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[Color M-mode Doppler analysis of left ventricular inflow in pediatric patients]
Y Okajima1, K Suzuki, T Fujiwara
1Division of Cardiology, Chiba Children's Hospital.
Journal of Cardiology
|October 23, 1998
Summary
Color M-mode Doppler echocardiography effectively analyzes pediatric left ventricular (LV) filling. The mitral-apical time difference (M-AP) parameter differentiates normal from failing hearts, proving useful for assessing diastolic function.
Area of Science:
- Cardiovascular Imaging
- Pediatric Cardiology
- Echocardiography
Background:
- Assessing left ventricular (LV) diastolic function in pediatric patients is crucial for diagnosing heart conditions.
- Traditional echocardiographic parameters may not fully capture diastolic dysfunction in children.
- Novel Doppler techniques are needed to improve the evaluation of LV filling patterns.
Purpose of the Study:
- To evaluate the clinical utility of color M-mode Doppler echocardiography for analyzing LV filling in pediatric patients.
- To assess the mitral-apical time difference (M-AP) as a novel parameter for pediatric diastolic function assessment.
- To compare M-AP with established echocardiographic and catheter-derived hemodynamic measurements.
Main Methods:
- Color M-mode Doppler echocardiography was used to obtain LV inflow patterns in pediatric patients.
- The mitral-apical time difference (M-AP) was calculated as the time between peak velocities at the mitral tip and apical region.
- M-AP was correlated with catheter-derived data (tau, pulmonary capillary wedge pressure) and compared between normal and failing LV groups.
Main Results:
- M-AP showed significant positive correlations with LV relaxation time constant (tau) and pulmonary capillary wedge pressure.
- M-AP was significantly longer in children with LV ejection fraction < 40% compared to those with normal function.
- M-AP effectively differentiated normal cardiac function from heart failure, independent of LV size or heart rate.
Conclusions:
- The mitral-apical time difference (M-AP) derived from color M-mode Doppler echocardiography is a valuable parameter for assessing pediatric diastolic function.
- M-AP demonstrates superior ability to distinguish between normal and failing LV compared to traditional parameters like E/A ratio.
- This novel echocardiographic approach offers a clinically useful tool for non-invasive evaluation of diastolic function in pediatric cardiology.