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Arterial pulse transit time

Sven Haller, Greg Zaharchuk, David L Thomas, Karl-Olof Lovblad, Frederik Barkhof, Xavier Golay
Arterial spin labeling (ASL) is a magnetic resonance (MR) imaging technique used to assess cerebral blood flow noninvasively by magnetically labeling inflowing blood. In this article, the main labeling techniques, notably pulsed and pseudocontinuous ASL, as well as emerging clinical applications will be reviewed. In dementia, the pattern of hypoperfusion on ASL images closely matches the established patterns of hypometabolism on fluorine 18 fluorodeoxyglucose (FDG) positron emission tomography (PET) images due to the close coupling of perfusion and metabolism in the brain...
November 2016: Radiology
Grzegorz Styczynski, Adam Rdzanek, Arkadiusz Pietrasik, Janusz Kochman, Zenon Huczek, Piotr Sobieraj, Zbigniew Gaciong, Cezary Szmigielski
BACKGROUND: Aortic pulse-wave velocity (PWV) is a measure of aortic stiffness that has a prognostic role in various diseases and in the general population. A number of methods are used to measure PWV, including Doppler ultrasound. Although echocardiography has been used for PWV measurement, to the authors' knowledge, it has never been tested against an invasive reference method at the same time point. Therefore, the aim of this study was to compare prospectively an echocardiographic PWV measurement, called echo-PWV, with an invasive study...
September 7, 2016: Journal of the American Society of Echocardiography
H Khettab, D Campo, R Yu, N Buard, P Boutouyrie
OBJECTIVE: Measurement of arterial stiffness (AS) is still hampered by the technical skill necessary to obtain reliable measurements. It is generally considered that AS is not prone to self-measurement. We developed a non-invasive technique to assess AS from a connected bathroom scale, based on ballistocardiography (BCG) and impedance plethysmography (IPG).(Figure is included in full-text article.) DESIGN AND METHOD: :: We included 76 healthy subjects and 35 essential hypertensive, 50% women...
September 2016: Journal of Hypertension
L Marais, M Pernot, H Khettab, M Tanter, E Messas, M Zidi, S Laurent, P Boutouyrie
OBJECTIVE: The question whether arterial stiffness in hypertension is increased solely because of increased arterial pressure is not solved. Because measurement of arterial stiffness is highly dependent on measurement of blood pressure (BP), the development of methods independent of BP is necessary for clarifying this question. Ultrafast echography (UFE, Supersonic Imagine, Aix en Provence, France) makes use of very fast sampling rate (up to 10 kHz), so transient events such as pressure wave arrival can be tracked...
September 2016: Journal of Hypertension
Jun Sugawara, Koichiro Hayashi, Hirofumi Tanaka
BACKGROUND: Carotid-femoral pulse wave velocity (cfPWV) is the most established measure of central arterial stiffness and is calculated by dividing the distance travelled by the pulse wave by the pulse transit time. However, there is no universally accepted standardized measurement of pulse travel distance for cfPWV. This study sought to assess validity and convertibility of 2 most frequently used travel distance estimations, and create the simple and useful conversion equation to unify cfPWV values obtained with different methodologies for pulse travel distance...
August 5, 2016: American Journal of Hypertension
Seddigheh Baktash, Mohamad Forouzanfar, Izmail Batkin, Miodrag Bolic, Voicu Groza, Saif Ahmad, Hilmi Dajani
Non-invasive blood pressure (BP) measurement is an important tool for managing hypertension and cardiovascular disease. However, automated non-invasive BP measurement devices, which are usually based on the oscillometric method, do not always provide accurate estimation of BP. It has been found that change in arterial stiffness (AS) is an underlying mechanism of disagreement between an oscillometric BP monitor and a sphygmomanometer. This problem is addressed by incorporating parameters related to AS in the algorithm for BP measurement...
