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A wearable vital signs monitor at the ear for continuous heart rate and pulse transit time measurements.

Authors
Type
Published Article
Journal
Annual International Conference of the IEEE Engineering in Medicine and Biology Society
1557-170X
Publication Date
Volume
2012
Pages
2724–2727
Identifiers
DOI: 10.1109/EMBC.2012.6346527
PMID: 23366488
Source
Medline
License
Unknown

Abstract

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.

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