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https://www.readbyqxmd.com/read/29150800/beat-to-beat-estimation-of-stroke-volume-using-impedance-cardiography-and-artificial-neural-network
#1
S M M Naidu, Prem C Pandey, Uttam R Bagal, Suhas P Hardas
Impedance cardiography is a low-cost noninvasive technique, based on monitoring of the thoracic impedance, for estimation of stroke volume (SV). Impedance cardiogram (ICG) is the negative of the first derivative of the impedance signal. A technique for beat-to-beat SV estimation using impedance cardiography and artificial neural network (ANN) is proposed. A three-layer feed-forward ANN with error back-propagation algorithm is optimized by examining the effects of number of neurons in the hidden layer, activation function, training algorithm, and set of input parameters...
November 18, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29145641/changes-in-global-longitudinal-strain-and-left-ventricular-ejection-fraction-during-the-first-year-after-myocardial-infarction-results-from-a-large-consecutive-cohort
#2
Tomasz Baron, Christina Christersson, Gustav Hjorthén, Eva-Maria Hedin, Frank A Flachskampf
Aims: To determine changes of global longitudinal strain (GLS) and their predictors in relation to classical echocardiographic parameters of left ventricular (LV) function, over 1 year, in consecutive patients with myocardial infarction (MI) and initially normal or impaired LV ejection fraction (EF). Methods and results: A total of 285 patients with MI prospectively included in the REBUS (RElevance of Biomarkers for future risk of thromb-oembolic events in UnSelected post-myocardial infarction patients) study underwent echocardiography within 72 h from admission and after 1 year...
November 13, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29143104/left-ventricular-end-diastolic-dimension-and-septal-e-are-predictors-of-cardiac-index-at-rest-while-tricuspid-annular-plane-systolic-excursion-is-a-predictor-of-peak-oxygen-uptake-in-patients-with-pulmonary-hypertension
#3
Yoshihisa Nakano, Naoki Okumura, Shiro Adachi, Shigetake Shimokata, Fumitaka Tajima, Yoshihiro Kamimura, Toyoaki Murohara, Takahisa Kondo
Little is known regarding a correlation of hemodynamics at rest or exercise capacity with echocardiographic parameters in patients with pulmonary hypertension (PH). To clarify these potential correlations, we performed transthoracic echocardiography, right heart catheterization, and cardiopulmonary exercise testing in 53 patients with pulmonary arterial hypertension (PAH) and chronic thromboembolic pulmonary hypertension (CTEPH). Left ventricular end-diastolic dimension (LVDd), early diastolic velocity of the septal mitral annulus (septal e'), tricuspid regurgitation peak gradient (TRPG), and tricuspid annular plane systolic excursion (TAPSE) were significantly correlated with cardiac index (LVDd; r = 0...
November 15, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/29128265/atrial-flutter-has-less-left-atrial-spontaneous-contrast-and-higher-left-atrial-appendage-emptying-velocity-compared-with-atrial-fibrillation
#4
Jennifer J Huang, Sridhar Reddy, Tam H Truong, Prakash Suryanarayana, Joseph S Alpert
BACKGROUND: The risk of stroke and thromboembolism in atrial fibrillation is established. There are clear guidelines in anticoagulation management of patient's with atrial fibrillation, however, the evidence surrounding the risk of thromboembolism in patients with atrial flutter is not as clear. We hypothesized that atrial flutter would have indicators of less risk for thromboembolism compared with atrial fibrillation on transesophageal echocardiography (TEE); thereby possibly leading to a lower stroke risk...
November 8, 2017: American Journal of Medicine
https://www.readbyqxmd.com/read/29126782/feasibility-and-limitations-of-mitral-valve-repair-with-or-without-left-ventricular-reconstruction-in-non-ischemic-dilated-cardiomyopathy
#5
Yasushige Shingu, Tomonori Ooka, Hiroki Katoh, Tsuyoshi Tachibana, Suguru Kubota, Yoshiro Matsui
BACKGROUND: Although non-transplant surgical interventions for non-ischemic dilated cardiomyopathy (NIDCM) are relatively effective, their feasibility and limitations have not been fully elucidated. The aim of this study was to define the feasibility and limitations of mitral valve repair, with or without surgical ventricular reconstruction for patients with NIDCM in terms of postoperative low cardiac output syndrome (LOS). METHODS: Twenty non-transplant candidates (aged 57±13 years) with NIDCM and significant mitral regurgitation had undergone mitral valve repair combined with submitral procedures...
