Optical Monitoring Of The Heart Beat
Author(s)
M. De Melis, M. Grigioni, U. Morbiducci & L. Scalise
Abstract
Monitoring heart beat and in venereal cardiac activity is a typical task requested
in a clinical environment to analyze a great variety of patient’s conditions.
Obtaining this information without contact with the patient’s skin represents a
future tool in a large number of fields also outside the clinics. Generally this task
cannot be accomplished when the patient’s condition determines impairment of
their health so that having skin contact or any other surface contact has to be
avoided, or when the type of functional situation (people with or within confined
environment) does not permit the use of any kind of sensors or electrodes within
the examination environment. We propose a new technique using laser
vibrometry capable of obtaining non-contact monitoring of the heart rate (HR)
and retrieving physiological quantities characterizing cardiac activity measuring
the motion’s properties of the external surface of the human chest on several
cardiovascular sites or on the carotideo site. ECG and vibratory signals from the
chest wall and carotid were simultaneously recorded. To do this, a measurement
bench was realized based on a laser Doppler vibrometer. Recorded signals were
collected afterwards to measure the consecutive RR and vibrocardiographic
(VV) intervals. Sequences of both RR and corresponding VV intervals were
obtained; based on these, tachograms were built. Poincare maps, displaying the
relationship between a point and its consecutive in a time series, were obtained.
In order to stress the limits of the vibratory signals in representing HR variability
(HRV) as the ECG, the power spectral densities of the tachograms were
performed. A comparison of the obtained results highlights the coincidence for
ECG and the chest wall vibratory investigated information content, confirming
the proposed method as an alternative to the typical ECG method when non
contact HR activity monitoring must be provided.
Keywords: cardiac displacement, heart rate variability, laser Doppler
vibrometry, electrocardiography, tachograms, spectral analysis.
Keywords
cardiac displacement, heart rate variability, laser Doppler
vibrometry, electrocardiography, tachograms, spectral analysis.
Related Book
Other papers in this volume
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