| Phasic changes in arterial blood volume is influenced by collateral blood flow: implications for the quantification of coronary stenosis at rest. | |
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MedLine Citation:
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PMID: 17005716 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: The systolic to diastolic arteriolar blood volume (aBV) ratio derived using myocardial contrast echocardiography (MCE) can identify the presence of coronary stenosis at rest. There are some patients with moderate to severe coronary stenosis who nonetheless exhibit a normal systolic to disatolic aBV ratio. AIM: To test the hypothesis that collateral blood flow influences the systolic to diastolic aBV ratio. MCE-defined phasic changes in aBV were recorded at baseline and up to 2 degrees of non-critical stenosis in 12 dogs. Measurements were made from MCE-defined collateralised and non-collateralised portions of the left anterior descending arterial bed. RESULTS: Increases in both systolic and diastolic aBV were noted in the non-collateralised region with increasing degrees of stenosis. Although these increases in the absolute values did not reach statistical significance, the systolic to diastolic aBV signal ratio in the non-collateralised bed increased significantly between stages (analysis of variance, p = 0.003). In comparison, in the collateralised bed neither the absolute systolic nor diastolic aBV signals changed with increasing degrees of stenosis. Consequently, the aBV signal ratio between systole and diastole also did not change in this bed. CONCLUSION: Phasic changes in aBV are influenced by the degree of collateral blood flow. Thus, if the region of interest is not placed in the centre of the vascular bed, the degree of stenosis may be underestimated by the systolic to diastolic aBV ratio. On the other hand, as extensive collateralisation may indicate excellent prognosis, this ratio may provide prognostic information independent of the coronary anatomy. |
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Authors:
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Marco Pascotto; Kevin Wei; Antonio Micari; Thanjavur Bragadeesh; Norman Craig Goodman; Sanjiv Kaul |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2006-09-27 |
Journal Detail:
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Title: Heart (British Cardiac Society) Volume: 93 ISSN: 1468-201X ISO Abbreviation: Heart Publication Date: 2007 Apr |
Date Detail:
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Created Date: 2007-04-02 Completed Date: 2007-04-26 Revised Date: 2010-09-15 |
Medline Journal Info:
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Nlm Unique ID: 9602087 Medline TA: Heart Country: England |
Other Details:
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Languages: eng Pagination: 438-43 Citation Subset: AIM; IM |
Affiliation:
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Division of Cardiovascular Medicine, Oregon Health & Science University, Portland, OR 97239, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blood Flow Velocity Blood Volume / physiology Collateral Circulation / physiology* Coronary Circulation / physiology* Coronary Stenosis / diagnosis, physiopathology* Diastole / physiology Dogs Rest Systole / physiology |
| Grant Support | |
ID/Acronym/Agency:
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R01-EB-002069/EB/NIBIB NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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