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Augmentation Index

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https://www.readbyqxmd.com/read/28734918/rv-myocardial-strain-during-pre-load-augmentation-is-associated-with-exercise-capacity-in-patients-with-chronic-hf
#1
Kenya Kusunose, Hirotsugu Yamada, Susumu Nishio, Ayumi Ishii, Yukina Hirata, Hiromitsu Seno, Yoshihito Saijo, Takayuki Ise, Koji Yamaguchi, Shusuke Yagi, Takeshi Soeki, Tetsuzo Wakatsuki, Masataka Sata
OBJECTIVES: The aim of this study was to assess the relationship between right ventricular (RV) function during pre-load augmentation and exercise tolerance. BACKGROUND: Peak oxygen uptake (VO2) is a strong predictor of mortality in chronic heart failure. Cardiac function during pre-load augmentation is an important part of the phenomenon in the evaluation of exercise capacity. METHODS: We prospectively performed echocardiographic studies in 68 chronic heart failure patients with cardiopulmonary exercise testing (mean age 60 ± 12 years; 69% male)...
July 13, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28729675/oxygen-induced-impairment-in-arterial-function-is-corrected-by-slow-breathing-in-patients-with-type-1-diabetes
#2
Luciano Bernardi, Daniel Gordin, Marco Bordino, Milla Rosengård-Bärlund, Anna Sandelin, Carol Forsblom, Per-Henrik Groop
Hyperoxia and slow breathing acutely improve autonomic function in type-1 diabetes. However, their effects on arterial function may reveal different mechanisms, perhaps potentially useful. To test the effects of oxygen and slow breathing we measured arterial function (augmentation index, pulse wave velocity), baroreflex sensitivity (BRS) and oxygen saturation (SAT), during spontaneous and slow breathing (6 breaths/min), in normoxia and hyperoxia (5 L/min oxygen) in 91 type-1 diabetic and 40 age-matched control participants...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728487/feasibility-and-characteristics-of-arterial-stiffness-measurement-in-preschool-children
#3
Maaike M Vanderschuren, Cuno Spm Uiterwaal, Cornelis K van der Ent, Jacobien B Eising
Background Arterial stiffness is an important predictor of cardiovascular risk in adult life. Increased arterial stiffness can also be present in children and may be associated with several other cardiovascular risk factors. Until now, however, we know little about measuring arterial stiffness in preschool children. In this study, we assessed the feasibility of measuring arterial stiffness in preschool children and explored possible determinants related to arterial stiffness at this age. Methods We studied 168 healthy children, aged 3...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28728481/feasibility-of-two-dimensional-speckle-tracking-in-evaluation-of-arterial-stiffness-comparison-with-pulse-wave-velocity-and-conventional-sonographic-markers-of-atherosclerosis
#4
Michał Podgórski, Piotr Grzelak, Magdalena Kaczmarska, Michał Polguj, Maciej Łukaszewski, Ludomir Stefańczyk
Objective Arterial stiffening is an early marker of atherosclerosis that has a prognostic value for cardiovascular morbidity and mortality. Although many markers of arterial hardening have been proposed, the search is on for newer, more user-friendly and reliable surrogates. One such potential candidate has emerged from cardiology, the speckle-tracking technique. The aim of this study was to evaluate the feasibility of the two-dimensional speckle tracking for the evaluation of arterial wall stiffness in comparison with standard stiffness parameters...
January 1, 2017: Vascular
https://www.readbyqxmd.com/read/28724946/diastolic-augmentation-index-improves-radial-augmentation-index-in-assessing-arterial-stiffness
#5
Yang Yao, Liling Hao, Lisheng Xu, Yahui Zhang, Lin Qi, Yingxian Sun, Benqiang Yang, Frans N van de Vosse, Yudong Yao
Arterial stiffness is an important risk factor for cardiovascular events. Radial augmentation index (AI r ) can be more conveniently measured compared with carotid-femoral pulse wave velocity (cfPWV). However, the performance of AI r in assessing arterial stiffness is limited. This study proposes a novel index AI rd , a combination of AI r and diastolic augmentation index (AI d ) with a weight α, to achieve better performance over AI r in assessing arterial stiffness. 120 subjects (43 ± 21 years old) were enrolled...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28721151/moderate-dose-atorvastatin-improves-arterial-endothelial-function-in-patients-with-angina-pectoris-and-normal-coronary-angiogram-a-pilot-study
#6
Amela Kabaklić, Zlatko Fras
INTRODUCTION: Endothelial dysfunction could contribute to the pathophysiology of angina pectoris (AP) in patients with normal coronary angiograms. Besides lipid-lowering effects, statins exert pleiotropic effects including improving endothelial function. MATERIAL AND METHODS: Our double-blind study included 58 patients with AP, noninvasively confirmed myocardial ischemia and a normal coronary angiogram. The effect of once-daily 20 mg atorvastatin (A) was compared with placebo (P) for 6 months...
