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https://www.readbyqxmd.com/read/28935830/the-impact-of-artifact-correction-methods-of-rr-series-on-heart-rate-variability-parameters
#1
Anderson Ivan Rincon Soler, Luiz Eduardo Virgilio Silva, Rubens Fazan, Luiz Otavio Murta Junior
Heart rate variability (HRV) analysis is widely used to investigate the autonomic regulation of the cardiovascular system. HRV is often analyzed using RR time series, which can be affected by different types of artifacts. Although there are several artifact correction methods, there is no study that compares their performances in actual experimental contexts. This work aimed to evaluate the impact of different artifact correction methods on several HRV parameters. Initially, 36 ECG recordings of control rats or rats with heart failure or hypertension were analyzed to characterize artifacts occurrence rates and distributions, in order to be mimicked in simulations...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28931039/abnormalities-in-substance-p-neurokinin-1-receptor-binding-in-key-brainstem-nuclei-in-sudden-infant-death-syndrome-related-to-prematurity-and-sex
#2
Fiona M Bright, Robert Vink, Roger W Byard, Jhodie R Duncan, Henry F Krous, David S Paterson
Sudden infant death syndrome (SIDS) involves failure of arousal to potentially life threatening events, including hypoxia, during sleep. While neuronal dysfunction and abnormalities in neurotransmitter systems within the medulla oblongata have been implicated, the specific pathways associated with autonomic and cardiorespiratory failure are unknown. The neuropeptide substance P (SP) and its tachykinin neurokinin-1 receptor (NK1R) have been shown to play an integral role in the modulation of homeostatic function in the medulla, including regulation of respiratory rhythm generation, integration of cardiovascular control, and modulation of the baroreceptor reflex and mediation of the chemoreceptor reflex in response to hypoxia...
2017: PloS One
https://www.readbyqxmd.com/read/28924202/coupling-and-dynamics-of-cortical-and-autonomic-signals-are-linked-to-central-inhibition-during-the-wake-sleep-transition
#3
Christine Ulke, Jue Huang, Justus T C Schwabedal, Galina Surova, Roland Mergl, Tilman Hensch
Maintaining temporal coordination across physiological systems is crucial at the wake-sleep transition. As shown in recent studies, the degree of coordination between brain and autonomic arousal influences attention, which highlights a previously unrecognised point of potential failure in the attention system. To investigate how cortical and autonomic dynamics are linked to the attentive process we analysed electroencephalogram, electrocardiogram and skin conductance data of 39 healthy adults recorded during a 2-h resting-state oddball experiment...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28921803/the-pathophysiology-of-arterial-vasodilatation-and-hyperdynamic-circulation-in-cirrhosis
#4
Søren Møller, Flemming Bendtsen
Patients with cirrhosis and portal hypertension often develop complications from a variety of organ systems leading to a multiple organ failure. The combination of liver failure and portal hypertension result in a hyperdynamic circulatory state partly owing to simultaneous splanchnic and peripheral arterial vasodilatation. Increases in circulatory vasodilators are believed to be due to portosystemic shunting and bacterial translocation leading to redistribution of the blood volume with central hypovolemia. Portal hypertension per se and increased splanchnic blood flow are mainly responsible for the development and perpetuation of the hyperdynamic circulation and the associated changes in cardiovascular function with development of cirrhotic cardiomyopathy, autonomic dysfunction, and renal dysfunction as part of a cardiorenal syndrome...
September 16, 2017: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/28917022/epidemiology-pathogenesis-and-management-of-takotsubo-syndrome
#5
REVIEW
Shams Y-Hassan, Per Tornvall
Takotsubo syndrome is a recently recognized acute cardiac disease entity with a clinical presentation resembling that of an acute coronary syndrome. The typical takotsubo syndrome patient has a unique circumferential left (bi-) ventricular contraction abnormality profile that extends beyond a coronary artery supply territory and appears to follow the anatomical cardiac sympathetic innervation. The syndrome predominantly affects postmenopausal women and is often preceded by emotional or physical stress. Patients with predisposing factors such as malignancy and other chronic comorbidities are more prone to suffer from takotsubo syndrome...
