keyword
MENU ▼
Read by QxMD icon Read
search

Stroke volume

keyword
https://www.readbyqxmd.com/read/28329267/right-ventricular-recovery-after-bilateral-lung-transplantation-for-pulmonary-arterial-hypertension%C3%A2
#1
Thomas M Gorter, Erik A M Verschuuren, Dirk J van Veldhuisen, Elke S Hoendermis, Michiel E Erasmus, Harm J Bogaard, Anton Vonk Noordegraaf, Rolf M F Berger, Joost P van Melle, Tineke P Willems
OBJECTIVES: Pulmonary arterial hypertension (PAH) is a progressive and often fatal disease characterized by increased pulmonary vascular resistance (PVR) and right ventricular (RV) failure. End-stage PAH is often an indication for a lung transplant (LTX). Our goal was to study ventricular recovery using cardiac magnetic resonance imaging late after LTX. METHODS: We studied 10 patients with PAH who underwent isolated bilateral LTX. RV and left ventricular (LV) volumes, function and mass were measured...
March 3, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28329254/periodic-limb-movements-and-white-matter-hyperintensities-in-first-ever-minor-stroke-or-high-risk-tia
#2
Mark I Boulos, Brian J Murray, Ryan T Muir, Fuqiang Gao, Gregory M Szilagyi, Menal Huroy, Alexander Kiss, Arthur S Walters, Sandra E Black, Andrew S Lim, Richard H Swartz
Study Objectives: Emerging evidence suggests that periodic limb movements (PLMs) may contribute to the development of cerebrovascular disease. White matter hyperintensities (WMHs), a widely accepted biomarker for cerebral small vessel disease, are associated with incident stroke and death. We evaluated the association between increased PLM indices and WMH burden in patients presenting with stroke or transient ischemic attack (TIA), while controlling for vascular risk factors and stroke severity...
December 29, 2016: Sleep
https://www.readbyqxmd.com/read/28329173/mitral-valve-repair-for-secondary-mitral-regurgitation-in-non-ischaemic-dilated-cardiomyopathy-is-associated-with-left-ventricular-reverse-remodelling-and-increase-of-forward-flow
#3
Vasileios Kamperidis, Suzanne E van Wijngaarden, Philippe J van Rosendael, William Kok Fai Kong, Madelien V Regeer, Frank van der Kley, Georgios Sianos, Nina Ajmone Marsan, Jeroen J Bax, Victoria Delgado
Aims: It remains unclear whether surgical or transcatheter mitral valve repair for secondary mitral regurgitation (MR) in patients with non-ischaemic cardiomyopathy reverse the underlying left ventricular (LV) pathophysiology. We hypothesized that mitral valve repair improves LV systolic function and forward flow and induces LV reverse remodelling in this group of patients. Methods and results: Seventy-six patients (65 ± 14 years old, 43% male) with non-ischaemic cardiomyopathy and moderate to severe chronic secondary MR treated successfully with transcatheter or surgical mitral valve repair were evaluated...
February 23, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28329138/small-intestinal-submucosa-tricuspid-valve-tube-graft-shows-growth-potential-remodelling-and-physiological-valve-function-in-a-porcine-model%C3%A2
#4
Diana M Ropcke, Christine Ilkjaer, Marcell J Tjornild, Soren N Skov, Steffen Ringgaard, Vibeke E Hjortdal, Sten L Nielsen
OBJECTIVES: Tricuspid valve reconstruction using small intestinal submucosal extracellular matrix (ECM) designed as a tube graft is possible in severe valve pathology. Using cardiac magnetic resonance imaging (MRI) and digital photograph imaging, valves were evaluated after 6 months in a porcine model. METHODS: Ten 60 kg pigs received a tricuspid valve tube graft. A baseline MRI was performed after 2 weeks ( n  = 8). A follow-up MRI was performed in three of five 6 months' survivors to assess function and haemodynamics of the tricuspid tube graft...
February 27, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28329137/association-of-left-atrial-structure-and-function-and-incident-cardiovascular-disease-in-patients-with-diabetes-mellitus-results-from-multi-ethnic-study-of-atherosclerosis-mesa
#5
Timothy M Markman, Mohammadali Habibi, Bharath Ambale Venketash, Mytra Zareian, Colin Wu, Susan R Heckbert, David A Bluemke, Joao A C Lima
Aims: Diabetes mellitus (DM) is associated with the development of cardiovascular disease (CVD). Morphological changes in the left atrium (LA) may appear before symptoms. We aimed to investigate the association between cardiac magnetic resonance imaging (CMR) measured LA structure and function and incident CVD in asymptomatic individuals with DM. Methods and results: Tissue tracking CMR was used to measure LA size and phasic function (emptying fractions and strain) on all 536 Multi-Ethnic Study of Atherosclerosis (MESA) participants with DM and available CMR at baseline in 2000-2002...
