Wearable Dual-Modality Plethysmography for Arterial Modulation and Blood Pressure Dip

Smartwatch-form-factor prototype combining dry-electrode impedance plethysmography (IPG) with PPG. Pilot study N=2: IPG leads PPG in time across ventral and dorsal sites (read by the authors as deeper penetration); IPG was more sensitive to arterial recovery after brachial artery modulation on the ventral forearm; over 60-minute naps PPG stayed morphologically stable while IPG evolved, showing distinct pulse-wave archetypes. No accuracy metrics against a reference BP are stated in the abstract.

• Form factor: wrist

Continuous, non-invasive cardiovascular monitoring is limited by the superficial sensing depth of Photoplethysmography (PPG), which is susceptible to peripheral artifacts. This study evaluates a wearable dual-modality prototype integrating dryelectrode Impedance Plethysmography (IPG) and PPG within a smartwatch form factor. Results from a pilot study (N=2) demonstrate that IPG signals exhibit a temporal lead over PPG across ventral and dorsal sites, supporting its greater penetration depth. During brachial artery modulation, IPG showed superior sensitivity to arterial recovery on the ventral forearm. Furthermore, 60-minute napping sessions revealed that while PPG remained morphologically stable, IPG signals underwent significant evolution, capturing distinct pulsewave archetypes. These findings suggest that wearable IPG provides a high-fidelity window into deep systemic hemodynamics typically reserved for clinical instrumentation.

Verbatim from the publisher's DOI record (opens in a new tab) · Publisher licence: http://creativecommons.org/licenses/by/4.0/

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