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https://www.readbyqxmd.com/read/27895591/comparison-in-conscious-rabbits-of-the-baroreceptor-heart-rate-reflex-effects-of-chronic-treatment-with-rilmenidine-moxonidine-and-clonidine
#1
Monique L Parkin, Kyungjoon Lim, Sandra L Burke, Geoffrey A Head
We investigated the effects of chronic subcutaneous treatment with centrally-acting antihypertensive agents moxonidine, rilmenidine, and clonidine on the baroreflex control of heart rate (HR) in conscious normotensive rabbits over 3 weeks. Infusions of phenylephrine and nitroprusside were performed at week 0 and at weeks 1 and 3 of treatment to determine mean arterial pressure (MAP)-HR baroreflex relationships. A second curve was performed after intravenous methscopolamine to determine the sympathetic baroreflex relationship...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27895136/recognition-and-management-of-resistant-hypertension
#2
REVIEW
Branko Braam, Sandra J Taler, Mahboob Rahman, Jennifer A Fillaus, Barbara A Greco, John P Forman, Efrain Reisin, Debbie L Cohen, Mohammad G Saklayen, S Susan Hedayati
Despite improvements in hypertension awareness and treatment, 30%-60% of hypertensive patients do not achieve BP targets and subsequently remain at risk for target organ damage. This therapeutic gap is particularly important to nephrologists, who frequently encounter treatment-resistant hypertension in patients with CKD. Data are limited on how best to treat patients with CKD and resistant hypertension, because patients with CKD have historically been excluded from hypertension treatment trials. First, we propose a consistent definition of resistant hypertension as BP levels confirmed by both in-office and out-of-office measurements that exceed appropriate targets while the patient is receiving treatment with at least three antihypertensive medications, including a diuretic, at dosages optimized to provide maximum benefit in the absence of intolerable side effects...
November 28, 2016: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/27885177/-response-to-mechanical-stimulus-and-cardiovascular-homeostasis
#3
Ken Takahashi, Keiji Naruse
Response to mechanical stimulus, including blood pressure regulation as a typical example, is essential for cardiovascular homeostasis. Traditionally, mechanism of blood pressure regulation can be divided into two categories:short term neural regulation via arterial baroreceptor reflex and long term humoral regulation via renin-angiotensin system. Recent studies have revealed that sensitivity of baroreceptor reflex is impaired in metabolic syndrome and aging. Moreover, it is suggested that the baroreceptor reflex is involved in long term blood pressure regulation...
2016: Clinical Calcium
https://www.readbyqxmd.com/read/27881668/restoration-of-thermoregulation-after-exercise
#4
Glen P Kenny, Ryan McGinn
Performing exercise, especially in the hot conditions, can heat the body causing significant increases in internal body temperature. To offset this increase, powerful and highly developed autonomic thermoregulatory responses (i.e., skin blood flow and sweating) are activated to enhance whole-body heat loss; a response mediated by temperature sensitive receptors in both the skin and the internal core regions of the body. Independent of thermal control of heat loss, nonthermal factors can have profound consequences on the body's ability to dissipate heat during exercise...
November 23, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27861895/effects-of-postural-change-from-supine-to-head-up-tilt-on-skin-sympathetic-nerve-activity-component-synchronised-with-cardiac-cycle-in-warmed-men
#5
Yu Ogawa, Yoshi-Ichiro Kamijo, Shigeki Ikegawa, Shizue Masuki, Hiroshi Nose
In humans, the cutaneous vasodilatation response to hyperthermia has been suggested to be suppressed by baroreflexes to maintain arterial pressure when the posture was changed from supine to upright, and if the reflexes do not function sufficiently, it can cause heat syncope. However, the efferent signals of the reflexes have not been identified. To identify the signals, we continuously measured skin sympathetic nerve activity (SSNA; microneurography), right atrial volume (RAV; echocardiography, the baroreceptors for the reflexes are reportedly located), cutaneous vascular conductance on the chest (CVCchest ; laser Doppler flowmetry), and oesophageal temperature (Toes ; thermocouple) in young men before and after passive warming with a perfusion suit, during which periods the posture was changed from supine to 30° head-up tilt positions...
