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https://www.readbyqxmd.com/read/28339438/the-role-of-autonomic-function-in-exercise-induced-endogenous-analgesia-a-case-control-study-in-myalgic-encephalomyelitis-chronic-fatigue-syndrome-and-healthy-people
#1
Jessica Van Oosterwijck, Uros Marusic, Inge De Wandele, Lorna Paul, Mira Meeus, Greta Moorkens, Luc Lambrecht, Lieven Danneels, Jo Nijs
BACKGROUND: Patients with myalgic encephalomyelitis / chronic fatigue syndrome (ME/CFS) are unable to activate brain-orchestrated endogenous analgesia (or descending inhibition) in response to exercise. This physiological impairment is currently regarded as one factor explaining post-exertional malaise in these patients. Autonomic dysfunction is also a feature of ME/CFS. OBJECTIVES: This study aims to examine the role of the autonomic nervous system in exercise-induced analgesia in healthy people and those with ME/CFS, by studying the recovery of autonomic parameters following aerobic exercise and the relation to changes in self-reported pain intensity...
March 2017: Pain Physician
https://www.readbyqxmd.com/read/28324975/quantification-of-peripheral-and-central-blood-pressure-variability-using-a-time-frequency-method
#2
Z Kouchaki, M Butlin, A Qasem, A P Avolio
Systolic blood pressure variability (BPV) is associated with cardiovascular events. As the beat-to-beat variation of blood pressure is due to interaction of several cardiovascular control systems operating with different response times, assessment of BPV by spectral analysis using the continuous measurement of arterial pressure in the finger is used to differentiate the contribution of these systems in regulating blood pressure. However, as baroreceptors are centrally located, this study considered applying a continuous aortic pressure signal estimated noninvasively from finger pressure for assessment of systolic BPV by a time-frequency method using Short Time Fourier Transform (STFT)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28320856/sustained-reduction-of-blood-pressure-with-baroreceptor-activation-therapy-results-of-the-6-year-open-follow-up
#3
Peter W de Leeuw, John D Bisognano, George L Bakris, Mitra K Nadim, Hermann Haller, Abraham A Kroon
Baroreflex activation therapy is a novel technique for treating patients with resistant hypertension. Although short-term studies have demonstrated that it lowers blood pressure, long-term results have not yet been reported. The aim of the present study is to assess the long-term efficacy and safety of baroreflex activation therapy. Long-term follow-up data were analyzed from all patients who had been included in 1 of the 3 trials that focused on treatment-resistant hypertensive patients. Altogether, 383 patients were available for analysis: 143 of these had completed 5 years of follow-up and 48 patients had completed 6 years of follow-up...
March 20, 2017: Hypertension
https://www.readbyqxmd.com/read/28283496/physical-activity-guided-by-pulse-pressure-in-patients-with-continuous-flow-left-ventricular-assist-devices-a-pilot-study
#4
Sven Haufe, Christoph Bara, Julian Eigendorf, Kristine Chobanyan-Jürgens, Sebastian V Rojas, Jan D Schmitto, Uwe Tegtbur, Jens Jordan, Jens Tank
Continuous flow left ventricular assist devices (cfLVADs) are increasingly used as bridge to cardiac transplantation or destination therapy in patients with end-stage heart failure.(1) Patients implanted with cfLVADs exhibit marked arterial pulse pressure (PP) reductions which could adversely affect cardiovascular health. Indeed, a pulsatile blood pressure provides stimuli for vascular smooth muscle cell growth and arterial baroreceptor functions.(2, 3) LVAD designs attempting to simulate PP have been developed recently with the hope to improve clinical outcomes...
