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https://www.readbyqxmd.com/read/28716819/effect-of-type-2-diabetes-surgical-incision-and-volatile-anesthesia-on-hemodynamics-in-the-rat
#1
Carol T Bussey, Regis R Lamberts
Diabetic patients have increased cardiac complications during surgery, possibly due to impaired autonomic regulation. Anesthesia lowers blood pressure and heart rate (HR), whereas surgical intervention has opposing effects. The interaction of anesthesia and surgical intervention on hemodynamics in diabetes is unknown, despite being a potential perioperative risk factor. We aimed to determine the effect of diabetes on the integrative interaction between hemodynamics, anesthesia, and surgical incision. Zucker type 2 diabetic rats (DM) and their nondiabetic littermates (ND) were implanted with an intravenous port for drug delivery, and a radiotelemeter to measure mean arterial blood pressure (MAP) and derive HR (total n = 50)...
July 2017: Physiological Reports
https://www.readbyqxmd.com/read/28716522/exercise-individualized-by-trimpi-method-reduces-arterial-stiffness-in-early-onset-type-2-diabetic-patients-a-randomized-controlled-trial-with-aerobic-interval-training
#2
Alfonso Bellia, Ferdinando Iellamo, Elisa De Carli, Aikaterini Andreadi, Elvira Padua, Mauro Lombardo, Giuseppe Annino, Francesca Campoli, Sara Tartaglione, Stefano D'Ottavio, David Della-Morte, Davide Lauro
BACKGROUND: Arterial stiffness (AS) and baroreflex sensitivity (BRS) are subclinical markers of vascular diseases in type 2 diabetes (T2D). We evaluated the effects of aerobic interval training (AIT), with loads prescribed according to individual heart rate and lactate profiling obtained during a baseline treadmill test (TRIMPi method), on AS and BRS in patients with early-onset T2D without cardiovascular complications. POPULATION STUDY AND METHODS: Twenty-two sedentary overweight T2D patients (aged 57±7years) were randomized to 12-weeks open-label of supervised AIT by TRIMPi (n=8) or unsupervised physical activity as per usual care (SOC) (n=11)...
June 17, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28707593/effects-of-some-indigenous-plants-of-north-karnataka-india-on-cardiovascular-and-glucose-regulatory-systems-in-diabetic-rats
#3
Kusal K Das, Kailash S Chadchan, R Chandramouli Reddy, M S Biradar, Pallavi S Kanthe, Bheemshetty S Pati, Jeevan G Ambekar, Ishwar B Bagoji, Swastika Das
BACKGROUND: The medicinal plants of north Karnataka, India are always researchers delight as many of these plants are rarely found in elsewhere other than this part of India. Kenaf leaves (Hibiscus cannabinus Linn, Pundi), Chick pea leaves (Cicer arietinum Linn, Chana) and Prickly lettuce leaves (Lactuca scariola Linn, Hattaraki.) are a few of these indigenous plants which are routinely consumed by the people as diet in this part of India. Various studies were done on these plants to find out some potential anti diabetic efficacies but reports are still not encouraging...
July 12, 2017: Cardiovascular & Hematological Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28699532/modulation-of-heart-rate-by-acute-or-chronic-aerobic-exercise-potential-effects-on-blood-pressure-control
#4
Carme Perez-Quilis, J Derek Kingsley, Kabir Malkani, Gianfranco Cervellin, Giuseppe Lippi, Fabian Sanchis-Gomar
It was initially assumed that heart rate and arterial blood pressure were modulated by normal respiration and muscle contraction. The arterial baroreflex, an inverse relationship between blood pressure and heart rate, was later reported. Nonetheless, it was then assumed that those responses involved vagal modulation. We summarize available evidence on the modulation of heart rate by acute or chronic aerobic exercise as well as its potential implications on BP control. Numerous studies have tried to clarify whether aerobic exercise modifies neurally-mediated vasoconstriction, but they report contradictory results...
