نتایج جستجو برای: pressure waveforms

تعداد نتایج: 417137  

2008
Robert G. Turcott Todd J. Pavek

Turcott RG, Pavek TJ. Hemodynamic sensing using subcutaneous photoplethysmography. Am J Physiol Heart Circ Physiol 295: H2560 –H2572, 2008. First published October 10, 2008; doi:10.1152/ajpheart.00574.2008.—Pacemakers and implantable defibrillators presently operate without access to hemodynamic information. If available, such data would allow tailoring of delivered therapy according to perfusi...

Journal: :Hypertension 2011
Darren P Casey Timothy B Curry Michael J Joyner Nisha Charkoudian Emma C Hart

Increased arterial stiffness is associated with higher levels of aortic wave reflection and aortic blood pressure. Recent evidence suggests a link between muscle sympathetic nerve activity and indices of arterial stiffness. Therefore, the aims of this study were to examine the relationship between resting muscle sympathetic nerve activity and characteristics of aortic pressure wave reflection a...

Journal: :American journal of physiology. Heart and circulatory physiology 2011
Philippe Reymond Yvette Bohraus Fabienne Perren Francois Lazeyras Nikos Stergiopulos

The aim of this study is to develop and validate a patient-specific distributed model of the systemic arterial tree. This model is built using geometric and hemodynamic data measured on a specific person and validated with noninvasive measurements of flow and pressure on the same person, providing thus a patient-specific model and validation. The systemic arterial tree geometry was obtained fro...

Journal: :Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology 1999
J A Laudy N T Ursem P G Mulder J W Wladimiroff

OBJECTIVES To describe the nature of flow velocity waveforms from fetal middle and distal venous pulmonary branches in the second half of normal pregnancy in relation to gestation, and to test repeatability and interrelationships of flow velocity waveform recordings from proximal, middle and distal venous pulmonary branches. DESIGN Cross-sectional study. SUBJECTS/METHODS A total of 111 norm...

Journal: :Hypertension 2015
Junichiro Hashimoto Sadayoshi Ito

Aortic stiffness determines the glomerular filtration rate (GFR) and predicts the progressive decline of the GFR. However, the underlying pathophysiological mechanism remains obscure. Recent evidence has shown a close link between aortic stiffness and the bidirectional (systolic forward and early diastolic reverse) flow characteristics. We hypothesized that the aortic stiffening-induced renal d...

2012
W Li A Ahn

Purpose Pulse pressure waveforms can be decomposed into individual harmonics using frequency-domain analyses. Based on the well-recognized phenomenon of pulse wave reflections, these harmonics are purported to play important physiological functions and form the basis for Traditional Chinese Medicine (TCM) pulse diagnosis. Although breathing is considered an essential part of TCM and Qi Gong, it...

Journal: :American journal of hypertension 2012
Hao-Min Cheng Shih-Hsien Sung Yuan-Ta Shih Shao-Yuan Chuang Wen-Chung Yu Chen-Huan Chen

BACKGROUND The prognostic value of central aortic pulse pressure (PP-C) may have been underestimated due to its measurement inaccuracy. We aimed to investigate the accuracy of noninvasive brachial cuff-based estimation of PP-C by a generalized transfer function (GTF) or a novel pulse wave analysis (PWA) approach to directly estimate PP-C. METHODS Invasive high-fidelity right brachial and cent...

Journal: :Open Journal of Preventive Medicine 2023

Background: Lower extremity Peripheral artery disease (PAD) is caused by atherosclerosis, or Plaque buildup, that reduces the blood flow to legs and feet. PAD affects approximately 230 million adults worldwide associated with an increased risk of coronary heart disease, stroke, leg amputation. The first-line method for diagnosis Ankle Brachial Index (ABI), which ratio ankle brachial higher syst...

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