Read by QxMD icon Read

pulse wave analysis

G P Chuiko, O V Dvornik, S I Shyian, Ye A Baganov
BACKGROUND: A new computer model for systolic pulse waves within the cardiovascular system is presented. The emphasis was made on blood stroke volume (BS). The new waveform for pulse wave demands the re-computing of the BS. The authors showed the applicability of suggested model for arterial aging problem. METHODS: Suggested model is based on the well-known Korteweg-de Vries (KdV) equation. Instead of the common accepted solitary wave, the periodical cnoidal wave is used...
October 14, 2016: Computers in Biology and Medicine
Pavol Sajgalik, Vaclav Kremen, Alex R Carlson, Vratislav Fabian, Chul-Ho Kim, Courtney M Wheatley, Vaclav Gerla, John A Schirger, Thomas P Olson, Bruce D Johnson
Cardiac output (CO) assessment as a basic hemodynamic parameter has been of interest in exercise physiology, cardiology and anesthesiology. Non-invasive techniques available are technically challenging, and thus difficult to use outside of the clinical or laboratory setting. We propose a novel method of non-invasive CO assessment using a single upper arm cuff. The method uses the arterial pressure pulse wave signal acquired from the brachial artery during 20 second intervals of suprasystolic occlusion. This method was evaluated on a cohort of 12 healthy individuals (age of 27...
October 20, 2016: Journal of Applied Physiology
Matthias Hansen
Advanced hemodynamic monitoring is necessary for adequate management of high-risk patients or patients with derangement of circulation. Studies demonstrate a benefit of early goal directed therapy in unstable cardiopulmonary situations. In these days we have different possibilities of minimally invasive or invasive hemodynamic monitoring. Minimally invasive measurements like pulse conture analysis or pulse wave analysis being less accurate under some circumstances, however only an artery catheter is needed for cardiac output monitoring...
October 2016: Anästhesiologie, Intensivmedizin, Notfallmedizin, Schmerztherapie: AINS
Olga Trojnarska, Ludwina Szczepaniak-Chicheł, Marcin Gabriel, Agnieszka Bartczak-Rutkowska, Joanna Rupa-Matysek, Andrzej Tykarski, Stefan Grajek
BACKGROUND: Mortality in cyanotic patients with congenital heart diseases (CHD) is high, mainly due to cardiovascular complications. It is known that endothelial dysfunction, increased arterial stiffness, and impaired vascular function have negative influence on cardiovascular prognosis. The aim of the study was to assess parameters of arterial stiffness and vascular dysfunction in cyanotic patients with CHD as well as their potential relation to impaired blood oxygen saturation and polycythemia parameters typical for cyanosis...
October 15, 2016: Journal of Cardiology
Sophie Grand'Maison, Louise Pilote, Marisa Okano, Tara Landry, Natalie Dayan
Women with prior hypertensive disorders of pregnancy (HDP) are at twice the risk of cardiovascular disease compared with women with prior normotensive pregnancy, possibly because of sustained vascular dysfunction after delivery. The aim of this systematic review and meta-analysis is to summarize evidence of vascular dysfunction at least 3 months after HDP. Articles in all languages were retrieved from principal databases. Studies included were observational, with HDP as the main exposure and measurements of vascular dysfunction via imaging modalities or serum biomarkers as the main outcome, assessed at least 3 months postpartum...
October 17, 2016: Hypertension
Svetlana Villevalde, Zhanna Kovbalava
OBJECTIVE: Microalbuminuria (MAU) and glomerular filtration rate (GFR) are the signs of subclinical kidney damage, independently predict cardiovascular morbidity and mortality. The aim of the study was to investigate the relative role of MAU, cardiac and vascular ultrasonography, carotid-femoral pulse wave velocity (PWV) for the detection of hypertensive target organ damage (TOD) and risk stratification. DESIGN AND METHOD: In 576 non-diabetic hypertensive patients without established cardiovascular or renal disease (291 male, 53...
September 2016: Journal of Hypertension
Junichiro Hashimoto
Arterial structure and function change progressively with advancing age. Owing to long-lasting repetitive stretch with intermittent cardiac contraction, elastic fibers in the tunica media of large arteries gradually degenerate and are replaced by collagenous fibers. Such medial degeneration causes elastic arteries to stiffen and dilate. However, the speed of the vascular aging varies considerably among individuals; a discrepancy often exists between the chronological age of an individual and the biological age of his or her arteries...
