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Cardiac parasympathetic function

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https://www.readbyqxmd.com/read/29329111/severe-peri-ictal-respiratory-dysfunction-is-common-in-dravet-syndrome
#1
YuJaung Kim, Eduardo Bravo, Caitlin K Thirnbeck, Lori A Smith-Mellecker, Se Hee Kim, Brian K Gehlbach, Linda C Laux, Douglas R Nordli Jr, George B Richerson
Dravet syndrome (DS) is a severe childhood-onset epilepsy commonly due to mutations of the sodium channel gene SCN1A. DS patients have a high risk of sudden unexplained death in epilepsy (SUDEP), believed to be due to cardiac mechanisms. Here we show that DS patients have peri-ictal respiratory dysfunction. One patient who had severe and prolonged postictal hypoventilation later died of SUDEP. Mice with an Scn1aR1407X/+ loss of function mutation died after spontaneous and heat-induced seizures due to central apnea followed by progressive bradycardia...
January 11, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29315657/dysautonomy-in-different-death-risk-groups-rassi-score-in-patients-with-chagas-heart-disease
#2
Catherine Masiel Merejo Peña, Michel Silva Reis, Basílio de Bragança Pereira, Emília Matos do Nascimento, Roberto Coury Pedrosa
BACKGROUND: It has been difficult to prove that the "catecholamine-induced cardiomyopathy" contributes to the mechanism of sudden cardiac death in Chagas heart disease. Also, it is almost impossible to rule out the possibility that is not involved in the process. More importantly, the vagal-cholinergic pathway in the ventricle plays a direct role in the prevention of the initiation of complex ventricular arrhythmias, including non-sustained ventricular tachycardia, ventricular fibrillation responsible for sudden death...
January 5, 2018: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29306794/the-short-term-effects-of-indoor-size-fractioned-particulate-matter-and-black-carbon-on-cardiac-autonomic-function-in-copd-patients
#3
Lu Pan, Shaowei Wu, Hongyu Li, Junhui Xu, Wei Dong, Jiao Shan, Xuan Yang, Yahong Chen, Masayuki Shima, Furong Deng, Xinbiao Guo
BACKGROUND: Previous studies have reported adverse health effects of indoor air pollutants especially particulate matter (PM) and black carbon (BC). Patients with chronic obstructive pulmonary disease (COPD) have been shown to be more likely with cardiovascular comorbidities in which cardiac autonomic dysfunction plays an important role. However, there is little evidence for the effect of indoor PM and BC exposures on cardiac autonomic function in COPD patients. OBJECTIVES: To evaluate the association between exposure to indoor size-fractioned PM and BC and changes in HRV and HR in COPD patients...
January 3, 2018: Environment International
https://www.readbyqxmd.com/read/29283224/autonomic-regulation-therapy-to-enhance-myocardial-function-in-heart-failure-patients-the-anthem-hfpef-study
#4
Lorenzo A DiCarlo, Imad Libbus, H Uday Kumar, Sanjay Mittal, Rajendra K Premchand, Badri Amurthur, Bruce H KenKnight, Jeffrey L Ardell, Inder S Anand
BACKGROUND: Approximately half of the patients presenting with new-onset heart failure (HF) have HF with preserved left ventricular ejection fraction (HFpEF) and HF with mid-range left ventricular ejection fraction (HFmrEF). These patients have neurohormonal activation like that of HF with reduced ejection fraction; however, beta-blockers and angiotensin-converting enzyme inhibitors have not been shown to improve their outcomes, and current treatment for these patients is symptom based and empiric...
December 28, 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/29278717/heart-rate-variability-associated-with-grey-matter-volumes-in-striatal-and-limbic-structures-of-the-central-autonomic-network
#5
Luqing Wei, Hong Chen, Guo-Rong Wu
Previous neuroimaging studies have highlighted the functional neural correlates of cardiac vagal activity, providing convergent evidence that the cardiac vagal function is controlled by a number of brain regions in the central autonomic network (CAN). However, it remains largely unknown whether the underlying anatomicalbasis of those identified regions are associated with individual difference in vagal function. To address the above issue, this study used a large sample of healthy subjects (n=185) and voxel-based morphometry (VBM) analysis to verify brain morphometry associated with vagal control and the associations varied as a function of gender and age...