June 2017: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/28719470/diurnal-variation-and-repeatability-of-arterial-stiffness-and-cardiac-output-measurements-in-the-third-trimester-of-uncomplicated-pregnancy
#7
Mohamed W Osman, Francesca Leone, Mintu Nath, Asma Khalil, David R Webb, Thompson G Robinson, Hatem A Mousa
AIM: To investigate same day repeated measures and diurnal variation of arterial stiffness, cardiac output (CO), stroke volume (SV) and total peripheral resistance (TPR) during the third trimester of normal pregnancy. METHODOLOGY: Pulse wave velocity (PWV) and augmentation index (AIx) were recorded using the Arteriograph, while CO, SV and TPR were recorded using noninvasive cardiac output monitoring. The measurements were obtained in the third trimester of pregnancy from 21 healthy pregnant women at four time points (morning, afternoon, evening and midnight) over a 24-h period...
July 14, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28716800/relationship-between-vascular-resistance-and-sympathetic-nerve-fiber-density-in-arterial-vessels-in-children-with-sleep-disordered-breathing
#8
Anna Kontos, Kurt Lushington, James Martin, Quenten Schwarz, Ryan Green, David Wabnitz, Xiangjun Xu, Elke M Sokoya, Scott Willoughby, Mathias Baumert, Antonio Ferrante, Melissa La Forgia, Declan Kennedy
BACKGROUND: Sleep disordered breathing in children is associated with increased blood flow velocity and sympathetic overactivity. Sympathetic overactivity results in peripheral vasoconstriction and reduced systemic vascular compliance, which increases blood flow velocity during systole. Augmented blood flow velocity is recognized to promote vascular remodeling. Importantly, increased vascular sympathetic nerve fiber density and innervation in early life plays a key role in the development of early-onset hypertension in animal models...
July 17, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28716522/exercise-individualized-by-trimpi-method-reduces-arterial-stiffness-in-early-onset-type-2-diabetic-patients-a-randomized-controlled-trial-with-aerobic-interval-training
#9
Alfonso Bellia, Ferdinando Iellamo, Elisa De Carli, Aikaterini Andreadi, Elvira Padua, Mauro Lombardo, Giuseppe Annino, Francesca Campoli, Sara Tartaglione, Stefano D'Ottavio, David Della-Morte, Davide Lauro
BACKGROUND: Arterial stiffness (AS) and baroreflex sensitivity (BRS) are subclinical markers of vascular diseases in type 2 diabetes (T2D). We evaluated the effects of aerobic interval training (AIT), with loads prescribed according to individual heart rate and lactate profiling obtained during a baseline treadmill test (TRIMPi method), on AS and BRS in patients with early-onset T2D without cardiovascular complications. POPULATION STUDY AND METHODS: Twenty-two sedentary overweight T2D patients (aged 57±7years) were randomized to 12-weeks open-label of supervised AIT by TRIMPi (n=8) or unsupervised physical activity as per usual care (SOC) (n=11)...
June 17, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28715576/association-of-ozone-exposure-with-cardiorespiratory-pathophysiologic-mechanisms-in-healthy-adults
#10
Drew B Day, Jianbang Xiang, Jinhan Mo, Feng Li, Mingkei Chung, Jicheng Gong, Charles J Weschler, Pamela A Ohman-Strickland, Jan Sundell, Wenguo Weng, Yinping Zhang, Junfeng Jim Zhang
Importance: Exposure to ozone has been associated with cardiovascular mortality, but the underlying biological mechanisms are not yet understood. Objective: To examine the association between ozone exposure and cardiopulmonary pathophysiologic mechanisms. Design, Setting, and Participants: A longitudinal study involving 89 healthy adult participants living on a work campus in Changsha City, China, was conducted from December 1, 2014, to January 31, 2015...
