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https://www.readbyqxmd.com/read/28107890/affective-impairment-in-chronic-low-blood-pressure
#1
Stefan Duschek, Alexandra Hoffmann, Gustavo A Reyes Del Paso
OBJECTIVE: Physical complaints such as faintness, dizziness, cold limbs and headaches have been well-established in chronic low blood pressure (hypotension). This study investigated the occurrence of adverse emotional states and the symptoms of depression in this condition. As autonomic dysregulation, particularly diminished sympathetic tone, is believed to be involved in the etiology of hypotension, the impact of different facets of autonomic cardiovascular control on mood and depressive symptoms was also explored...
February 2017: Journal of Psychosomatic Research
https://www.readbyqxmd.com/read/28103546/quantifying-net-synergy-redundancy-of-spontaneous-variability-regulation-via-predictability-and-transfer-entropy-decomposition-frameworks
#2
Alberto Porta, Vlasta Bari, Beatrice De Maria, Anielle C M Takahashi, Stefano Guzzetti, Riccardo Colombo, Aparecida M Catai, Ferdinando Raimondi, Luca Faes
OBJECTIVE: Indexes assessing the balance between redundancy and synergy were hypothesized to be helpful in characterizing cardiovascular control from spontaneous beat-to-beat variations of heart period (HP), systolic arterial pressure (SAP) and respiration (R). METHODS: Net redundancy/synergy indexes were derived according to predictability and transfer entropy decomposition strategies via a multivariate linear regression approach. Indexes were tested in two protocols inducing modifications of the cardiovascular regulation via baroreflex loading/unloading (i...
January 17, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28102901/risk-of-arrhythmic-death-in-ischemic-heart-disease-a-prospective-controlled-observer-blind-investigation-over-10-years
#3
Thomas Pezawas, André Diedrich, David Robertson, Robert Winker, Bernhard Richter, Li Wang, Herwig Schmidinger
BACKGROUND: Risk of arrhythmic death is considered highest in ischemic heart disease with severe left ventricular ejection fraction (LVEF) reduction. Non-invasive testing should improve decision-making of prophylactic defibrillator (ICD) implantation. METHODS AND RESULTS: We enrolled 120 patients with ischemic heart disease and LVEF <50% and 30 control subjects without ischemic heart disease and normal LVEF. An initial assessment, a second assessment after 3 years, and a final follow-up comprised of: pharmacological baroreflex testing (BRS), short-term spectral (low frequency (LF) to high frequency (HF) ratio) and long-term time domain analysis of heart rate variability (SDNN), exercise Microvolt T-wave alternans (MTWA) and others...
January 19, 2017: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28099586/serotoninergic-modulation-of-basal-cardiovascular-responses-and-responses-induced-by-isotonic-extracellular-volume-expansion-in-rats
#4
Isadora Ferraz Semionatto, Adrieli Oliveira Raminelli, Angelica Cristina Alves, Caroline Santos Capitelli, Rosangela Soares Chriguer
Background: Isotonic blood volume expansion (BVE) induced alterations of sympathetic and parasympathetic activity in the heart and blood vessels, which can be modulated by serotonergic pathways. Objective: To evaluate the effect of saline or serotonergic agonist (DOI) administration in the hypothalamic paraventricular nucleus (PVN) on cardiovascular responses after BVE. Methods: We recorded pulsatile blood pressure through the femoral artery to obtain the mean arterial pressure (MAP), systolic (SBP) and diastolic blood pressure (DBP), heart rate (HR) and the sympathetic-vagal ratio (LF/HF) of Wistar rats before and after they received bilateral microinjections of saline or DOI into the PVN, followed by BVE...
January 16, 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28095958/additive-effects-of-sinusoidal-lower-body-negative-pressure-on-cardiovascular-responses
#5
Keita Ishibashi, Fuyuki Oyama, Hisao Yoshida, Koichi Iwanaga
BACKGROUND: Sinusoidal lower body negative pressure (SLBNP) has been used to investigate the cardiovascular response to slow periodic changes in blood shifts, but measurements of slow fluctuations take a long time if measured for each period of SLBNP separately. Our study aimed to investigate whether the cardiovascular responses to superimposed SLBNP (S-SLBNP), which is expected to reduce the measurement time, are different from responses measured individually. METHODS: S-SLBNP was configured by superimposing two conventional SLBNPs (C-SLBNP) at 180-s and 30-s periods in the pressure range from 0 to -25 mmHg...
