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Total 695 results found since Jan 2013.

Validation of stroke volume and cardiac output by electrical interrogation of the brachial artery in normals: assessment of strengths, limitations, and sources of error
Abstract The goal of this study is to validate a new, continuous, noninvasive stroke volume (SV) method, known as transbrachial electrical bioimpedance velocimetry (TBEV). TBEV SV was compared to SV obtained by cardiac magnetic resonance imaging (cMRI) in normal humans devoid of clinically apparent heart disease. Thirty-two (32) volunteers were enrolled in the study. Each subject was evaluated by echocardiography to assure that no aortic or mitral valve disease was present. Subsequently, each subject underwent electrical interrogation of the brachial artery by means of a high frequency, low amplitude alternating c...
Source: Journal of Clinical Monitoring and Computing - February 14, 2015 Category: Information Technology Source Type: research

EEG-NIRS Based Assessment of Neurovascular Coupling During Anodal Transcranial Direct Current Stimulation - a Stroke Case Series
In this study, the hemodynamic response was estimated with NIRS. NIRS recorded changes in oxy-hemoglobin (HbO2) and deoxy-hemoglobin (Hb) concentrations during anodal tDCS-induced activation of the cortical region located under the electrode and in-between the light sources and detectors. Anodal tDCS-induced alterations in the underlying neuronal current generators were also captured with EEG. Then, a method for the assessment of NVC underlying the site of anodal tDCS was proposed that leverages the Hilbert-Huang Transform. The case series including four chronic (>6 months) ischemic stroke survivors (3 males, 1 female ...
Source: Journal of Medical Systems - February 17, 2015 Category: Information Technology Source Type: research

Influences of different vasopressors on stroke volume variation and pulse pressure variation
Abstract Pulse pressure variation (PPV) and stroke volume variation (SVV) during mechanical ventilation have been shown to be effective parameters to predict preload responsiveness. Although induced hypertension decreases PPV and SVV, the influences of different vasopressors on PPV and SVV are unknown. 94 patients undergoing elective otologic surgery were randomly divided into three groups: Group P (patients were given phenylephrine), Group D (patients were given dopamine), Group E (patients were given ephedrine). When surgery was ongoing and the circulation state was stable, patients were given the vasopressor to...
Source: Journal of Clinical Monitoring and Computing - March 26, 2015 Category: Information Technology Source Type: research

Diagnostic accuracy of stroke volume variation measured with uncalibrated arterial waveform analysis for the prediction of fluid responsiveness in patients with impaired left ventricular function: a prospective, observational study
Abstract Uncalibrated arterial waveform analysis enables dynamic preload assessment in a minimally invasive fashion. Evidence about the validity of the technique in patients with impaired left ventricular function is scarce, while adequate cardiac preload assessment would be of great value in these patients. The aim of this study was to investigate the diagnostic accuracy of stroke volume variation (SVV) measured with the FloTrac/Vigileo™ system in patients with impaired left ventricular function. In this prospective, observational study, 22 patients with a left ventricular ejection fraction of 40 % or less und...
Source: Journal of Clinical Monitoring and Computing - July 31, 2015 Category: Information Technology Source Type: research

Evaluation of Quality, Content, and Use of the Web Site Prepared for Family Members Giving Care to Stroke Patients
This study was designed to evaluate the quality, content, usability, and efficacy of a Web site prepared for the purpose of improving the caregiving capability of family members who provide care for stroke survivors at home. The DISCERN score for the Web site was found to be 4.35 over 5. The first section that assesses reliability of the Web site was 4.38 over 5; mean score of the second section that measures the quality of the provided information on treatment/care options was 4.30, and mean score of the third section that gives a general evaluation of the material was 4.1. The Web site content achieved an average score o...
Source: CIN: Computers, Informatics, Nursing - September 1, 2015 Category: Information Technology Tags: Feature Articles Source Type: research

The effect of head up tilting on bioreactance cardiac output and stroke volume readings using suprasternal transcutaneous Doppler as a control in healthy young adults
Abstract To compare the performance of a bioreactance cardiac output (CO) monitor (NICOM) and transcutaneous Doppler (USCOM) during head up tilting (HUT). Healthy young adult subjects, age 22 ± 1 years, 7 male and 7 female, were tilted over 3–5 s from supine to 70° HUT, 30° HUT and back to supine. Positions were held for 3 min. Simultaneous readings of NICOM and USCOM were performed 30 s into each new position. Mean blood pressure (MBP), heart rate (HR), CO and stroke volume (SV), and thoracic fluid content (TFC) were recorded. Bland–Altman, percentage changes and analysis of variance for repeated...
Source: Journal of Clinical Monitoring and Computing - February 12, 2016 Category: Information Technology Source Type: research

Switzerland's MindMaze gets $100M to bring virtual reality therapy for stroke patients to US
MindMaze, a Swiss company that uses virtual reality to help stroke victims through their recovery, has raised $100 million in funding to bring its product to the United States. The Hinduja Group, a global conglomerate that has invested since the company's early stages, led the round.
Source: mobihealthnews - February 17, 2016 Category: Information Technology Source Type: news

