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Nobuyuki Ohte - One of the best experts on this subject based on the ideXlab platform.

  • Noninvasive Evaluation of the Inertia Force of Late Systolic Aortic Flow
    IFMBE Proceedings, 2020
    Co-Authors: Nobuyuki Ohte, Kazuaki Wakami, Motoaki Sugawara, Kiyomi Niki, Genjiro Kimura
    Abstract:

    The Inertia Force of late systolic aortic flow, which is generated by left ventricles with good contraction, may be a crucial parameter through which good left ventricular (LV) systolic function delivers its effect on LV early diastolic performance. We attempted to find noninvasive parameters of the Inertia Force using 2-dimensional ultrasound speckle tracking imaging of the left ventricle and wave intensity (WI) analysis at the right carotid artery. The LV strain along the long-axis at end-systole had significant correlations with both the LV ejection fraction (r=0.80, p

  • abstract 18465 the kinetic energy of left ventricular ejection flow during late systole produces Inertia Force of late systolic aortic flow and good left ventricular early diastolic function
    Circulation, 2016
    Co-Authors: Junki Yamamoto, Kazuaki Wakami, Toshihiko Goto, Hiroshi Fujita, Syunsuke Murai, Shohei Kikuchi, Tomonori Sugiura, Nobuyuki Ohte
    Abstract:

    Background: Inertia Force of late systolic aortic flow (IF), which plays a substantial role for the coupling between left ventricular (LV) contraction and relaxation, may depend on the kinetic energy of ejecting flow (KE) during late systole (KE-LS). Good LV contraction generated much greater KE during early systole (KE-ES) and the KE-ES should affect the KE-LS. We investigated whether the KE-ES and -LS obtained using Vector Flow Mapping (VFMTM, Hitachi-Aloka) had any relationships with both IF and LV relaxation parameters invasively obtained. Method: Study subjects were 30 patients who underwent diagnostic cardiac catheterization and echocardiography on the same day. Conventional color Doppler images were acquired in the apical 3-chamber view. KE was obtained using the commercially available software (Hitachi-Aloka) (Figure). We divided the LV ejection time into 3 equal phases, then the KE was computed as a sum of KE values frame by frame basis around ES and LS; The ES was defined as the first one-third ...

  • abstract 15137 vector flow mapping is a novel useful technique in assessing Inertia Force of late systolic aortic flow and left ventricular early diastolic function
    Circulation, 2014
    Co-Authors: Kazuaki Wakami, Toshihiko Goto, Hiroshi Fujita, Tomomitsu Tani, Kenta Hachiya, Syunsuke Murai, Hidekatsu Fukuta, Nobuyuki Ohte
    Abstract:

    Background: We previously reported that the Inertia Force (IF) of blood flowing out of left ventricle (LV) during late-systole produces greater LV elastic recoil Force and brings faster LV relaxation. Vector flow mapping (VFMTM, Hitachi-Aloka) enables us to see blood flow velocity vectors that are generated from conventional color Doppler imaging data at any phase of cardiac cycle without angle dependency. Using VFM, kinetic energy (KE) of ejecting blood flow during systole at the LV outflow tract (LVOT) can be obtained. Thus, we investigated whether the KE obtained at the LVOT during late systole (KE-ls) had any relations with the IF and invasively obtained LV function parameters. Method: Study subjects were 33 patients who underwent diagnostic cardiac catheterization and echocardiographic examination on the same day. Color Doppler images were acquired in the apical 3-chamber view. The frame rate ranged was from 40 to 51 frames per minute. Data analyses were performed offline using the commercially avail...

  • abstract 12333 do the patients with Inertia Force of late systolic aortic flow have less incidence of heart failure
    Circulation, 2013
    Co-Authors: Toshihiko Goto, Kazuaki Wakami, Takafumi Kato, Hachiya Kenta, Hiroshi Fujita, Tomomitsu Tani, Nobuyuki Ohte
    Abstract:

    Inertia Force of late systolic aortic flow (IF) is observed in the left ventricles (LV) with good systolic function. A lack of IF provokes isolated LV diastolic dysfunction and may be related to th...

