Related Experiment Videos
Change in filling pattern with preload reduction reflects left ventricular relaxation
Masaki Tanabe1, Katsuya Onishi, Kaoru Dohi
1First Department of Internal Medicine, Mie University School of Medicine, Mie, Japan.
International Journal of Cardiology
|January 29, 2005
Summary
Left ventricular filling patterns, assessed during preload reduction, can estimate left ventricular relaxation in patients with preserved ejection fraction. This method offers a way to gauge relaxation dynamics in specific cardiac conditions.
Area of Science:
- Cardiology
- Physiology
Background:
- Left ventricular (LV) filling is influenced by LV relaxation and left atrial pressure.
- Accurate assessment of LV relaxation is crucial for understanding diastolic function.
Purpose of the Study:
- To investigate if LV filling patterns during preload reduction can estimate LV relaxation in patients with preserved systolic function.
- To correlate LV filling parameters with the logistic time constant of LV relaxation.
Main Methods:
- Evaluated 26 patients with preserved LV ejection fraction (>45%).
- Used conductance catheter and microtip manometry to assess LV volume and pressure.
- Measured early diastolic (E) and atrial (A) filling velocities before and after preload reduction via caval occlusion.
Main Results:
- No significant baseline correlation between LV relaxation time constant and E/A velocity ratio.
- Significant correlation found between time constant and E/A ratio post-caval occlusion (r=-0.47, p=0.02).
- Stronger correlation observed between time constant and %E/A velocity change (r=-0.67, p<0.01).
Conclusions:
- LV filling patterns during preload reduction effectively estimate LV relaxation in patients with preserved ejection fraction.
- This non-invasive approach provides valuable insights into diastolic function.