December 23, 2017: Brain Research
https://www.readbyqxmd.com/read/29246267/autonomic-nervous-system-functioning-related-to-nocturnal-sleep-in-patients-with-chronic-fatigue-syndrome-compared-to-tired-controls
#6
Maija Orjatsalo, Anniina Alakuijala, Markku Partinen
STUDY OBJECTIVES: Autonomic nervous system (ANS) dysfunction is common in chronic fatigue syndrome (CFS). One of the main complaints in CFS is unrefreshing sleep. We aimed to study the nocturnal cardiac ANS in different sleep stages in patients filling the 2015 Institute of Medicine CFS diagnostic criteria. METHODS: In this case series study, the nocturnal heart rate variability and blood pressure (BP) variables in polysomnography were studied in groups of patients with CFS (n = 8) and tired controls (n = 8) aged 16-49 years...
December 13, 2017: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
https://www.readbyqxmd.com/read/29242010/heart-rate-variability-analysis-in-patients-who-have-bradycardia-presenting-to-the-emergency-department-with-chest-pain
#7
Jeffrey Tadashi Sakamoto, Nan Liu, Zhi Xiong Koh, Dagang Guo, Micah Liam Arthur Heldeweg, Janson Cheng Ji Ng, Marcus Eng Hock Ong
BACKGROUND: Heart rate variability (HRV) is a noninvasive method to measure the function of the autonomic nervous system. It has been used to risk stratify patients with undifferentiated chest pain in the emergency department (ED). However, bradycardia can have a modifying effect on HRV. OBJECTIVE: In this study, we aimed to determine how bradycardia affected HRV analysis in patients who presented with chest pain to the ED. METHODS: Adult patients presenting to the ED at Singapore General Hospital with chest pain were included in the study...
December 11, 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29223653/effects-of-cardiac-rehabilitation-on-heart-rate-recovery-of-patients-undergoing-a-cardiac-rehabilitation-programme-after-acute-coronary-syndrome
#8
Tiffany Astolfi, Fabio Borrani, Milos Savcic, Vincent Gremeaux, Grégoire P Millet
BACKGROUND: An efficient cardiac rehabilitation programme (CRP) can improve the functional ability of patients after acute coronary syndrome (ACS). OBJECTIVE: To examine the effect of a CRP on parasympathetic reactivation and heart rate recovery (HRR) measured after a 6-min walk test (6MWT), and correlation with 6MWT distance and well-being after ACS. METHODS: Eleven normoweight patients after ACS (BMI < 25kg/m2; 10 males; mean [SD] age 61 [9] years) underwent an 8-week CRP...
December 6, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/29185078/evaluation-of-autonomic-functions-of-patients-with-multiple-system-atrophy-and-parkinson-s-disease-by-head-up-tilt-test
#9
Chikako Watano, Yuri Shiota, Keiichi Onoda, Abdullah Md Sheikh, Seiji Mishima, Eri Nitta, Shozo Yano, Shuhei Yamaguchi, Atsushi Nagai
The aim of this study was to evaluate the autonomic neural function in Parkinson's disease (PD) and multiple system atrophy (MSA) with head-up tilt test and spectral analysis of cardiovascular parameters. This study included 15 patients with MSA, 15 patients with PD, and 29 healthy control (HC) subjects. High frequency power of the RR interval (RR-HF), the ratio of low frequency power of RR interval to RR-HF (RR-LF/HF) and LF power of systolic BP were used to evaluate parasympathetic, cardiac sympathetic and vasomotor sympathetic functions, respectively...
November 28, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/29184345/vagus-nerve-stimulation-modulates-complexity-of-heart-rate-variability-differently-during-sleep-and-wakefulness
#10
Karthi Balasubramanian, K Harikumar, Nithin Nagaraj, Sandipan Pati
Progressive loss of heart rate variability (HRV) and complexity are associated with increased risk of mortality in patients with cardiovascular disease and are a candidate marker for patients at risk of sudden cardiac death. HRV is influenced by the cardiac autonomic nervous system (ANS), although it is unclear which arm of the ANS (sympathetic or parasympathetic) needs to be perturbed to increase the complexity of HRV. In this case-control study, we have analyzed the relation between modulation of vagus nerve stimulation (VNS) and changes in complexity of HRV as a function of states of vigilance...
