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Prolonged vortex formation during the ejection period in the left ventricle with low ejection fraction: a study by vector flow mapping

Citation

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 Statement

Copyright 2014 The Japan Society of Ultrasonics in Medicine

DOI: doi:10.1007/s10396-014-0530-3

Abstract

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 Details

Item Type:Refereed Article
Keywords:vortex, VFM (vector flow mapping), color doppler, speckle tracking, impaired cardiac function
Research Division:Medical and Health Sciences
Research Group:Cardiorespiratory Medicine and Haematology
Research Field:Cardiology (incl. Cardiovascular Diseases)
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Cardiovascular System and Diseases
Author:Negishi, K (Dr Kazuaki Negishi)
ID Code:93490
Year Published:2014
Web of Science® Times Cited:5
Deposited By:Menzies Institute for Medical Research
Deposited On:2014-08-05
Last Modified:2015-07-30
Downloads:0

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