Efficacy and safety of fetal magnetocardiography for detecting fetal cardiac magnetic signals: A 2-center, single-arm, prospective clinical trial
Main finding · Detection rate for QRS complexes and RR intervalsResult — go to the resultRate difference 9.03% 95% CI 3.50–14.56Authors' conclusion
fMCG was superior to fECG in detecting RR and QRS signals. Moreover, fMCG uniquely enabled visualization of other intervals critical to arrhythmia diagnosis.
Study context
- Population
- Pregnant women aged ≥18 years with gestational age >18 weeks
- Participants
- 342 women
- Exposure
- Fetal magnetocardiography (fMCG) vs fetal electrocardiography (fECG)
- Outcome
- Detection rate of fetal cardiac waveforms reflecting atrial and ventricular rhythm relationships
Methodological details2-center
- 2-center
Main finding
As reported in the abstract
Detection rate for QRS complexes and RR intervals
Rate difference
9.03%
95% CI 3.50–14.56
P < 0.01
By group
fMCGvs fECG
rate difference 9.03% (95% CI 3.50–14.56); P < 0.01
Observational data: associations, not effects.
Further findings
Detection rate for QRS complexes and RR intervals, per-protocol set
P < 0.01
- Detection of other intervals and waves (only fMCG could reliably detect)
- 86.22% · PR intervals · P waves 86.22% · T waves 78.89% · QT/corrected QT intervals 78.89%
- Detection rate for QRS complexes and RR intervals, per-protocol set: per-protocol set (n = 340)
Safety
- Adverse events, rare and unrelated to the device
- n = 1; 0.29%
Original publication
Efficacy and safety of fetal magnetocardiography for detecting fetal cardiac magnetic signals: A 2-center, single-arm, prospective clinical trial. Heart Rhythm. Published 20 November 2025. doi:10.
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