July 10, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28687588/the-carotid-baroreflex-modifies-the-pressor-threshold-of-the-muscle-metaboreflex-in-humans
#5
Masashi Ichinose, Tomoko K Ichinose-Kuwahara, Kazuhito Watanabe, Narihiko Kondo, Takeshi Nishiyasu
The purpose of present study was to test our hypothesis that unloading the carotid baroreceptors alters the threshold and gain of the muscle metaboreflex in humans. Ten healthy subjects performed a static handgrip exercise at 50% of maximum voluntary contraction. Contraction was sustained for 15, 30, 45 and 60 s, and was followed by 3 min of forearm circulatory arrest, during which forearm muscular pH is known to decrease linearly with increasing contraction time. The carotid baroreceptors were unloaded by applying 0...
July 7, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28675547/baroreceptor-reflex-failure-review-of-the-literature-and-the-potential-impact-on-patients-with-head-and-neck-cancer
#6
Shivani Shah-Becker, Michael Pennock, Lawrence Sinoway, David Goldenberg, Neerav Goyal
BACKGROUND: Baroreceptor dysfunction and reflex failure may occur after surgery affecting the carotid artery. The implications for patients undergoing treatment for head and neck cancer are not well described. METHODS: A literature search of PubMed was performed between March 2016 and May 2016. Search terms used individually and in combination included: "baroreflex failure," "carotid sinus sensitivity," "carotid endarterectomy," "carotid body tumor," and "head and neck cancer...
July 4, 2017: Head & Neck
https://www.readbyqxmd.com/read/28663324/new-indices-from-microneurography-to-investigate-the-arterial-baroreflex
#7
Alexandre Laurin, Matthew G Lloyd, Tesshin Hachiya, Mitsuru Saito, Victoria E Claydon, Andrew Blaber
Baroreflex-mediated changes in heart rate and vascular resistance in response to variations in blood pressure are critical to maintain homeostasis. We aimed to develop time domain analysis methods to complement existing cross-spectral techniques in the investigation of the vascular resistance baroreflex response to orthostatic stress. A secondary goal was to apply these methods to distinguish between levels of orthostatic tolerance using baseline data. Eleven healthy, normotensive males participated in a graded lower body negative pressure protocol...
June 2017: Physiological Reports
https://www.readbyqxmd.com/read/28658076/recovery-time-profiling-after-short-middle-and-long-distance-swimming-performance
#8
Alessandro Piras, Matteo Cortesi, Francesco Campa, Monica Perazzolo, Giorgio Gatta
We investigated cardiac autonomic responses and hemodynamic parameters on recovery time following short-, middle- and long-swimming performance. Ten male regional-level swimmers were tested to estimate time and frequency domains of arterial baroreflex sensitivity and heart rate variability after 100-, 200-, and 400-m of front crawl. We found a BRS reduction for 90 min after a maximal 100- and 200-m front crawl event, meanwhile the reflex was restored back to the baseline value about 70 min after 400-m. The vagally mediated HF power of R-R intervals was significantly reduced for 30 min after 400-m, and more than 90 min after 100- and 200-m, with a concomitant increase of sympathetic modulation...
June 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28642732/autonomic-function-impairment-and-brain-perfusion-deficit-in-parkinson-s-disease
#9
Wei-Che Lin, Pei-Chin Chen, Chih-Cheng Huang, Nai-Wen Tsai, Hsiu-Ling Chen, Hung-Chen Wang, Kun-Hsien Chou, Meng-Hsiang Chen, Yi-Wen Chen, Cheng-Hsien Lu
INTRODUCTION: Autonomic disorders have been recognized as important Parkinson's disease (PD) components. Some vulnerable structures are related to the central autonomic network and have also been linked to autonomic function alterations. The aims of the study are to evaluate the severity of the autonomic dysfunction and the cortical hypoperfusion using arterial spin labeling (ASL) MRI. And then, possible relationships of significant between-group differences in perfusion pattern to clinical variables and autonomic functions were examined to determine the pharmaceutical effects of dopaminergic treatment on cerebral blood flow (CBF) in patients with PD...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28635325/effect-of-salt-loading-on-baroreflex-sensitivity-in-reduced-renal-mass-hypertension
#10
Besim Özaykan, Eylem Taskin, Ali Magemizoğlu
BACKGROUND: High dietary salt, as well as renal mass reduction, is known to decrease baroreflex sensitivity in rats. However, the effect of high salt intake on baroreflex sensitivity is unknown in reduced renal mass (RRM) hypertension; therefore, the aim of this study was to investigate the effects of salt loading on arterial baroreflex sensitivity and mean arterial pressure (MAP) in RRM hypertension. METHODS: Both RRM and sham-operated control (SO) rats were loaded with 0...