February 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28079146/nitrosative-stress-induced-disruption-of-baroreflex-neural-circuits-in-a-rat-model-of-hepatic-encephalopathy-a-dti-study
#6
Ching-Yi Tsai, Chia-Hao Su, Julie Y H Chan, Samuel H H Chan
The onset of hepatic encephalopathy (HE) in liver failure is associated with high mortality; the underlying mechanism is undecided. Here we report that in an acute liver failure model employing intraperitoneal administration of thioacetamide in Sprague-Dawley rats, diffusion weighted imaging revealed a progressive reduction in apparent diffusion coefficient in the brain stem. Diffusion tensor imaging further showed that the connectivity between nucleus tractus solitarii (NTS), the terminal site of baroreceptor afferents in brain stem and rostral ventrolateral medulla (RVLM), the origin of sympathetic innervation of blood vessels, was progressively disrupted until its disappearance, coincidental with the irreversible cessation of baroreflex-mediated sympathetic vasomotor tone signifying clinically the occurrence of brain death...
January 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28076450/time-course-of-changes-in-heart-rate-and-blood-pressure-variability-in-rats-with-myocardial-infarction
#7
R Aires, E B Pimentel, L Forechi, E M Dantas, J G Mill
Our aim was to determine the time course of changes in autonomic balance in the acute (1 and 3 days), sub-acute (7 days) and chronic (28 days) phases of myocardial infarction (MI) in rats. Autonomic balance was assessed by temporal and spectral analyses of blood pressure variability (BPV) and heart rate variability (HRV). Pulsatile blood pressure (BP) recordings (30 min) were obtained in awake and unrestrained male Wistar rats (N = 77; 8-10 weeks old) with MI (coronary ligature) or sham operation (SO). Data are reported as means±SE...
January 9, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28075709/the-influence-of-exercise-intensity-on-postexercise-baroreflex-sensitivity
#8
Linda J Reynolds, Mark B A De Ste Croix, David V B James
PURPOSE: The purpose of this study was to investigate the influence of exercise intensity on postexercise supine and tilt baroreflex sensitivity (BRS). METHOD: Nine healthy, active men performed 2 conditions of interval cycling of 40% maximal work rate (WRmax) and 75% WRmax of matched work done and a control condition of no exercise in a counterbalanced order. BRS outcome measures were determined at preexercise and postexercise up to +24 hr in supine and tilt positions...
January 11, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28065708/an-exploratory-propensity-score-matched-comparison-of-second-generation-and-first-generation-baroreflex-activation-therapy-systems
#9
Rolf Wachter, Marcel Halbach, George L Bakris, John D Bisognano, Hermann Haller, Joachim Beige, Abraham A Kroon, Mitra K Nadim, Eric G Lovett, Jill E Schafer, Peter W de Leeuw
Baroreflex activation therapy (BAT) is a device-based therapy for patients with treatment-resistant hypertension. In a randomized, controlled trial, the first-generation system significantly reduced blood pressure (BP) versus sham. Although an open-label validation study of the second-generation system demonstrated similar BP reductions, controlled data are not presently available. Therefore, this investigation compares results of first- and second-generation BAT systems. Two cohorts of first-generation BAT system patients were generated with propensity matching to compare against the validation group of 30 second-generation subjects...
December 16, 2016: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/28065687/restless-legs-syndrome-and-cardiovascular-disease-a-research-roadmap
#10
REVIEW
Daniel J Gottlieb, Virend K Somers, Naresh M Punjabi, John W Winkelman
In this paper, we first critically appraise the epidemiologic literature examining the association of restless legs syndrome (RLS) with cardiovascular disease (CVD) and then consider whether lessons learned from the study of cardiovascular consequences of other sleep disorders might inform a research agenda to examine the potential mechanisms of cardiovascular morbidity of RLS. Cross-sectional and longitudinal studies are both mixed as to whether there is a meaningful association of RLS and CVD. On the other hand, numerous cross-sectional and longitudinal observational studies have shown a strong association of obstructive sleep apnea (OSA) with CVD risk...
