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https://www.readbyqxmd.com/read/28303272/structural-and-functional-differences-between-aorta-and-vena-cava
#1
Jeffrey M Mattson, Yanhang Zhang
Elastin and collagen fibers are the major load-bearing extracellular matrix (ECM) constituents of the vascular wall. Arteries function differently than veins in the circulatory system, however as a result from several treatment options veins are subjected to sudden elevated arterial pressure. It is thus important to recognize the fundamental structure and function differences between a vein and an artery. Our research compared the relationship between biaxial mechanical function and ECM structure of porcine thoracic aorta and inferior vena cava...
March 17, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28293551/timely-pulmonary-valve-replacement-may-allow-preservation-of-left-ventricular-circumferential-strain-in-patients-with-tetralogy-of-fallot
#2
Barbara E U Burkhardt, Marí Nieves Velasco Forte, Saravanan Durairaj, Isma Rafiq, Israel Valverde, Animesh Tandon, John Simpson, Tarique Hussain
INTRODUCTION: Patients with Tetralogy of Fallot (TOF) and pulmonary insufficiency and a dilated right ventricle (RV) may suffer from a reduction in left ventricular (LV) performance. It is not clear whether timely pulmonary valve replacement (PVR) preserves LV mechanics. METHODS: Ten TOF patients who underwent PVR were identified from hospital records, and pre- and postoperative cardiac magnetic resonance images were post-processed with a semi-automatic tissue tracking software...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28287503/a-multisensing-setup-for-the-intelligent-tire-monitoring
#3
Francesco Coppo, Gianluca Pepe, Nicola Roveri, Antonio Carcaterra
The present paper offers the chance to experimentally measure, for the first time, the internal tire strain by optical fiber sensors during the tire rolling in real operating conditions. The phenomena that take place during the tire rolling are in fact far from being completely understood. Despite several models available in the technical literature, there is not a correspondently large set of experimental observations. The paper includes the detailed description of the new multi-sensing technology for an ongoing vehicle measurement, which the research group has developed in the context of the project OPTYRE...
March 12, 2017: Sensors
https://www.readbyqxmd.com/read/28285328/left-ventricular-mechanics-in-isolated-mild-mitral-stenosis-a-three-dimensional-speckle-tracking-study
#4
Esra Poyraz, Tuğba Kemaloğlu Öz, Gönül Zeren, Tolga Sinan Güvenç, Cevdet Dönmez, Fatma Can, Rengin Çetin Güvenç, Şennur Ünal Dayı
In a fraction of patients with mild mitral stenosis, left ventricular systolic function deteriorates despite the lack of hemodynamic load imposed by the dysfunctioning valve. Neither the predisposing factors nor the earlier changes in left ventricular contractility were understood adequately. In the present study we aimed to evaluate left ventricular mechanics using three-dimensional (3D) speckle tracking echocardiography. A total of 31 patients with mild rheumatic mitral stenosis and 27 healthy controls were enrolled to the study...
March 11, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28285119/fitness-in-young-adulthood-and-long-term-cardiac-structure-and-function-the-cardia-study
#5
Ambarish Pandey, Norrina B Allen, Colby Ayers, Jared P Reis, Henrique T Moreira, Stephen Sidney, Jamal S Rana, David R Jacobs, Lisa S Chow, James A de Lemos, Mercedes Carnethon, Jarett D Berry
OBJECTIVES: This study sought to evaluate the association between early-life cardiorespiratory fitness (CRF) and measures of left ventricular (LV) structure and function in midlife. BACKGROUND: Low CRF in midlife is associated with a higher risk of heart failure. However, the unique contributions of early-life CRF toward measures of LV structure and function in middle age are not known. METHODS: CARDIA (Coronary Artery Risk Development in Young Adults) study participants with a baseline maximal treadmill test and an echocardiogram at year 25 were included...
March 5, 2017: JACC. Heart Failure
https://www.readbyqxmd.com/read/28275864/longitudinal-assessment-of-myocardial-function-in-childhood-chronic-kidney-disease-during-dialysis-and-following-kidney-transplantation
#6
Rawan K Rumman, Ronand Ramroop, Rahul Chanchlani, Mikaeel Ghany, Diane Hebert, Elizabeth A Harvey, Rulan S Parekh, Luc Mertens, Michael Grattan
BACKGROUND: Childhood chronic kidney disease (CKD) and dialysis are associated with increased long-term cardiovascular risk. We examined subclinical alterations in myocardial mechanics longitudinally in children with CKD, during dialysis, and following renal transplantation. METHODS: Forty-eight children with CKD (stage III or higher) who received kidney transplants from 2008 to 2014 were included in a retrospective study and compared to 192 age- and sex-matched healthy children...
