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Cardiovascular Research 1995 30(5):689-696; doi:10.1016/S0008-6363(95)00076-3
© 1995 by European Society of Cardiology
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Copyright © 1995, European Society of Cardiology

Increased resistance to ischaemic injury in the isolated perfused atherosclerotic heart of the cholesterol-fed rabbit

Bruno Le Granda, Bruno Viéa, Philippe Fauréb, Anne-Dominique Degryseb, Pierre Mouillard and Gareth W. John*

aCentre de Recherche Pierre Fabre, Division of Cardiovascular Diseases, 17, Ave. Jean Moulin, 81100 Castres, France
bCentre d'Anatomie et de Cytologie Pathologiques, 47 rue Théron Périé, 81100 Castres, France

* Corresponding author. Tel.: (+ 33-63) 71 42 04; fax: (+ 33-63) 71 42 99.

Objective: In isolated, Langendorff-perfused hearts in the early stages of atherosclerosis from rabbits exposed to hypercholesterolaemia induced by 2% cholesterol feeding for 6 weeks (n = 23), and age-matched normal controls fed standard chow (n = 12), we studied baseline cardiac haemodynamics and the susceptibility of these hearts to 30 min global, normothermic ischaemia and 90 min reperfusion. Methods: Spontaneously beating hearts were perfused with oxygenated Krebs buffer (pH 7.4) at constant pressure, and were enclosed in a thermostated water jacket at 37 °C. Isovolumetric left ventricular (LV) pressure was measured by means of a balloon placed in the LV cavity. An electromagnetic flow probe placed around the perfusion cannula determined coronary flow. At the end of an initial 30 min stabilisation period, several baseline cardiodynamic variables were measured, just before subjecting the hearts to 30 min ischaemia. Recovery of mechanical function and lactate dehydrogenase (LDH) and creatine phosphokinase (CPK) activities in the coronary effluent were recorded throughout 90 min reperfusion. Results: Baseline spontaneous heart rate, LV developed pressure (LVDP), coronary flow and pressure-rate index (PRI) were all significantly lower in hearts from cholesterol-fed rabbits (CFR) than in age-matched controls (P < 0.01). Although large differences in several baseline haemodynamic parameters in hearts from CFR and controls were evident before ischaemia, no statistically significant differences were discernible in these parameters between the two groups from 60 min reperfusion onwards (p = NS). Furthermore, CPK and, to a lesser extent, LDH release during reperfusion was attenuated in hearts from CFR compared to controls. Conclusions: Hearts from CFR exhibited markedly improved recovery upon reperfusion compared to age-matched controls, strongly suggesting increased myocardial resistance to ischaemic injury.

KEYWORDS Hypercholesterolemia; Atherosclerosis; Myocardial ischemia; Myocardial function; Rabbit, heart


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 Cardiovasc ResHome page
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Cardiovasc Res, February 15, 2004; 61(3): 512 - 521.
[Abstract] [Full Text] [PDF]


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