September 15, 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/28916152/effects-of-inspiratory-muscle-training-on-cardiovascular-autonomic-control-a-systematic-review
#6
REVIEW
Raphael Martins de Abreu, Patrícia Rehder-Santos, Vinicius Minatel, Gabriela Lopes Dos Santos, Aparecida Maria Catai
PURPOSE: To carry out a systematic review to determine if inspiratory muscle training (IMT) promotes changes in cardiovascular autonomic responses in humans. METHODS: The methodology followed the PRISMA statement for reporting systematic review analysis. MEDLINE, PEDro, SCOPUS and PubMed electronic databases were searched from the inception to March 2017. The quality assessment was performed using a PEDro scale. The articles were included if: (1) primary objective was related to the effects of IMT on the cardiovascular autonomic nervous system, and (2) randomized clinical trials and quasi-experimental studies...
September 7, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28916122/myasthenia-gravis-and-crisis-evaluation-and-management-in-the-emergency-department
#7
Jamie Roper, M Emily Fleming, Brit Long, Alex Koyfman
BACKGROUND: Myasthenia gravis (MG) is an uncommon autoimmune disorder affecting the neuromuscular junction and manifesting as muscle weakness. A multitude of stressors can exacerbate MG. When symptoms are exacerbated, muscle weakness can be severe enough to result in respiratory failure, a condition known as myasthenic crisis (MC). OBJECTIVE: This review discusses risk factors, diagnosis, management, and iatrogenic avoidance of MC. DISCUSSION: MC can affect any age, ethnicity, or sex and can be precipitated with any stressor, infection being the most common...
September 12, 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28911152/hypothalamic-glucose-transport-in-humans-during-experimentally-induced-hypoglycemia-associated-autonomic-failure
#8
Elizabeth R Seaquist, Amir Moheet, Anjali Kumar, Dinesh K Deelchand, Melissa Terpstra, Kristine Kubisiak, Lynn E Eberly, Pierre-Gilles Henry, James M Joers, Gülin Öz
Context: Upregulated brain glucose transport in response to recurrent hypoglycemia may contribute to the development of hypoglycemia-associated autonomic failure (HAAF) and impaired awareness of hypoglycemia. Whether recurrent hypoglycemia alters glucose transport in the hypothalamus is unknown. Objective: To test the hypothesis that hypothalamic glucose transport will increase in healthy volunteers preconditioned with recurrent hypoglycemia to induce HAAF. Setting: University medical center...
September 1, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28904457/delayed-orthostatic-hypotension-a-pilot-study-from-india
#9
Arun Grace Roy, Siby Gopinath, Suresh Kumar, Sudheeran Kannoth, Anand Kumar
INTRODUCTION: Orthostatic hypotension is defined as a sustained decrease in systolic blood pressure of 20 mm Hg or a decrease in diastolic blood pressure of 10 mm Hg within three minutes of standing compared with blood pressure from the sitting or supine position or by head-up tilt-table testing (1). When sustained blood pressure (BP) drop is after three minutes of upright posture it is called delayed orthostatic hypotension (delayed OH) (2). AIM OF THE STUDY: To detect the incidence of delayed orthostatic hypotension in patients referred to our autonomic lab...
July 2017: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/28898335/-the-impact-of-a-self-directed-teaching-approach-on-academic-performance-of-medical-students
#10
Carolina Williams, Lucía Santelices, Mario Ávila, Mauricio Soto, Alberto Dougnac
BACKGROUND: Students should be encouraged to become reflexive and develop autonomous, lifelong learning habits. Therefore, teachers should focus on learning strategies which stimulate autonomous learning. AIM: To assess the impact of a self-directed teaching methodology on the academic performance of medical students in cellular biology and biochemistry. MATERIALS AND METHODS: During 2013, 85 students received a traditional teaching methodology and during 2014, 85 students received a self-directed learning methodology...