June 21, 2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28620841/device-based-approaches-for-the-treatment-of-arterial-hypertension
#11
REVIEW
Jens Jordan
Device-based antihypertensive treatments have primarily been developed and clinically tested for patients with hypertension refractory to pharmacological treatment. Most but not all device-based treatments target the sympathetic nervous system and provided important new insight in the mechanisms of human hypertension. This review provides an overview on the scientific rational and clinical data on recent device-based antihypertensive treatment approaches. Device-based treatments targeting the sympathetic nervous system include catheter-based renal nerve ablation, electrical carotid sinus stimulation, modulation of baroreflex transduction through a dedicated carotid stent, carotid body denervation, and deep brain stimulation...
July 2017: Current Hypertension Reports
https://www.readbyqxmd.com/read/28614420/the-degree-of-cardiac-baroreflex-involvement-during-active-standing-is-associated-with-the-quality-of-life-in-fibromyalgia-patients
#12
Antonio Roberto Zamunér, Alberto Porta, Carolina Pieroni Andrade, Meire Forti, Andrea Marchi, Raffaello Furlan, Franca Barbic, Aparecida Maria Catai, Ester Silva
Fibromyalgia syndrome (FMS) is a rheumatologic disorder characterized by chronic widespread pain, fatigue and other symptoms. Baroreflex dysfunction has been observed in women with FMS. However, it is unknown whether the limited involvement of the baroreflex control during an orthostatic stimulus has some impact on the quality of life of the FMS patient. Therefore, the aim of the study is evaluate the relationship between the quality of life of the FMS patient and indexes of the cardiovascular autonomic control as estimated from spontaneous fluctuations of heart period (HP) and systolic arterial pressure (SAP)...
2017: PloS One
https://www.readbyqxmd.com/read/28566194/non-invasive-vagus-nerve-stimulation-acutely-improves-spontaneous-cardiac-baroreflex-sensitivity-in-healthy-young-men-a-randomized-placebo-controlled-trial
#13
Diego Antonino, André L Teixeira, Paulo M Maia-Lopes, Mayara C Souza, Jeann L Sabino-Carvalho, Aaron R Murray, Jim Deuchars, Lauro C Vianna
BACKGROUND: Despite positive outcomes of transcutaneous vagus nerve stimulation (tVNS) via the auricular branch of the vagus nerve (ABVN), the mechanisms underlying these outcomes remain unclear. Additionally, previous studies have not been controlled the possible placebo effects of tVNS. OBJECTIVE: To test the hypothesis that tVNS acutely improves spontaneous cardiac baroreflex sensitivity (cBRS) and autonomic modulation, and that these effects are specific to stimulation of ABVN...
May 19, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28562833/the-effect-of-physical-resistance-training-on-baroreflex-sensitivity-of-hypertensive-rats
#14
Moisés Felipe Pereira Gomes, Mariana Eiras Borges, Vitor de Almeida Rossi, Elizabeth de Orleans C de Moura, Alessandra Medeiros
Background: Baroreceptors act as regulators of blood pressure (BP); however, its sensitivity is impaired in hypertensive patients. Among the recommendations for BP reduction, exercise training has become an important adjuvant therapy in this population. However, there are many doubts about the effects of resistance exercise training in this population. Objective: To evaluate the effect of resistance exercise training on BP and baroreceptor sensitivity in spontaneously hypertensive rats (SHR)...
