| Haemodynamic effects on the myocardial blood flow supply/oxygen demand ratio in pacing induced angina pectoris. | |
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MedLine Citation:
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PMID: 698987 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Angina pectoris results from an imbalance between oxygen supply and demand in the subendocardium. The haemodynamic effects contributing to this imbalance have been studied in 10 patients with coronary artery disease. Myocardial oxygen demand was estimated from the tension time index (TTI), potential subendocardial flow from a diastolic pressure time index (DPTI), and the oxygen supply/demand ratio from (DPTI/TTI. With progressively increasing pacing rates up until induction of angina, no significant change in TTI was found whereas a significant fall in DPTI and DPTI/TTI occurred (P less than 0.001). During pacing runs with induction of angina DPTI/TTI reached a minimum value 5 s before,and at the onset of angina. No such relationship was seen for TTI or DPTI alone. A significant rise in LVEDP (P less than 0.05) and fall in dP/dt min (P less than 0.01) occurred at angina both contributing to a further reduction in DPTI and DPTI/TTI. Changes in DPTI/TTI may then reflect changes in the myocardial blood flow supply/oxygen demand ratio in the presence of coronary artery disease and haemodynamic changes before and at the induction of angina lead to a further reduction of this ratio. |
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Authors:
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D C Russell; R Balcon |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Cardiovascular research Volume: 12 ISSN: 0008-6363 ISO Abbreviation: Cardiovasc. Res. Publication Date: 1978 Jun |
Date Detail:
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Created Date: 1978-12-29 Completed Date: 1978-12-29 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: 358-63 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Angina Pectoris
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etiology,
metabolism,
physiopathology* Cardiac Pacing, Artificial / adverse effects Coronary Circulation Hemodynamics* Humans Oxygen Consumption |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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