INTRODUCTION Past findings on the diagnostic sensitivity of vaginal photoplethysmography are limited by testing among women with heterogeneous sexual dysfunctions and by the use of statistical techniques that are unable to assess how changes in subjective arousal are associated with changes in physiological arousal. AIMS The aims of this study were to: (i) test the sensitivity of vaginal phot...

2 Basic implementation ......................................................................................................... 4 2.1 The optoelectronic parts ......................................................................................................... 4 2.2 The electronic circuit .........................................................................................................

Photoplethysmography (PPG) provides an estimation of blood flow by measuring the dynamic attenuation of visual or infrared light by the blood volume present in tissue. The contour of the pulsatile component of the PPG signal has been found to include content descriptive of vascular health. PPG pulse signals can be easily obtained from the tissue pads of the ears, fingers and toes where there is...

Non-contact photoplethysmography (PPG) provides multiple benefits over in-contact methods, but is not as tolerant to motion due to the lack of mechanical coupling between the subject and sensor. One limitation of non-contact photoplethysmography is discussed here, specifically looking at the topology and optical variations of the skin and how this impacts upon the ability to extract a photoplet...

S. Zaunseder, Institute of Biomedical Engineering, TU Dresden, Germany, [email protected] T. Wirthgen, Fraunhofer IVI, Dresden, Germany, [email protected] G. Lempe, Institute of Biomedical Engineering, TU Dresden, Germany, [email protected] H. Malberg, Institute of Biomedical Engineering, TU Dresden, Germany, [email protected] S. Zipser, Fr...

We combine parameter-free calculations of the transmission and reflection matrices for clean and dirty interfaces with a scattering-theory formulation of Andreev reflection (AR) generalized to spin-polarized systems in order to critically evaluate the use of an extended Blonder-Tinkham-Klapwijk (BTK) model to extract values of the spin polarization for ferromagnetic metals from measurements of ...

BACKGROUND The aim of the present pilot study was to determine if pulse photoplethysmography amplitude (PPGA) could be used as an indicator of critical illness and as a predictor of higher need of care in emergency department patients. METHODS This was a prospective observational study. We collected vital signs and one minute of pulse photoplethysmograph signal from 251 consecutive patients a...

This paper discusses the methodology for selecting a set of relevant nonstationary features to increase the specificity of the obstructive sleep apnea detector. Dynamic features are extracted from time-evolving spectral representation of photoplethysmography envelope recordings. In this regard, a time-evolving version of the standard linear multivariate decomposition is discussed to perform sto...

Background. Ivabradine is an If ion current inhibitor that has proved to reduce mortality in patients with systolic heart failure by slowing heart rate without decreasing myocardial contractility. Photoplethysmography is a simple, low-cost optical technique that can evaluate vascular function and detect changes in blood flow, pulse, and swelling of tissular microvascular space. Objective. To ev...

" Sentential reflection " in the sense of [Fr03] is based on reflecting down from a category of classes. " Elemental sentential reflection " is based on reflecting down from a category of elemental classes. We present various forms of elemental sentential reflection, which are shown to interpret and be interpretable in certain set theories with large cardinal axioms.