March 8, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28275558/myocardial-strain-and-symptom-severity-in-severe-aortic-stenosis-insights-from-cardiovascular-magnetic-resonance
#7
Tarique Al Musa, Akhlaque Uddin, Peter P Swoboda, Pankaj Garg, Timothy A Fairbairn, Laura E Dobson, Christopher D Steadman, Anvesha Singh, Bara Erhayiem, Sven Plein, Gerald P McCann, John P Greenwood
BACKGROUND: Symptomatic severe aortic stenosis (AS) is a class I indication for replacement in patients when left ventricular ejection fraction (LVEF) is preserved. However, symptom reporting is often equivocal and decision making can be challenging. We aimed to quantify myocardial deformation using cardiovascular magnetic resonance (CMR) in patients classified by symptom severity. METHODS: Forty-two patients with severe AS referred to heart valve clinic were studied using tagged CMR imaging...
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28274715/speckle-tracking-echocardiography-improves-pre-operative-risk-stratification-before-the-total-cavopulmonary-connection
#8
Patsy W Park, Andrew M Atz, Carolyn L Taylor, Shahryar M Chowdhury
INTRODUCTION: Single-ventricle patients with elevated pulmonary vascular resistance (PVR) or end-diastolic pressure (EDP) are excluded from undergoing total cavopulmonary connection (TCPC). However, a subset of patients deemed to be at acceptable risk experience prolonged length of stay (LOS) after TCPC. Routine assessment of ventricular function has been inadequate in identifying these high-risk patients. Speckle-tracking echocardiography (STE) is a novel method for assessment of myocardial deformation that may be useful in single-ventricle patients...
March 5, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28269196/characterization-of-patient-specific-biventricular-mechanics-in-heart-failure-with-preserved-ejection-fraction-hyperelastic-warping
#9
Hua Zou, Xiaodan Zhao, Xi Ce, Lik Chuan Lee, Martin Genet, Yi Su, Rusan Tan, Liang Zhong
Heart failure with preserved ejection fraction (HFPEF) is considered as a major public health problem. Traditionally, HFPEF is diagnosed based on a "normal" EF, but the studies have explored the potential role of left ventricular mechanics. Furthermore, right ventricular mechanics and bi-ventricular interaction in HFPEF is currently not well understood. In this study, we aim to develop a framework using a hyperelastic warping approach to quantify bi-ventricular and septum strains from cardiac magnetic resonance (CMR) images...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268110/impaired-single-right-ventricular-function-compared-to-single-left-ventricles-during-the-early-stages-of-palliation-a-longitudinal-study
#10
Somjate Suntratonpipat, Nee S Khoo, Timothy Colen, Mohammed Alhabdan, Dongngan Troung, Norazah Zahari, Shelby Kutty, Jeffrey F Smallhorn, Edythe B Tham
BACKGROUND: Single right ventricles (SRV) are postulated to be disadvantaged compared with single left ventricles (SLV). We compared the evolution of SRV versus SLV function during infancy using conventional measures and speckle tracking echocardiography (STE). We hypothesized that the SRV is mechanically disadvantaged during early infancy. METHODS: SRVs (n = 32) were compared with SLVs (n = 16) at the neonatal (presurgery) and pre-bidirectional cavopulmonary anastomosis (pre-BCPA) stages...
March 3, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28268036/effect-of-hypoxemia-on-fetal-ventricular-deformation-in-a-chronically-instrumented-sheep-model
#11
Amarnath Bhide, Juha Rasanen, Heikki Huhta, Juulia Junno, Tiina Erkinaro, Pasi Ohtonen, Mervi Haapsamo, Ganesh Acharya
We hypothesized that in near-term sheep fetuses, hypoxemia changes myocardial function as reflected in altered ventricular deformation on speckle-tracking echocardiography. Fetuses in 21 pregnant sheep were instrumented. After 4 d of recovery, fetal cardiac function was assessed by echocardiography at baseline, after 30 and 120 min of induced fetal hypoxemia and after its reversal. Left (LV) and right (RV) ventricular cardiac output and myocardial strain were measured. Baseline mean (standard deviation [SD]) LV and RV global longitudinal strains were -18...
