Arterial flow waveforms from pulse oximetry compared with measured Doppler flow waveforms
نویسندگان
چکیده
منابع مشابه
Evaluation of factors influencing arterial Doppler waveforms in an in vitro flow phantom
PURPOSE The aim of this study was to investigate factors that influence arterial Doppler waveforms in an in vitro phantom to provide a more accurate and comprehensive explanation of the Doppler signal. METHODS A flow model was created using a pulsatile artificial heart, rubber or polyethylene tubes, a water tank, and a glass tube. Spectral Doppler tracings were obtained in multiple combinatio...
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Characteristics of blood-flow velocities were investigated at different sites in two types of coronary artery bypass grafts, sequential saphenous vein grafts (SSVG) and internal mammary artery grafts (IMAG). The latter appear to have the longest life span. The patency rate of the side-to-side anastomosis of the SSVG is better than that of the end-to-side anastomosis. The SSVG was anastomosed to...
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We describe a method of constructing a sequence of phase coded waveforms with perfect autocorrelation in the presence of Doppler shift. The constituent waveforms are Golay complementary pairs which have perfect autocorrelation at zero Doppler but are sensitive to nonzero Doppler shifts. We extend this construction to multiple dimensions, in particular to radar polarimetry, where the two dimensi...
متن کاملCell membrane electropermeabilization with arbitrary pulse waveforms.
xposure of a biological cell to an electric field can produce a variety of responses [1]-[6]. If the field strength exceeds a certain threshold value, this leads to a large transient increase in membrane conductivity and permeability for ions and molecules (electropermeabilization, often also named electroporation) or to fusion of adjacent cells (electrofusion) [5], [6]. Nowadays, these phenome...
متن کاملChanges in Doppler flow velocity waveforms and fetal size at 20 weeks gestation among cigarette smokers.
OBJECTIVES To compare umbilical and uterine artery Doppler waveforms and fetal size at 20 weeks between smokers and nonsmokers. DESIGN Prospective cohort study. SETTING Auckland, New Zealand and Adelaide, Australia. POPULATION Nulliparous participants in the Screening for Pregnancy Endpoints (SCOPE) study. METHODS Self-reported smoking status was determined at 15 +/- 1 weeks' gestation....
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ژورنال
عنوان ژورنال: Anaesthesia
سال: 2001
ISSN: 0003-2409
DOI: 10.1046/j.1365-2044.2001.01987.x