PMC7483932_01
Case 1 fECG done at 23 weeks showing prolonged QT interval, isolated from the maternal tracing with LQTS.
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F1
Notably, fECG was able to isolate the fetal signal with a prolonged QT interval from the maternal tracing with LQTS (Figure 1).
Case 1. Panel on the left is fECG tracing done at 27 weeks gestation, demonstrating low fetal heart rate 125 bpm and prolonged QTc 544 ms. Panel on the right shows fMCG done at 25 weeks gestation; also showing a prolonged QT interval with averaged QTc 573 ms. Both consistent with LQTS.
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F2
Fetal ECG was repeated at 27 weeks gestation with similar findings to the prior fECG and the fMCG (Figure 2).
PMC7483932_02
PMC7483932_03
Case 3. Panel on left is fECG done at 27 weeks gestation normal QT interval (QTc 433 ms). Panel on right is fMCG at 22 weeks gestation; also normal with an averaged QTc 451 ms.
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F3
The mother was referred for fMCG at 22 weeks which demonstrated a normal fetal heart rate and normal averaged QTc interval of 451 ms - i.e., without evidence of LQTS, as seen on fetal ECG (Figure 3).