  • abstract 4734 echodynamography is a novel useful technique in assessing Inertia Force of late systolic aortic flow and left ventricular early diastolic function
    Circulation, 2008
    Co-Authors: Kazuaki Wakami, Nobuyuki Ohte, Kaoru Asada, Toshihiko Goto, Hidekatsu Fukuta, Chika Kato, Seiji Mukai, Syogo Suzuki, Genjiro Kimura
    Abstract:

    We previously reported that the Inertia Force (IF) of the blood flowing out of left ventricle (LV) during late systolic phase produces greater LV elastic recoil Force and brings faster LV relaxation. Echodynamography (ALOKA) is a novel technique that enables us to obtain the flow velocity vector from conventional color Doppler velocity data on the range of interest at any phase of cardiac cycle without angle dependency. We investigated whether the flow velocity vector obtained at LV outflow tract (LVOT) in late systole had a relation with IF and invasively obtained LV relaxation parameters. Method: Study subjects were consecutive 26 patients who underwent diagnostic cardiac catheterization and conventional color Doppler imaging on the same day. Color Doppler image was acquired in the apical 3-chamber view. The analyses for flow velocity vector were performed offline using an echo image analyzer. The late systolic velocity of the blood flowing was obtained as an average value of the L VOT (V LVOT −late systole). LV pressure was obtained using a catheter-tipped micromanometer. From the recorded pressure waves, first derivative of LV pressure (dP/dt) and a time constant τ of LV pressure decay during isovolumic relaxation were calculated. From LV pressure-dP/dt relationships (phase loop), IF was determined. Results: A significant positive correlation was observed between the V LVOT -late systole and IF (r=0.75, p LVOT -late systole also had significant correlations both with peak negative dP/dt (r=0.49, p Conclusion: This study indicates that the V LVOT -late systole, which may be a noninvasive substitute for IF, has significant correlations with the parameters of LV relaxation. Echodynamography is a new useful technique to estimate LV early diastolic function.

Kazuaki Wakami - One of the best experts on this subject based on the ideXlab platform.

  • Noninvasive Evaluation of the Inertia Force of Late Systolic Aortic Flow
    IFMBE Proceedings, 2020
    Co-Authors: Nobuyuki Ohte, Kazuaki Wakami, Motoaki Sugawara, Kiyomi Niki, Genjiro Kimura
    Abstract:

    The Inertia Force of late systolic aortic flow, which is generated by left ventricles with good contraction, may be a crucial parameter through which good left ventricular (LV) systolic function delivers its effect on LV early diastolic performance. We attempted to find noninvasive parameters of the Inertia Force using 2-dimensional ultrasound speckle tracking imaging of the left ventricle and wave intensity (WI) analysis at the right carotid artery. The LV strain along the long-axis at end-systole had significant correlations with both the LV ejection fraction (r=0.80, p

  • abstract 18465 the kinetic energy of left ventricular ejection flow during late systole produces Inertia Force of late systolic aortic flow and good left ventricular early diastolic function
    Circulation, 2016
    Co-Authors: Junki Yamamoto, Kazuaki Wakami, Toshihiko Goto, Hiroshi Fujita, Syunsuke Murai, Shohei Kikuchi, Tomonori Sugiura, Nobuyuki Ohte
    Abstract:

    Background: Inertia Force of late systolic aortic flow (IF), which plays a substantial role for the coupling between left ventricular (LV) contraction and relaxation, may depend on the kinetic energy of ejecting flow (KE) during late systole (KE-LS). Good LV contraction generated much greater KE during early systole (KE-ES) and the KE-ES should affect the KE-LS. We investigated whether the KE-ES and -LS obtained using Vector Flow Mapping (VFMTM, Hitachi-Aloka) had any relationships with both IF and LV relaxation parameters invasively obtained. Method: Study subjects were 30 patients who underwent diagnostic cardiac catheterization and echocardiography on the same day. Conventional color Doppler images were acquired in the apical 3-chamber view. KE was obtained using the commercially available software (Hitachi-Aloka) (Figure). We divided the LV ejection time into 3 equal phases, then the KE was computed as a sum of KE values frame by frame basis around ES and LS; The ES was defined as the first one-third ...

