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Arterial pulse transit time

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https://www.readbyqxmd.com/read/29770492/accelerated-3d-grase-imaging-improves-quantitative-multiple-post-labeling-delay-arterial-spin-labeling
#1
Markus Boland, Rüdiger Stirnberg, Eberhard D Pracht, Johanna Kramme, Roberto Viviani, Julia Stingl, Tony Stöcker
PURPOSE: To investigate the impact of accelerated, single-shot 3D-GRASE acquisition on quantitative arterial spin labeling (ASL) with multiple and single post-labeling delay (PLD) in terms of perfusion-weighted SNR per unit scan time (TSNRPW ) and quantification accuracy. METHODS: Five subjects were scanned on a 3T MRI scanner using the pseudo-continuous arterial spin labeling (PCASL) technique with a 3D-GRASE imaging sequence capable of parallel imaging acceleration...
May 16, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29710744/changes-in-the-bilateral-pulse-transit-time-difference-with-a-moving-arm
#2
Xinge Jiang, Shoushui Wei, Dingchang Zheng, Peng Huang, Chengyu Liu
BACKGROUND: Changes of pulse transit time (PTT) induced by arm position were studied for unilateral arm. However, consistency of the PTT changes was not validated for both arm sides. OBJECTIVE: We aimed to quantify the PTT changes between horizontal and non-horizontal positions from right arm and left arm in order to explore the consistency of both arms. METHODS: Twenty-four normal subjects aged between 21 and 50 (14 male and 10 female) years were enrolled...
April 20, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/29559196/doppler-echocardiography-assessment-of-aortic-stiffness-in-female-adolescents-with-anorexia-nervosa
#3
Carolina A Escudero, James E Potts, Pei-Yoong Lam, Astrid M De Souza, Gerald J Mugford, George G S Sandor
BACKGROUND: Anorexia nervosa (AN) is associated with abnormalities in biomarkers of cardiovascular risk. Arterial stiffness, as measured by pulse-wave velocity (PWV), is also a risk factor for cardiovascular disease. The aims of this study were to determine the stiffness of the aorta in female adolescents with AN and to determine if either the severity or the type of AN was associated with PWV. METHODS: This was a retrospective case-control study. Adolescent patients with a clinical diagnosis of AN were included...
March 17, 2018: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/29522038/large-scale-clinical-validation-of-noncontact-and-continuous-extraction-of-blood-pressure-via-multipoint-defocused-photonic-imaging
#4
Mark Golberg, Joaquin Ruiz-Rivas, Sagi Polani, Yevgeny Beiderman, Zeev Zalevsky
Blood pressure (BP) is usually measured either invasively, by an intra-arterial catheter, or noninvasively, by a cuff-based sphygmomanometer. While the invasive method is continuous and more accurate, it has the risk of infection and generally is not comfortable for the patient. On the other hand, the cuff-based measurement is safer but less reliable and infrequent. Therefore, a reliable continuous noninvasive BP measurement is highly desirable. In this work, we propose a remote optical system, based on temporal analysis of secondary reflected speckle patterns, for computing a subject's pulse transit time (PTT)...
March 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29465201/-pulse-wave-transit-time-one-more-attempt-of-non-invasive-cardiac-output-measurement
#5
RANDOMIZED CONTROLLED TRIAL
B A Akselrod, L A Tolstova, T A Pshenichniy, S V Fedulova
BACKGROUND: Estimated continuous cardiac output (esCCOTM) based on pulse wave transit time is one of alternative non-invasive CO measurement techniques. METHODS: Randomized study included 23 scheduled patients operated upon due to cardiovascular diseases. Cardiac index (CI) was measured Comparative analyses of esCCO and others CO measurement methods used intraoperative was carried out. In the first group (n = 9) esCCO was compared with transpulmonary thermodilution (PiCCO-plus); in the second group (n = 8) - with pulmonary artery thermodilution; in the third group (n = 6) - with transoesophageal echocardiography (velocity-time integral)...
