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https://www.readbyqxmd.com/read/28283666/clinical-parameters-and-adrenocortical-activity-to-assess-stress-responses-of-alpacas-using-different-methods-of-restraint-either-alone-or-with-shearing
#1
T Wittek, T Salaberger, R Palme, S Becker, F Hajek, B Lambacher, S Waiblinger
Shearing of alpacas is stressful and is undertaken by restraint in the standing position, cast on the floor or on a tilt table. The objectives of the study were to evaluate and compare the stress responses between different methods. The study consisted of two parts. In part one, 15 animals were restrained applying all three methods but without shearing. In part two, 45 animals in three groups of 15 were shorn using one of the three procedures. Body temperature, heart rate, respiratory rate, salivary cortisol and faecal cortisol metabolites (FCM) were measured...
March 10, 2017: Veterinary Record
https://www.readbyqxmd.com/read/28268477/disentanglement-of-sympathetic-and-parasympathetic-activity-by-instantaneous-analysis-of-human-heartbeat-dynamics
#2
Gaetano Valenza, Luca Citi, Riccardo Barbieri
Spectral analysis of heart rate variability (HRV) is one of the most effective techniques for the assessment of the influence of the autonomic nervous system (ANS) on the heartbeat. Despite its widespread use, it has been demonstrated that HRV subdivision in the low frequency (LF) and high frequency (HF) bands does not accurately reflect separate sympathetic and parasympathetic influences, respectively, mainly due to overlap of the two branches in the low frequencies. Here we propose two novel indices, namely the instantaneous sympathetic autonomic index (SAI) and parasympathetic autonomic index (PAI), that are able to separately assess the time-varying ANS synergic functions...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268475/a-multivariate-time-frequency-approach-for-tracking-qt-variability-changes-unrelated-to-heart-rate-variability
#3
Michele Orini, Peter Taggart, Pier D Lambiase
The beat-to-beat variability of the QT interval (QTV) is a marker of ventricular repolarization (VR) dynamics and it has been suggested as an index of sympathetic ventricular outflow and cardiac instability. However, QTV is also affected by RR (or heart rate) variability (RRV), and QTV due to RRV may reduce QTV specificity as a VR marker. Therefore, it would be desirable to separate QTV due to VR dynamics from QTV due to RRV. To do that, previous work has mainly focused on heart rate corrections or time-invariant autoregressive models...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28243999/physiological-effects-of-early-incremental-mobilization-of-a-patient-with-acute-intracerebral-and-intraventricular-hemorrhage-requiring-dual-external-ventricular-drainage
#4
Sowmya Kumble, Elizabeth K Zink, Mackenzie Burch, Sandra Deluzio, Robert D Stevens, Mona N Bahouth
BACKGROUND: Recent trials have challenged the notion that very early mobility benefits patients with acute stroke. It is unclear how cerebral autoregulatory impairments, prevalent in this population, could be affected by mobilization. The safety of mobilizing patients who have external ventricular drainage (EVD) devices for cerebrospinal fluid diversion and intracranial pressure (ICP) monitoring is another concern due to risk of device dislodgment and potential elevation in ICP. We report hemodynamic and ICP responses during progressive, device-assisted mobility interventions performed in a critically ill patient with intracerebral hemorrhage (ICH) requiring two EVDs...
February 27, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/28243824/do-we-need-to-evaluate-diastolic-blood-pressure-in-patients-with-suspected-orthostatic-hypotension
#5
Artur Fedorowski, Viktor Hamrefors, Richard Sutton, J Gert van Dijk, Roy Freeman, Jacques Wm Lenders, Wouter Wieling
PURPOSE: The contribution of diastolic blood pressure measurement to the diagnosis of classical orthostatic hypotension is not known. We aimed to explore the prevalence of isolated systolic and diastolic orthostatic hypotension components in patients with syncope and orthostatic intolerance. METHODS: A total of 1520 patients aged >15 years with suspected syncope and/or symptoms of orthostatic intolerance were investigated in a tertiary center using tilt-table testing and continuous non-invasive blood pressure monitoring...
February 27, 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/28240408/tilt-table-testing-to-diagnose-pseudosyncope-in-the-pediatric-population
#6
Jeffrey A Robinson, Jill K Shivapour, Christopher S Snyder
OBJECTIVE: Pseudosyncope can be difficult to distinguish from true syncope. Often, pediatric patients with pseudosyncope undergo multiple tests and referrals before the appropriate diagnosis is reached. The purpose is to describe the utility of the head-up tilt table test to elicit the diagnosis of pseudosyncope in the pediatric population. DESIGN: Retrospective chart review from November 2012 to December 2015 of patients age ≤23 years referred for 30-minute, 80-degree tilt table test...
