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Pressure Wave

Dinani Matoso Filho Armstrong, Gautam Sikka, Anderson da Costa Armstrong, Karen Ruggeri Saad, William Rodrigues de Freitas, Dan Ezra Berkowitz, Djalma José Fagundes, Lakshmi Santhanam, Murched Omar Taha
PURPOSE: To determine whether the absence of transglutaminase 2 enzyme (TG2) in TG2 knockout mice (TG2-/-) protect them against early age-related functional and histological arterial changes. METHODS: Pulse wave velocity (PWV) was measured using non-invasive Doppler and mean arterial pressure (MAP) was measured in awake mice using tail-cuff system. Thoracic aortas were excised for evaluation of endothelial dependent vasodilation (EDV) by wire myography, as well as histological analyses...
November 2018: Acta Cirúrgica Brasileira
Stella Stabouli, Euthymia Vargiami, Olga Maliachova, Nikoleta Printza, John Dotis, Maria Kyriazi, Konstantinos O Papazoglou, Dimitrios Zafeiriou
Arterial hypertension is a common finding in patients with neurofibromatosis (NF) type 1. Renovascular hypertension due to renal artery stenosis or midaortic syndrome could be the underlying cause. We report the case of a 4-year-old girl with NF type 1 and midaortic syndrome whose changes in blood pressure and pulse wave velocity suggested the evolution of vasculopathy, diagnosis of renovascular hypertension, and provided insights of response to treatment. Hypertension persisted after percutaneous transluminal angioplasty in the abdominal aorta, requiring escalation of antihypertensive treatment, while arterial stiffness demonstrated a mild decrease...
2018: Case Reports in Pediatrics
Zeng-Ding Liu, Ji-Kui Liu, Bo Wen, Qing-Yun He, Ye Li, Fen Miao
Pulse transit time (PTT) has received considerable attention for noninvasive cuffless blood pressure measurement. However, this approach is inconvenient to deploy in wearable devices because two sensors are required for collecting two-channel physiological signals, such as electrocardiogram and pulse wave signals. In this study, we investigated the pressure pulse wave (PPW) signals collected from one piezoelectric-induced sensor located at a single site for cuffless blood pressure estimation. Twenty-one features were extracted from PPW that collected from the radial artery, and then a linear regression method was used to develop blood pressure estimation models by using the extracted PPW features...
December 2, 2018: Sensors
Rita Ventura Matos, Filipa Ferreira, Carla Gil, José Saldanha Matos
Gas pollutants emitted during wastewater transport contribute to atmospheric pollution, aggravated risks for utility workers, infrastructure corrosion, and odour nuisance. Field studies have shown that is difficult to effectively obtain reliable correlations between in-sewer air movement and gas pollutant concentrations. This study aimed at investigating the influence of different ventilation and operating conditions in H2 S and CH4 horizontal and vertical movement in a section of a gravity sewer, downstream of a pumping station...
December 3, 2018: Environmental Science and Pollution Research International
Yunlong Huo, Huan Chen, Ghassan S Kassab
Background: The differential effects of rapid cardiac pacing on small and large vessels have not been well-established. The objective of this study was to investigate the effect of pacing-induced acute tachycardia on hemodynamics and arterial stiffness. Methods: The pressure and flow waves in ascending aorta and femoral artery of six domestic swine were recorded simultaneously at baseline and heart rates (HR) of 135 and 155 beats per minutes (bpm) and analyzed by the models of Windkessel and Womersley types...
2018: Frontiers in Physiology
Amy A Simon, Ricardo Hueso, Peio Iñurrigarro, Agustín Sánchez-Lavega, Raúl MoralesJuberías, Richard Cosentino, Leigh N Fletcher, Michael H Wong, Andrew I Hsu, Imke de Pater, Glenn S Orton, François Colas, Marc Delcroix, Damian Peach, Josep-María Gómez-Forrellad
Small-scale waves were observed along the boundary between Jupiter's North Equatorial Belt and North Tropical Zone, ~16.5° N planetographic latitude in Hubble Space Telescope data in 2012 and throughout 2015 to 2018, observable at all wavelengths from the UV to the near IR. At peak visibility, the waves have sufficient contrast (~10%) to be observed from ground-based telescopes. They have a typical wavelength of about 1.2° (1400 km), variable-length wave trains, and westward phase speeds of a few m/s or less...