July 17, 2017: JAMA Internal Medicine
https://www.readbyqxmd.com/read/28711334/fully-automated-comprehensive-knowledge-based-planning-for-stereotactic-radiosurgery-preclinical-validation-through-blinded-physician-review
#11
Benjamin P Ziemer, Satomi Shiraishi, Jona A Hattangadi-Gluth, Parag Sanghvi, Kevin Lawrence Moore
PURPOSE: As knowledge-based planning (KBP) attempts to augment and potentially supplant manual treatment planning, it is imperative to ensure any implementation maintains or improves overall plan quality in any disease site. The purpose of this study was to demonstrate the overall quality of KBP-driven automated stereotactic radiosurgery (SRS) treatment planning using blinded physician comparison and determine systematic factors predictive of physician plan preference to guide future KBP refinement...
April 19, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28706180/serum-uric-acid-and-arterial-function-after-renal-transplantation
#12
Frederic Bauer, Nikolaos Pagonas, Felix S Seibert, Walter Zidek, Richard Viebahn, Nina Babel, Timm H Westhoff
BACKGROUND Hyperuricemia is associated with an increased risk of cardiovascular disease and chronic allograft nephropathy after renal transplantation. It has recently been demonstrated that treatment of asymptomatic hyperuricemia is associated with improved patient and graft survival; although, the underlying mechanisms remain elusive. The present study investigated the association of serum uric acid (SUA) and systemic arterial function after renal transplantation. MATERIAL AND METHODS In a cross-sectional study, arterial function was analyzed in 54 renal transplant recipients by means of pulse wave analysis...
July 14, 2017: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/28706102/a-method-to-assess-obstetric-outcomes-using-the-10-group-classification-system-a-quantitative-descriptive-study
#13
Janne Rossen, Miha Lucovnik, Torbjørn Moe Eggebø, Natasa Tul, Martina Murphy, Ingvild Vistad, Michael Robson
OBJECTIVES: Internationally, the 10-Group Classification System (TGCS) has been used to report caesarean section rates, but analysis of other outcomes is also recommended. We now aim to present the TGCS as a method to assess outcomes of labour and delivery using routine collection of perinatal information. DESIGN: This research is a methodological study to describe the use of the TGCS. SETTING: Stavanger University Hospital (SUH), Norway, National Maternity Hospital Dublin, Ireland and Slovenian National Perinatal Database (SLO), Slovenia...
July 12, 2017: BMJ Open
https://www.readbyqxmd.com/read/28699368/impact-of-blood-pressure-lesion-level-and-physical-activity-on-aortic-augmentation-index-in-persons-with-sci
#14
Caitlyn G Katzelnick, Joseph P Weir, Nancy Chiaravalotti, Glenn Wylie, Trevor Dyson-Hudson, William A Bauman, Jill M Wecht
Individuals with chronic spinal cord injury (SCI) are at a heightened risk of cardiovascular disease (CVD) due to autonomic nervous system dysfunction, physical inactivity and increased inflammatory processes. Arterial stiffness (AS) is recognized as an independent risk factor for CVD and, specifically, pulse wave analysis (PWA) has proven to be a useful tool to predict and track structural arterial changes that reflect arteriosclerosis. The augmentation index (AI) can be used to estimate AS and is derived from the amplitude and timing of the blood pressure (BP) wave reflection in a peripheral artery...