  • abstract 15137 vector flow mapping is a novel useful technique in assessing Inertia Force of late systolic aortic flow and left ventricular early diastolic function
    Circulation, 2014
    Co-Authors: Kazuaki Wakami, Toshihiko Goto, Hiroshi Fujita, Tomomitsu Tani, Kenta Hachiya, Syunsuke Murai, Hidekatsu Fukuta, Nobuyuki Ohte
    Abstract:

    Background: We previously reported that the Inertia Force (IF) of blood flowing out of left ventricle (LV) during late-systole produces greater LV elastic recoil Force and brings faster LV relaxation. Vector flow mapping (VFMTM, Hitachi-Aloka) enables us to see blood flow velocity vectors that are generated from conventional color Doppler imaging data at any phase of cardiac cycle without angle dependency. Using VFM, kinetic energy (KE) of ejecting blood flow during systole at the LV outflow tract (LVOT) can be obtained. Thus, we investigated whether the KE obtained at the LVOT during late systole (KE-ls) had any relations with the IF and invasively obtained LV function parameters. Method: Study subjects were 33 patients who underwent diagnostic cardiac catheterization and echocardiographic examination on the same day. Color Doppler images were acquired in the apical 3-chamber view. The frame rate ranged was from 40 to 51 frames per minute. Data analyses were performed offline using the commercially avail...

  • abstract 12333 do the patients with Inertia Force of late systolic aortic flow have less incidence of heart failure
    Circulation, 2013
    Co-Authors: Toshihiko Goto, Kazuaki Wakami, Takafumi Kato, Hachiya Kenta, Hiroshi Fujita, Tomomitsu Tani, Nobuyuki Ohte
    Abstract:

    Inertia Force of late systolic aortic flow (IF) is observed in the left ventricles (LV) with good systolic function. A lack of IF provokes isolated LV diastolic dysfunction and may be related to th...

  • abstract 4734 echodynamography is a novel useful technique in assessing Inertia Force of late systolic aortic flow and left ventricular early diastolic function
    Circulation, 2008
    Co-Authors: Kazuaki Wakami, Nobuyuki Ohte, Kaoru Asada, Toshihiko Goto, Hidekatsu Fukuta, Chika Kato, Seiji Mukai, Syogo Suzuki, Genjiro Kimura
    Abstract:

    We previously reported that the Inertia Force (IF) of the blood flowing out of left ventricle (LV) during late systolic phase produces greater LV elastic recoil Force and brings faster LV relaxation. Echodynamography (ALOKA) is a novel technique that enables us to obtain the flow velocity vector from conventional color Doppler velocity data on the range of interest at any phase of cardiac cycle without angle dependency. We investigated whether the flow velocity vector obtained at LV outflow tract (LVOT) in late systole had a relation with IF and invasively obtained LV relaxation parameters. Method: Study subjects were consecutive 26 patients who underwent diagnostic cardiac catheterization and conventional color Doppler imaging on the same day. Color Doppler image was acquired in the apical 3-chamber view. The analyses for flow velocity vector were performed offline using an echo image analyzer. The late systolic velocity of the blood flowing was obtained as an average value of the L VOT (V LVOT −late systole). LV pressure was obtained using a catheter-tipped micromanometer. From the recorded pressure waves, first derivative of LV pressure (dP/dt) and a time constant τ of LV pressure decay during isovolumic relaxation were calculated. From LV pressure-dP/dt relationships (phase loop), IF was determined. Results: A significant positive correlation was observed between the V LVOT -late systole and IF (r=0.75, p LVOT -late systole also had significant correlations both with peak negative dP/dt (r=0.49, p Conclusion: This study indicates that the V LVOT -late systole, which may be a noninvasive substitute for IF, has significant correlations with the parameters of LV relaxation. Echodynamography is a new useful technique to estimate LV early diastolic function.

Genjiro Kimura - One of the best experts on this subject based on the ideXlab platform.

  • Noninvasive Evaluation of the Inertia Force of Late Systolic Aortic Flow
    IFMBE Proceedings, 2020
    Co-Authors: Nobuyuki Ohte, Kazuaki Wakami, Motoaki Sugawara, Kiyomi Niki, Genjiro Kimura
    Abstract:

    The Inertia Force of late systolic aortic flow, which is generated by left ventricles with good contraction, may be a crucial parameter through which good left ventricular (LV) systolic function delivers its effect on LV early diastolic performance. We attempted to find noninvasive parameters of the Inertia Force using 2-dimensional ultrasound speckle tracking imaging of the left ventricle and wave intensity (WI) analysis at the right carotid artery. The LV strain along the long-axis at end-systole had significant correlations with both the LV ejection fraction (r=0.80, p

  • abstract 4734 echodynamography is a novel useful technique in assessing Inertia Force of late systolic aortic flow and left ventricular early diastolic function
    Circulation, 2008
    Co-Authors: Kazuaki Wakami, Nobuyuki Ohte, Kaoru Asada, Toshihiko Goto, Hidekatsu Fukuta, Chika Kato, Seiji Mukai, Syogo Suzuki, Genjiro Kimura
    Abstract:

