Decomposition and modeling of signal shapes of single point cardiac monitoring

Abstract

We introduce a novel method for electronic recording of cardiac signals from a single point at the skin in contrast to classical differential electrocardiography (ECG). Ultralownoise transistor devices with an adaptable, auto-stabilizing transimpedance amplifier are able to measure tiny skin potential modulations from a single contact electrode located at an individual’s wrist (single-point cardiography-SPC). Although SPC signals were highly prone to interspersed noise, they contained periodic patterns. In an electromagnetically shielded setting, we could clearly extract breathing and cardiac rhythms from the acquired SPC signals. As the reference, we measured ECG in parallel. Several signal-processing techniques like smoothening, correlation, decomposition and signal extraction showed that SPC signals contain breathing and periodic heart potential variations, which are time-correlated with ECG. In the future, we intent to use this novel technique to measure heart signals from patients in different health conditions.

Contactless, Battery-free, and Stretchable Wearable for Continuous Recording of Seismocardiograms

“…In the future, we are interested in integrating this SCG electrode in a multifunctional wearable patch system to enable a sensor fusion system for continuous cardiovascular monitoring. SCG is an additional source of information and eventually a very good reference in particular for the novel single point cardiography (SPC) technique that we recently introduced …”

Review—Human-Body Powered Biosensing Textiles: Body-Power Generating Wearables Based on Textiles for Human Biomonitoring

“…Moreover, the unique characteristic of textiles such as clothes is that they could cover a large area of our body, such that more than one biosignal could potentially be measured. For example, the body motions/gestures, 12 the heart rate (HR), 13 the pulse pressure (PP) and/ or the blood pressure (BP), 14,15 the electrocardiogram (ECG), 16,17 the electromyography (EMG), 18 the surface body temperature, 19 the respiration, 20 and the biochemicals. 21 Furthermore, the e-textiles can also be integrated into a sensor node for the Internet of Things (IoT) or into a body sensor network (BSN) system by combining them with signal processing circuitry and wireless modules.…”