Key result
Unshielded multichannel mapping of fetal magnetocardiograms using FastICA processing was feasible after the 32nd gestational week, enabling contactless assessment of fetal cardiac electrophysiology.
Why the study?
Can multichannel mapping of fetal magnetocardiogram be reliably performed in an unshielded hospital setting?
Observational (n=6)
Can multichannel mapping of fetal magnetocardiogram be reliably performed in an unshielded hospital setting?
Multichannel mapping of fetal magnetocardiogram can be feasibly performed in an unshielded clinical environment after the 32nd gestational week, allowing for contactless assessment of fetal cardiac electrophysiology.
Answers are grounded in this paper and cite their sources.
May enable contactless fetal assessment in routine settings after 32 weeks; leaves open validation in larger cohorts.
OBJECTIVES: To evaluate the feasibility of unshielded in-hospital multichannel mapping of fetal magnetocardiogram (FMCG), with a 36-channel system for standard adult magnetocardiographic (MCG) recordings, and its reliability according to the recommended standards for FMCG. METHODS: FMCG was ambulatory mapped with a 36-channel MCG system, in six normal pregnancies at different gestational ages. MCG analysis included adaptive digital filtering of 50 Hz, signal averaging, reconstruction of magnetic field distribution (MFD) and source localization. Fixed Point Independent Component Analysis algorithm (FastICA) was used to reconstruct the FMCG, separating them from maternal contamination and noise. RESULTS: The quality of FMCG recorded after the 32nd gestational week and reconstructed with FastICA was close to FMCG obtained in shielded rooms, and good enough to measure cardiac intervals and heart rate variability parameters. In two cases, reconstruction of the MFD during the QRS allowed three-dimensional localization of ventricular sources. CONCLUSIONS: A first demonstration has been given that multichannel mapping of FMCG can be performed in unshielded clinical environments, with resolution good enough for contactless assessment of fetal cardiac electrophysiology. FastICA processing on unshielded FMCG, recorded after the 32nd week, provided beat-to-beat analysis and heart rate variability assessment. Further work is needed to improve signal reconstruction in early pregnancy.
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Brisinda et al. (2005) conducted an observational in Normal pregnancies (n=6). Unshielded multichannel mapping of fetal magnetocardiogram (FMCG) was evaluated on Feasibility and reliability of unshielded in-hospital multichannel mapping of FMCG. Unshielded multichannel mapping of fetal magnetocardiograms using FastICA processing was feasible after the 32nd gestational week, enabling contactless assessment of fetal cardiac electrophysiology.
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