September 2017: Anesteziologiia i Reanimatologiia
https://www.readbyqxmd.com/read/29447849/three-dimensional-arterial-spin-labeling-imaging-with-a-dante-preparation-pulse
#6
Tsuyoshi Matsuda, Hirohiko Kimura, Hiroyuki Kabasawa, Masayuki Kanamoto
On arterial spin-labeled (ASL) images, areas of bright intravascular signal will appear when the post labeling delay time is shorter than arterial transit time. Vascular suppression (VS) schemes reduce artefactual bright signal by dephasing intravascular labeled spins. However, existing VS methods, such as Motion-Sensitized Driven-Equilibrium (MSDE), decrease the uniformity of the signal intensity distribution and extend the echo time. The purpose of this study is to compare VS using a Delays Alternating with Nutation for Tailored Excitation (DANTE) preparation pulse, with MSDE for ASL imaging on a flow phantom and volunteer data...
June 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29445936/pulmonary-arterial-hemodynamic-assessment-by-a-novel-index-in-systemic-sclerosis-patients-pulmonary-pulse-transit-time
#7
Mehmet Dogan, Tolga Han Efe, Tolga Cimen, Cem Ozisler, Mehmet Ali Felekoglu, Ahmet Goktug Ertem, Mehmet Erat, Omer Yiginer, Murat Tulmac
OBJECTIVES: Systemic sclerosis (SSc) is a chronic, inflammatory, and autoimmune connective tissue disease that is associated with vascular lesions, and fibrosis of the skin and visceral organs. Cardiac complications may occur as a secondary effect of SSc as a result of pulmonary arterial hypertension and interstitial lung disease. The objective of this study was to assess whether the pulmonary pulse transit time (pPTT) could serve as a diagnostic marker for pulmonary arterial alterations in patients with SSc, prior to development of pulmonary hypertension...
April 2018: Lung
https://www.readbyqxmd.com/read/29311630/increased-pulse-wave-transit-time-after-percutaneous-coronary-intervention-procedure-in-cad-patients
#8
Lizhen Ji, Chengyu Liu, Peng Li, Xinpei Wang, Changchun Liu, Yinglong Hou
Pulse wave transit time (PWTT) has been widely used as an index in assessing arterial stiffness. Percutaneous coronary intervention (PCI) is usually applied to the treatment of coronary artery disease (CAD). Research on the changes in PWTT caused by PCI is helpful for understanding the impact of the PCI procedure. In addition, effects of stent sites and access sites on the changes in PWTT have not been explored. Consequently, this study aimed to provide this information. The results showed that PWTT significantly increased after PCI (p < 0...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29124548/development-of-an-experimental-and-digital-cardiovascular-arterial-model-for-transient-hemodynamic-and-postural-change-studies-a-preliminary-framework-analysis
#9
Rodward L Hewlin, John P Kizito
The ultimate goal of the present work is to aid in the development of tools to assist in the treatment of cardiovascular disease. Gaining an understanding of hemodynamic parameters for medical implants allow clinicians to have some patient-specific proposals for intervention planning. In the present work an experimental and digital computational fluid dynamics (CFD) arterial model consisting of a number of major arteries (aorta, carotid bifurcation, cranial, femoral, jejunal, and subclavian arteries) were fabricated to study: (1) the effects of local hemodynamics (flow parameters) on global hemodynamics (2) the effects of transition from bedrest to upright position (postural change) on hemodynamics, and (3) diffusion of dye (medical drug diffusion simulation) in the arterial system via experimental and numerical techniques...