    We previously reported that the Inertia Force (IF) of the blood flowing out of left ventricle (LV) during late systolic phase produces greater LV elastic recoil Force and brings faster LV relaxation. Echodynamography (ALOKA) is a novel technique that enables us to obtain the flow velocity vector from conventional color Doppler velocity data on the range of interest at any phase of cardiac cycle without angle dependency. We investigated whether the flow velocity vector obtained at LV outflow tract (LVOT) in late systole had a relation with IF and invasively obtained LV relaxation parameters. Method: Study subjects were consecutive 26 patients who underwent diagnostic cardiac catheterization and conventional color Doppler imaging on the same day. Color Doppler image was acquired in the apical 3-chamber view. The analyses for flow velocity vector were performed offline using an echo image analyzer. The late systolic velocity of the blood flowing was obtained as an average value of the L VOT (V LVOT −late systole). LV pressure was obtained using a catheter-tipped micromanometer. From the recorded pressure waves, first derivative of LV pressure (dP/dt) and a time constant τ of LV pressure decay during isovolumic relaxation were calculated. From LV pressure-dP/dt relationships (phase loop), IF was determined. Results: A significant positive correlation was observed between the V LVOT -late systole and IF (r=0.75, p LVOT -late systole also had significant correlations both with peak negative dP/dt (r=0.49, p Conclusion: This study indicates that the V LVOT -late systole, which may be a noninvasive substitute for IF, has significant correlations with the parameters of LV relaxation. Echodynamography is a new useful technique to estimate LV early diastolic function.

  • lack of Inertia Force of late systolic aortic flow is a cause of left ventricular isolated diastolic dysfunction in patients with coronary artery disease
    Journal of the American College of Cardiology, 2006
    Co-Authors: Takayuki Yoshida, Nobuyuki Ohte, Kazuaki Wakami, Hitomi Narita, Seiichiro Sakata, Kaoru Asada, Hiromichi Miyabe, Tomoaki Saeki, Genjiro Kimura
    Abstract:

    Objectives We investigated whether a lack of Inertia Force of late systolic aortic flow and/or apical asynergy provoke early diastolic dysfunction in patients with coronary artery disease (CAD). Background Left ventricular (LV) isolated diastolic dysfunction is a well-recognized cause of heart failure. Methods We evaluated LV apical wall motion and obtained left ventricular ejection fraction (LVEF) by left ventriculography in 101 patients who underwent cardiac catheterization to assess CAD. We also computed the LV relaxation time constant (Tp) and the Inertia Force of late systolic aortic flow from the LV pressure (P)–first derivative of left ventricular pressure (dP/dt) relation. Using color Doppler echocardiography, we measured the propagation velocity of LV early diastolic filling flow (Vp). Patients with LVEF ≥50% (preserved systolic function [PSF], n = 83) were divided into 2 subgroups: patients with Inertia Force (n = 53) and without Inertia Force (n = 30). No patient with systolic dysfunction (SDF) (LVEF Results The Tp was significantly longer in patients with SDF (85.7 ± 21.0 ms) and with PSF without Inertia Force (81.1 ± 23.6 ms) than in those with PSF with Inertia Force (66.3 ± 12.8 ms) (p  Conclusions An absence of Inertia Force in patients with PSF is one of the causes of isolated diastolic dysfunction in patients with CAD. Normal LV apical wall motion is substantial enough to give Inertia to late systolic aortic flow.

Toshihiko Goto - One of the best experts on this subject based on the ideXlab platform.

  • abstract 18465 the kinetic energy of left ventricular ejection flow during late systole produces Inertia Force of late systolic aortic flow and good left ventricular early diastolic function
    Circulation, 2016
    Co-Authors: Junki Yamamoto, Kazuaki Wakami, Toshihiko Goto, Hiroshi Fujita, Syunsuke Murai, Shohei Kikuchi, Tomonori Sugiura, Nobuyuki Ohte
    Abstract:

    Background: Inertia Force of late systolic aortic flow (IF), which plays a substantial role for the coupling between left ventricular (LV) contraction and relaxation, may depend on the kinetic energy of ejecting flow (KE) during late systole (KE-LS). Good LV contraction generated much greater KE during early systole (KE-ES) and the KE-ES should affect the KE-LS. We investigated whether the KE-ES and -LS obtained using Vector Flow Mapping (VFMTM, Hitachi-Aloka) had any relationships with both IF and LV relaxation parameters invasively obtained. Method: Study subjects were 30 patients who underwent diagnostic cardiac catheterization and echocardiography on the same day. Conventional color Doppler images were acquired in the apical 3-chamber view. KE was obtained using the commercially available software (Hitachi-Aloka) (Figure). We divided the LV ejection time into 3 equal phases, then the KE was computed as a sum of KE values frame by frame basis around ES and LS; The ES was defined as the first one-third ...