March 10, 2017: Circulation
https://www.readbyqxmd.com/read/28280470/acute-effect-of-central-administration-of-urotensin-ii-on-baroreflex-and-blood-pressure-in-conscious-normotensive-rabbits
#5
Kyungjoon Lim, Yusuke Sata, Kristy L Jackson, Sandra L Burke, Geoffrey A Head
In the present study, we examined the effects of central administration of Urotensin II on blood pressure, heart rate, and baroreceptor heart rate reflexes in conscious normotensive rabbits. Preliminary operations were undertaken to implant a balloon cuff on the inferior vena cava for baroreflex assessments and to implant cannula into the lateral and fourth ventricle. After 2 weeks of recovery cumulative dose response curves to Urotensin II (10, 100 ng, 1, 10, and 100 μg) given into the ventricles, or Ringer's solution as a vehicle were performed on separate days...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28270593/reduced-responses-to-glutamate-receptor-agonists-follow-loss-of-astrocytes-and-astroglial-glutamate-markers-in-the-nucleus-tractus-solitarii
#6
William T Talman, Deidre Nitschke Dragon, Li-Hsien Lin
Saporin (SAP) or SAP conjugates injected into the nucleus tractus solitarii (NTS) of rats kill astrocytes. When injected in its unconjugated form, SAP produces no demonstrable loss of or damage to local neurons. However bilateral injections of SAP significantly attenuate responses to activation of baroreceptor reflexes that are mediated by transmission of signals through glutamate receptors in the NTS We tested the hypothesis that SAP would reduce cardiovascular responses to activation of NTS glutamate receptors despite its recognized ability to spare local neurons while killing local astrocytes...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28269522/analysis-of-a-cardiovascular-model-for-the-study-of-the-autonomic-response-of-brugada-syndrome-patients
#7
Mireia Calvo, Virginie Le Rolle, Daniel Romero Perez, Nathalie Behar, Pedro Gomis, Philippe Mabo, Alfredo I Hernandez
This paper describes the integration of mathematical models of the cardiac electrical activity, the cardiovascular system and the baroreceptor reflex control of the autonomic nervous system, with a model representing a head-up tilt test. Sensitivity analyses are performed in order to determine those model parameters producing the greatest significant effects on heart rate and blood pressure. An optimization step is then applied to the most influential parameters in order to find the best model fit to real cardiac data obtained from a patient suffering from Brugada syndrome and a healthy subject, in supine and upright postures during a tilt test...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268070/post-carotid-endarterectomy-hypertension-part-1-association-with-pre-operative-clinical-imaging-and-physiological-parameters
#8
J E Newman, M J Bown, R D Sayers, J P Thompson, T G Robinson, B Williams, R Panerai, P Lacy, A R Naylor
OBJECTIVE/BACKGROUND: Post-endarterectomy hypertension (PEH) is a well recognised, but poorly understood, phenomenon after carotid endarterectomy (CEA) that is associated with post-operative intracranial haemorrhage, hyperperfusion syndrome, and cardiac complications. The aim of the current study was to identify pre-operative clinical, imaging, and physiological parameters associated with PEH. METHODS: In total, 106 CEA patients undergoing CEA under general anaesthesia underwent pre-operative evaluation of 24 hour ambulatory arterial blood pressure (BP), baroreceptor sensitivity, cerebral autoregulation, and transcranial Doppler measurement of cerebral blood flow velocity (CBFv) and pulsatility index...
March 3, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28267039/blood-pressure-after-blinded-randomized-withdrawal-and-resumption-of-baroreceptor-activating-therapy
#9
Joachim Beige, Theresa Jentzsch, Ralph Wendt, Gert Hennig, Michael Koziolek, Manuel Wallbach
BACKGROUND: Baroreceptor-activating therapy (BAT) has been shown to control resistant hypertension in one sham-controlled and further observational studies. Incremental but significant reincrease of blood pressure (BP) have been described after open-label temporary withdrawal of such therapy. METHOD: Our study in 16 randomized patients investigated the course of automated office, ambulatory, and home BP in a randomized, controlled cross-over design. RESULTS: After 4 weeks of blinded and randomized withdrawal in hypertension-controlled long-term carriers of BAT (2...
March 6, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28261799/baroreflex-control-of-renal-sympathetic-nerve-activity-in-early-heart-failure-assessed-by-the-sequence-method
#10
Renata Maria Lataro, Luiz Eduardo Virgilio Silva, Carlos Alberto Aguiar Silva, Helio Cesar Salgado, Rubens Fazan
In heart failure (HF), the reflex control of the heart rate is known to be markedly impaired; however, the baroreceptor control of the sympathetic drive remains under debate. Applying the sequence method to a series of arterial pressure (AP) and renal sympathetic nerve activity (RSNA), we demonstrated a clear dysfunction in the baroreflex control of sympathetic activity in rats with early HF. We analysed the baroreflex control of the sympathetic drive using three different approaches: AP vs. RSNA curve, cross-spectral analysis and sequence method between AP and RSNA...