October 2017: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/29143123/recovery-of-the-cardiac-autonomic-nervous-and-vascular-system-after-maximal-cardiopulmonary-exercise-testing-in-recreational-athletes
#11
Heidi Weberruss, Johannes Maucher, Renate Oberhoffer, Jan Müller
OBJECTIVE: The body's adaptation to physical exercise is modulated by sympathetic and parasympathetic (vagal) branches of the autonomic nervous system (ANS). Heart rate variability (HRV), the beat-to-beat variation of the heart, is a proxy measure for ANS activity, whereas blood pressure (BP) is an indicator for cardiovascular function. Impaired vagal activity and lower BP is already described after exercise. However, inconsistent results exist about how long vagal recovery takes and how long post-exercise hypotension persists...
January 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29137013/combination-of-ewing-test-heart-rate-variability-and-heart-rate-turbulence-analysis-for-early-diagnosis-of-diabetic-cardiac-autonomic-neuropathy
#12
Kun Lin, Liling Wei, Zhihua Huang, Qiong Zeng
The aim of this study was to compare and analyze Ewing test, heart rate variability (HRV), and heart rate turbulence (HRT) in the diagnosis of cardiac autonomic neuropathy (CAN) in diabetic patients.Ninety diabetic patients (age 18-78) and 20 nondiabetic control subjects were studied. Standard Ewing test and 24-hour Holter was performed in all participants to evaluate CAN. Patients with Ewing score ≥2 were classified as CAN+.The rate of CAN+ in diabetic patients [44.4% (40/90)] was higher than that in the controls [5% (1/20)] (P < ...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29122559/constant-hepatic-atp-concentrations-during-prolonged-fasting-and-absence-of-effects-of-cerbomed-nemos-%C3%A2-on-parasympathetic-tone-and-hepatic-energy-metabolism
#13
Sofiya Gancheva, Alessandra Bierwagen, Daniel F Markgraf, Gidon J Bönhof, Kevin G Murphy, Erifili Hatziagelaki, Jesper Lundbom, Dan Ziegler, Michael Roden
OBJECTIVE: Brain insulin-induced improvement in glucose homeostasis has been proposed to be mediated by the parasympathetic nervous system. Non-invasive transcutaneous auricular vagus nerve stimulation (taVNS) activating afferent branches of the vagus nerve may prevent hyperglycemia in diabetes models. We examined the effects of 14-min taVNS vs sham stimulation by Cerbomed Nemos(®) on glucose metabolism, lipids, and hepatic energy homeostasis in fasted healthy humans (n = 10, age 51 ± 6 yrs, BMI 25...
October 25, 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/29108934/cardiovascular-control-is-associated-with-pair-bond-success-in-male-prairie-voles
#14
Robert Lewis, Brek Wilkins, Bruce Benjamin, J Thomas Curtis
Social support structures reduce mortality and morbidity in humans, but the mechanisms underlying these reductions are not fully understood. The prevailing hypothesis is that social support buffers stress and reduces allostatic load, thereby increasing longevity. However, the possibility that affiliative social interactions confer health benefits independent of stress buffering is understudied. We examined autonomic function in prairie voles - arguably the premier species for modeling human social affiliation - to assess the possibility that the formation of strong social bonds alters autonomic function and contributes to health benefits...
October 2, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/29102669/acute-particulate-matter-affects-cardiovascular-autonomic-modulation-and-ifn-%C3%AE-methylation-in-healthy-volunteers
#15
Eleonora Tobaldini, Valentina Bollati, Marta Prado, Elisa M Fiorelli, Marica Pecis, Giorgio Bissolotti, Benedetta Albetti, Laura Cantone, Chiara Favero, Chiara Cogliati, Paolo Carrer, Andrea Baccarelli, Pier Alberto Bertazzi, Nicola Montano
AIMS: Air particulate matter (PM) is associated with increased cardiovascular morbidity and mortality. Altered autonomic functions play a key role in PM-induced cardiovascular disease. However, previous studies have not address the impact of PM on sympathetic and parasympathetic control of heart function, independently, and using controlled conditions, i.e., increasing titration of PM of known composition, in absence of other potential confounding factors. To fill this gap, here we used symbolic analysis that is capable of detecting non-mutual changes of the two autonomic branches, thus considering them as independent, and concentrations of PM as they could be measured at peak levels in Milan during a polluted winter day...