March 2018: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/29060665/robust-motion-artefact-resistant-circuit-for-calculation-of-mean-arterial-pressure-from-pulse-transit-time
#10
Tinish Bhattacharya, Ankesh Gupta, Salam ThoiThoi Singh, Sitikantha Roy, Anamika Prasad
Cuff-less and non-invasive methods of Blood Pressure (BP) monitoring have faced a lot of challenges like stability, noise, motion artefact and requirement for calibration. These factors are the major reasons why such devices do not get approval from the medical community easily. One such method is calculating Blood Pressure indirectly from pulse transit time (PTT) obtained from electrocardiogram (ECG) and Photoplethysmogram (PPG). In this paper we have proposed two novel analog signal conditioning circuits for ECG and PPG that increase stability, remove motion artefacts, remove the sinusoidal wavering of the ECG baseline due to respiration and provide consistent digital pulses corresponding to blood pulses/heart-beat...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060346/coherence-analysis-of-invasive-blood-pressure-and-its-noninvasive-indicators-for-improvement-of-cuffless-measurement-accuracy
#11
Xiao-Rong Ding, Bryan P Yan, Yuan-Ting Zhang, Jing Liu, Peng Su, Ni Zhao
Cuffless technology for blood pressure (BP) measurement offers great potential for unobtrusive monitoring of hypertension. However, the accuracy is still a challenging issue probably owning to the inadequacy of existing noninvasive BP indicators in tracking BP changes, i.e., either the poor trackability of the indicators or the lack of relationship to map the indicators to BP. To figure out the covariation of BP-related noninvasive indicators and BP, we propose to analyze the coherence of intra-arterial systolic BP (SBP) and a selected group of noninvasive indicators, including the mostly used pulse transit time (PTT), photoplethysmogram intensity ratio (PIR) and RR interval (RRI) of electrocardiogram (ECG), in both time domain, with singular spectrum analysis (SSA), and frequency domain, with cross-spectral analysis...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060213/measurement-of-carotid-blood-pressure-and-local-pulse-wave-velocity-changes-during-cuff-induced-hyperemia
#12
P M Nabeel, Srinivasa Karthik, Jayaraj Joseph, Mohanasankar Sivaprakasam
We present a prototype design of dual element photoplethysmograph (PPG) probe along with associated measurement system for carotid local pulse wave velocity (PWV) evaluation in a non-invasive and continuous manner. The PPG probe consists of two identical sensing modules placed 23 mm apart. Simultaneously measured blood pulse waveforms from these arterial sites were processed and the pulse transit time delay was resolved using the developed application-specific software. The ability of developed PPG probe and associated measurement system to detect acute changes in carotid local PWV due to blood pressure (BP) variations was experimentally validated by an in-vivo study...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29058686/single-source-ppg-based-local-pulse-wave-velocity-measurement-a-potential-cuffless-blood-pressure-estimation-technique
#13
P M Nabeel, J Jayaraj, S Mohanasankar
OBJECTIVE: A novel photoplethysmograph probe employing dual photodiodes excited using a single infrared light source was developed for local pulse wave velocity (PWV) measurement. The potential use of the proposed system in cuffless blood pressure (BP) techniques was demonstrated. APPROACH: Initial validation measurements were performed on a phantom using a reference method. Further, an in vivo study was carried out in 35 volunteers (age  =  28  ±  4...
November 30, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/29029934/ability-of-pulse-wave-transit-time-to-detect-changes-in-stroke-volume-and-to-estimate-cardiac-output-compared-to-thermodilution-technique-in-isoflurane-anaesthetised-dogs
#14
H Sano, J P Chambers
OBJECTIVE: To evaluate the ability of pulse wave transit time (PWTT) to detect changes in stroke volume (SV) and to estimate cardiac output (CO) compared with the thermodilution technique in isoflurane-anaesthetized dogs. STUDY DESIGN: Prospective, experimental study. ANIMALS: Eight adult laboratory dogs. METHODS: The dogs were anaesthetized with isoflurane and mechanically ventilated. Reference CO (TDCO) was measured via a pulmonary artery catheter using the thermodilution technique and reference SV (TDSV) was calculated...
September 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/29024538/retinal-pulse-wave-velocity-measurement-using-spectral-domain-optical-coherence-tomography
#15
Qian Li, Lin Li, Shanhui Fan, Cuixia Dai, Xinyu Chai, Chuanqing Zhou
The human eyes provide a natural window for noninvasive measurement of the pulse wave velocity (PWV) of small arteries. By measuring the retinal PWV, the stiffness of small arteries can be assessed, which may better detect early vascular diseases. Therefore, retinal PWV measurement has attracted increasing attention. In this study, a jump-scanning method was proposed for non-invasive measurement of retinal PWV using spectral-domain OCT. The jump-scanning method uses the phase-resolved Doppler OCT to obtain the pulse shapes...
