Non-invasive Determination of HV Interval Using a Wearable Magnetocardiography Sensor
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Date
2023-05
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The Ohio State University
Abstract
This study aimed to make improvements on a research-in-progress MagnetoCardioGraphy (MCG) sensor used for measuring magnetic signals generated from the heart. The focus was placed particularly on measuring a new signal emanating from the His Bundle that the sensors had not yet been tested on. Detecting this signal would allow the His Ventricular (HV) interval to be obtained, which provides valuable clinical information. This sensor, constructed from an array of coils placed in a fixture, is placed over the patient's chest and couples to the magnetic fields generated by the heart. Because the His Signal is so small, improvements to the existing sensor were necessary. This was achieved in the form of performing simulations and testing within a shielded room, as well as adding additional coils to the existing array for more extended signal averaging. The sensor was tested on a new phantom model that emulated the His Bundle signal by: (a) lowering the magnitude of the signal, and (b) adjusting the size of the source to match what we would expect from the His Bundle. These tests were performed, and the sensors were able to see signals down to the 10-11 T magnitude, slightly larger than the desired field emanated from the His Bundle of about 10-13 T.
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Keywords
His-Purkinje, Wearables, Electrical, Magnetocardiography