November 8, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27835975/empagliflozin-lessened-cardiac-injury-and-reduced-visceral-adipocyte-hypertrophy-in-prediabetic-rats-with-metabolic-syndrome
#6
Hiroaki Kusaka, Nobutaka Koibuchi, Yu Hasegawa, Hisao Ogawa, Shokei Kim-Mitsuyama
BACKGROUND: The potential benefit of SGLT2 inhibitors in metabolic syndrome is with prediabetic stage unclear. This work was undertaken to investigate the non-glycemic effect of empagliflozin on metabolic syndrome rats with prediabetes. METHODS: SHR/NDmcr-cp(+/+) rats (SHRcp), a model of metabolic syndrome with prediabetes, were given empagliflozin for 10 weeks to examine the effects on urinary sodium and water balance, visceral and subcutaneous adipocyte, and cardiac injury...
November 11, 2016: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/27824693/aerobic-exercise-training-improves-orthostatic-tolerance-in-aging-humans
#7
Diqun Xu, Hong Wang, Shande Chen, Sarah Ross, Howe Liu, Albert Olivencia-Yurvati, Peter B Raven, Xiangrong Shi
PURPOSE: This study was designed to test the hypothesis that aerobic exercise training of the elderly will increase aerobic fitness without compromising orthostatic tolerance (OT). METHODS: Eight healthy sedentary volunteers (67.0±1.7 years old, 4 women) participated in 1-year of endurance exercise training (stationary bicycle and/or treadmill) program at the individuals' 65%-75% of peak heart rate (HRpeak). Peak O2 uptake (VO2peak) and HRpeak were determined by a maximal exercise stress test using a bicycle ergometer...
November 7, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27802329/loss-of-breathing-modulation-of-heart-rate-variability-in-patients-with-recent-and-long-standing-diabetes-mellitus-type-ii
#8
Ana Leonor Rivera, Bruno Estañol, Ruben Fossion, Juan C Toledo-Roy, José A Callejas-Rojas, José A Gien-López, Guillermo R Delgado-García, Alejandro Frank
Healthy subjects under rhythmic breathing have heart interbeat intervals with a respiratory band in the frequency domain that can be an index of vagal activity. Diabetes Mellitus Type II (DM) affects the autonomic nervous system of patients, thus it can be expected changes on the vagal activity. Here, the influence of DM on the breathing modulation of the heart rate is evaluated by analyzing in the frequency domain heart interbeat interval (IBI) records obtained from 30 recently diagnosed, 15 long standing DM patients, and 30 control subjects during standardized clinical tests of controlled breathing at 0...
2016: PloS One
https://www.readbyqxmd.com/read/27773408/assessment-of-left-ventricular-ejection-force-and-sympathetic-skin-response-in-normotensive-and-hypertensive-subjects-a-double-blind-observational-comparative-case-control-study
#9
Tarun Saxena, Sanjay Patidar, Manjari Saxena
BACKGROUND: Pathophysiology of essential hypertension remains obscure. Correlation among ventricular ejection force, sympathetic activity, and hypertension is less clearly narrated in hypertensive subjects. AIMS AND OBJECTIVES: To assess correlation among ventricular ejection force, sympathetic activity, and hypertension in hypertensive subjects, and to be compared with normotensive subjects. METHODS: This is a case-control study to assess left ventricular ejection force (LVEF) and sympathetic skin response, in normotensive (group 1; control), and hypertensive subjects (group 2; cases)...
