Author + information
- Masataka Sugahara,
- Nina Hasselberg,
- Marc Simon and
- John Gorcsan
Background: Vector flow mapping (VFM) is a novel non-invasive means to assess cardiac flow dynamics. Little is known about applications of VMF for right ventricular (RV) function. The aim was to use VMF to calculate RV energy loss (EL) and RV efficiency.
Methods: We studied 39 healthy subjects (aged 35±8 years, 38%female). Speckle tracking strain echo and VFM were performed (PROSOUND F75 Premier CV, Hitachi Corp.). RV EL was assessed from VFM color Doppler in the short axis view (Fig. A). EL time integrals (ETI, cJ) were calculated (right). Stroke work (SW) (cJ) was calculated by pulsed Doppler estimated pulmonary artery pressure (10^((-0.004 × Acceleration Time of RVOT)+2.1)) × RV stroke volume (RVOT area × velocity time integral) × 0.0139. RV Efficiency (EFF) was defined as the ratio of systolic RV ETI /SW.
Results: VFM and speckle tracking strain measurements were feasible in all subjects. RV EL demonstrated three peaks in one cardiac cycle: (Fig. B) mid-systole, early-diastole and end-diastole (5.80±3.59mW, 5.54±4.25mW, and 2.12±1.34mW). RV SW was 25.9±3.9 cJ. ETI in systole was 1.22±0.66cJ. EL in systole was inversely correlated with RV global longitudinal strain (r=-0.543, p<0.001) (Fig. C). EFF was correlated with RV global longitudinal strain (r=-0.482, p=0.003) (Fig. D).
Conclusions: Assessment of RV EL and RV EFF from VFM is a novel means to quantify RV function non-invasively. RV EFF in normal subjects was found to relate to RV global deformation and has promise to characterize cardiovascular diseases.
Poster Hall, Hall C
Saturday, March 18, 2017, 3:45 p.m.-4:30 p.m.
Session Title: New Technologies in Echocardiography
Abstract Category: 28. Non Invasive Imaging: Echo
Presentation Number: 1245-219
- 2017 American College of Cardiology Foundation