Journal ArticleDOI
Relation between heart rate and pulse transit time during paced respiration
TLDR
There is a strong relationship between PTT changes and RR interval changes, but these changes are not in phase.Abstract:
Pulse transit time (PTT) is a simple, non-invasive measurement, defined as the time taken from a reference time for the pulse pressure wave to travel to the periphery. PTT is influenced by heart rate, blood pressure changes and the compliance of the arteries, but few quantitative data are available describing the factors which influence PTT. The aim of this study was to investigate the relationship between the cardiac beat-to-beat interval (RR) and PTT, using paced respiration to generate changes in both variables. We analysed PTT and RR interval from 15 normal healthy subjects during paced breathing, and the cross-correlation function between PTT and RR was used to quantify their relationship. Over the 15 subjects, the maximum change in PTT ranged from 7 to 23 ms with a mean +/- standard deviation of 14 +/- 5 ms, and that in RR interval from 86 to 443 ms (241 +/- 102 ms). Examining changes over time, the best correlation (r = +0.69, p < 0.01) was obtained when PTT was advanced relative to RR, with a change in RR followed by a corresponding change in PTT 3.17 +/- 0.76 beats later. We conclude that there is a strong relationship between PTT changes and RR interval changes, but these changes are not in phase.read more
Citations
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Journal ArticleDOI
Photoplethysmography and its application in clinical physiological measurement.
TL;DR: Photoplethysmography is a simple and low-cost optical technique that can be used to detect blood volume changes in the microvascular bed of tissue and is often used non-invasively to make measurements at the skin surface.
Patent
Body-worn vital sign monitor
TL;DR: In this paper, a body-worn vital sign monitor that measures a patient's vital signs (e.g. blood pressure, SpO2, heart rate, respiratory rate, and temperature) while simultaneously characterizing their activity state (i.e. resting, walking, convulsing, falling) and posture (upright, supine).
Journal ArticleDOI
Assessment of heart rate variability derived from finger-tip photoplethysmography as compared to electrocardiography.
TL;DR: HRV can also be reliably estimated from the PPG based PP interval method and Bland-Altman analysis showed high degree of agreement between the two methods for all the parameters of HRV.
Patent
Body-worn monitor for measuring respiration rate
TL;DR: In this paper, an impedance pneumography (IP) sensor is connected to at least two electrodes, and a processing system that receives and processes signals from the electrodes to measure an IP signal.
Patent
Body-worn pulse oximeter
TL;DR: In this article, a body-worn system that continuously measures pulse oximetry and blood pressure, along with motion, posture, and activity level, from an ambulatory patient is presented.
References
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Assessment of Arterial Distensibility by Automatic Pulse Wave Velocity Measurement: Validation and Clinical Application Studies
Roland Asmar,Athanase Benetos,Jirar Topouchian,Pierre Laurent,Bruno Pannier,Anne-Marie Brisac,Ralph Target,Bernard I. Levy +7 more
TL;DR: The aim of this study was to evaluate the accuracy of a new automatic device to measure it and then to analyze the major determinants of pulse wave velocity by application of this device in a large population.
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TL;DR: Interventions to improve aerobic capacity may mitigate the stiffening of the arterial tree that accompanies normative aging, as shown in the example of endurance trained older men relative to their less active age peers.
Book
Digital Signal Processing: A Practical Approach
TL;DR: This book covers a number of DSP techniques that are of particular relevance to industry such as adaptive filtering and multirate processing, and offers modern coverage of the fundamentals, implementation and applications of digital signal processing techniques from a practical point of view.
Journal ArticleDOI
Hemodynamic fluctuations and baroreflex sensitivity in humans: a beat-to-beat model
TL;DR: The simulated response of the model to an imposed increase of BP is shown to correspond with the BP and HR response in patients after administration of a BP-increasing drug, such as phenylephrine.
Journal ArticleDOI
Heart rate variability.
TL;DR: Recent studies indicate that heart rate variability might soon become a similarly powerful tool for risk prediction and monitoring of disease progression in congestive heart failure and for monitoring or reinnervation after heart transplantation.