August 2018: Astronomical Journal
Hsun Shuan Wang, Yajun Ruan, Lia Banie, Kai Cui, Ning Kang, Dongyi Peng, Tianshu Liu, Tianyu Wang, Bohan Wang, Guifang Wang, Alan W Shindel, Guiting Lin, Tom F Lue
BACKGROUND: Erectile dysfunction (ED) caused by pelvic neurovascular injury (PNVI) is often refractory to treatment. In many cases, erectogenic therapy is administered in a delayed fashion. AIM: To evaluate penile hemodynamic effects and histologic changes associated with delayed low-intensity extracorporeal shock wave therapy (Li-ESWT) after PNVI ED in a rat model. We visualized images using immunofluorescence and 3-dimensional imaging of solvent-cleared organs (3DISCO), a novel imaging technique...
November 30, 2018: Journal of Sexual Medicine
Martin G Schultz, Chloe Park, Abigail Fraser, Laura D Howe, Siana Jones, Alicja Rapala, George Davey Smith, James E Sharman, Deborah A Lawlor, Nish Chaturvedi, John Deanfield, Alun D Hughes
PURPOSE: Dynamic exercise results in increased systolic blood pressure (BP). Irrespective of resting BP, some individuals may experience exaggerated rise in systolic BP with exercise, which in adulthood is associated with risk of hypertension, and cardiovascular (CV) disease. It is unknown if exercise BP is associated with markers of CV structure during adolescence. We examined this question in a large adolescent cohort taking account of the possible confounding effect of body composition and BP status...
January 15, 2019: International Journal of Cardiology
Sang Ouk Wee, Huimin Yan, Abbi Lane-Cordova, Sushant M Ranadive, Alexander J Rosenberg, Daniel W White, Bo Fernhall
The importance of sex differences in the control of blood pressure responses to exercise is controversial. It is unknown whether the potential sex differences are a result of magnitude differences in forward or reflected pressure waves. The purpose of this study was to investigate sex differences in BP following acute exercise using wave separation analysis. Sixty-eight adults (36 females) participated in the study. Aerobic capacity was measured during a graded cycle ergometry test. Central pulse wave analysis was derived from the radial pulse using applanation tonometry and separated into forward and reflected pressure waves before, and 15 min and 30 min after maximum aerobic exercise...
December 3, 2018: International Journal of Sports Medicine
Fushi Bai, Yangyang Long, Kai-Alexander Saalbach, Jens Twiefel
Ultrasonic cavitation peening is a potential surface enhancement process. During this process a high input power is necessary to obtain an effective process result. A small gap, usually less than 1 mm, between the sonotrode tip and the treated surface is also required to avoid substantial energy loss. Due to the high vibration of the sonotrode, many cavitation bubbles are generated, forming a thin bubbly liquid layer in the small gap. The cavitation bubbles in the layer seriously disturb the sound wave propagation and interact with each other...
November 27, 2018: Ultrasonics
M Pilar Montero López, Ana Isabel Mora-Urda, José Geraldo Mill, Amílcar B T Silva, Milena Santos Batista, Maria Del Carmen B Molina
BACKGROUND: To analyze the relationship between early life indicators, blood pressure (BP) and arterial stiffness in childhood, in three samples with different bio-cultural characteristics. METHODS: The total sample included 520 schoolchildren 9-10 years of age from Madrid (Spain), Vitória (Brazil) and Luanda (Angola). Height and weight, BP and carotid-femoral Pulse Wave Velocity (cf-PWV) were measured, all by 1 observer in each site, BMI was calculated. Birth weight, gestational age, type of feeding and age at weaning were extracted from official health cards...
December 2, 2018: American Journal of Hypertension
Asuman Orhan Varoglu, Asude Aksoy
Isotretinoin can have significant adverse reactions on multiple systems. We report a unique case of pseudotumour cerebri and herpes encephalitis resulting due to isotretinoin. A 19-year-old female patient was admitted to our clinic, presenting with headache, nausea, vomiting and fever since three days. She had used isotretinoin for the last two months. The patient's neurological examination revealed the presence of neck stiffnes and a body temperature of 39,0◦C. MRI showed high signal localized to the temporal lobe and insula on the right and widened cerebrospinal fluid signal intensity on either side of the optic nerve...
December 2018: JPMA. the Journal of the Pakistan Medical Association
William R Miranda, Carole A Warnes, Heidi M Connolly, Nathaniel W Taggart, Patrick W O'Leary, Jae K Oh, Alexander C Egbe
BACKGROUND: Diastolic dysfunction is felt to be part of the natural history of patients with prior Fontan operation. Despite that, data on noninvasive assessment of diastolic function and ventricular filling pressures in Fontan patients are limited. METHODS: We included 45 adult Fontan patients who underwent right heart catheterization with pulmonary artery wedge pressure (PAWP) measurement and transthoracic echo-Doppler assessment within 7 days. Offline measurement of systemic atrioventricular valve pulsed-wave (PW) and medial/lateral atrioventricular annular tissue Doppler velocities was performed and correlated to PAWP...
