Why the study?
Does a wearable vital signs monitor at the ear using Pulse Transit Time improve tracking of mean arterial blood pressure changes compared to the pulse arrival time method?
Does a wearable vital signs monitor at the ear using Pulse Transit Time improve tracking of mean arterial blood pressure changes compared to the pulse arrival time method?
A novel ear-worn wearable device measuring ECG, BCG, and PPG can effectively track changes in mean arterial blood pressure using Pulse Transit Time.
May not yet change MAP monitoring practice; leaves open prospective validation of ear-worn PTT versus PAT.
A continuous, wearable and wireless vital signs monitor at the ear is demonstrated. The device has the form factor of a hearing aid and is wirelessly connected to a PC for data recording and analysis. The device monitors the electrocardiogram (ECG) in a single lead configuration, the ballistocardiogram (BCG) with a MEMS triaxial accelerometer, and the photoplethysmograms (PPG) with 660 nm and 940 nm LED sources and a static photocurrent subtraction analog front end. Clinical tests are conducted, including Valsalva and head-up tilt maneuvers. Peak timing intervals between the ECG, BCG and PPG are extracted and are shown to relate to pre-ejection period and mean arterial blood pressure (MAP). Pulse Transit Time (PTT) extracted from cross-correlation between the PPG and BCG shows improved results compared to the pulse arrival time (PAT) method for tracking changes in MAP.
No takes yet. Share an insight, caveat, or question.
Winokur et al. (2012) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: