Abstract | OBJECTIVE: METHODS: RESULTS AND CONCLUSIONS: At baseline, significant increases were observed for LV/ body weight ratio as well as LV systolic and end-diastolic pressure in the LVH dogs (all P < 0.01 vs. the control group). In addition, LV relaxation time constant was prolonged and the chamber and myocardial stiffness constants were increased (P < 0.01) in the LVH dogs, suggesting an impairment of LV diastolic function. Administration of enalaprilat or L-158,809 improved LV stiffness constants in the LVH dogs (P < 0.05). The diastolic LV pressure-diameter relation shifted downwards in the LVH dogs whereas diastolic distensibility was not altered in the control dogs. Although the circulating angiotensin II levels were significantly decreased by enalaprilat in the LVH dogs, they did not correlate with the changes in the stiffness constants. Furthermore, the alterations of LV diastolic properties in the LVH group could not be attributed to myocardial perfusion, which was rather decreased by administration of enalaprilat and L-158,809. These results suggest that angiotensin II, particularly at the local level, is involved in the pathogenesis of diastolic dysfunction in pressure-overload LVH. The data also support the concept that ACE inhibitors and angiotensin II receptor blockers are potentially beneficial in the treatment of the hypertrophied heart.
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Authors | W Hayashida, J Donckier, H Van Mechelen, A A Charlier, H Pouleur |
Journal | Cardiovascular research
(Cardiovasc Res)
Vol. 33
Issue 1
Pg. 54-62
(Jan 1997)
ISSN: 0008-6363 [Print] England |
PMID | 9059528
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Angiotensin Receptor Antagonists
- Angiotensin-Converting Enzyme Inhibitors
- Imidazoles
- Receptors, Angiotensin
- Tetrazoles
- Angiotensin II
- L 158809
- Enalaprilat
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Topics |
- Angiotensin II
(antagonists & inhibitors)
- Angiotensin Receptor Antagonists
- Angiotensin-Converting Enzyme Inhibitors
(pharmacology)
- Animals
- Diastole
- Disease Models, Animal
- Dogs
- Enalaprilat
(pharmacology)
- Hypertension, Renal
(physiopathology)
- Hypertrophy, Left Ventricular
(physiopathology)
- Imidazoles
(pharmacology)
- Receptors, Angiotensin
(drug effects)
- Tetrazoles
(pharmacology)
- Ventricular Function, Left
(drug effects)
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