It is fairly well established that the higher-order aberrations of the eye fluctuate over relatively short time periods, but as yet there is no conclusive evidence regarding the origin of these fluctuations. We measured the aberrations and the pulse pressure wave simultaneously for five subjects. The aberrations were measured by using a Shack-Hartmann sensor sampling at 21.2 Hz. We decomposed t...

It has been predicted theoretically and shown experimentally that the arterial pulse wave velocity will depend on the state of the arterial wall, this varying between individuals as a function of age and within the individual according to site and, because the arterial wall does not obey Hooke's law, according to the internal pressure at any given moment. In the present research, comparisons we...

The relation between arterial function indices, such as pulse wave velocity and augmentation index with parameters derived from input impedance analysis, is still incompletely understood. Carotid pressure, central flow waveforms, and pulse wave velocity were noninvasively acquired in 2026 apparently healthy, middle-aged subjects (1052 women and 974 men) 35 to 55 years old at inclusion. Input an...

Carotid-to-radial pulse wave velocity (PWV(cr)) has been proposed to evaluate endothelial function. However, the measurement of PWV(cr) is not without limitations. A new simple approach could have wide application. Stiffness index (SI) is obtained by analysis of the peripheral pulse wave and gives reproducible information about stiffness of large arteries. This study assessed the effects of hyp...

E. Engelien, B. Strathen, Y. Bai, C. Puckert, R. Viga, R. Glocker, T. Hilbel, R. Kokozinski University Duisburg-Essen, Institute of Electronic Devices and Circuits, Bismarckstr. 81, D-47057 Duisburg University of Applied Sciences, Department of Physical Engineering, Neidenburger Str. 43, D-45877 Gelsenkirchen CGS Sensors GmbH, Erthalstr. 12, D-63739 Aschaffenburg [email protected], +...

The article deals with the investigation of pulse wave propagation in arteries. A part of work involves also design and realization of devices serving for scanning of pulse wave by reflective photoplethysmography. The work describes a use of microcontroller serving for data flow control, communication and analog signal digitalization using integrated analog to digital converter.

Cardiovascular refers to the Cardio (heart) and vascular (blood vessels). The system has two major functional parts: central circulation system and systemic circulation system. Central circulation includes the pulmonary circulation and the heart from where the pulse wave is generated. Systemic circulation is the path that the blood goes from and to the heart. (Green 1984) Pulse wave is detected...