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What parameters affect left ventricular diastolic flow propagation velocity? In vitro studies using color M-mode
Toshihiro Ogawa1, Lawrence N Scotten, David K Walker
1St. John Hospital & Medical Center, Detroit, MI, USA. julius.gardin@stjohn.org
Insights
This study shows how stroke volume, heart rate, and left ventricular compliance affect diastolic flow propagation velocity (Vp). These hemodynamic parameters are crucial for understanding early diastolic left ventricular filling.
Area of Science:
- Cardiovascular Physiology
- Echocardiography
- Hemodynamics
Background:
- Limited data exist on the relationship between hemodynamic parameters and left ventricular (LV) diastolic flow propagation velocity (Vp).
- Color M-mode Doppler echocardiography is used to measure Vp.
Purpose of the Study:
- To investigate the relationship between hemodynamic parameters and Vp in an in vitro model.
- To understand factors influencing early diastolic LV filling.
Main Methods:
- An in vitro LV model simulated diastolic inflow.
- Vp was measured under varying stroke volume, heart rate, LV volume, LV compliance, and transmitral flow (TMF) waveforms.
- Two TMF types were used: Type 1 (constant low diastasis flow) and Type 2 (no diastasis flow).
Main Results:
- Vp strongly correlated with stroke volume (r=0.98) and LV compliance (r=0.94).
- With Type 1 TMF, Vp correlated with heart rate (r=0.97), but not with Type 2 TMF.
- LV volume showed an inverse relationship with Vp under high compliance (r=-0.56).
Conclusions:
- These in vitro findings provide insights into the interplay of hemodynamic factors and Vp.
- The results may help elucidate mechanisms of early diastolic LV filling.
Background:
Insufficient data describe the relationship of hemodynamic parameters to left ventricular (LV) diastolic flow propagation velocity (Vp) measured using color M-mode Doppler echocardiography.
Methods:
An in vitro LV model used to simulate LV diastolic inflow with Vp measured under conditions of varying: 1) Stroke volume, 2) heart rate (HR), 3) LV volume, 4) LV compliance, and 5) transmitral flow (TMF) waveforms (Type 1: constant low diastasis flow and Type 2: no diastasis flow).
Results:
Univariate analysis revealed excellent correlations of Vp with stroke volume (r = 0.98), LV compliance (r = 0.94), and HR with Type 1 TMF (r = 0.97). However, with Type 2 TMF, HR was not associated with Vp. LV volume was not related to Vp under low compliance, but inversely related to Vp under high compliance conditions (r = -0.56).
Conclusion:
These in vitro findings may help elucidate the relationship of hemodynamic parameters to early diastolic LV filling.
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