February 28, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28329065/right-ventricular-outflow-tract-systolic-function-correlates-with-exercise-capacity-in-patients-with-severe-right-ventricle-dilatation-after-repair-of-tetralogy-of-fallot
#6
Shuhua Luo, Jianhua Li, Dan Yang, Yaxin Zhou, Qi An, Yucheng Chen
OBJECTIVES: The relationship between exercise capacity and right ventricular (RV) components function in repaired tetralogy of Fallot patients with severely dilated right ventricles is poorly understood. The aim of this study was to characterize the exercise capacity and its relationship to RV global and components function in repaired tetralogy of Fallot patients with RV end-diastolic volume index  >150 ml/m 2 , a currently accepted threshold for pulmonary valve replacement. METHODS: The medical records and results of cardiac magnetic resonance imaging and cardiopulmonary exercise testing of 25 consecutive eligible patients were reviewed...
February 16, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28328241/perfusion-ct-in-acute-stroke-effectiveness-of-automatically-generated-colour-maps
#7
Maja Ukmar, Ferruccio Degrassi, Roberta Antea Pozzi Mucelli, Francesca Neri, Fabio Pozzi Mucelli, Maria Assunta Cova
OBJECTIVE: To evaluate the accuracy of perfusion CT (pCT) in the definition of the infarcted core and the penumbra, comparing the data obtained from the evaluation of parametric maps [cerebral blood volume (CBV), cerebral blood flow (CBF) and mean transit time (MTT)] with software-generated colour maps. METHODS: A retrospective analysis was performed to identify patients with suspected acute ischaemic strokes and who had undergone unenhanced CT and pCT carried out within 4...
April 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28327874/left-atrial-deformation-analysis-in-patients-with-corrected-tetralogy-of-fallot-by-3d-speckle-tracking-echocardiography-from-the-magyar-path-study
#8
Kálmán Havasi, Péter Domsik, Anita Kalapos, Jackie S McGhie, Jolien W Roos-Hesselink, Tamás Forster, Attila Nemes
Background: Three-dimensional (3D) echocardiography coupled with speckle-tracking echocardiographic (STE) capability is a novel methodology which has been demontrated to be useful for the assessment of left atrial (LA) volumes and functional properties. There is increased scientific interest on myocardial deformation analysis in adult patients with corrected tetralogy of Fallot (cTOF). Objectives: To compare LA volumes, volume-based functional properties and strain parameters between cTOF patients and age- and gender-matched healthy controls...
February 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28325900/pegylated-insulin-like-growth-factor-i-affords-protection-and-facilitates-recovery-of-lost-functions-post-focal-ischemia
#9
Kim Parker, Antonio Berretta, Stefanie Saenger, Manaswini Sivaramakrishnan, Simon A Shirley, Friedrich Metzger, Andrew N Clarkson
Insulin-like growth factor-I (IGF-I) is involved in the maturation and maintenance of neurons, and impaired IGF-I signaling has been shown to play a role in various neurological diseases including stroke. The aim of the present study was to investigate the efficacy of an optimized IGF-I variant by adding a 40 kDa polyethylene glycol (PEG) chain to IGF-I to form PEG-IGF-I. We show that PEG-IGF-I has a slower clearance which allows for twice-weekly dosing to maintain steady-state serum levels in mice. Using a photothrombotic model of focal stroke, dosing from 3 hrs post-stroke dose-dependently (0...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28324981/hemodynamic-determinants-and-ventriculo-arterial-coupling-are-sex-associated-in-heart-failure-patients
#10
Peter L Kerkhof, Guy R Heyndrickx, John K-J Li
End-systolic volume (ESV) and end-diastolic volume (EDV) are key parameters in the analysis of left ventricular (LV) function, and the study of cardiac remodeling. The volume regulation graph (VRG) relates these fundamental determinants, and permits convenient stratification for clinically relevant covariates. This contribution analyzes sex-associated differences in hemodynamic parameters for 197 heart failure (HF) patients, evaluated by biplane ventriculography, in combination with arterial pressure. We calculated LV parameters such as stroke volume (SV), cardiac output (CO), ESV, EDV, ejection fraction (EF), end-systolic elastance (Emax), besides arterial parameters: effective arterial elastance (Ea), elastance ratio (the coupling index k), peripheral resistance (Rs), pulse pressure (PP), and arterial compliance (C), all normalized for body surface area when appropriate...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324935/photoplethysmography-towards-a-non-invasive-pressure-measurement-technique
#11
H Njoum, P A Kyriacou