September 2016: Indian Heart Journal
https://www.readbyqxmd.com/read/27754003/js-ish-isn-2-role-of-the-kidney-in-resistant-hypertension-why-so-resistant-to-bp-control-in-ckd-patients
#10
George Bakris
Resistant hypertension is defined as a blood pressure above 140/90 mmHg despite adherence to a combination of at least three optimally dosed antihypertensive medications, one of which is a diuretic. Chronic kidney disease (CKD) is one of the more common patient comorbidities associated with resistant hypertension. Recommended low-salt diet and triple antihypertensive drug regimens that include a diuretic, should be complemented by the sequential addition of other antihypertensive drugs. CKD is associated with premature vascular ageing, characterized by accelerated arteriosclerosis or atherosclerosis and endothelial dysfunction...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27753885/ish-ada-06-intima-media-thickness-of-the-carotid-bulb-is-associated-with-worsening-of-orthostatic-hypotension-in-patients-with-metabolic-disorder
#11
Yusuke Kobayashi, Hideo Kobayashi, Hiroaki Ishiguro, Keisuke Yatsu, Tetsuya Fujikawa, Satoshi Umemura
OBJECTIVE: Though both carotid bulb and aortic arch are known to play important roles in regulation of blood pressure through modulation in baroreflex function, few studies have investigated the association of carotid bulb atherosclerosis and large arterial stiffness and orthostatic blood pressure change. DESIGN AND METHOD: Patients with metabolic disorder such as hypertension, dyslipidemia and diabetes mellitus underwent measurement of segment-specific carotid intima-media thickness (IMT) (as an index of atherosclerosis of carotid bulb), cardio-ankle vascular index (CAVI) (as an index for large arterial stiffness), heart rate variability (HRV) (as an index of baroreflex function) and sit-to-stand orthostatic blood pressure change (as a simple method for detecting orthostatic hypotension)...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27733385/hormone-phase-influences-sympathetic-responses-to-high-levels-of-lower-body-negative-pressure-in-young-healthy-women
#12
Charlotte W Usselman, Chantelle A Nielson, Torri A Luchyshyn, Tamara I Gimon, Nicole S Coverdale, Stan H M Van Uum, J Kevin Shoemaker
We tested the hypothesis that sympathetic responses to baroreceptor unloading may be affected by circulating sex hormones. During lower body negative pressure at -30, -60, and -80 mmHg, muscle sympathetic nerve activity (MSNA), heart rate, and blood pressure were recorded in women who were taking (n = 8) or not taking (n = 9) hormonal contraceptives. All women were tested twice, once during the low-hormone phase (i.e., the early follicular phase of the menstrual cycle and the placebo phase of hormonal contraceptive use), and again during the high-hormone phase (i...
November 1, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27726028/serum-atrial-natriuretic-peptide-anp-as-an-objective-indicator-for-the-diagnosis-of-neurogenic-shock-animal-experiment-and-human-case-report
#13
Min-Zhu Zhao, Yong-Guo Li, Peng Zhang, Jin-Cheng Xiong, Shi-Sheng Zhu, Xuan Xiao, Jian-Bo Li
In forensic medicine, the diagnosis of death due to neurogenic shock is considered to be an aporia, as lacking objective indicators and presenting atypical symptoms in autopsy. Medico-legal disputes and complaints occasionally result from this ambiguity. To explore potential objective indicators of neurogenic shock, we set up a model of neurogenic shock by applying an external mechanical force on the carotid sinus baroreceptor in rabbits. The serum atrial natriuretic peptide (ANP) level was measured by radioimmunoassay in the control group (n = 8), survival group (n = 15) and death group (n = 5) both before and after the insult...
October 10, 2016: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/27704337/modeling-the-differentiation-of-a-and-c-type-baroreceptor-firing-patterns
#14
Jacob Sturdy, Johnny T Ottesen, Mette S Olufsen
The baroreceptor neurons serve as the primary transducers of blood pressure for the autonomic nervous system and are thus critical in enabling the body to respond effectively to changes in blood pressure. These neurons can be separated into two types (A and C) based on the myelination of their axons and their distinct firing patterns elicited in response to specific pressure stimuli. This study has developed a comprehensive model of the afferent baroreceptor discharge built on physiological knowledge of arterial wall mechanics, firing rate responses to controlled pressure stimuli, and ion channel dynamics within the baroreceptor neurons...
