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Updated: May 31, 2026
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Murine Fetal Echocardiography
Published on: February 15, 2013
Fetal left modified myocardial performance index: technical refinements in obtaining pulsed-Doppler waveforms
N Meriki1, A Izurieta, A W Welsh
1Department of Obstetrics and Gynaecology, King Saud University, Riyadh, Saudi Arabia.
Summary
Optimizing machine settings like wall motion filter and angle of insonation significantly improves the repeatability of fetal myocardial performance index (MPI) measurements. Selecting the peak of the valve click further enhances accuracy for reliable fetal cardiac assessments.
Area of Science:
- Cardiology
- Fetal Medicine
- Medical Imaging
Background:
- The fetal myocardial performance index (MPI) is a valuable tool for assessing cardiac function.
- Previous studies have reported significant variability in MPI measurements, potentially due to inconsistent methodologies.
Purpose of the Study:
- To evaluate how machine settings and valve click phase influence the repeatability of fetal left modified MPI (Mod-MPI) measurements.
Main Methods:
- Prospective evaluation of Mod-MPI in 157 normal fetuses (19-36 weeks' gestation).
- Assessed the impact of wall motion filter (WMF), angle of insonation, Doppler aliasing, and valve click phase on measurement repeatability.
Main Results:
- Baseline repeatability (Intraclass Correlation Coefficient - ICC) was 0.22.
- Increasing WMF to 300 Hz or 500 Hz improved ICC to 0.60 and 0.55.
- An angle of insonation < 15° and absence of aliasing, with WMF at 300 Hz, yielded ICCs of 0.85-0.87.
Conclusions:
- Optimizing machine settings (WMF 300 Hz, angle < 15°, no aliasing) and selecting the valve click peak significantly enhance Mod-MPI measurement repeatability.
- Standardization of MPI measurement techniques is crucial to reduce variability in published normal ranges.