February 27, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28226650/disentanglement-of-sympathetic-and-parasympathetic-activity-by-instantaneous-analysis-of-human-heartbeat-dynamics
#7
Gaetano Valenza, Luca Citi, Riccardo Barbieri, Gaetano Valenza, Luca Citi, Riccardo Barbieri, Luca Citi, Riccardo Barbieri, Gaetano Valenza
Spectral analysis of heart rate variability (HRV) is one of the most effective techniques for the assessment of the influence of the autonomic nervous system (ANS) on the heartbeat. Despite its widespread use, it has been demonstrated that HRV subdivision in the low frequency (LF) and high frequency (HF) bands does not accurately reflect separate sympathetic and parasympathetic influences, respectively, mainly due to overlap of the two branches in the low frequencies. Here we propose two novel indices, namely the instantaneous sympathetic autonomic index (SAI) and parasympathetic autonomic index (PAI), that are able to separately assess the time-varying ANS synergic functions...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226648/a-multivariate-time-frequency-approach-for-tracking-qt-variability-changes-unrelated-to-heart-rate-variability
#8
Michele Orini, Peter Taggart, Pier D Lambiase, Michele Orini, Peter Taggart, Pier D Lambiase, Peter Taggart, Michele Orini, Pier D Lambiase
The beat-to-beat variability of the QT interval (QTV) is a marker of ventricular repolarization (VR) dynamics and it has been suggested as an index of sympathetic ventricular outflow and cardiac instability. However, QTV is also affected by RR (or heart rate) variability (RRV), and QTV due to RRV may reduce QTV specificity as a VR marker. Therefore, it would be desirable to separate QTV due to VR dynamics from QTV due to RRV. To do that, previous work has mainly focused on heart rate corrections or time-invariant autoregressive models...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225644/a-narrative-synthesis-of-nintendo-wii-fit-gaming-protocol-in-addressing-balance-among-healthy-older-adults-what-system-works
#9
Donald G Manlapaz, Gisela Sole, Prasath Jayakaran, Cathy M Chapple
BACKGROUND: Balance is crucial in performing functional tasks particularly among older adults. Exergaming is gaining attention as a novel approach to enhance balance in a number of clinical populations. OBJECTIVES: The aim of this review was to synthesize and present published evidence for Nintendo Wii Fit™ gaming system protocols. These include game preference, intervention setting, and exercise dosage for improving balance in healthy older adults. Commonly used outcome measures were also identified...
February 22, 2017: Games for Health
https://www.readbyqxmd.com/read/28217221/byung-gyu-kim-et-al-reduced-systemic-vascular-resistance-is-the-underlying-hemodynamic-mechanism-in-nitrate-stimulated-vasovagal-syncope-during-head-up-tilt-table-test
#10
Arttu Eräranta, Antti Tikkakoski, Ilkka H Pörsti
No abstract text is available yet for this article.
February 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28215591/the-effect-of-resuscitation-position-on-cerebral-and-coronary-perfusion-pressure-during-mechanical-cardiopulmonary-resuscitation-in-porcine-cardiac-arrest-model
#11
Taeyun Kim, Sang Do Shin, Kyoung Jun Song, Yong Joo Park, Hyun Ho Ryu, Guillaume Debaty, Keith Lurie, Ki Jeong Hong
OBJECTIVE: It is unknown whether patient position is associated with the optimal cerebral (CePP) and coronary (CoPP) perfusion pressure. METHODS: This study utilized a randomized experimental design and anesthetized, intubated and paralyzed female pigs (n=12) (mean 42, SD 3kg). After 6min of untreated ventricular fibrillation, mechanical CPR with was performed for 3min in 0° supine position. The CPR was then performed for 5min in a position randomly assigned to either 1) head-up tilt (HUT) by three angles (30°, 45°, or 60°) or 2) head-down tilt (HDT) by three angles (30°, 45°, or 60°) and at 3) supine position between HUT and HDT positions...
February 16, 2017: Resuscitation
https://www.readbyqxmd.com/read/28188470/modeling-the-effect-of-tilting-passive-leg-exercise-and-functional-electrical-stimulation-on-the-human-cardiovascular-system
#12
Amirehsan Sarabadani Tafreshi, Jan Okle, Verena Klamroth-Marganska, Robert Riener
Long periods of bed rest negatively affect the human body organs, notably the cardiovascular system. To avert these negative effects and promote functional recovery in patients dealing with prolonged bed rest, the goal is to mobilize them as early as possible while controlling and stabilizing their cardiovascular system. A robotic tilt table allows early mobilization by modulating body inclination, automated passive leg exercise, and the intensity of functional electrical stimulation applied to leg muscles (inputs)...