September 2016: Journal of Hypertension
Jong-Chan Youn, Hee Tae Yu, Hyeon Chang Kim, Suk-Won Choi, Seong-Woo Han, Kyu-Hyung Ryu, Eui-Cheol Shin, Sungha Park
OBJECTIVE: Chronic kidney disease (CKD) is associated with increased arterial stiffness, which is a well-known predictor of future cardiovascular events. However, the underlying mechanism of arterial stiffening in CKD is not well known. Accelerated immune aging, characterized by expansion of immunosenescent T cell fraction might be involved in the pathogenesis of arterial stiffening in CKD. We aimed to evaluate the relationship between arterial stiffness and immunosenescent T cell (CD8CD57 or CD8CD28 T cell) fraction in patients with CKD...
September 2016: Journal of Hypertension
Akio Ishida, Yoshino Kinjo, Yuichiro Toma, Kozen Kinjo, Kunitoshi Iseki, Yusuke Ohya
OBJECTIVE: We reported that ankle-brachial index (ABI) was lowest at <40 years, and increased with age until 60 years and decreased thereafter in a screened cohort of Japanese general population. We hypothesized that this increase in ABI with age occurs owing to increasing arterial stiffness and wave reflection, and therefore, a high normal ABI is associated with target organ damage. DESIGN AND METHOD: We measured ABI and brachial-ankle pulse wave velocity (baPWV) by an automatic oscillometric method...
September 2016: Journal of Hypertension
Yi Zhang, Yuyan Lu, Bin Bai, Shikai Yu, Jing Xiong, Dela Jia, Yawei Xu
OBJECTIVE: To compare of carotid-femoral pulse wave velocity (cf-PWV) and brachial-ankle PWV (ba-PWV) in the association with conventional cardiovascular risk factors and target organ damages (TODs). DESIGN AND METHOD: 1599 community-dwelling elderly subjects (age > 65 years old) in the northern Shanghai were recruited from June 2014 to August 2015. Cf-PWV and ba-PWV were measured by SphygmCor (AtCor, Australia) and VP1000 (Omron, Japan), respectively. Under the framework of comprehensive cardiovascular examinations, cardiovascular risk factors were assessed, and hypertensive TODs, including left ventricular mass index (LVMI), peak transmitral pulsed Doppler velocity/early diastolic tissue Doppler velocity (E/Ea), carotid intima-media thickness (CIMT), ankle-brachial index (ABI), creatinine clearance rate (CCR) and urinary albumin-creatinine ratio (UACR), were all evaluated...
September 2016: Journal of Hypertension
Yuki Imaizumi, Kazuo Eguchi, Toshiki Kaihara, Kumiko Urano, Rieko Shinagawa, Minoru Araki, Koji Inoue, Koichiro Hokao, Yuka Tsujita, Takuya Furusawa, Ryuichiro Kaku, Kazuomi Kario
OBJECTIVE: We tested the hypothesis that sarcopenia, an age-related loss of skeletal muscle mass and function, is associated with arterial stiffness in patients with diabetes (DM). DESIGN AND METHOD: We studied 65 hypertensives in the Real BP study, an observational study of home BP telemonitoring system. As parameters of sarcopenia, we used locomotive syndrome scale, circumference of the wrist, lower leg, and thigh (10 cm above the patella), grip strength, and 6 minute-walk test...
September 2016: Journal of Hypertension
Audrey Adji, Thomas Weber, Caroline O'Brien, Michael O'Rourke, Alberto Avolio
OBJECTIVE: Relative ease of estimating of Ascending Aortic (AA) pressure non-invasively enables interpretation of age-related pressure waveform changes due to altered pulse wave propagation. AA flow velocity waveforms, measured invasively by ElectroMagnetic (EM) cuff/ catheter, and non-invasively by Cardiac Magnetic Resonance (CMR) also show characteristic aging changes attributable to aortic dilation and subtle impairment of Left Ventricular (LV) function. Conventional Doppler waveforms do not...
September 2016: Journal of Hypertension
Toshihiro Shoji, Sho Okada, Yuji Ohno, Atsushi Nakagomi, Yoshihide Fujimoto, Yosihio Kobayashi
OBJECTIVE: Pulse wave velocity is a non-invasive method that is useful not only for estimating arterial stiffness but also screening cardiovascular events in the general population. Upstroke time (UT) and % mean artery pressure (% MAP) are novel, adjunctive indices for arterial stiffness that are derived from morphology analysis of the pulse wave during brachial-ankle pulse wave velocity (baPWV) measurement. Several studies have shown the association between UT and coronary artery calcification score as assessed by multi-detector computed tomography (MDCT)...
