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. 2018 Feb;4(2):284-287.
doi: 10.1016/j.jacep.2017.08.009.

Detection of Fetal Arrhythmia Using Optically-Pumped Magnetometers

Margo Batie  1 , Sarah Bitant  1 , Janette F Strasburger  2 , Vishal Shah  3 , Orang Alem  3 , Ronald T Wakai  1
Affiliations

Detection of Fetal Arrhythmia Using Optically-Pumped Magnetometers

Margo Batie et al. JACC Clin Electrophysiol. 2018 Feb.
No abstract available

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Figures

Figure 1
Figure 1
Photographs of (A) SQUID and (B) OPM fMCG systems. The OPM sensor array (circled) was supported by attaching it to a SQUID system.
Figure 2
Figure 2
Comparison of OPM and SQUID recordings from four fetuses with sustained arrhythmia. Postnatal ECGs are shown for the last three. All of the tracings are 5 seconds long. A) and B) are from a fetus at 33-4/7 weeks’ with extreme QTc prolongation (QTc> 700 ms), resulting in 3:1 AV block. The T-waves are indicated by arrows. C) and D) are from a fetus at 29 weeks’ with QTc prolongation. F) and G) are from a fetus at 33-6/7 weeks’ with a complex, irregular rhythm. As shown, the predominant rhythm was ventricular bigeminy, in which a sinus beat alternates with a premature ventricular contraction. I) and J) are from a fetus at 30-1/7 weeks’ with a low atrial rhythm, characterized by a low heart rate, inverted P-wave, and short PR interval.
Figure 2
Figure 2
Comparison of OPM and SQUID recordings from four fetuses with sustained arrhythmia. Postnatal ECGs are shown for the last three. All of the tracings are 5 seconds long. A) and B) are from a fetus at 33-4/7 weeks’ with extreme QTc prolongation (QTc> 700 ms), resulting in 3:1 AV block. The T-waves are indicated by arrows. C) and D) are from a fetus at 29 weeks’ with QTc prolongation. F) and G) are from a fetus at 33-6/7 weeks’ with a complex, irregular rhythm. As shown, the predominant rhythm was ventricular bigeminy, in which a sinus beat alternates with a premature ventricular contraction. I) and J) are from a fetus at 30-1/7 weeks’ with a low atrial rhythm, characterized by a low heart rate, inverted P-wave, and short PR interval.
Figure 2
Figure 2
Comparison of OPM and SQUID recordings from four fetuses with sustained arrhythmia. Postnatal ECGs are shown for the last three. All of the tracings are 5 seconds long. A) and B) are from a fetus at 33-4/7 weeks’ with extreme QTc prolongation (QTc> 700 ms), resulting in 3:1 AV block. The T-waves are indicated by arrows. C) and D) are from a fetus at 29 weeks’ with QTc prolongation. F) and G) are from a fetus at 33-6/7 weeks’ with a complex, irregular rhythm. As shown, the predominant rhythm was ventricular bigeminy, in which a sinus beat alternates with a premature ventricular contraction. I) and J) are from a fetus at 30-1/7 weeks’ with a low atrial rhythm, characterized by a low heart rate, inverted P-wave, and short PR interval.
Figure 2
Figure 2
Comparison of OPM and SQUID recordings from four fetuses with sustained arrhythmia. Postnatal ECGs are shown for the last three. All of the tracings are 5 seconds long. A) and B) are from a fetus at 33-4/7 weeks’ with extreme QTc prolongation (QTc> 700 ms), resulting in 3:1 AV block. The T-waves are indicated by arrows. C) and D) are from a fetus at 29 weeks’ with QTc prolongation. F) and G) are from a fetus at 33-6/7 weeks’ with a complex, irregular rhythm. As shown, the predominant rhythm was ventricular bigeminy, in which a sinus beat alternates with a premature ventricular contraction. I) and J) are from a fetus at 30-1/7 weeks’ with a low atrial rhythm, characterized by a low heart rate, inverted P-wave, and short PR interval.
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References

    1. Donofrio MT, Moon-Grady AJ, Hornberger LK, et al. Diagnosis and treatment of fetal cardiac disease: a scientific statement from the American Heart Association. Circulation. 2014;129:2183–242. - PubMed
    1. Fagaly RL. Neuromagnetic instrumentation. Adv Neurol. 1990;54:11–32. - PubMed
    1. Budker D, Romalis M. Optical magnetometry. Nat Phys. 2007;3:227–234.

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