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https://www.readbyqxmd.com/read/28268475/a-multivariate-time-frequency-approach-for-tracking-qt-variability-changes-unrelated-to-heart-rate-variability
#1
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/28243824/do-we-need-to-evaluate-diastolic-blood-pressure-in-patients-with-suspected-orthostatic-hypotension
#2
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
#3
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/28226648/a-multivariate-time-frequency-approach-for-tracking-qt-variability-changes-unrelated-to-heart-rate-variability
#4
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
#5
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
#6
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/28188470/modeling-the-effect-of-tilting-passive-leg-exercise-and-functional-electrical-stimulation-on-the-human-cardiovascular-system
#7
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
#8
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
#9
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
#10
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/28113228/variability-of-ventricular-repolarization-dispersion-quantified-by-time-warping-the-morphology-of-the-t-waves
#11
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
#12
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
#13
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
https://www.readbyqxmd.com/read/28018240/distinctive-steady-state-heart-rate-and-blood-pressure-responses-to-passive-robotic-leg-exercise-and-functional-electrical-stimulation-during-head-up-tilt
#14
Amirehsan Sarabadani Tafreshi, Robert Riener, Verena Klamroth-Marganska
Introduction: Tilt tables enable early mobilization of patients by providing verticalization. But there is a high risk of orthostatic hypotension provoked by verticalization, especially after neurological diseases such as spinal cord injury. Robot-assisted tilt tables might be an alternative as they add passive robotic leg exercise (PE) that can be enhanced with functional electrical stimulation (FES) to the verticalization, thus reducing the risk of orthostatic hypotension. We hypothesized that the influence of PE on the cardiovascular system during verticalization (i...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27941082/parental-perceptions-of-pediatric-pain-and-pots-related-disability
#15
Elizabeth M Keating, Ryan M Antiel, Karen E Weiss, Dustin Wallace, Seth J Antiel, Philip R Fischer, Ashley N Junghans-Rutelonis, Cynthia Harbeck-Weber
Adolescents with postural orthostatic tachycardia syndrome (POTS) often have pain and functional impairment. This study evaluated how parental attributions of children's symptoms relate to child functional impairment. Adolescents with chronic pain and clinical symptoms suggestive of autonomic dysfunction (fatigue, dizziness, nausea) that attended a multidisciplinary chronic pain clinic completed measures of depression, anxiety, and functioning (n = 141). Parents of 114 of these patients completed the Parent Pain Attribution Questionnaire (PPAQ), a measure indicating the extent they believe physical and psychosocial factors account for their child's health condition...
December 8, 2016: Clinical Pediatrics
https://www.readbyqxmd.com/read/27909502/combined-diagnostic-yield-of-tilt-table-test-and-implantable-loop-recorder-to-identify-patients-affected-by-severe-clinical-presentation-of-neurally-mediated-reflex-syncope-who-could-respond-to-cardiac-pacing
#16
Tomaino M, Unterhuber M, Sgobino P, Pescoller F, Manfrin M, Rauhe W
In this study we wanted to verify the diagnostic value of tilt table test (TTT) to predict the efficacy of cardiac pacing (PM) for preventing recurrences of neurally mediated reflex syncope (NMS) in patients with cardioinhibitory activity (CI) documented by implantable loop recorder (ILR). Among patients selected by ILR in the context of severe clinical presentation of NMS, we analysed those who underwent PM implantation. In this observational and retrospective study we wanted to verify the results of TTT in the groups of treated patients with and without recurrences...
April 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27773421/dominant-transmission-observed-in-adolescents-and-families-with-orthostatic-intolerance
#17
Jennifer E Posey, Rebecca Martinez, Jeremy E Lankford, James R Lupski, Mohammed T Numan, Ian J Butler
BACKGROUND: Orthostatic intolerance is typically thought to be sporadic and attributed to cerebral autonomic dysfunction. We sought to identify families with inherited autonomic dysfunction manifest as symptomatic orthostatic intolerance to characterize mode of inheritance and clinical features. METHODS: Sixteen families with two or more first- or second-degree relatives with autonomic dysfunction and orthostatic intolerance were enrolled. A clinical diagnosis of autonomic dysfunction defined by symptomatic orthostatic intolerance diagnosed by head-up tilt table testing was confirmed for each proband...
January 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/27734180/assessment-of-autonomic-symptoms-in-a-medically-complex-urban-patient-population
#18
Jessica Robinson-Papp, Sandeep K Sharma, Mary Catherine George, David M Simpson
PURPOSE: Urban, minority communities are disproportionately affected by the chronic diseases associated with autonomic neuropathy; however validated measures of autonomic symptoms have not been studied in these complex populations. We sought to validate the Autonomic Symptom Profile (ASP) in a low income, medically complex, urban patient population. METHODS: Ninety-seven adults were recruited from the outpatient neurology clinic of an academic medical center serving the East Harlem neighborhood of New York City...
February 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/27730767/cardiovascular-autonomic-dysfunction-in-patients-with-drug-induced-parkinsonism
#19
Joong Seok Kim, Dong Woo Ryu, Ju Hee Oh, Yang Hyun Lee, Sung Jin Park, Kipyung Jeon, Jong Yun Lee, Seong Hee Ho, Jungmin So, Jin Hee Im, Kwang Soo Lee
BACKGROUND AND PURPOSE: Recent studies have shown that several nonmotor symptoms differ between Parkinson's disease (PD) and drug-induced parkinsonism (DIP). However, there have been no reports on cardiovascular autonomic function in DIP, and so this study investigated whether cardiovascular autonomic function differs between PD and DIP patients. METHODS: This study consecutively enrolled 20 DIP patients, 99 drug-naïve PD patients, and 25 age-matched healthy controls who underwent head-up tilt-table testing and 24-h ambulatory blood pressure monitoring...
January 2017: Journal of Clinical Neurology
https://www.readbyqxmd.com/read/27632862/comparison-of-hip-and-back-muscle-activity-and-pelvic-compensation-in-healthy-subjects-during-three-different-prone-table-hip-extension-exercises
#20
In-Cheol Jeon, Oh-Yun Kwon, Jong-Hyuck Weon, Ui-Jae Hwang, Sung-Hoon Jung
CONTEXT: Prone hip extension has been recommended for strengthening the back and hip muscles. Previous studies have investigated prone hip extension conducted with subjects on the floor in the prone position. However, no study has compared three different table hip extension (THE) positions in terms of the activities of the back and hip joint muscles with lumbopelvic motion. OBJECTIVE: This study sought to identify more effective exercises for strengthening the gluteus maximus (GM) by comparing three different exercises [THE alone, THE with the abdominal drawing-in maneuver (THEA), and THEA with chair support under the knee (THEAC)] based on electromyographic muscle activity and pelvic compensation...
August 24, 2016: Journal of Sport Rehabilitation
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