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Left ventricular systolic intraventricular flow field assessment in hyperthyroidism patients using vector flow
Bin-Yu Zhou1, Jing Wang2, Ming-Xing Xie1
1Department of Ultrasound, Hubei Provincial Key Laboratory of Molecular Imaging, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
Summary
Vector Flow Mapping (VFM) reveals altered left ventricular (LV) hydrodynamics in hyperthyroidism (HT) patients, showing increased LV flow and vortex activity. This novel method may aid in early detection of abnormal ventricle contraction in clinical settings.
Area of Science:
- Cardiology
- Medical Imaging
- Hemodynamics
Background:
- Intraventricular hydrodynamics are crucial for assessing cardiac function.
- Vector Flow Mapping (VFM) is an emerging technique for visualizing cardiac flow patterns and identifying pathophysiological conditions.
Purpose of the Study:
- To evaluate the utility of VFM in assessing left ventricular (LV) systolic hemodynamics in patients with simple hyperthyroidism (HT).
- To compare LV flow patterns between HT patients and healthy controls using VFM.
Main Methods:
- Thirty-seven HT patients and 38 healthy controls underwent VFM analysis of the LV apical long-axis view.
- Key parameters measured included peak systolic velocity (Vs), peak systolic flow (Fs), total systolic negative flow (SQ), velocity gradient (ΔV), and half-distance velocity (V1/2).
- Analysis included velocity vectors, streamlines, and vortex distribution.
Main Results:
- Conventional parameters (LVEF, LVEDD, LAD) showed no significant differences between groups.
- HT patients exhibited brighter flow, more vortices, non-uniform flow distribution, and discontinuous streamlines compared to controls.
- HT group showed significantly higher Vs, Fs, SQ, ΔV, and V1/2 values (P<0.01).
- ΔV positively correlated with serum free thyroxine (FT4) (r=0.48, P<0.01).
- LVEDD, FT4, and body surface area (BSA) influenced ΔV.
Conclusions:
- Simple hyperthyroidism leads to compensatory increases in unstable left ventricular systolic hydrodynamics.
- VFM is a promising tool for the early detection of abnormal ventricular contraction in clinical practice.