October 25, 2018: International Journal of Cardiology
Myadagmaa Jaalkhorol, Yuki Fujita, Katsuyasu Kouda, Junko Tamaki, Misa Komatsu, Namiraa DongMei, Yuho Sato, Takahiro Tachiki, Akiko Yura, Etsuko Kajita, Sadanobu Kagamimori, Masayuki Iki
OBJECTIVE: Only a few longitudinal studies have assessed the relationship between bone mineral density (BMD) and arteriosclerosis. This study aimed to determine whether low BMD at baseline is associated with the development of increased arterial stiffness, as evaluated by brachial-ankle pulse wave velocity (baPWV), in Japanese women. METHODS: A baPWV value of ≥1800 cm/s was adopted as the criterion for increased arterial stiffness, i.e., the outcome of the study...
January 2019: Maturitas
U Daood, A S Fawzy
OBJECTIVE: To investigate effects of HIFU on macrophage phenotype, surface micro-topography and nano-scale surface mechanical properties of dental cementum. MATERIALS AND METHODS: Root discs (2 mm thickness) were cut apical to CEJ and sectioned into quadrants. HIFU setup with bowl-shaped piezo ceramic transducer submerged in a water tank was used for exposure on each specimen for 15 s, 30 s or 60 s. The specimens of the control group were left without any HIFU exposure...
November 19, 2018: Archives of Oral Biology
Arvin Farid, Atena Najafi, Jim Browning, Elisa Barney Smith
Air sparging is a popular, yet slow, remediation technology for soil and groundwater contaminated with volatile organic compounds (VOCs). This paper theoretically and experimentally studies the effect of electromagnetic (EM) waves on air-channel formation within a glass-bead medium-used as an analogy to soil-during air-sparging experiments. The impact of EM waves on cleanup is not the focus of this paper, and the impact on airflow may or may not positively impact resulting cleanup process using air sparging to remove VOCs through volatilization...
November 14, 2018: Journal of Contaminant Hydrology
Dagnovar Aristizábal-Ocampo, Diego Espíndola-Fernández, Jaime Gallo-Villegas
BACKGROUND: Carotid-femoral pulse wave velocity (PWV) is a direct measure of aortic stiffness used in the stratification of cardiovascular risk. Its clinical application in Latin America has been limited by the absence of reference values. The objective of this study was to establish PWV reference values among adults referred to a specialized cardiology center for 24-hour ambulatory blood pressure monitoring (ABPM) in Medellín, Colombia. METHODS: A descriptive study of 3,160 records of adult (older than 18 years) patients without pharmacological treatment assessed for PWV using a Mobil-O-Graph® 24-hour PWA device (IEM, Stolberg, Germany) and 24-hour ABPM with hemodynamic parameters based on suspected hypertension or hypotension was conducted...
December 2, 2018: Clinical and Experimental Hypertension: CHE
Hillary W Gao, Kimberly I Mishra, Annemarie Winters, Sidney Wolin, David G Grier
We present a system for measuring the amplitude and phase profiles of the pressure field of a harmonic acoustic wave with the goal of reconstructing the volumetric sound field. Unlike optical holograms that cannot be reconstructed exactly because of the inverse problem, acoustic holograms are completely specified in the recording plane. We demonstrate volumetric reconstructions of simple arrangements of objects using the Rayleigh-Sommerfeld diffraction integral and introduce a technique to analyze the dynamic properties of insonated objects...
November 2018: Review of Scientific Instruments
S D Eder, A Salvador Palau, T Kaltenbacher, G Bracco, B Holst
Supersonic molecular beams are used in many applications ranging from spectroscopy and matter wave optics to surface science. The experimental setup typically includes a conically shaped, collimating aperture, the skimmer. It has been reported that microskimmers with diameters below 10 μ m produce beams with significantly broader velocity distributions (smaller speed ratios) than larger skimmers. Various explanations for this phenomenon have been proposed, but up till now, only a limited amount of data has been available...
November 2018: Review of Scientific Instruments
Jidong Sung, Soo Jin Cho, Kyong Pyo Hong
BACKGROUND: There is a well-established relationship between cardiorespiratory fitness (CRF) and arterial stiffness. However, it is unclear whether this relationship differs significantly between hypertensive and non-hypertensive patients. METHODS: Adults without a history of ischemic heart disease or stroke and normal exercise test results who underwent health screening were included. Cardiopulmonary function test was performed using the Bruce protocol. Peak oxygen consumption (VO2peak) was measured...
November 30, 2018: Clinical and Experimental Hypertension: CHE
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