November 7, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/29117962/lower-cardiac-index-levels-relate-to-lower-cerebral-blood-flow-in-older-adults
#6
Angela L Jefferson, Dandan Liu, Deepak K Gupta, Kimberly R Pechman, Jennifer M Watchmaker, Elizabeth A Gordon, Swati Rane, Susan P Bell, Lisa A Mendes, L Taylor Davis, Katherine A Gifford, Timothy J Hohman, Thomas J Wang, Manus J Donahue
OBJECTIVE: To assess cross-sectionally whether lower cardiac index relates to lower resting cerebral blood flow (CBF) and cerebrovascular reactivity (CVR) among older adults. METHODS: Vanderbilt Memory & Aging Project participants free of stroke, dementia, and heart failure were studied (n = 314, age 73 ± 7 years, 59% male, 39% with mild cognitive impairment). Cardiac index (liters per minute per meter squared) was quantified from echocardiography. Resting CBF (milliliters per 100 grams per minute) and hypercapnia-induced CVR were quantified from pseudo-continuous arterial spin-labeling MRI...
November 8, 2017: Neurology
https://www.readbyqxmd.com/read/29114921/association-of-early-left-ventricular-dysfunction-with-advanced-magnetic-resonance-white-matter-and-gray-matter-brain-measures-the-cardia-study
#7
Anderson C Armstrong, Majon Muller, Bharath Ambale-Ventakesh, Michael Halstead, Satoru Kishi, Nick Bryan, Stephen Sidney, Luís C L Correia, Samuel S Gidding, Lenore J Launer, João A C Lima
INTRODUCTION: Relations between heart failure and clinically manifested stroke are well known, but the associations between heart and brain early abnormalities are not totally clear. AIMS: We explore relations of subclinical brain abnormalities with early cardiac dysfunction in a large healthy middle-aged biracial cohort. METHODS: The CARDIA study enrolled 5115 young adults aged 18-30 years at baseline (1985-1986). We assessed 719 Caucasian and African American participants of the CARDIA study, with echocardiograms and brain MRI at follow-up year 25 (2010-2011)...
November 8, 2017: Echocardiography
https://www.readbyqxmd.com/read/29111423/maternal-cardiovascular-dysfunction-in-women-with-early-onset-preeclampsia-and-late-onset-preeclampsia-a-cross-sectional-study
#8
Sindhura Vaddamani, Anish Keepanasseril, Ajith Ananthakrishna Pillai, Binay Kumar
OBJECTIVES: To compare the cardiovascular changes associated with early onset (EOPE) and late onset (LOPE) subtypes of preeclampsia. METHODS: A prospective matched cross-sectional study involving 50 women each with early and late onset subtypes of preeclampsia conducted in a tertiary hospital in South India. Cardiac function and remodelling were assessed by conventional 2D, M-mode and doppler echocardiography. RESULTS: Women with EOPE had a significantly more altered left ventricular (LV) geometry, global LV diastolic dysfunction, impairment in myocardial contractility (40% vs...
October 25, 2017: Pregnancy Hypertension
https://www.readbyqxmd.com/read/29111002/free-fatty-acid-as-a-determinant-of-ischemic-lesion-volume-in-nonarterial-origin-embolic-stroke
#9
Jong-Won Chung, Woo-Keun Seo, Gyeong-Moon Kim, Chin-Sang Chung, Kwang Ho Lee, Oh Young Bang
GOALS: This study aimed to determine whether the plasma levels of free fatty acid (FFA) are associated with ischemic lesion characteristics in nonarterial-origin embolic stroke. MATERIALS AND METHODS: We prospectively recruited 254 patients with acute cerebral infarction caused by cardioembolic stroke (CES, n=121) or with embolic stroke of undetermined source (ESUS, n=133). Plasma levels of FFA were measured during the acute stage (median of 2days after stroke onset)...
November 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29106575/is-the-stroke-volume-during-post-ectopic-beat-associated-with-ventricular-premature-complex-related-symptoms
#10
Hye Bin Gwag, Eun Kyoung Kim, Jin Kyung Hwang, Seung-Jung Park, Young Keun On, June Soo Kim, Kyoung-Min Park
Aims: This study aimed to investigate if increased stroke volume (SV) after a ventricular premature complex (VPC) was related to VPC-related symptoms. Methods and results: We selected patients having an isolated VPC during echocardiography from a prospective registry that included patients with a structurally normal heart and 24-h VPC >1%. Patients were divided into two groups according to the presence or absence of VPC-related symptoms (skipped beat or palpitation) when VPC occurred...
July 3, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29102689/early-experience-with-new-transcatheter-mitral-valve-replacement
#11
Vinayak Bapat, Vivek Rajagopal, Christopher Meduri, R Saeid Farivar, Antony Walton, Stephen J Duffy, Robert Gooley, Aubrey Almeida, Michael J Reardon, Neal S Kleiman, Konstantinos Spargias, Stratis Pattakos, Martin K Ng, Michael Wilson, David H Adams, Martin Leon, Michael J Mack, Sharla Chenoweth, Paul Sorajja
BACKGROUND: Transcatheter mitral valve replacement (TMVR) is a potential therapy for patients with symptomatic, severe mitral regurgitation (MR). The feasibility of this therapy remains to be defined. OBJECTIVE: We report our early experience with TMVR using a new valve system. METHODS: The valve is a self-expanding, nitinol valve with bovine pericardial leaflets that is placed using a transapical delivery system. Patients with symptomatic MR who were deemed high or extreme risk by the local heart teams were enrolled in a global pilot study at 14 sites (U...
