| Depressed contractile state and increased myocardial consumption for non-mechanical work in patients with heart failure due to old myocardial infarction. | |
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MedLine Citation:
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PMID: 7954629 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: The aim was to characterise the impaired myocardial mechanoenergetics in patients with heart failure due to old myocardial infarction by using the oxygen consumption versus left ventricular pressure--volume area (PVA) relationship. METHODS: The VO2-PVA relationship was assessed in 15 patients: group N consisted of seven patients with vasospastic angina pectoris whose left ventricular ejection fractions were normal [72 (SD 8)%], and group F consisted of eight patients with old myocardial infarction whose left ventricular ejection fractions were reduced [45(11)%]. Left ventricular volume and pressure were measured by the conductance catheter method. VO2 was measured by thermodilution. RESULTS: Linear VO2-PVA relationships with dextran infusions were obtained in both groups (median r = 0.92 v 0.90). There was no difference in the slope between the two groups. There was a positive correlation between Emax and VO2 at median PVA (VO2,PVA0.8) in group N. Emax, an index of left ventricular contractility, was significantly smaller in group F than in group N, at 5.1(2.1) v 3.2(1.1) mm Hg.ml-1.m2; p < 0.05). On the other hand, the VO2 intercept in group F was comparable to that in group N, at 0.71(0.63) v 0.40(0.29) J x beat-1.100 g LV-1; NS). In addition, the ratio of VO2,PVA0.8 to Emax was significantly larger in group F than in group N: 0.55(0.14) v 0.89(0.37) J x beat-1.100 g LV-1.mm Hg-1.ml.m-2 (p < 0.05). CONCLUSIONS: These results suggest that the VO2 for non-mechanical work in group F is disproportionately high relative to the reduced contractility. An abnormality of excitation-contraction coupling rather than of crossbridge cycling may be responsible for the impaired mechanoenergetics in patients with heart failure due to old myocardial infarction. |
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Authors:
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H Takaoka; M Takeuchi; M Odake; K Hata; Y Hayashi; M Mori; M Yokoyama |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Cardiovascular research Volume: 28 ISSN: 0008-6363 ISO Abbreviation: Cardiovasc. Res. Publication Date: 1994 Aug |
Date Detail:
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Created Date: 1994-12-21 Completed Date: 1994-12-21 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0077427 Medline TA: Cardiovasc Res Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 1251-7 Citation Subset: IM |
Affiliation:
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1st Department of Medicine, Kobe University School of Medicine, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Female Heart / physiopathology* Heart Failure / etiology, metabolism, physiopathology* Humans Male Middle Aged Myocardial Contraction / physiology* Myocardial Infarction / complications*, metabolism, physiopathology Myocardium / metabolism Oxygen Consumption / physiology* Ventricular Pressure / physiology |
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