Takiko Aoki

Saint Mary's Hospital Center, Montréal, Quebec, Canada

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Publications (2)2.75 Total impact

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    ABSTRACT: The aim of this study was to evaluate the left ventricular (LV) diastolic function parameter calculated using three-dimensional (3D) echocardiography. Using 3D echocardiography and an analysis software program, the left ventricular volume through the cardiac cycle was measured automatically. We therefore calculated 25%, 50%, and 75% of the subtraction end-systolic volume (ESV) from the end-diastolic volume (EDV). The period that the left ventricular volume reached those volumes was calculated from the ESV. Those periods divided all diastolic periods and those calculated values were named D1/4, D1/2, and D3/4, respectively. The peak-filling rate and 1/3 filling fraction (FF) were calculated. E/A, mitral annulus velocities (E'), E/E', ejection fraction (EF), and left ventricular end-diastolic pressure (LVEDP) were also measured. E/A significantly correlated with D3/4. E/E'significantly correlated with the D1/4, D1/2, and 1/3 filling fraction. E'had a significantly negative correlation with the D1/4, D1/2, D3/4, and 1/3 FF. DT significantly correlated with D1/4, D1/2, D3/4, 1/3 FF, and the mean filling rate and it had a significant negative correlation with the 1/3 filling fraction. EF showed a significant positive correlation with the peak filling ratio. LVEDP demonstrated a significant correlation with D1/4 and D1/2. This study suggests that the LV diastolic indexes as determined by 3D echocardiography provide useful information in the clinical assessment of the diastolic LV function.
    Echocardiography 10/2008; 25(9):968-73. DOI:10.1111/j.1540-8175.2008.00716.x · 1.25 Impact Factor
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    ABSTRACT: Inflammatory cytokines play an important role in mediating inflammatory/proliferative responses including atherosclerosis. However, their role in the pathogenesis of restenosis after percutaneous transluminal coronary angioplasty (PTCA) remains to be clarified. To determine plasma levels of inflammatory cytokines as well as cytokine-generation capacities of monocytes before PTCA and after the follow-up period. Plasma levels of cytokines in 34 consecutive patients before and 3-6 months after PTCA were measured by enzyme-linked immunosorbent assay. We measured the plasma levels of macrophage-colony-stimulating factor (MCSF) and transforming growth factor-beta. Cytokine-generation capacities of monocytes were also measured by a whole-blood induction method with lipopolysaccharide. The levels of cytokines measured for assessment of the capacities included those of interleukin-1alpha, interleukin-1beta, interleukin-6, granulocyte-colony-stimulating factor, tumor necrosis factor-alpha and interferon-gamma. Plasma levels of MCSF in patients without restenosis (n = 20) decreased significantly (from 1460+/-138 microg/ml before PTCA to 1039+/-125 microg/ml after the follow-up period, P < 0.01), whereas those in patients with restenosis (n = 14) increased significantly (from 1107+/-105 microg/ml before PTCA to 1039+/-125 microg/ml after the follow-up period, P < 0.05). We noted a positive correlation between the increase in plasma levels of MCSF and the extent of loss of lumen by restenosis. Cytokine-generation capacities of monocytes for interleukin-1alpha and interleukin-1beta of patients with restenosis significantly increased but those of patients without restenosis did not. Furthermore, plasma levels of C-reactive protein decreased significantly only in patients without restenosis after the follow-up period. These results suggest that inflammatory changes mediated by cytokines may be involved in the pathogenesis of restenosis after PTCA.
    Coronary Artery Disease 03/2001; 12(2):107-13. DOI:10.1097/00019501-200103000-00004 · 1.50 Impact Factor