October 25, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29101521/impact-of-transducer-frequency-setting-on-speckle-tracking-measures
#12
Flemming Javier Olsen, Jesper Hastrup Svendsen, Lars Køber, Søren Højberg, Ketil Haugan, Jan Skov Jensen, Tor Biering-Sørensen
Speckle tracking echocardiography is an emerging technique, which is currently being included in clinical guidelines. We sought to investigate the impact of transducer frequency settings on speckle tracking derived measures. The study comprised of 22 subjects prospectively enrolled for a randomized controlled trial (LOOP-study, Clinicaltrials.gov:NCT02036450). Patients were above 70 years of age with increased risk of stroke, and had an echocardiogram performed, which included focused images of the left ventricle...
November 3, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29093429/echocardiographic-assessment-of-cardiac-structural-and-functional-abnormalities-in-patients-with-end-stage-renal-disease-receiving-chronic-hemodialysis
#13
Hiroshi Matsuo, Kaoru Dohi, Hirofumi Machida, Hideyuki Takeuchi, Toshikazu Aoki, Hiroyuki Nishimura, Masashi Yasutomi, Michiharu Senga, Takehiko Ichikawa, Kentaro Kakuta, Yasuhide Mizutani, Akiko Tanoue, Naoki Isaka, Kazuki Oosugi, Sukenari Koyabu, Masato Sakurai, Yoshihisa Fukui, Hitoshi Kakimoto, Tadafumi Sugimoto, Takahiro Ohnishi, Tomohiro Murata, Eiji Ishikawa, Ryuji Okamoto, Tomomi Yamada, Toru Ogura, Yuki Nishimura, Takashi Tanigawa, Shinsuke Nomura, Masakatsu Nishikawa, Masaaki Ito
BACKGROUND: The aim of this study was to assess the echocardiographic characteristics of chronic hemodialysis (HD) patients with end-stage renal disease (ESRD) in a multicenter prospective cohort study.Methods and Results:Three hundred and fifteen patients with ESRD (67.9±10.6 years, 47.6% male) on chronic HD for ≥1 year were examined on transthoracic echocardiography, including Doppler-derived aortic valve area (AVA) measurement. Only 11.5% and 3.4% of all patients had normal left ventricular (LV) geometry and normal LV filling pattern, respectively...
October 31, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/29089640/acute-and-long-term-cardioprotective-effects-of-the-traditional-chinese-medicine-mlc901-against-myocardial-ischemia-reperfusion-injury-in-mice
#14
Anne Vincent, Aurélie Covinhes, Christian Barrère, Laura Gallot, Soulit Thoumala, Christophe Piot, Catherine Heurteaux, Michel Lazdunski, Joël Nargeot, Stéphanie Barrère-Lemaire
MLC901, a traditional Chinese medicine containing a cocktail of active molecules, both reduces cerebral infarction and improves recovery in patients with ischemic stroke. The aim of this study was to evaluate the acute and long-term benefits of MLC901 in ischemic and reperfused mouse hearts. Ex vivo, under physiological conditions, MLC901 did not show any modification in heart rate and contraction amplitude. However, upon an ischemic insult, MLC901 administration during reperfusion, improved coronary flow in perfused hearts...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29089455/echocardiographic-risk-factors-for-stroke-and-outcomes-in-patients-with-atrial-fibrillation-anticoagulated-with-apixaban-or-warfarin
#15
Dragos Vinereanu, Renato D Lopes, Hillary Mulder, Bernard J Gersh, Michael Hanna, Pedro G M de Barros E Silva, Dan Atar, Lars Wallentin, Christopher B Granger, John H Alexander
BACKGROUND AND PURPOSE: Few data exist on the long-term outcomes of patients with spontaneous echo contrast (SEC), left atrial/left atrial appendage (LA/LAA) thrombus, and complex aortic plaque (CAP), in patients with atrial fibrillation receiving oral anticoagulation. We explored the relationship between these 3 echocardiographic findings and clinical outcomes, and the comparative efficacy and safety of apixaban and warfarin for each finding. METHODS: Patients from the ARISTOTLE trial (Apixaban for Reduction in Stroke and Other Thromboembolic Events in Atrial Fibrillation) with SEC, LA/LAA thrombus, or CAP diagnosed by either transthoracic or transesophageal echocardiography were compared with patients with none of these findings on transesophageal echocardiography...