  • abstract 15137 vector flow mapping is a novel useful technique in assessing Inertia Force of late systolic aortic flow and left ventricular early diastolic function
    Circulation, 2014
    Co-Authors: Kazuaki Wakami, Toshihiko Goto, Hiroshi Fujita, Tomomitsu Tani, Kenta Hachiya, Syunsuke Murai, Hidekatsu Fukuta, Nobuyuki Ohte
    Abstract:

    Background: We previously reported that the Inertia Force (IF) of blood flowing out of left ventricle (LV) during late-systole produces greater LV elastic recoil Force and brings faster LV relaxation. Vector flow mapping (VFMTM, Hitachi-Aloka) enables us to see blood flow velocity vectors that are generated from conventional color Doppler imaging data at any phase of cardiac cycle without angle dependency. Using VFM, kinetic energy (KE) of ejecting blood flow during systole at the LV outflow tract (LVOT) can be obtained. Thus, we investigated whether the KE obtained at the LVOT during late systole (KE-ls) had any relations with the IF and invasively obtained LV function parameters. Method: Study subjects were 33 patients who underwent diagnostic cardiac catheterization and echocardiographic examination on the same day. Color Doppler images were acquired in the apical 3-chamber view. The frame rate ranged was from 40 to 51 frames per minute. Data analyses were performed offline using the commercially avail...

  • abstract 12333 do the patients with Inertia Force of late systolic aortic flow have less incidence of heart failure
    Circulation, 2013
    Co-Authors: Toshihiko Goto, Kazuaki Wakami, Takafumi Kato, Hachiya Kenta, Hiroshi Fujita, Tomomitsu Tani, Nobuyuki Ohte
    Abstract:

    Inertia Force of late systolic aortic flow (IF) is observed in the left ventricles (LV) with good systolic function. A lack of IF provokes isolated LV diastolic dysfunction and may be related to th...

  • abstract 4734 echodynamography is a novel useful technique in assessing Inertia Force of late systolic aortic flow and left ventricular early diastolic function
    Circulation, 2008
    Co-Authors: Kazuaki Wakami, Nobuyuki Ohte, Kaoru Asada, Toshihiko Goto, Hidekatsu Fukuta, Chika Kato, Seiji Mukai, Syogo Suzuki, Genjiro Kimura
    Abstract:

    We previously reported that the Inertia Force (IF) of the blood flowing out of left ventricle (LV) during late systolic phase produces greater LV elastic recoil Force and brings faster LV relaxation. Echodynamography (ALOKA) is a novel technique that enables us to obtain the flow velocity vector from conventional color Doppler velocity data on the range of interest at any phase of cardiac cycle without angle dependency. We investigated whether the flow velocity vector obtained at LV outflow tract (LVOT) in late systole had a relation with IF and invasively obtained LV relaxation parameters. Method: Study subjects were consecutive 26 patients who underwent diagnostic cardiac catheterization and conventional color Doppler imaging on the same day. Color Doppler image was acquired in the apical 3-chamber view. The analyses for flow velocity vector were performed offline using an echo image analyzer. The late systolic velocity of the blood flowing was obtained as an average value of the L VOT (V LVOT −late systole). LV pressure was obtained using a catheter-tipped micromanometer. From the recorded pressure waves, first derivative of LV pressure (dP/dt) and a time constant τ of LV pressure decay during isovolumic relaxation were calculated. From LV pressure-dP/dt relationships (phase loop), IF was determined. Results: A significant positive correlation was observed between the V LVOT -late systole and IF (r=0.75, p LVOT -late systole also had significant correlations both with peak negative dP/dt (r=0.49, p Conclusion: This study indicates that the V LVOT -late systole, which may be a noninvasive substitute for IF, has significant correlations with the parameters of LV relaxation. Echodynamography is a new useful technique to estimate LV early diastolic function.

Hiroshi Fujita - One of the best experts on this subject based on the ideXlab platform.