL SECT,4S-22 BRODY GREENVILLE NC 27834
Titolo Testata:
International journal of cardiology
fascicolo: 1, volume: 45, anno: 1994,
pagine: 23 - 33
SICI:
0167-5273(1994)45:1<23:NLDIAA>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
WALL STRESS; CARDIOTOXICITY;
Keywords:
NOREPINEPHRINE; CATECHOLAMINE CARDIOTOXICITY; DOG; VENTRICULAR WALL STRESS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
A. Movahed et al., "NOREPINEPHRINE-INDUCED LEFT-VENTRICULAR DYSFUNCTION IN ANESTHETIZED AND CONSCIOUS, SEDATED DOGS", International journal of cardiology, 45(1), 1994, pp. 23-33

Abstract

These studies were conducted to evaluate effects of high dose norepinephrine infusion on left ventricular function in anesthetized and conscious dogs. Separate groups of pentobarbital anesthetized closed-chestdogs received norepinephrine infusion for 90 min followed by 1 h of recovery. Arterial pressure, electrocardiogram, two-dimensional echocardiogram and an equilibrium radionuclide angiogram were monitored. One hour following infusion of norepinephrine, left ventricular ejection fraction was reduced in a dose-dependent fashion. Fractional shorteningwas similarly reduced, with increased left ventricular systolic and diastolic dimensions also observed. Left ventricular end-systolic wall stress was increased at 60 min following infusion of norepinephrine but not saline: saline, 68 +/- 8, norepinephrine, 4 mu g/kg/min, 113 +/-8 g/cm(2). The left ventricular end-systolic wall stress/fractional shortening relationship showed reduction of contractility. In 10 conscious dogs pretreated with morphine, norepinephrine at 5 mu g/kg/min x 90 min produced similar changes to those seen in anesthetized animals. Ejection fraction was reduced from 0.69 +/- 0.3 to 0.36 +/- 0.04 at 60min post infusion. Fractional shortening was also reduced. Left ventricular end-diastolic dimension was increased. However, when animals were followed for 1 week, complete recovery occurred within 48 h. Histology showed mild contraction band necrosis in acute experiments and mild perivascular fibrosis in chronic experiments. Therefore, norepinephrine cardiotoxicity produced significant left ventricular dilation and reduction of ejection phase indices of left ventricular function associated with reduced contractility. In chronic dogs, histologic changes were mild, and left ventricular dysfunction was reversible.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 22:51:31