February 10, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28182163/which-is-preferable-for-orthostatic-hypotension-diagnosis-in-older-adults-active-standing-test-or-head-up-tilt-table-test
#13
Ali Ekrem Aydin, Pinar Soysal, Ahmet Turan Isik
BACKGROUND: Correct evaluation of orthostatic hypotension (OH) is crucial in geriatric practice, since OH is associated with mortality and morbidity. The study aimed to determine the most appropriate method for measuring blood pressure in transition from supine to upright position in order to diagnose OH in older adults. METHODS: Active standing test (AST) and head-up tilt table (HUT) test as well as comprehensive geriatric assessment (CGA), including mini-mental state examination or the cognitive state test, mini-nutritional assessment, basic and instrumental activities of daily living, and Tinetti performance-oriented mobility assessment indexes, were performed in 290 geriatric patients...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/28160388/cardiovascular-autonomic-dysfunction-in-ehlers-danlos-syndrome-hypermobile-type
#14
Alan Hakim, Chris O'Callaghan, Inge De Wandele, Lauren Stiles, Alan Pocinki, Peter Rowe
Autonomic dysfunction contributes to health-related impairment of quality of life in the hypermobile type of Ehlers-Danlos syndrome (hEDS). Typical signs and symptoms include tachycardia, hypotension, gastrointestinal dysmotility, and disturbed bladder function and sweating regulation. Cardiovascular autonomic dysfunction may present as Orthostatic Intolerance, Orthostatic Hypotension, Postural Orthostatic Tachycardia Syndrome, or Neurally Mediated Hypotension. The incidence, prevalence, and natural history of these conditions remain unquantified, but observations from specialist clinics suggest they are frequently seen in hEDS...
February 4, 2017: American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
https://www.readbyqxmd.com/read/28143709/arterial-hypertension-in-migraine-role-of-familial-history-and-cardiovascular-phenotype
#15
Laura Babayan, Oleg V Mamontov, Alexander V Amelin, Mikhail Bogachev, Alexei A Kamshilin
Recent studies indicate that migraine is associated with increased risk of cardiovascular diseases. However, links between autonomic cardiovascular regulation, arterial hypertension (AH) and migraine are still little explored. In this study, we evaluated autonomic regulation in migraine patients with and without hypertension. We studied 104 patients with migraine, aged 34±10 y, including 28 with and 76 without hypertension (M+AH and M-AH groups, respectively). The control group consisted of 88 healthy volunteers matched by age and sex...
January 25, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28134050/how-to-obtain-and-identify-the-acetabular-anterior-column-axial-view-projection-in-patients
#16
Xiaoreng Feng, Huijie Fan, Frankie Leung, Bin Chen
PURPOSE: This study aims at sharing our experience as how to obtain and identify axial view image of the acetabular anterior column in patients. METHODS: Pelvic computed tomography data of six normal adults were used to reconstruct three-dimensional (3D) models. The transparency of each 3D model was downgraded at the view perpendicular to the cross section of the anterior column axis to simulate the anterior column axial view image. Fluoroscopy was performed in all patients to obtain the anterior column axial view image in the operating room...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28114047/a-model-based-machine-learning-approach-to-probing-autonomic-regulation-from-nonstationary-vital-signs-time-series
#17
Li-Wei Lehman, Roger Mark, Shamim Nemati
Physiological variables, such as heart rate (HR), blood pressure (BP) and respiration (RESP), are tightly regulated and coupled under healthy conditions, and a break-down in the coupling has been associated with aging and disease. We present an approach that incorporates physiological modeling within a switching linear dynamical systems (SLDS) framework to assess the various functional components of the autonomic regulation through transfer function analysis of nonstationary multivariate time series of vital signs...
December 7, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28113228/variability-of-ventricular-repolarization-dispersion-quantified-by-time-warping-the-morphology-of-the-t-waves
#18
Julia Ramirez, Michele Orini, Derek Tucker, Esther Pueyo, Pablo Laguna
We propose two electrocardiogram (ECG)-derived markers of T-wave morphological variability in the temporal, dw , and amplitude, da , domains. Two additional markers, d(NL)w and d(NL)a , restricted to measure the non-linear information present within dw and da are also proposed. METHODS: We evaluated the accuracy of the proposed markers in capturing T-wave time and amplitude variations in 3 situations: (1) In a simulated set up with presence of additive Laplacian noise, (2) when modifying the spatio-temporal distribution of electrical repolarization with an electro-physiological cardiac model and (3) in ECG records from healthy subjects undergoing a tilt table test...
October 4, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28045689/racial-differences-in-response-to-tilt-table-testing-in-patients-refered
#19
Jameel Ahmed, Peerawut Deeprasertkul, Kevin M Monahan, Paul LeLorier
BACKGROUND: Syncope is a common problem in the general population and results in significant societal and patient costs. Several small studies have demonstrated differences in orthostatic response, and possibly tolerance, between blacks and whites. Based on these observations, we retrospectively reviewed results from our tilt table database to identify potential differences in response to tilt-table testing with regards to race, between black and white patients. METHODS: The reports of 446 tilt-table tests performed on adults, older than 18 years of age, at Boston Medical Center, an urban, tertiary-care, academic hospital, were reviewed...
November 2016: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28039767/static-otolithic-drive-alters-presynaptic-inhibition-in-soleus-motor-pool
#20
Apollonia Fox, David Koceja
The vestibular system has both direct and indirect connections to the soleus motor pool via the vestibulospinal and reticulospinal tracts. The exact nature of how this vestibular information is integrated within the spinal cord is largely unknown. The purpose of this study was to identify whether changes in static otolithic drive altered the amount of presynaptic inhibition in the soleus H-reflex pathway. Changes in static otolithic drive were investigated in sixteen healthy participants using a tilt table...
February 2017: Journal of Electromyography and Kinesiology
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