October 31, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/29082558/quantification-of-the-area-and-shunt-volume-of-multiple-circular-and-noncircular-ventricular-septal-defects-a-2d-3d-echocardiography-comparison-and-real-time-3d-color-doppler-feasibility-determination-study
#16
Evan Tracy, Meihua Zhu, Cole Streiff, David J Sahn, Muhammad Ashraf
BACKGROUND: Quantification of defect size and shunt flow is an important aspect of ventricular septal defect (VSD) evaluation. This study compared three-dimensional echocardiography (3DE) with the current clinical standard two-dimensional echocardiography (2DE) for quantifying defect area and tested the feasibility of real time 3D color Doppler echocardiography (RT3D-CDE) for quantifying shunt volume of irregular shaped and multiple VSDs. METHODS: Latex balloons were sutured into the ventricles of 32 freshly harvested porcine hearts and were connected with tubing placed in septal perforations...
October 29, 2017: Echocardiography
https://www.readbyqxmd.com/read/29081172/-effect-of-transcatheter-aortic-valve-replacement-using-venus-a-valve-for-treating-patients-with-severe-aortic-stenosis
#17
G Y Song, M Y Wang, Y Wang, X B Liu, Y Feng, X Q Kong, Y J Wu
Objective: To evaluate the effect of transcatheter aortic valve replacement(TAVR) using Venus-A valve for treating patients with severe aortic stenosis. Methods: In this prospective study, 101 consecutive severe aortic stenosis patients with high surgical risk(Society of Thoracic Surgeon(STS) score ≥4%) or at prohibitive surgical risk were enrolled from 5 academic cardiovascular centers in China(Fuwai hospital, the second affiliated hospital of Zhejiang university school of medicine, West China hospital of Sichuan university, the first affiliated hospital of Nanjing medical university, Ruijin hospital of Shanghai Jiaotong university school of medicine) from September 2012 to January 2015, and Venus-A valves were used in TAVR for these patients...
October 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/29080093/effectiveness-and-long-term-outcomes-of-surgical-intervention-for-constrictive-epicardium-in-constrictive-pericarditis
#18
Yangsin Lee, Yoshihiro Naruse, Keita Tanaka
OBJECTIVE: Epicardial resection is considered effective in patients with constrictive pericarditis accompanied by epicardial constriction, but few publications have evaluated its long-term outcomes. The study objective was to evaluate early and late results of epicardial resection. METHODS: A total of 22 patients with pericardiectomy for constrictive pericarditis were treated at our institution between 1989 and 2016. They were stratified by the presence or absence of constrictive epicardium and the surgical intervention performed...
October 27, 2017: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29074483/transjugular-intrahepatic-portosystemic-shunt-impact-on-systemic-haemodynamics-and-renal-and-cardiac-function-in-patients-with-cirrhosis
#19
Troels Malte Busk, Flemming Bendtsen, Jørgen Hjelm Poulsen, Jens Otto Clemmesen, Fin Stolze Larsen, Jens Peter Goetze, Jens Schmidt Iversen, Magnus Thorsten Jensen, Rasmus Møgelvang, Erling Bjerregaard Pedersen, Jesper Noergaard Bech, Søren Møller
BACKGROUND AND AIMS: Transjugular intrahepatic portosystemic shunt (TIPS) alleviates portal hypertension and possibly increases central blood volume (CBV). Moreover, renal function often improves; however, its effects on cardiac function are unclear. The aims of our study were to examine the effects of TIPS on hemodynamics and renal and cardiac function in patients with cirrhosis. METHODS: In 25 cirrhotic patients, we analyzed systemic, cardiac, and splanchnic hemodynamics by catheterization of the liver veins and right heart chambers before and 1 week after TIPS...
October 26, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29072062/morpho-functional-cardiovascular-adaptation-in-hypertensive-patients-two-dimensional-speckle-tracking-echocardiographic-study
#20
Ines P Monte, Chiara DI Benedetto, Filippo A Atanasio, Valentina Losi, Salvatore Licciardi, Corrado Tamburino
BACKGROUND: Twenty-four-hour Blood Pressure (BP) variability is an important predictor of organ damage and cardiovascular events. Although epidemiological data are widely based on evaluation of office (Clinic) BP, 24-hour Ambulatory BP monitoring (ABPM) accurately assess the severity of hypertension to predict cardiovascular events in hypertensive patients, because it more accurately reflects BP load on heart and blood vessels. Conventional transthoracic echocardiography (TTE), such as M-mode and two-dimensional (2D), and more advanced techniques, such as tissue Doppler imaging (TDI) and speckle tracking echocardiography (STE), are used to identify pathological changes of the hypertensive heart disease...
October 25, 2017: Minerva Cardioangiologica
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