There is a need for non-invasive and continuous blood pressure measurements. This study explored the relationship between Photoplethysmography (PPG) and Pressure-Volume (P-V) changes in an in vitro model. We proposed and compared methods for an estimation of the pulsatile volume, termed as Normalized Pulse Volume (NPV) and Adjusted Pulse Volume (APV). To validate the methods, pressure, Red (R) and InfraRed (IR) PPG signals were recorded continuously in an arterial model utilizing a pulsatile pump. Flow rates were controlled by varying pumping frequencies at low and high stroke volumes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28323841/detection-of-crossed-cerebellar-diaschisis-in-hyperacute-ischemic-stroke-using-arterial-spin-labeled-mr-imaging
#12
Koung Mi Kang, Chul-Ho Sohn, Seung Hong Choi, Keun-Hwa Jung, Roh-Eul Yoo, Tae Jin Yun, Ji-Hoon Kim, Sun-Won Park
BACKGROUND AND PURPOSE: Arterial spin-labeling (ASL) was recently introduced as a noninvasive method to evaluate cerebral hemodynamics. The purposes of this study were to assess the ability of ASL imaging to detect crossed cerebellar diaschisis (CCD) in patients with their first unilateral supratentorial hyperacute stroke and to identify imaging or clinical factors significantly associated with CCD. MATERIALS AND METHODS: We reviewed 204 consecutive patients who underwent MRI less than 8 hours after the onset of stroke symptoms...
2017: PloS One
https://www.readbyqxmd.com/read/28323379/effects-of-short-term-levothyroxine-therapy-on-myocardial-injuries-in-patients-with-severe-overt-hypothyroidism-evidence-from-a-cardiac-mri-study
#13
Xia Gao, Zhe Chen, Min Liu, Yu-Mei Jia, Ning Yang, Zhi Yao, Xiao-Meng Feng, Yuan Xu, Guang Wang
PURPOSE: To investigate using magnetic resonance imaging (MRI) myocardial injuries and cardiac function in patients with newly diagnosed severe primary overt hypothyroidism (HT) before and after achieving euthyroidism by short-term levothyroxine treatment. Levothyroxine treatment improves cardiovascular performance and ventricular remodeling in patients with HT, but diffuse myocardial injuries induced by HT are difficult to detect clinically. MATERIALS AND METHODS: Myocardial longitudinal relaxation time (T1 ) mapping using the modified Look-Locker inversion-recovery (MOLLI) sequences at 3...
March 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28322009/prognostic-importance-of-left-ventricular-mechanical-dyssynchrony-in-heart-failure-with-preserved-ejection-fraction
#14
Tor Biering-Sørensen, Sanjiv J Shah, Inder Anand, Nancy Sweitzer, Brian Claggett, Li Liu, Bertram Pitt, Marc A Pfeffer, Scott D Solomon, Amil M Shah
AIMS: Left ventricular mechanical dyssynchrony has been described in heart failure with preserved ejection fraction (HFpEF), but its prognostic significance is not known. METHODS AND RESULTS: Of 3445 patients with HFpEF enrolled in the Treatment of Preserved Cardiac Function Heart Failure with an Aldosterone Antagonist (TOPCAT) trial, dyssynchrony analysis was performed on 424 patients (12%) by multiple speckle tracking echocardiography strain-based criteria. The primary dyssynchrony analysis was the standard deviation of the time to peak longitudinal strain (SD T2P LS)...
March 21, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28321415/assessment-of-longitudinal-reproducibility-of-mice-lv-function-parameters-at-11-7%C3%A2-t-derived-from-self-gated-cine-mri
#15
Zhi Zuo, Anne Subgang, Alireza Abaei, Wolfgang Rottbauer, Detlef Stiller, Genshan Ma, Volker Rasche
The objective of this work was the assessment of the reproducibility of self-gated cardiac MRI in mice at ultra-high-field strength. A group of adult mice (n = 5) was followed over 360 days with a standardized MR protocol including reproducible animal position and standardized planning of the scan planes. From the resulting CINE MRI data, global left ventricular (LV) function parameters including end-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV), ejection fraction (EF), and left ventricular mass (LVM) were quantified...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28321000/the-effects-of-hydrogen-gas-inhalation-on-adverse-left-ventricular-remodeling-after-percutaneous-coronary-intervention-for-st-elevated-myocardial-infarction%C3%A3-first-pilot-study-in-humans
#16
Yoshinori Katsumata, Fumiya Sano, Takayuki Abe, Tomoyoshi Tamura, Taishi Fujisawa, Yasuyuki Shiraishi, Shun Kohsaka, Ikuko Ueda, Koichiro Homma, Masaru Suzuki, Shigeo Okuda, Yuichiro Maekawa, Eiji Kobayashi, Shingo Hori, Junichi Sasaki, Keiichi Fukuda, Motoaki Sano
BACKGROUND: Hydrogen gas inhalation (HI) reduced infarct size and mitigated adverse left ventricular (LV) remodeling in a rat model of acute myocardial infarction (AMI). We designed a prospective, open-label, rater-blinded clinical pilot study in patients experiencing ST-elevated MI (STEMI).Methods and Results:The 20 patients with an initial diagnosis of STEMI were assigned to either an HI group (1.3% H2with 26% oxygen) or a control group (26% oxygen). There were no HI-related severe adverse events...