March 6, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28245992/overt-and-subclinical-baroreflex-dysfunction-following-bilateral-carotid-body-tumor-resection-pathophysiology-diagnosis-and-implications-for-management
#11
REVIEW
Michael G Z Ghali, Visish M Srinivasan, Ehab Hanna, Franco DeMonte
Carotid body paragangliomas are rare, usually benign, tumors arising from glomus cells of the carotid body. Bilateral involvement is present in ∼5% of sporadic cases and up to one-third of familial cases. In the majority of patients undergoing bilateral resection of carotid body tumors (CBTs), a condition known as baroreflex failure syndrome (BFS) develops following resection of the second tumor characterized by headache, anxiety, emotional lability, orthostatic lightheadedness, hypertension, and tachycardia...
February 25, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28229200/-current-impact-of-cardiac-implantable-electronic-devices
#12
J Kuschyk, B Rudic, M Borggrefe, I Akin
Sudden cardiac death and chronic heart failure are among the main contributors to persisting high mortality rates in Germany. In addition to removal of causal factors and guideline-conform pharmacological therapy, therapy with cardiac implantable electronic devices (CIED) is of undisputed importance. Subcutaneous defibrillators have the advantage that they do not have intracardiac electrodes but still have the same efficacy and safety. For patients with a wide QRS complex and reduced ejection fraction, cardiac resynchronization has led to a reduction of morbidity and mortality...
February 22, 2017: Herz
https://www.readbyqxmd.com/read/28227777/analysis-of-a-cardiovascular-model-for-the-study-of-the-autonomic-response-of-brugada-syndrome-patients
#13
Mireia Calvo, Virginie Le Rolle, Daniel Romero Perez, Nathalie Behar, Pedro Gomis, Philippe Mabo, Alfredo I Hernandez, Mireia Calvo, Virginie Le Rolle, Daniel Romero Perez, Nathalie Behar, Pedro Gomis, Philippe Mabo, Alfredo I Hernandez, Mireia Calvo, Daniel Romero Perez, Pedro Gomis, Philippe Mabo, Nathalie Behar, Alfredo I Hernandez, Virginie Le Rolle
This paper describes the integration of mathematical models of the cardiac electrical activity, the cardiovascular system and the baroreceptor reflex control of the autonomic nervous system, with a model representing a head-up tilt test. Sensitivity analyses are performed in order to determine those model parameters producing the greatest significant effects on heart rate and blood pressure. An optimization step is then applied to the most influential parameters in order to find the best model fit to real cardiac data obtained from a patient suffering from Brugada syndrome and a healthy subject, in supine and upright postures during a tilt test...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227135/quantification-of-peripheral-and-central-blood-pressure-variability-using-a-time-frequency-method
#14
Z Kouchaki, M Butlin, A Qasem, A P Avolio, Z Kouchaki, M Butlin, A Qasem, A P Avolio, Z Kouchaki, A P Avolio, M Butlin, A Qasem
Systolic blood pressure variability (BPV) is associated with cardiovascular events. As the beat-to-beat variation of blood pressure is due to interaction of several cardiovascular control systems operating with different response times, assessment of BPV by spectral analysis using the continuous measurement of arterial pressure in the finger is used to differentiate the contribution of these systems in regulating blood pressure. However, as baroreceptors are centrally located, this study considered applying a continuous aortic pressure signal estimated noninvasively from finger pressure for assessment of systolic BPV by a time-frequency method using Short Time Fourier Transform (STFT)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28196652/simulation-of-fetal-heart-rate-variability-with-a-mathematical-model
#15
Germaine J L M Jongen, M Beatrijs van der Hout-van der Jagt, S Guid Oei, Frans N van de Vosse, Peter H M Bovendeerd
In the clinic, the cardiotocogram (CTG), the combined registration of fetal heart rate (FHR) and uterine contractions, is used to predict fetal well-being. Amongst others, fetal heart rate variability (FHRV) is an important indicator of fetal distress. In this study we add FHRV to our previously developed CTG simulation model, in order to improve its use as a research and educational tool. We implemented three sources of variability by applying either 1/f or white noise to the peripheral vascular resistance, baroreceptor output, or efferent vagal signal...