July 12, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28697853/inhibition-of-ataxia-telangiectasia-related-3-atr-improves-therapeutic-index-in-preclinical-models-of-non-small-cell-lung-cancer-nsclc-radiotherapy
#15
Victoria Dunne, Mihaela Ghita, Donna M Small, Caroline B M Coffey, Sinead Weldon, Clifford C Taggart, Sarah O Osman, Conor K McGarry, Kevin M Prise, Gerard G Hanna, Karl T Butterworth
BACKGROUND AND PURPOSE: To evaluate the impact of ATR inhibition using AZD6738 in combination with radiotherapy on the response of non-small cell lung cancer (NSCLC) tumour models and a murine model of radiation induced fibrosis. MATERIALS AND METHODS: AZD6738 was evaluated as a monotherapy and in combination with radiation in vitro and in vivo using A549 and H460 NSCLC models. Radiation induced pulmonary fibrosis was evaluated by cone beam computed tomography (CBCT) and histological staining...
July 8, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28696134/arterial-stiffness-is-associated-to-cardiorespiratory-fitness-and-body-mass-index-in-young-swedish-adults-the-lifestyle-biomarkers-and-atherosclerosis-study
#16
Ulrika Fernberg, Maria Fernström, Anita Hurtig-Wennlöf
Background Early changes in the large muscular arteries are already associated with risk factors as hypertension and obesity in adolescence and young adulthood. The present study examines the association between arterial stiffness measurements, pulse wave velocity and augmentation index and lifestyle-related factors, body composition and cardiorespiratory fitness, in young, healthy, Swedish adults. Design This study used a population-based cross-sectional sample. Methods The 834 participants in the study were self-reported healthy, non-smoking, age 18-25 years...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28695435/evaluation-of-development-of-subclinical-atherosclerosis-in-children-with-uveitis
#17
Seçil Conkar, Suzan Güven Yılmaz, İlker Özgür Koska, Afig Berdeli, Sevgi Mir
Uveitis is a chronic inflammatory disease. Chronic inflammation has been shown to have a role in pathogenesis of atherosclerosis. Atherosclerosis is the most important risk factor of cardiovascular diseases and is shown to start as early as childhood. In this study, we investigated the presence of subclinical atherosclerosis in children with uveitis. Seventy five patients who were diagnosed as having uveitis in ophthalmology and pediatric rheumatology clinics were included in the study. Patients with hypertension, obesity, dyslipidemia, diabetes, and with history of early cardiovascular disease were excluded...
July 10, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28693653/a-methodology-framework-for-weighting-genetic-traits-that-impact-greenhouse-gas-emission-intensities-in-selection-indexes
#18
P R Amer, F S Hely, C D Quinton, A R Cromie
A methodological framework was presented for deriving weightings to be applied in selection indexes to account for the impact genetic change in traits will have on greenhouse gas emissions intensities (EIs). Although the emission component of the breeding goal was defined as the ratio of total emissions relative to a weighted combination of farm outputs, the resulting trait-weighting factors can be applied as linear weightings in a way that augments any existing breeding objective before consideration of EI...
July 11, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28692445/normal-cerebral-vascular-pulsations-in-humans-changes-with-age-and-implications-for-microvascular-disease
#19
Mi O Kim, Yan Li, Fangfei Wei, Jiguang Wang, Michael F O'Rourke, Audrey Adji, Alberto P Avolio
BACKGROUND: Cerebral syndromes in older humans, secondary stroke in younger persons following trauma, and sickle cell anaemia in children, are linked by unexplained microvascular damage and high cerebral pressure or flow pulsations. The aim of this study was to characterize age-related pressure and flow waveforms patterns entering the brain, to explain these in terms of disturbed physiological function, and to consider clinical implications. METHOD: Blood flow velocity waves were measured in four cerebral vascular territories by transcranial Doppler of 1020 apparently normal patients (497 men, 21-78 years)...
July 7, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28690548/optimization-of-variable-ventilation-for-physiology-immune-response-and-surfactant-enhancement-in-preterm-lambs
#20
Erzsébet Bartolák-Suki, Peter B Noble, Samer Bou Jawde, Jane J Pillow, Béla Suki
Preterm infants often require mechanical ventilation due to lung immaturity including reduced or abnormal surfactant. Since cyclic stretch with cycle-by-cycle variability is known to augment surfactant release by epithelial cells, we hypothesized that such in vivo mechanotransduction improves surfactant maturation and hence lung physiology in preterm subjects. We thus tested whether breath-by-breath variability in tidal volume (VT) in variable ventilation (VV) can be tuned for optimal performance in a preterm lamb model...
2017: Frontiers in Physiology
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