October 5, 2016: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/27643208/ish-ada-06-intima-media-thickness-of-the-carotid-bulb-is-associated-with-worsening-of-orthostatic-hypotension-in-patients-with-metabolic-disorder
#15
Yusuke Kobayashi, Hideo Kobayashi, Hiroaki Ishiguro, Keisuke Yatsu, Tetsuya Fujikawa, Satoshi Umemura
OBJECTIVE: Though both carotid bulb and aortic arch are known to play important roles in regulation of blood pressure through modulation in baroreflex function, few studies have investigated the association of carotid bulb atherosclerosis and large arterial stiffness and orthostatic blood pressure change. DESIGN AND METHOD: Patients with metabolic disorder such as hypertension, dyslipidemia and diabetes mellitus underwent measurement of segment-specific carotid intima-media thickness (IMT) (as an index of atherosclerosis of carotid bulb), cardio-ankle vascular index (CAVI) (as an index for large arterial stiffness), heart rate variability (HRV) (as an index of baroreflex function) and sit-to-stand orthostatic blood pressure change (as a simple method for detecting orthostatic hypotension)...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27642914/js-ish-isn-2-role-of-the-kidney-in-resistant-hypertension-why-so-resistant-to-bp-control-in-ckd-patients
#16
George Bakris
Resistant hypertension is defined as a blood pressure above 140/90 mmHg despite adherence to a combination of at least three optimally dosed antihypertensive medications, one of which is a diuretic. Chronic kidney disease (CKD) is one of the more common patient comorbidities associated with resistant hypertension. Recommended low-salt diet and triple antihypertensive drug regimens that include a diuretic, should be complemented by the sequential addition of other antihypertensive drugs. CKD is associated with premature vascular ageing, characterized by accelerated arteriosclerosis or atherosclerosis and endothelial dysfunction...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27637162/endogenous-angiotensin-ii-in-the-paraventricular-nucleus-regulates-arterial-pressure-during-hypotension-in-rat-a-single-unit-study
#17
Mehrangiz Khanmoradi, Ali Nasimi
The hypothalamic paraventricular nucleus (PVN) plays a role in cardiovascular regulation through vasopressin release and sympathetic system. The PVN contains angiotensin II (AngII) immunoreactive cells, fibers and AngII receptors. We have already shown that microinjection of AngII into PVN produced a pressor response concomitant with an increase in firing rate of some PVN neurons. This study was performed to find if PVN AngII plays a regulatory function during hypotension. Hypovolemic-hypotension was induced and the possible role of the PVN AngII in returning arterial pressure toward normal was assessed by monitoring cardiovascular response and single-unit activity of the PVN neurons...
September 13, 2016: Neuroscience Research
https://www.readbyqxmd.com/read/27630578/aortic-baroreceptors-display-higher-mechanosensitivity-than-carotid-baroreceptors
#18
Eva On-Chai Lau, Chun-Yin Lo, Yifei Yao, Arthur Fuk-Tat Mak, Liwen Jiang, Yu Huang, Xiaoqiang Yao
Arterial baroreceptors are mechanical sensors that detect blood pressure changes. It has long been suggested that the two arterial baroreceptors, aortic and carotid baroreceptors, have different pressure sensitivities. However, there is no consensus as to which of the arterial baroreceptors are more sensitive to changes in blood pressure. In the present study, we employed independent methods to compare the pressure sensitivity of the two arterial baroreceptors. Firstly, pressure-activated action potential firing was measured by whole-cell current clamp with a high-speed pressure clamp system in primary cultured baroreceptor neurons...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27629265/increased-dietary-salt-changes-baroreceptor-sensitivity-and-intrarenal-renin-angiotensin-system-in-goldblatt-hypertension
#19
Caroline Gusson Shimoura, Gisele Silvério Lincevicius, Erika Emy Nishi, Adriana Castello Costa Girardi, Karin Argenti Simon, Cassia de Toledo Bergamaschi, Ruy Ribeiro Campos
BACKGROUND: Renovascular hypertension (2-kidney 1-clip model (2K1C)) is characterized by renin-angiotensin system (RAS) activation. Increased Angiotensin II (AngII) leads to sympathoexcitation, oxidative stress, and alterations in sodium and water balance. AIM: The aim of this study was to evaluate whether a discrete increase in sodium chloride intake in 2K1C rats leads to changes in cardiovascular and autonomic function, oxidative stress, and renin angiotensin aldosterone system...
September 14, 2016: American Journal of Hypertension
https://www.readbyqxmd.com/read/27623075/neuropeptide-y-mediated-sex-and-afferent-specific-neurotransmissions-contribute-to-sexual-dimorphism-of-baroreflex-afferent-function
#20
Yang Liu, Di Wu, Mei-Yu Qu, Jian-Li He, Mei Yuan, Miao Zhao, Jian-Xin Wang, Jian He, Lu-Qi Wang, Xin-Jing Guo, Meng Zuo, Shu-Yang Zhao, Mei-Na Ma, Jun-Nan Li, Weinian Shou, Guo-Fen Qiao, Bai-Yan Li
BACKGROUND: Molecular and cellular mechanisms of neuropeptide-Y (NPY)-mediated gender-difference in blood pressure (BP) regulation are largely unknown. METHODS: Baroreceptor sensitivity (BRS) was evaluated by measuring the response of BP to phenylephrine/nitroprusside. Serum NPY concentration was determined using ELISA. The mRNA and protein expression of NPY receptors were assessed in tissue and single-cell by RT-PCR, immunoblot, and immunohistochemistry. NPY was injected into the nodose while arterial pressure was monitored...
September 7, 2016: Oncotarget
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