March 4, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28267556/intra-and-inter-observer-reproducibility-of-global-and-regional-magnetic-resonance-feature-tracking-derived-strain-parameters-of-the-left-and-right-ventricle
#12
Björn Schmidt, Anastasia Dick, Melanie Treutlein, Petra Schiller, Alexander C Bunck, David Maintz, Bettina Baeßler
OBJECTIVES: To investigate the reproducibility of regional and global strain and strain rate (SR) parameters of both ventricles and to determine sample sizes for all investigated strain and SR parameters in order to generate a practical reference for future studies. MATERIALS AND METHODS: The study population consisted of 20 healthy individuals and 20 patients with acute myocarditis. Cine sequences in three horizontal long axis views and a stack of short axis views covering the entire left and right ventricle (LV, RV) were retrospectively analysed using a dedicated feature tracking (FT) software algorithm (TOMTEC)...
April 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28267539/assessment-of-left-ventricular-deformation-in-patients-with-ebstein-s-anomaly-by-cardiac-magnetic-resonance-tissue-tracking
#13
Xi Liu, Qin Zhang, Zhi-Gang Yang, Ke Shi, Hua-Yan Xu, Lin-Jun Xie, Li Jiang, Kai-Yue Diao, Ying-Kun Guo
PURPOSE: The aim of this study was to clarify the feasibility of myocardial strain using cardiovascular magnetic resonance (CMR) for the evaluation of left ventricular (LV) deformation in patients with Ebstein's anomaly (EA). MATERIALS AND METHODS: We recruited 32 patients with EA and 30 controls for CMR examination and measured LV function, dimension and tissue tracking parameters (the global and regional radial, circumferential and longitudinal peak strain), together with the right ventricle (RV) dimension...
April 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28267040/aortic-arch-mechanics-measured-with-two-dimensional-speckle-tracking-echocardiography
#14
Rogério Teixeira, Ricardo Monteiro, Rui Baptista, Telmo Pereira, Miguel A Ribeiro, Alexandra Gonçalves, Nuno Cardim, Lino Gonçalves
PURPOSE: To study the feasibility of vascular mechanics at the aortic arch with two-dimensional speckle tracking echocardiography, as well as to define normal values and to compare results between hypertensive patients and healthy patients. METHODS: We included 107 patients (61 healthy patients and 46 hypertensive patients) who underwent a complete echocardiographic exam, including a short-axis view of the aortic arch. The speckle tracking methodology was used to calculate aortic arch mechanics offline (EchoPAC; GE Healthcare)...
March 6, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28262286/pulmonary-arterial-strain-and-remodeling-induced-stiffening-are-differentiated-in-a-chronic-model-of-pulmonary-hypertension
#15
Mark J Golob, Diana M Tabima, Gregory D Wolf, James L Johnston, Omid Forouzan, Ashley M Mulchrone, Heidi B Kellihan, Melissa L Bates, Naomi C Chesler
Pulmonary hypertension (PH) is a debilitating vascular disease that leads to pulmonary artery (PA) stiffening, which is a predictor of patient mortality. During PH development, PA stiffening adversely affects right ventricular function. PA stiffening has been investigated through the arterial nonlinear elastic response during mechanical testing using a canine PH model. However, only circumferential properties were reported and in the absence of chronic PH-induced PA remodeling. Remodeling can alter arterial nonlinear elastic properties via chronic changes in extracellular matrix (ECM) content and geometry...
February 21, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28260735/mechanisms-of-left-ventricular-dysfunction-assessed-by-layer-specific-strain-analysis-in-patients-with-repaired-tetralogy-of-fallot
#16
Mariko Yamada, Ken Takahashi, Maki Kobayashi, Kana Yazaki, Hirobumi Takayasu, Katsumi Akimoto, Masahiko Kishiro, Akio Inage, Tadahiro Yoshikawa, In-Sam Park, Keisuke Nakanishi, Shiori Kawasaki, Toshiaki Shimizu
BACKGROUND: Left ventricular (LV) dysfunction in patients with repaired tetralogy of Fallot (rTOF) is an important risk factor for adverse outcomes. The aim of this study was to assess the details and time course of such LV dysfunction using layer-specific strain analysis by echocardiography.Methods and Results:The 66 patients with rTOF (mean age, 16.3±9.3 years) were divided into 3 groups (T1: 4-10 years, T2: 11-20 years, T3: 21-43 years), and 113 controls of similar age (mean age, 17...