March 17, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28320891/the-normal-ranges-of-cardiovascular-parameters-measured-using-the-ultrasonic-cardiac-output-monitor
#17
Giles N Cattermole, P Y Mia Leung, Grace Y L Ho, Peach W S Lau, Cangel P Y Chan, Stewart S W Chan, Brendan E Smith, Colin A Graham, Timothy H Rainer
The ultrasonic cardiac output monitor (USCOM) is a noninvasive transcutaneous continuous wave Doppler method for assessing hemodynamics. There are no published reference ranges for normal values in adults (aged 18-60 years) for this device. This study aimed to (1) measure cardiovascular indices using USCOM in healthy adults aged 18-60 years; (2) combine these data with those for healthy children (aged 0-12), adolescents (aged 12-18), and the elderly (aged over 60) from our previously published studies in order to present normal ranges for all ages, and (3) establish normal ranges of USCOM-derived variables according to both weight and age...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28320175/mechanical-embolectomy-for-acute-ischemic-stroke-beyond-six-hours-from-symptom-onset-using-mri-based-perfusion-imaging
#18
Ryan A McTaggart, Shadi Yaghi, Daniel C Sacchetti, Richard A Haas, Morgan Hemendinger, Daniel Arcuri, Jeffrey M Rogg, Karen L Furie, Mahesh V Jayaraman
INTRODUCTION: There is very limited data on the use of MRI based perfusion imaging to select patients with acute ischemic stroke and large vessel occlusion (LVO) for intraarterial therapy beyond 6h from onset. Our aim is to report the outcome of patients with acute ischemic stroke and large artery occlusion who presented beyond 6h from onset, had favorable MRI imaging profile, and underwent mechanical embolectomy. METHODS: This is a single institution (Rhode Island Hospital) retrospective study between December 1st, 2015, and July 30th, 2016 that included patients with acute ischemic stroke and proximal LVO with CT ASPECTS of 6 or more and 6-24h from symptom onset who were assessed for mechanical embolectomy using MRI based perfusion imaging...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28320070/dexpramipexole-improves-bioenergetics-and-outcome-in-experimental-stroke
#19
Mirko Muzzi, Elisabetta Gerace, Daniela Buonvicino, Elisabetta Coppi, Francesco Resta, Laura Formentini, Riccardo Zecchi, Laura Tigli, Daniele Guasti, Martina Ferri, Emidio Camaioni, Alessio Masi, Domenico E Pellegrini-Giampietro, Guido Mannaioni, Daniele Bani, Anna M Pugliese, Alberto Chiarugi
BACKGROUND AND PURPOSE: To investigate the effects of dexpramipexole, a drug recently tested in ALS patients able to bind F1Fo ATP synthase and increase mitochondrial ATP production, on experimental ischemic brain injury. EXPERIMENTAL APPROACH: The effects of dexpramipexole on bioenergetics, Ca(2+) fluxes, electrophysiological functions and death were evaluated in primary neural cultures and hippocampal slices exposed to oxygen-glucose deprivation (OGD). The drug's impact on infarct volumes and neurological functions was also evaluated in mice subjected to proximal or distal MCAo...
March 20, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28320068/thoracic-electrical-bioimpedance-versus-suprasternal-doppler-in-emergency-care
#20
Mohammed H Elwan, Jeremy Hue, Samira J Green, Salah M Eltahan, Mark R Sims, Timothy J Coats
OBJECTIVE: There are a number of cardiac output (CO) monitors that could potentially be used in the ED. Two of the most promising methods, thoracic electrical bioimpedance and suprasternal Doppler, have not been directly compared. The aim of this study was to investigate the feasibility of CO monitoring using suprasternal Doppler and bioimpedance in emergency care and compare haemodynamic data obtained from both monitors. METHODS: Haemodynamic measurements were made on the same group of patients using bioimpedance (Niccomo, Medis, Germany) and suprasternal Doppler (USCOM, Sydney, Australia)...
March 20, 2017: Emergency Medicine Australasia: EMA
keyword
keyword
23652
1
2
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"