May 2017: Revista Médica de Chile
https://www.readbyqxmd.com/read/28889358/erratum-to-managing-neurogenic-orthostatic-hypotension-in-a-patient-presenting-with-pure-autonomic-failure-who-later-developed-parkinson-disease
#11
Fiona Gupta, Daniel Kremens, Steven Vernino, Beverly Karabin
No abstract text is available yet for this article.
September 9, 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/28885986/estimation-of-baroreflex-sensitivity-by-the-bivariate-phase-rectified-signal-averaging-method-a-comparison-with-the-phenylephrine-method
#12
Roberto Maestri, Maria Teresa La Rovere, Grzegorz Raczak, Ludmiła Danilowicz-Szymanowicz, Gian Domenico Pinna
Background A novel technique to assess spontaneous baroreflex sensitivity (BRS) by bivariate phase-rectified signal averaging (PRSA-BRS) has been recently proposed and its independent prognostic power demonstrated. This method, however, has never been compared with the Phenyleprine test (Phe-BRS), commonly regarded as the reference method in clinical and research applications. Methods In 192 heart failure (HF) and 41 post-myocardial infarction (post-MI) patients we compared PRSA-BRS with Phe-BRS, assessing both association and agreement...
September 8, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28884476/probiotics-for-preventing-urinary-tract-infection-in-people-with-neuropathic-bladder
#13
REVIEW
Swee-Ling Toh, Claire L Boswell-Ruys, Bon San B Lee, Judy M Simpson, Kate R Clezy
BACKGROUND: Neuropathic or neurogenic bladder describes a process of dysfunctional voiding as the result of injury in the brain, spinal cord or nerves innervating the bladder. People with neuropathic bladder, such as from spinal cord injury (SCI), are at significant risk of morbidity from urinary tract infections (UTI). Effective methods to prevent UTI in people with SCI have been sought for many years. Probiotics (micro-organisms that exert beneficial health effects in the host) have been recommended for bacterial interference of the urological tract to reduce colonisation by uropathogen and to manage the dual problems of infection and antibiotic resistance...
September 8, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28872781/armax-a-method-for-assessment-of-the-dynamic-response-of-the-arterial-baroreflex
#14
Morten T Lund, Max Salomonsson, Thomas E N Jonassen, Niels-Henrik Holstein-Rathlou
AIM: The baroreflex is a key mechanism in cardiovascular regulation and alterations in baroreceptor function are seen in many diseases, including heart failure, obesity and hypertension. We propose a new method for analyzing baroreceptor function from continuous blood pressure and heart rate in both health and disease. METHODS: 48-hour data series of blood pressure and heart rate were collected with telemetry. Sprague-Dawley rats on standard chow (n=11) served as controls, while rats on a high-fat, high-fructose diet (n=6) constituted the obese-hypertensive model...
September 5, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28867294/the-rna-m-6-a-reader-ythdf2-is-essential-for-the-post-transcriptional-regulation-of-the-maternal-transcriptome-and-oocyte-competence
#15
Ivayla Ivanova, Christian Much, Monica Di Giacomo, Chiara Azzi, Marcos Morgan, Pedro N Moreira, Jack Monahan, Claudia Carrieri, Anton J Enright, Dónal O'Carroll
YTHDF2 binds and destabilizes N(6)-methyladenosine (m(6)A)-modified mRNA. The extent to which this branch of m(6)A RNA-regulatory pathway functions in vivo and contributes to mammalian development remains unknown. Here we find that YTHDF2 deficiency is partially permissive in mice and results in female-specific infertility. Using conditional mutagenesis, we demonstrate that YTHDF2 is autonomously required within the germline to produce MII oocytes that are competent to sustain early zygotic development. Oocyte maturation is associated with a wave of maternal RNA degradation, and the resulting relative changes to the MII transcriptome are integral to oocyte quality...