July 27, 2016: IEEE Journal of Biomedical and Health Informatics
Karolina Dorniak, Einar Heiberg, Marcin Hellmann, Dorota Rawicz-Zegrzda, Maria Wesierska, Rafal Galaska, Agnieszka Sabisz, Edyta Szurowska, Maria Dudziak, Erik Hedström
BACKGROUND: Pulse wave velocity (PWV) is a biomarker for arterial stiffness, clinically assessed by applanation tonometry (AT). Increased use of phase-contrast cardiac magnetic resonance (CMR) imaging allows for PWV assessment with minor routine protocol additions. The aims were to investigate the acquired temporal resolution needed for accurate and precise measurements of CMR-PWV, and develop a tool for CMR-PWV measurements. METHODS: Computer phantoms were generated for PWV = 2-20 m/s based on human CMR-PWV data...
2016: BMC Cardiovascular Disorders
Dilpreet Buxi, Jean-Michel Redoute, Mehmet Rasit Yuce
OBJECTIVE: We have developed and tested a new architecture for pulse transit time (PTT) estimation at the central arteries using electrical bioimpedance, electrocardiogram and continuous wave radar to estimate cuffless blood pressure. METHODS: A transmitter and receiver antenna is placed at the sternum to acquire the arterial pulsation at the aortic arch. A four-electrode arrangement across the shoulders acquires arterial pulse across the carotid and subclavian arteries from bioimpedance as well as a bipolar lead I electrocardiogram...
June 20, 2016: IEEE Transactions on Bio-medical Engineering
Tetsuya Tsujikawa, Hirohiko Kimura, Tsuyoshi Matsuda, Yasuhiro Fujiwara, Makoto Isozaki, Ken-Ichiro Kikuta, Hidehiko Okazawa
Arterial transit time (ATT) is most crucial for measuring absolute cerebral blood flow (CBF) by arterial spin labeling (ASL), a noninvasive magnetic resonance (MR) perfusion assessment technique, in patients with chronic occlusive cerebrovascular disease. We validated ASL-CBF and ASL-ATT maps calculated by pulsed continuous ASL (pCASL) with multiple post-label delay acquisitions in patients with occlusive cerebrovascular disease. Fifteen patients underwent MR scans, including pCASL, and positron emission tomography (PET) scans with 15O-water to obtain PET-CBF...
2016: PloS One
Mingwu Gao, N Bari Olivier, Ramakrishna Mukkamala
Pulse transit time (PTT) measured as the time delay between invasive proximal and distal blood pressure (BP) or flow waveforms (invasive PTT [I-PTT]) tightly correlates with BP PTT estimated as the time delay between noninvasive proximal and distal arterial waveforms could therefore permit cuff-less BP monitoring. A popular noninvasive PTT estimate for this application is the time delay between ECG and photoplethysmography (PPG) waveforms (pulse arrival time [PAT]). Another estimate is the time delay between proximal and distal PPG waveforms (PPG-PTT)...
May 2016: Physiological Reports
Hamid Gholamhosseini, Andries Meintjes, Mirza Baig, Maria Linden
The increasing availability of low cost and easy to use personalized medical monitoring devices has opened the door for new and innovative methods of health monitoring to emerge. Cuff-less and continuous methods of measuring blood pressure are particularly attractive as blood pressure is one of the most important measurements of long term cardiovascular health. Current methods of noninvasive blood pressure measurement are based on inflation and deflation of a cuff with some effects on arteries where blood pressure is being measured...
2016: Studies in Health Technology and Informatics
Hassan A Chami, Ramachandran S Vasan, Martin G Larson, Emelia J Benjamin, Gary F Mitchell, Daniel J Gottlieb
OBJECTIVE: Sleep-disordered breathing is associated with hypertension and cardiovascular disease. Increased aortic stiffness is one possible linking mechanism. We evaluated the association between sleep-disordered breathing and aortic stiffness in a community-based sample. METHODS: Our community-based cross-sectional observational study included 381 participants from the Framingham Heart Study (55% women, mean age 58.0 S.D. = 9.4 years, 51% ethnic minorities)...
March 2016: Sleep Medicine
Young-Boum Lee, Sang-Wuk Jeong, Moo-Yong Rhee, Chae-Hun Leem
No abstract text is available yet for this article.