October 27, 2016: Sleep Medicine
https://www.readbyqxmd.com/read/28060537/variations-of-perioperative-baroreflex-sensitivity-in-hypertensive-and-normotensive-patients
#11
Dan Huang, Jie Zhou, Diansan Su, Weifeng Yu, Jie Chen
BACKGROUND: Impaired baroreflex sensitivity (BRS) is a marker of autonomous dysfunction, which may play an important role in the long-term development of hypertension. Perioperative patients with hypertension are rapidly increasing in all populations worldwide. OBJECTIVE: To estimate the value of BRS for hypertension in a surgery cohort. METHODS: An observational and cross-sectional study was performed, involving 96 patients who underwent video-assisted thoracoscopic pulmonary lobectomy or segmentectomy...
2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28057441/non-invasive-approach-for-the-assessment-of-sympathetic-baroreflex-function-a-feasibility-study
#12
Bartłomiej Paleczny, Agnieszka Siennicka, Piotr Ponikowski, Beata Ponikowska
BACKGROUND: Evaluation of sympathetic baroreflex (sBR) function in humans requires intra-neural recording of muscle sympathetic nerve activity (MSNA) by microneurography. AIMS: We proposed noninvasive approach for the evaluation of sBR function by applying the threshold-analysis (traditionally, based on MSNA) to systemic vascular resistance (SVR) measurement by photoplethysmography. METHODS & RESULTS: In nine healthy subjects (5M; age: 25±5y), the threshold-analysis was calculated twice: using MSNA and SVR...
December 29, 2016: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28055999/-role-of-the-sympathetic-nervous-system-in-vasovagal-syncope-and-rationale-for-beta-blockers-and-norepinephrine-transporter-inhibitors
#13
Manlio F Márquez, Jorge Rafael Gómez-Flores, Jesús A González-Hermosillo, Teresita de Jesús Ruíz-Siller, Manuel Cárdenas
Vasovagal or neurocardiogenic syncope is a common clinical situation and, as with other entities associated with orthostatic intolerance, the underlying condition is a dysfunction of the autonomic nervous system. This article reviews various aspects of vasovagal syncope, including its relationship with orthostatic intolerance and the role of the autonomic nervous system in it. A brief history of the problem is given, as well as a description of how the names and associated concepts have evolved. The response of the sympathetic system to orthostatic stress, the physiology of the baroreflex system and the neurohumoral changes that occur with standing are analyzed...
December 29, 2016: Medwave
https://www.readbyqxmd.com/read/28045562/parasympathetic-baroreflexes-and-heart-rate-variability-during-acute-stage-of-sport-concussion-recovery
#14
Scott Bishop, Ryan Dech, Taylor Baker, Matthew Butz, Kaishan Aravinthan, J Patrick Neary
PRIMARY OBJECTIVE: To assess and compare the parasympathetic state of individuals in healthy vs concussion groups, by measuring cardiovascular metrics under resting and baroreflex conditions using a squat-stand manoeuvre. RESEARCH DESIGN: This was a retrospective mixed-method study, with participants who sustained a medically diagnosed sport concussion (n = 12), being tested within 72-hours post-injury. METHODS AND PROCEDURES: Participant's heart rate (Electrocardiogram, ECG) and blood pressure (finger plethysmography) data was collected during rest and during 10-second squat-stands (10SS, 0...
January 3, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28043809/physical-training-associated-with-enalapril-but-not-to-losartan-results-in-better-cardiovascular-autonomic-effects
#15
Karina Delgado Maida, Ada Clarice Gastaldi, Tabata de Paula Facioli, João Eduardo de Araújo, Hugo Celso Dutra de Souza
BACKGROUND: We investigated the cardiovascular autonomic effects of physical training associated with Enalapril or Losartan pharmacological treatments in spontaneously hypertensive rats (SHR). METHODS: SHRs, 18weeks of age (N=48) was assigned to either sedentary (N=24) and trained (N=24; aerobic training by swimming for 10wk). Each group was subdivided in 3 subgroups (N=8) vehicle (control); Enalapril (10mg·kg(-1)·d(-1)); and Losartan (5mg·kg(-1)·d(-1)). All animals received a 10-week treatment in drinking water...