October 12, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28968226/numerical-assessment-and-comparison-of-pulse-wave-velocity-methods-aiming-at-measuring-aortic-stiffness
#16
Hasan Obeid, Gilles Soulat, Elie Mousseaux, Stéphane Laurent, Nikos Stergiopulos, Pierre Boutouyrie, Patrick Segers
Pulse waveform analyses have become established components of cardiovascular research. Recently several methods have been proposed as tools to measure aortic pulse wave velocity (aPWV). The carotid-femoral pulse wave velocity (cf-PWV), the current clinical gold standard method for the noninvasive assessment of aPWV, uses the carotid-to-femoral pulse transit time difference (cf-PTT) and an estimated path length to derive cf-PWV. OBJECTIVE: The heart-ankle PWV (ha-PWV), brachial-ankle PWV (ba-PWV) and finger-toe (ft-PWV) are also methods presuming to approximate aPWV based on time delays between physiological cardiovascular signals at two locations (~heart-ankle PTT, ha-PTT; ~brachial-ankle PTT, ba-PTT; ~finger-toe PTT, ft-PTT) and a path length typically derived from the subject's height...
October 31, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28880196/estimation-of-pulse-transit-time-from-radial-pressure-waveform-alone-by-artificial-neural-network
#17
Hanguang Xiao, Mark Butlin, Isabella Tan, Ahmad Qasem, Alberto Avolio
OBJECTIVE: To validate the feasibility of the estimation of pulse transit time (PTT) by artificial neural network (ANN) from radial pressure waveform alone. METHODS: A cascade ANN with ten-fold cross validation was applied to invasively and simultaneously recorded aortic and radial pressure waveforms during rest and nitroglycerin infusion (n=62) for the estimation of mean and beat-to-beat PTT. The results of the ANN models were compared to a multiple linear regression (LR) model when the features of radial arterial pressure waveform in time and frequency domains were used as the predictors of the models...
September 1, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28866598/a-magnetic-plethysmograph-probe-for-local-pulse-wave-velocity-measurement
#18
Nabeel P M, Jayaraj Joseph, Mohanasankar Sivaprakasam
OBJECTIVE: We present the design and experimental validation of an arterial compliance probe with dual magnetic plethysmograph (MPG) transducers for local pulse wave velocity (PWV) measurement. The MPG transducers (positioned at 23 mm distance apart) utilizes Hall-effect sensors and permanent magnets for arterial blood pulse detection. METHODS: The MPG probe was initially validated on an arterial flow phantom using a reference method. Further, 20 normotensive subjects (14 males, age = 24 ± 3...
October 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28831258/which-psychological-psychophysiological-and-anthropometric-factors-are-connected-with-life-events-depression-and-quality-of-life-in-patients-with-cardiovascular-disease
#19
Milos Slepecky, Antonia Kotianova, Jan Prasko, Ivan Majercak, Erika Gyorgyova, Michal Kotian, Marta Zatkova, Marta Popelkova, Marie Ociskova, Ingrid Tonhajzerova
OBJECTIVE: The aim of the study was to determine psychological, psychophysiological, and anthropometric factors connected with life events, level of depression, and quality of life in people at risk for cardiovascular disease and healthy controls. METHODS: This is a cross-sectional study involving arterial hypertension patients and healthy controls. There were several measurements including physical, anthropological, cardiovascular, and psychophysiological measurements and administration of questionnaires...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28828627/nocturnal-blood-pressure-fluctuations-measured-by-using-pulse-transit-time-in-patients-with-severe-obstructive-sleep-apnea-syndrome
#20
Jennifer Gehring, Heiko Gesche, Gesine Drewniok, Gert Küchler, Andreas Patzak
BACKGROUND: Obstructive sleep apnea syndrome (OSAS) is related to arterial hypertension. In the present study, we test the hypothesis that patients with severe OSAS have excessive apnea induced blood pressure (BP). METHODS: We investigated 97 patients with an apnea/hypopnea index (AHI) greater than 30. Systolic BP (SBP) was continuously determined by using the pulse transit time (PTT). Apnea/hypopnea induced nocturnal BP fluctuations (NBPFs) were detected and showed phenomena of continuous increases of the SBP baseline...
May 2018: Sleep & Breathing, Schlaf & Atmung
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