2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28557555/effect-of-obstructive-sleep-apnea-on-the-response-to-hypertension-therapy
#15
Michael G Ziegler, Milos Milic, Xiaojiong Lu, Munir Gharaibeh, Hamzeh Elayan
Obstructive sleep apnea (OSA) often precedes cardiovascular disease, partly due to treatment resistant hypertension. The nocturnal apneas of OSA trigger increased sympathetic nervous discharge during both sleep and wakefulness. Apneas also trigger cardiac release of the endogenous diuretic atrial natriuretic peptide. We hypothesized that treatment of the excess sympathetic nervous activity of OSA with a β1 blocker would lower 24 h blood pressure (BP) more than diuretic therapy. Subjects with OSA associated hypertension received 2 weeks of placebo followed by the β1 blocker nebivolol or hydrochlorothiazide (HCTZ) for 6 weeks in a blinded crossover study...
2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28549782/central-trkb-blockade-attenuates-icv-angiotensin-ii-hypertension-and-sympathetic-nerve-activity-in-male-sprague-dawley-rats
#16
Bryan K Becker, Hanjun Wang, Irving H Zucker
Increased sympathetic nerve activity and the activation of the central renin-angiotensin system are commonly associated with cardiovascular disease states such as hypertension and heart failure, yet the precise mechanisms contributing to the long-term maintenance of this sympatho-excitation are incompletely understood. Due to the established physiological role of neurotrophins contributing toward neuroplasticity and neuronal excitability along with recent evidence linking the renin-angiotensin system and brain-derived neurotrophic factor (BDNF) along with its receptor (TrkB), it is likely the two systems interact to promote sympatho-excitation during cardiovascular disease...
July 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28548286/obesity-gets-on-your-renal-nerves
#17
EDITORIAL
B L Jensen
No abstract text is available yet for this article.
May 26, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28545853/elevated-sympathetic-activity-endothelial-dysfunction-and-late-hypertension-after-repair-of-coarctation-of-the-aorta
#18
Melissa G Y Lee, Robyn A Hemmes, Jonathan Mynard, Elisabeth Lambert, Geoffrey A Head, Michael M H Cheung, Igor E Konstantinov, Christian P Brizard, Gavin Lambert, Yves d'Udekem
BACKGROUND: There is a high prevalence of late hypertension after coarctation repair. The relative contribution of elevated sympathetic tone and endothelial dysfunction to its development is unknown. This study aims to investigate the neural profile of coarctation patients including muscle sympathetic nerve activity testing to directly measure sympathetic nervous activity. METHODS: Twenty-three patients aged ≥18years with a coarctation repair underwent measurements of clinic and 24-h blood pressures, muscle sympathetic nerve activity, sympathetic and cardiac baroreflex functions, digital endothelial function, and ambulatory arterial stiffness index...
May 19, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28529059/a-review-of-human-neuroimaging-investigations-involved-with-central-autonomic-regulation-of-baroreflex-mediated-cardiovascular-control
#19
REVIEW
Derek S Kimmerly
Effective regulation of central blood volume and arterial pressure is critical for optimal cardiovascular homeostasis. Inadequate regulation of mean arterial pressure has important pathophysiological implications including syncope, end organ damage, and stroke. Such regulation requires appropriate central integration of barosensory afferents and reflex autonomic control of the heart and blood vessels. The neural pathways involved with the baroreflex include brainstem nuclei that receive modulatory input from higher brain centres...
May 15, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28507235/assessing-the-strength-of-cardiac-and-sympathetic-baroreflex-controls-via-transfer-entropy-during-orthostatic-challenge
#20
Alberto Porta, Andrea Marchi, Vlasta Bari, Beatrice De Maria, Murray Esler, Elisabeth Lambert, Mathias Baumert
The study assesses the strength of the causal relation along baroreflex (BR) in humans during an incremental postural challenge soliciting the BR. Both cardiac BR (cBR) and sympathetic BR (sBR) were characterized via BR sequence approaches from spontaneous fluctuations of heart period (HP), systolic arterial pressure (SAP), diastolic arterial pressure (DAP) and muscle sympathetic nerve activity (MSNA). A model-based transfer entropy method was applied to quantify the strength of the coupling from SAP to HP and from DAP to MSNA...
June 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
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