February 11, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28181735/the-innervation-of-the-kidney-in-renal-injury-and-inflammation-a-cause-and-consequence-of-deranged-cardiovascular-control
#16
REVIEW
Mohammed H Abdulla, Edward J Johns
Extensive investigations have revealed that renal sympathetic nerves regulate renin secretion, tubular fluid reabsorption and renal haemodynamics which can impact on cardiovascular homoeostasis normally and in pathophysiological states. The significance of the renal afferent innervation and its role in determining the autonomic control of the cardiovascular system is uncertain. The transduction pathways at the renal afferent nerves have been shown to require pro-inflammatory mediators and TRPV1 channels. Reno-renal reflexes have been described, both inhibitory and excitatory, demonstrating that a neural link exists between kidneys and may determine the distribution of excretory and haemodynamic function between the two kidneys...
February 9, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28165137/preclinical-safety-assessments-of-nano-sized-constructs-on-cardiovascular-system-toxicity-a-case-for-telemetry
#17
REVIEW
Hoay Yan Cheah, Lik Voon Kiew, Hong Boon Lee, Nina Japundžić-Žigon, Marίa J Vicent, See Ziau Hoe, Lip Yong Chung
While nano-sized construct (NSC) use in medicine has grown significantly in recent years, reported unwanted side effects have raised safety concerns. However, the toxicity of NSCs to the cardiovascular system (CVS) and the relative merits of the associated evaluation methods have not been thoroughly studied. This review discusses the toxicological profiles of selected NSCs and provides an overview of the assessment methods, including in silico, in vitro, ex vivo and in vivo models and how they are related to CVS toxicity...
February 6, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28111704/bidirectional-cardiovascular-responses-evoked-by-microstimulation-of-the-amygdala-in-rats
#18
Ko Yamanaka, Miwa Takagishi, Jimmy Kim, Sabine S Gouraud, Hidefumi Waki
Although the amygdala is known as a negative emotion center for coordinating defensive behaviors, its functions in autonomic control remain unclear. To resolve this issue, we examined effects on cardiovascular responses induced by stimulation and lesions of the amygdala in anesthetized and free-moving rats. Electrical microstimulation of the central nucleus of the amygdala (CeA) induced a gradual increase in arterial pressure (AP) and heart rate (HR), whereas stimulation of adjacent nuclei evoked a phasic AP decrease...
January 23, 2017: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/28104014/-individualized-treatment-of-bilateral-carotid-body-tumor
#19
Y R Feng, X H Chen, X J Kou, Y L Bai, F Q Lu, J Yang, B C Wang
Objective: To investigate individualized therapeutic strategy for bilateral carotid body tumors. Methods: Clinical data of 16 patients with bilateral carotid body tumor treated from January 2003 to August 2016 were retrospectively studied. Of the 16 patients, 9 were males and 7 were females; 5 were sporadic and 11 were familial; 8 cases were observed, 1 cases was malignant and treated with chemotherapy, and 7 cases were treated with surgery. The treatment course, perioperative complications and clinical efficacy were assessed...
January 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/28094772/cardiac-afferent-activity-modulates-the-expression-of-racial-stereotypes
#20
Ruben T Azevedo, Sarah N Garfinkel, Hugo D Critchley, Manos Tsakiris
Negative racial stereotypes tend to associate Black people with threat. This often leads to the misidentification of harmless objects as weapons held by a Black individual. Yet, little is known about how bodily states impact the expression of racial stereotyping. By tapping into the phasic activation of arterial baroreceptors, known to be associated with changes in the neural processing of fearful stimuli, we show activation of race-threat stereotypes synchronized with the cardiovascular cycle. Across two established tasks, stimuli depicting Black or White individuals were presented to coincide with either the cardiac systole or diastole...
January 17, 2017: Nature Communications
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