Comparison of stroke volumes assessed by three-dimensional echocardiography and transpulmonary thermodilution in a pediatric animal model
Abstract To compare stroke volumes (SV) in small hearts assessed by real-time three-dimensional echocardiography (3DE) with SV measured by transpulmonary thermodilution (TPTD) and continuous pulse contour analysis (PC) under various hemodynamic conditions. In thirteen anesthetized piglets (range 3.6–7.1 kg) SV were measured by 3DE, TPTD and PC at baseline and during phenylephrine and esmolol administration. 3DE and TPTD measurements were done successively while SV calculated by PC was documented at the time of 3DE. 3DE and TPTD showed a good correlation (r2 = 0.74) and a bias of −1.3 ml (limits of agreemen...
Source: Journal of Clinical Monitoring and Computing - February 17, 2016 Category: Information Technology Source Type: research

Utility of stroke volume variation measured using non-invasive bioreactance as a predictor of fluid responsiveness in the prone position
Abstract The aim of this prospective study was to evaluate the usefulness of stroke volume variation (SVV) derived from NICOM® to predict fluid responsiveness in the prone position. Forty adult patients undergoing spinal surgery in the prone position were included in this study. We measured SVV from NICOM® (SVVNICOM) and FloTrac™/Vigileo™ systems (SVVVigileo), and pulse pressure variation (PPV) using automatic (PPVauto) and manual (PPVmanual) calculations at four time points including supine and prone positions, and before and after fluid loading of 6 ml kg−1 colloid solution. Fluid responsiveness was de...
Source: Journal of Clinical Monitoring and Computing - March 10, 2016 Category: Information Technology Source Type: research

Effect of patent ductus arteriosus and patent foramen ovale on left ventricular stroke volume measurement by electrical velocimetry in comparison to transthoracic echocardiography in neonates
Abstract This prospective single-center observational study compared impedance cardiography [electrical velocimetry (EV)] with transthoracic echocardiography (TTE, based on trans-aortic flow) and analyzed the influence of physiological shunts, such as patent ductus arteriosus (PDA) or patent foramen ovale (PFO), on measurement accuracy. Two hundred and ninety-one triplicate simultaneous paired left ventricular stroke volume (LVSV) measurements by EV (LVSVEV) and TTE (LVSVTTE) in 99 spontaneously breathing neonates (mean weight 3270 g; range 1227–4600 g) were included. For the whole cohort, the mean absolute LV...
Source: Journal of Clinical Monitoring and Computing - April 11, 2016 Category: Information Technology Source Type: research

A novel method to assess pial collateralization from stroke perfusion MRI: subdividing Tmax into anatomical compartments.
CONCLUSIONS: Perfusion delay in the pial compartment, as evaluated by TMACS, closely reflects the extent of pial collaterals in gold-standard DSA. TMACS and mismatch ratio were found to be complementary predictors of a favourable clinical outcome, each adding independent predictive information. KEY POINTS: • MRI-DSC perfusion delay specific in the pial compartment reflects leptomeningeal collateralization. • A novel quantitative- and observer-independent marker of collateral status (TMACS) is introduced. • Quantification of collateral status leads to an independent predictor of neurological outcome. PMID: 2...
Source: Methods of Information in Medicine - May 23, 2016 Category: Information Technology Authors: Potreck A, Seker F, Hoffmann A, Pfaff J, Nagel S, Bendszus M, Heiland S, Pham M Tags: Eur Radiol Source Type: research

Dutch researchers working on sensor-enabled suit to monitor stroke recovery
Monitoring the everyday activity of people who have had a stroke is a challenge for doctors.
Source: mobihealthnews - December 1, 2016 Category: Information Technology Source Type: news

PatientPoint teams up with American Heart Association to offer heart and stroke health education at point of care
Cincinnati, Ohio based PatientPoint, which makes engagement platforms and apps for providers and patients, is collaborating with the American Heart Association to provide educational resources on heart health and stroke prevention to doctors and physicians at the point of care.
Source: mobihealthnews - January 12, 2017 Category: Information Technology Source Type: news

A novel method to assess pial collateralization from stroke perfusion MRI:  subdividing Tmax into anatomical compartments.
CONCLUSIONS: Perfusion delay in the pial compartment, as evaluated by TMACS, closely reflects the extent of pial collaterals in gold-standard DSA. TMACS and mismatch ratio were found to be complementary predictors of a favourable clinical outcome, each adding independent predictive information. KEY POINTS: • MRI-DSC perfusion delay specific in the pial compartment reflects leptomeningeal collateralization. • A novel quantitative- and observer-independent marker of collateral status (TMACS) is introduced. • Quantification of collateral status leads to an independent predictor of neurological outcome. PMID: 2...
Source: Methods of Information in Medicine - January 31, 2017 Category: Information Technology Authors: Potreck A, Seker F, Hoffmann A, Pfaff J, Nagel S, Bendszus M, Heiland S, Pham M Tags: Eur Radiol Source Type: research

Mind-Controlled Device Helps Stroke Patients Retrain Brains to Move Paralyzed Hands
Stroke patients who learned to use their minds to open and close a device fitted over their paralyzed hands gained some control over their hands, according to a new study from Washington University School of Medicine in St. Louis. By mentally controlling the device with the help of a brain-computer interface, participants trained the uninjured parts of their brains to take over functions previously performed by injured areas of the brain, the researchers said.
Source: eHealth News EU - May 30, 2017 Category: Information Technology Tags: Featured Research Research and Development Source Type: news