September 2016: Journal of Hypertension
Ruan Kruger, Moliehi Mothae, Wayne Smith
OBJECTIVE: Cigarette smoking weakens the antioxidant defence system and is considered a lifestyle risk factor contributing to cardiovascular disease progression. Little information exists on these links in non-smoking versus smoking populations. We aimed to explore the associations of oxidative stress with markers of vascular function in a young, normotensive bi-ethnic population. DESIGN AND METHOD: We included 237 non-smokers (108 black and 129 white) and 145 smokers (78 black and 67 white) from South Africa between ages 20 and 30 years...
September 2016: Journal of Hypertension
Jianjun Mu, Chao Chu, Dan Wang, Tongshuai Guo, Yang Wang, Fan Yang
OBJECTIVE: To explore the relationship between childhood risk factors and long-term arterial stiffness. DESIGN AND METHOD: A baseline survey was carried out in 4623 school children aged 6-15 years in rural areas of Hanzhong city, Shaanxi in 1987. According to three measurements of systolic blood pressure (SBP) in 1987,1989 and 1992, high blood pressure group (HBP group) was defined as SBP ≥ 75 percentile at same age and gender, with SBP < 50 percentile as normal blood pressure group (NBP group)...
September 2016: Journal of Hypertension
Do Young Kim, Suk-Won Choi, Seong Woo Han, Jong-Chan Youn, Kyu-Hyung Ryu
OBJECTIVE: Neutrophil to lymphocyte ratio (NLR) is a marker of systemic inflammation and predictive of cardiovascular risk. We aimed to determine the relationship between NLR and blood pressure (BP) parameters. DESIGN AND METHOD: We reviewed data of 670 hypertensive subjects without cardiovascular diseases from the Korean registry of target organ damages in hypertension (KorHR) which were available from March 2013 to February 2016. Among these patients, 202 subjects (aged 45...
September 2016: Journal of Hypertension
Bin Bai, Jin Xiong, Yuyan Lv, Shikai Yu, Jiadela Teliewubai, Chen Chi, Yiwu Zhou, Kai Wang, Le Wang, Yi Zhang, Yawei Xu
OBJECTIVE: To investigate the discrepancy between PWV and PPA in association with hypertensive TODs in the elderly population. DESIGN AND METHOD: From June 2014 to August 2015, a total of 1599 community-based elderly subjects (age > 65 years old) located in the northern Shanghai were recruited. The carotid-femoral pulse wave velocity (cfPWV), peripheral blood pressure (BP), central BP and other TODs indicators including the ratio of the early ventricular filling velocity (E) to the peak velocity of tissue Doppler velocity of septal mitral annulus (E/Ea), left ventricular mass index (LVMI), carotid intima-medium thickness (IMT), estimated glomerular filtration rate (eGFR), urinary albumin-creatinine rate (ACR) were assessed on each participant...
September 2016: Journal of Hypertension
Koushik Viswanathan, Narayan K Sundaram, Srinivasan Chandrasekar
Stick-slip in sliding of soft adhesive surfaces has long been associated with the propagation of Schallamach waves, a type of slow surface wave. Recently it was demonstrated using in situ experiments that two other kinds of slow waves-separation pulses and slip pulses-also mediate stick-slip (Viswanathan et al., Soft Matter, 2016, 12, 5265-5275). While separation pulses, like Schallamach waves, involve local interface detachment, slip pulses are moving stress fronts with no detachment. Here, we present a theoretical analysis of the propagation of these three waves in a linear elastodynamics framework...
October 17, 2016: Soft Matter
MiHye Park, Sangbin Han, Gaab Soo Kim, Mi Sook Gwak
BACKGROUND: Intrapulmonary thermodilution technique using a pulmonary artery catheter is widely used for measuring cardiac output (CO) in patients undergoing liver transplantation. However, its invasiveness and associated complications have led to an interest in less invasive modalities. Thus, we aimed to evaluate whether the new calibrated pulse-wave analysis method monitoring (VolumeViewTM/EV1000TM) is interchangeable with intrapulmonary thermodilution technique. METHODS: Twenty-eight patients undergoing living donor liver transplantation were enrolled in this prospective observational study...
2016: PloS One
Lin Ren, Weibing She, Qingyu Gao, Changwei Pan, Chen Ji, Irving R Epstein
Crawling motion mediated by retrograde and direct waves, that is, in the opposite or the same direction, respectively, as the muscular wave that generates it, is a fundamental mode of biological locomotion, from which more complex and sophisticated locomotion modes involving outgrowths such as limbs and wings may have evolved. A detailed general description of muscular wave locomotion and its relationship with other modes of locomotion is a challenging task. We employ a model of a photosensitive self-oscillating gel, in which chemical pulse waves and a stimulus-responsive medium play roles analogous to nerve pulses and deformable muscles in an animal, to generate retrograde and direct waves under non-uniform illumination...
October 13, 2016: Angewandte Chemie
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"