March 3, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28259304/detection-of-acute-changes-in-left-ventricular-function-by-myocardial-deformation-analysis-after-excessive-alcohol-ingestion
#17
Jörg Schröder, Sandra Hamada, Ertunc Altiok, Mohammad Almalla, Chrysoula Koutziampasi, Andreas Napp, András Keszei, Marc Hein, Michael Becker
BACKGROUND: The effects of acute excessive alcohol ingestion on echocardiographic parameters of left ventricular (LV) function are unclear. METHODS: One hundred ninety-nine healthy subjects (44 ± 5 years, 71% male) were prospectively examined within 6 hours after excessive alcohol ingestion as well as after 4 weeks with strict alcohol abstinence. Echocardiography was performed at baseline and follow-up for conventional parameters (left ventricular ejection fraction [LVEF], transmitral E and A Doppler flow velocities, E/A ratio, tissue Doppler velocity lateral and septal (é), E/é ratio, deceleration time of E, and isovolumic relaxation time) and myocardial deformation data (such as global radial and global and layer-specific circumferential [endo and epi global CS] and longitudinal [endo and epi global LS] strain)...
March 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28256296/prediction-of-functional-recovery-after-percutaneous-coronary-revascularization-for-chronic-total-occlusion-using-late-gadolinium-enhanced-magnetic-resonance-imaging
#18
Tatsuya Nakachi, Shingo Kato, Hidekuni Kirigaya, Naoki Iinuma, Kazuki Fukui, Naka Saito, Tae Iwasawa, Masami Kosuge, Kazuo Kimura, Kouichi Tamura
BACKGROUND: Limited data are available regarding the prediction for functional recovery using late gadolinium enhanced magnetic resonance imaging (LGE MRI) after coronary revascularization for chronic total occlusion (CTO PCI). METHODS: We studied 59 patients (mean age, 66±11 years) who underwent successful CTO PCI. Two-dimensional echocardiography and strain measurements were performed before and 8±2 months after CTO PCI. The findings of segmental assessment were compared with the extent of LGE MRI using a 16-segment model...
February 27, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28256008/loss-of-base-to-apex-circumferential-strain-gradient-a-specific-pattern-of-fabry-cardiomyopathy
#19
Fabien Labombarda, Eric Saloux, Guillaume Milesi, Boris Bienvenu
INTRODUCTION AND OBJECTIVES: Cardiac manifestations in Fabry disease are mainly characterized by left ventricular hypertrophy (LVH). The aims of this study were (1) to describe the pattern of regional strain in patients with Fabry disease and (2) to assess whether this pattern may help differentiate patients with Fabry disease from patients with sarcomeric hypertrophic cardiomyopathy (HCM). METHODS: Seventy-seven subjects were investigated: patients with Fabry disease (n=37; 57% with LVH), patients with HCM (n=21), and healthy controls (n=19)...
March 2, 2017: Echocardiography
https://www.readbyqxmd.com/read/28255826/assessment-of-biventricular-systolic-strain-derived-from-the-two-dimensional-and-three-dimensional-speckle-tracking-echocardiography-in-lymphoma-patients-after-anthracycline-therapy
#20
Fei-Yan Song, Jing Shi, Ye Guo, Chu-Jie Zhang, Yu-Chen Xu, Qun-Ling Zhang, Xian-Hong Shu, Lei-Lei Cheng
The aim of this study was to investigate the usefulness of three-dimensional (3D) speckle tracking echocardiography (STE) for assessment of both left and right ventricular systolic function in patients with lymphoma after anthracycline chemotherapy, compared with two-dimensional (2D) STE. Totally eighty-nine patients undergoing anthracycline containing chemotherapy were studied. Echocardiographic assessment included 2D and 3D left ventricular (LV) global longitudinal strain (GLS), global circumferential strain (GCS) and right ventricular (RV) GLS...
March 2, 2017: International Journal of Cardiovascular Imaging
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