December 24, 2016: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28043439/baroreflex-activation-therapy-for-patients-with-heart-failure-and-low-ejection-fraction-is-safe-and-effective
#16
EDITORIAL
Niv Ad
No abstract text is available yet for this article.
July 2016: Seminars in Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28043438/surgical-experience-and-long-term-results-of-baroreflex-activation-therapy-for-heart-failure-with-reduced-ejection-fraction
#17
Fred A Weaver, William T Abraham, William C Little, Christian Butter, Anique Ducharme, Marcel Halbach, Didier Klug, Eric G Lovett, Navid Madershahian, Jochen Müller-Ehmsen, Jill E Schafer, Michele Senni, Vijay Swarup, Rolf Wachter, Michael R Zile
The purpose of this publication is to describe the intraoperative experience along with long-term safety and efficacy of the second-generation baroreflex activation therapy (BAT) system in patients with heart failure (HF) and reduced ejection fraction HF (HFrEF). In a randomized trial of New York Heart Association Class III HFrEF, 140 patients were assigned 1:1 to receive BAT plus medical therapy or medical therapy alone. Procedural information along with safety and efficacy data were collected and analyzed over 12 months...
July 2016: Seminars in Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28011746/the-pharmacology-of-autonomic-failure-from-hypotension-to-hypertension
#18
REVIEW
Italo Biaggioni
Primary neurodegenerative autonomic disorders are characterized clinically by loss of autonomic regulation of blood pressure. The clinical picture is dominated by orthostatic hypotension, but supine hypertension is also a significant problem. Autonomic failure can result from impairment of central autonomic pathways (multiple system atrophy) or neurodegeneration of peripheral postganglionic autonomic fibers (pure autonomic failure, Parkinson's disease). Pharmacologic probes such as the ganglionic blocker trimethaphan can help us in the understanding of the underlying pathophysiology and diagnosis of these disorders...
January 2017: Pharmacological Reviews
https://www.readbyqxmd.com/read/28005704/the-antioxidant-effects-of-green-tea-reduces-blood-pressure-and-sympathoexcitation-in-an-experimental-model-of-hypertension
#19
Michelle L Garcia, Roberto B Pontes, Erika E Nishi, Flávia K Ibuki, Vanessa Oliveira, Alexandra C H Sawaya, Patrícia O Carvalho, Fernando N Nogueira, Maria do Carmo Franco, Ruy R Campos, Lila M Oyama, Cássia T Bergamaschi
BACKGROUND: Oxidative stress is a key mediator in the maintenance of sympathoexcitation and hypertension in human and experimental models. Green tea is widely known to be potent antioxidant. OBJECTIVE: We aimed to evaluate the effects of green tea in a model of hypertension. METHODS: Hypertension was induced by the nitric oxide synthase inhibitor [N-nitro-L-arginine-methyl-ester (L-NAME); 20 mg/kg per day, orally, for 2 weeks] in male Wistar rats...
February 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28005575/reduced-capacity-of-autonomic-and-baroreflex-control-associated-with-sleep-pattern-in-spontaneously-hypertensive-rats-with-a-nondipping-profile
#20
Chieh-Wen Chen, Terry B J Kuo, Chun-Yu Chen, Cheryl C H Yang
OBJECTIVE: Ambulatory blood pressure (BP) monitoring with a lack of nocturnal BP fall (BP nondipping) has been reported to be more prevalent among hypertensive populations and is a risk factor for cardiovascular disease than in patients with dipping pattern. However, its underlying mechanism is not fully understood. This study hypothesized that spontaneously hypertensive rats (SHRs) with a nondipping profile have an exaggerated disruption of both autonomic functioning and sleep compared with Wistar-Kyoto rats (WKYs) with a nondipping profile...
December 21, 2016: Journal of Hypertension
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