Fukuda, N and Itatani, K and Kimura, K and Ebihara, A and Negishi, K and Uno, K and Miyaji, K and Kurabayashi, M and Takenaka, K, Prolonged vortex formation during the ejection period in the left ventricle with low ejection fraction: a study by vector flow mapping, Journal of Medical Ultrasonics, 41, (3) pp. 301-310. ISSN 1346-4523 (2014) [Refereed Article]
Copyright 2014 The Japan Society of Ultrasonics in Medicine
Purpose: Vortex formation in the left ventricle (LV) can be visualized by novel vector flow mapping (VFM) based on color Doppler and speckle tracking data. The aim of this study was to evaluate the impact of a vortex during the ejection period using VFM.
Subjects and methods: Color Doppler images were obtained to produce VFM images in 80 subjects (20 normal, 29 with dilated cardiomyopathy, and 31 with old myocardial infarction). The duration of the LV vortex was measured and expressed as the ratio to the ejection time (VTRe).
Results: The VTRe showed significant correlations with EDV (ρ = 0.672, p < 0.001), ESV (ρ = 0.772, p < 0.001), EF (ρ = −0.783, p < 0.001), left atrium diameter (LAd) (ρ = 0.302, p = 0.007), stroke volume (ρ = −0.600, p < 0.001), e′ (ρ = −0.389, p < 0.001), a′ (ρ = −0.314, p = 0.005), s′ (ρ = −0.512, p < 0.001), and E/e′ (ρ = 0.330, p = 0.003). The diastolic parameters (e′, a′, E/e′, LAd) were not correlated when they were adjusted by EF.
Conclusions: In the normal LV, a vortex existed for only a limited time during the early ejection period. In contrast, the lower the EF was, the longer the vortex remained during systole. Evaluation of vortices by VFM may noninvasively provide novel insights into the pathophysiology of impaired cardiac function.
|Item Type:||Refereed Article|
|Keywords:||vortex, VFM (vector flow mapping), color doppler, speckle tracking, impaired cardiac function|
|Research Division:||Biomedical and Clinical Sciences|
|Research Group:||Cardiovascular medicine and haematology|
|Research Field:||Cardiology (incl. cardiovascular diseases)|
|Objective Group:||Clinical health|
|Objective Field:||Clinical health not elsewhere classified|
|UTAS Author:||Negishi, K (Dr Kazuaki Negishi)|
|Web of Science® Times Cited:||12|
|Deposited By:||Menzies Institute for Medical Research|
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