September 21, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28864134/rationale-and-design-of-a-prospective-study-to-assess-the-effect-of-left-cardiac-sympathetic-denervation-in-chronic-heart-failure
#16
Ashley Chin, Mpiko Ntsekhe, Charle Viljoen, Johan Rossouw, Tim Pennel, Peter J Schwartz
BACKGROUND: The main causes of mortality in patients with chronic heart failure include sudden cardiac death (SCD) and progressive heart failure. Autonomic dysfunction plays a detrimental role in the progression of chronic heart failure. Left cardiac sympathetic denervation (LCSD) is an inexpensive and safe procedure which modifies autonomic innervation of the heart and is associated with a significant antifibrillatory effect. Whether LCSD reduces the risk of SCD, delays progression of heart failure and improves quality of life in patients with heart failure with reduced ejection fraction (HFrEF) is not known...
August 8, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28861330/a-plasma-cell-dyscrasia-presenting-as-amyloid-cardiomyopathy-and-autonomic-dysfunction-in-a-healthy-patient
#17
Rabih Tabet, Julie Zaidan, Boutros Karam, Samer Saouma, Foad Ghavami
Systemic amyloidosis is a rare multisystem disease caused by incorrectly folded proteins that deposit pathologically in different tissues and organs of the human body. It has a very wide spectrum of clinical presentations according to the affected organ(s), and its diagnosis is commonly delayed. Cardiac involvement is the leading cause of morbidity and mortality and carries a poor prognosis, especially in primary light chain amyloidosis. Therefore any delay in the diagnosis can result in devastating outcomes for the patient...
June 29, 2017: Curēus
https://www.readbyqxmd.com/read/28860330/recent-advances-in-neuropathology-biomarkers-and-therapeutic-approach-of-multiple-system-atrophy
#18
REVIEW
Shunsuke Koga, Dennis W Dickson
Multiple system atrophy (MSA) is a progressive neurodegenerative disorder characterised by a variable combination of autonomic failure, levodopa-unresponsive parkinsonism, cerebellar ataxia and pyramidal symptoms. The pathological hallmark is the oligodendrocytic glial cytoplasmic inclusion (GCI) consisting of α-synuclein; therefore, MSA is included in the category of α-synucleinopathies. MSA has been divided into two clinicopathological subtypes: MSA with predominant parkinsonism and MSA with predominant cerebellar ataxia, which generally correlate with striatonigral degeneration and olivopontocerebellar atrophy, respectively...
August 31, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28860128/opioid-receptor-activation-impairs-hypoglycemic-counterregulation-in-humans
#19
Michelle Carey, Rebekah Gospin, Akankasha Goyal, Nora Tomuta, Oana Sandu, Armand Mbanya, Eric Lontchi-Yimagou, Raphael Hulkower, Harry Shamoon, Ilan Gabriely, Meredith Hawkins
Although intensive glycemic control improves outcomes in type 1 diabetes mellitus, iatrogenic hypoglycemia limits its attainment. Recurrent and/or antecedent hypoglycemia causes blunting of protective counterregulatory responses, known as Hypoglycemia-Associated Autonomic Failure (HAAF). To determine whether and how opioid receptor activation induces HAAF in humans, twelve healthy, non-diabetic subjects (7M, age 32.3 ± 2.2 yr, BMI 25.1 ± 1.0 kg/m2) participated in two study protocols in random order over two consecutive days...
August 31, 2017: Diabetes
https://www.readbyqxmd.com/read/28857220/presuming-patient-autonomy-in-the-face-of-therapeutic-misconception
#20
Pat McConville
Therapeutic misconception involves the failure of subjects either to understand or to incorporate into their own expectations the distinctions in nature and purpose of personally responsive therapeutic care, and the generic relationship between subject and investigator which is constrained by research protocols. Researchers cannot disregard this phenomenon if they are to ensure that subjects engage in research on the basis of genuine informed consent. However, our presumption of patient autonomy must be sustained unless we have compelling evidence of serious misunderstanding...
August 30, 2017: Bioethics
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