November 2, 2017: Environmental Research
https://www.readbyqxmd.com/read/29080228/morphology-of-subcortical-brain-nuclei-is-associated-with-autonomic-function-in-healthy-humans
#16
James K Ruffle, Steven J Coen, Vincent Giampietro, Steven C R Williams, A Vania Apkarian, Adam D Farmer, Qasim Aziz
The autonomic nervous system (ANS) is a brain body interface which serves to maintain homeostasis by influencing a plethora of physiological processes, including metabolism, cardiorespiratory regulation and nociception. Accumulating evidence suggests that ANS function is disturbed in numerous prevalent clinical disorders, including irritable bowel syndrome and fibromyalgia. While the brain is a central hub for regulating autonomic function, the association between resting autonomic activity and subcortical morphology has not been comprehensively studied and thus was our aim...
October 28, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29075174/modulation-of-cardiac-autonomic-function-by-fingolimod-initiation-and-predictors-for-fingolimod-induced-bradycardia-in-patients-with-multiple-sclerosis
#17
Kai Li, Urszula Konofalska, Katja Akgün, Manja Reimann, Heinz Rüdiger, Rocco Haase, Tjalf Ziemssen
Objective: It is well-known that initiation of fingolimod induces a transient decrease of heart rate. However, the underlying cardiac autonomic regulation is poorly understood. We aimed to investigate the changes of autonomic activity caused by the first dose of fingolimod using a long-term multiple trigonometric spectral analysis for the first time. In addition, we sought to use the continuous Holter ECG recording to find predictors for fingolimod induced bradycardia. Methods: Seventy-eight patients with relapsing-remitting multiple sclerosis (RRMS) were included...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29060607/resting-state-brain-correlates-of-cardiovascular-complexity
#18
G Valenza, A Duggento, L Passamonti, S Diciotti, C Tessa, N Toschi, R Barbieri
While estimates of complex heartbeat dynamics have provided effective prognostic and diagnostic markers for a wide range of pathologies, brain correlates of complex cardiac measures in general and of complex sympatho-vagal dynamics in particular are still unknown. In this study we combine resting state functional Magnetic Resonance Imaging (fMRI) and physiological signal acquisition from 34 healthy subjects selected from the Human Connectome Project (HCP) repository with inhomogeneous point-process approximate and sample heartbeat entropy measures (ipApEn and ipSampEn) to investigate brain areas involved in complex cardiovascular control...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28983659/cardiac-and-peripheral-vasomotor-autonomic-functions-in-late-onset-transthyretin-val30met-familial-amyloid-polyneuropathy
#19
Haruki Koike, Tomohiko Nakamura, Atsushi Hashizume, Ryoji Nishi, Shohei Ikeda, Yuichi Kawagashira, Masahiro Iijima, Masahisa Katsuno, Gen Sobue
The objective of this study was to systematically investigate cardiac and peripheral vasomotor autonomic functions in late-onset transthyretin Val30Met familial amyloid polyneuropathy (FAP ATTR Val30Met) patients from non-endemic areas. The coefficient of variation of R-R intervals (CVR-R), responses to the Valsalva manoeuvre, head-up tilt test with impedance cardiography, noradrenaline infusion test, and (123)I-metaiodobenzylguanidine (MIBG) myocardial scintigraphy were assessed in eight patients. Although only four patients manifested orthostatic hypotension during the head-up tilt test, CVR-R, responses to the Valsalva manoeuvre, and myocardial MIBG uptake indicated a higher prevalence of cardiac sympathetic and parasympathetic dysfunction...
November 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28978872/the-impact-of-menstrual-cycle-phases-on-cardiac-autonomic-nervous-system-activity-an-observational-study-considering-lifestyle-diet-physical-activity-and-sleep-among-female-college-students
#20
Yuki Tada, Takahiro Yoshizaki, Yasutake Tomata, Yuri Yokoyama, Ayaka Sunami, Azumi Hida, Yukari Kawano
Studies examining the impact of menstrual cycle phases on the cardiac autonomic nervous system have produced inconsistent results. This study aimed to investigate this relationship, controlling for the confounding effects of diet, physical activity, and sleep, which can be affected by the menstrual cycle. Fifteen female college students with regular menses were enrolled. Data regarding 24-h heart rate variability (HRV), dietary intake, eating behavior, menstrual distress, and sleep and activity parameters were obtained during the follicular and luteal phases...
2017: Journal of Nutritional Science and Vitaminology
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