May 10, 2016: International Journal of Cardiology
Kazuhiro Shimizu, Nobuyuki Kosaka, Yasuhiro Fujiwara, Tsuyoshi Matsuda, Tatsuya Yamamoto, Tatsuro Tsuchida, Katsuki Tsuchiyama, Nobuyuki Oyama, Hirohiko Kimura
PURPOSE: The importance of arterial transit time (ATT) correction for arterial spin labeling MRI has been well debated in neuroimaging, but it has not been well evaluated in renal imaging. The purpose of this study was to evaluate the feasibility of pulsed continuous arterial spin labeling (pcASL) MRI with multiple post-labeling delay (PLD) acquisition for measuring ATT-corrected renal blood flow (ATC-RBF). MATERIALS AND METHODS: A total of 14 volunteers were categorized into younger (n = 8; mean age, 27...
May 9, 2016: Magnetic Resonance in Medical Sciences: MRMS
Stephen A Klassen, Daniele Chirico, Deborah D O'Leary, John Cairney, Terrance J Wade
Adverse childhood experiences (ACEs) have been linked with cardiovascular disease and early mortality among adults. Most research examines this relationship retrospectively. Examining the association between ACEs and children's cardiovascular health is required to understand the time course of this association. We examined the relationship between ACEs exposure and ECG-to-toe pulse wave velocity (PWV), a measure of systemic arterial stiffness that is strongly related to cardiovascular mortality among adults...
June 2016: Child Abuse & Neglect
Xian Fu, Chuming Huang, Ka Sing Wong, Xiangyan Chen, Qingchun Gao
AIM: Pulse wave velocity (PWV) has been regarded as the "gold standard" measurement of arterial stiffness (AS), but it is still only used in the assessment of central and peripheral arteries. We constructed a new method to evaluate cerebral AS by measuring PWV using transcranial Doppler (TCD). METHODS: In all, 90 healthy subjects who received annual health screening were consecutively enrolled in this study between January 2011 and June 2013. Data on clinical characteristics, brachium-ankle (ba) PWV, and carotid-cerebral (cc) PWV measured with our newly constructed method by two experienced operators were recorded...
August 1, 2016: Journal of Atherosclerosis and Thrombosis
Alexey A Smetkin, Ayyaz Hussain, Evgenia V Fot, Viktor I Zakharov, Natalia N Izotova, Angelika S Yudina, Zinaida A Dityateva, Yanina V Gromova, Vsevolod V Kuzkov, Lars J Bjertnæs, Mikhail Y Kirov
To evaluate the accuracy of estimated continuous cardiac output (esCCO) based on pulse wave transit time in comparison with cardiac output (CO) assessed by transpulmonary thermodilution (TPTD) in off-pump coronary artery bypass grafting (OPCAB). We calibrated the esCCO system with non-invasive (Part 1) and invasive (Part 2) blood pressure and compared with TPTD measurements. We performed parallel measurements of CO with both techniques and assessed the accuracy and precision of individual CO values and agreement of trends of changes perioperatively (Part 1) and postoperatively (Part 2)...
March 7, 2016: Journal of Clinical Monitoring and Computing
Michael F La Fountaine, Michita Toda, Anthony J Testa, Vicci Hill-Lombardi
The arterial pulse wave (APW) has a distinct morphology whose contours reflect dynamics in cardiac function and peripheral vascular tone as a result of sympathetic nervous system (SNS) control. With a transition from rest to increased metabolic demand, the expected augmentation of SNS outflow will not only affect arterial blood pressure and heart rate but it will also induce changes to the contours of the APW. Following a sports concussion, a transient state cardiovascular autonomic dysfunction is present. How this state affects the APW has yet to be described...
2016: Frontiers in Neurology
Georgios A Georgiopoulos, Irene Lambrinoudaki, Fani Athanasouli, Eleni Armeni, Demetrios Rizos, Maria Kazani, Marianna Karamanou, Efstathios Manios, Areti Augoulea, Konstantinos Stellos, Christos Papamichael, Kimon Stamatelopoulos
BACKGROUND AND AIMS: We aimed to assess the prognostic value of free androgen index (FAI) and its change over time in arterial stiffness progression, endothelial function and hypertension in postmenopausal women. METHODS: Postmenopausal women (n = 180) without clinically overt cardiovascular disease or diabetes were consecutively recruited and followed for a median of 29 months. The main outcome measures were changes over time in endothelial function (FMD), reflected waves, localized and systemic (PWV) arterial stiffness and hypertension...
April 2016: Atherosclerosis
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