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Diastolic flow characteristics of severely impaired left ventricles: a pulsed Doppler ultrasound study
B J Delemarre1, H Bot, A S Pearlman
1Department of Cardiology, Academic Medical Center, Amsterdam, The Netherlands.
Insights
Diastolic function in patients with dilated left ventricles due to ischemic heart disease shows delayed apical blood flow compared to mitral inflow. This may indicate abnormal apical wall motion impacting left ventricular relaxation.
Area of Science:
- Cardiology
- Echocardiography
- Physiology
Background:
- Dilated left ventricle is a common consequence of ischemic heart disease.
- Assessing diastolic function is crucial for understanding cardiac health.
Purpose of the Study:
- To investigate the influence of left ventricular relaxation on transmitral and apical diastolic flow patterns.
- To compare diastolic flow patterns in healthy individuals and patients with dilated left ventricles.
Main Methods:
- Pulsed Doppler echocardiography was used to study left ventricular inflow.
- Range ambiguity was applied for simultaneous display of Doppler shifts at different depths.
Main Results:
- In healthy individuals, diastolic Doppler shift curves at the mitral valve and apex had a synchronous onset.
- Patients with dilated left ventricles exhibited a time delay (160-360 ms) between mitral and apical flow onset.
Conclusions:
- Delayed apical diastolic flow in patients suggests impaired left ventricular relaxation.
- Abnormal apical wall motion may contribute to the observed time delay in diastolic flow patterns.
Abstract:
Left ventricular inflow was studied with pulsed Doppler echocardiography in 12 normals and 12 patients with a dilated left ventricle as a result of ischemic heart disease. To study the influence of left ventricular relaxation on both the transmitral and apical diastolic flow patterns, we applied range ambiguity. This provides simultaneous display of Doppler shifts obtained at different depths. The diastolic Doppler shift curves at the mitral valve and apical level in normals had the same time of onset, whereas there was an apparent time delay in the patients with heart disease (range 160-360 ms). This might be caused by absence of a normal apical wall motion in these patients.