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Cardiovascular physiology

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https://www.readbyqxmd.com/read/29047097/from-physiological-redox-signalling-to-oxidant-stress
#1
Jeremy P T Ward
Oxidant stress is strongly associated with cardiovascular disease, including pulmonary hypertension, but antioxidant therapies have so far proven ineffective. This is partly due to a lack of understanding of the key role played by reactive oxygen species (ROS) in physiological cell signalling, and partly to the complex interrelationships between generators of ROS (e.g. mitochondria and NADPH oxidases, NOX), cellular antioxidant systems and indeed Ca(2+) signalling. At physiological levels ROS reversibly affect the function of numerous enzymes and transcription factors, most often via oxidation of specific protein thiols...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29047077/adventitial-fibroblast-nox4-expression-and-ros-signaling-in-pulmonary-arterial-hypertension
#2
Scott A Barman, David Fulton
Pulmonary arterial hypertension (PAH) is a progressive disease arising from remodeling and narrowing of pulmonary arteries (PA) resulting in high pulmonary arterial blood pressure and ultimately right ventricular failure. Elevated production of reactive oxygen species (ROS) by NADPH oxidase 4 (Nox4), a constitutively active enzyme, has been associated with oxygen sensing, vasomotor control, cellular proliferation, differentiation, migration, apoptosis, senescence, fibrosis, and angiogenesis. Further, elevated expression of Nox4 has been reported in a number of cardiovascular diseases, including atherosclerosis, hypertension, cardiac failure, ischemic stroke, and PAH...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29045335/angiotensin-converting-enzyme-2-and-renal-disease
#3
Vanessa R Williams, James W Scholey
PURPOSE OF REVIEW: The renin-angiotensin system (RAS) is a pivotal player in the physiology and pathophysiology of cardiovascular and renal systems. Discovery of angiotensin-converting enzyme 2 (ACE2), capable of cleaving RAS effector peptide angiotensin (Ang) II into biologically active Ang-(1-7), has increased the complexity of our knowledge of the RAS. ACE2 expression is abundant in the kidney and is thought to provide protection against injury. This review emphasizes current experimental and clinical findings that examine ACE2 in the context of kidney injury and its potential therapeutic impact for treatment of kidney disease...
October 16, 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/29043476/drug-induced-sedation-endoscopy-dise-data-fusion-system-clinical-feasibility-study
#4
Esuabom Dijemeni, Bhik Kotecha
Drug-induced sleep endoscopy (DISE) is a diagnostic technique for 3D dynamic anatomical visualisation of upper airway obstruction during sedated sleep. There is a lack of standardised procedure and objective measurement associated with information capture, information management, evaluation of DISE findings, treatment planning, and treatment outcomes. The objective of this study is to present clinical feasibility results using a DISE DATA FUSION system for capturing, merging, displaying and storing anatomical data from an endoscopic imaging system and cardiorespiratory data from an anaesthesiological monitoring system simultaneously in real-time during DISE...
October 17, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29043113/simultaneous-tracking-of-cardiorespiratory-signals-for-multiple-persons-using-a-machine-vision-system-with-noise-artifact-removal
#5
Ali Al-Naji, Javaan Chahl
Most existing non-contact monitoring systems are limited to detecting physiological signs from a single subject at a time. Still, another challenge facing these systems is that they are prone to noise artifacts resulting from motion of subjects, facial expressions, talking, skin tone, and illumination variations. This paper proposes an efficient non-contact system based on a digital camera to track the cardiorespiratory signal from a number of subjects (up to six persons) at the same time with a new method for noise artifact removal...
2017: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/29042392/renal-and-cardiovascular-effects-of-sodium-glucose-cotransporter-2-sglt2-inhibition-in-combination-with-loop-diuretics-in-diabetic-patients-with-chronic-heart-failure-recede-chf-protocol-for-a-randomised-controlled-double-blind-cross-over-trial
#6
Natalie A Mordi, Ify R Mordi, Jagdeep S Singh, Fatima Baig, Anna-Maria Choy, Rory J McCrimmon, Allan D Struthers, Chim C Lang
INTRODUCTION: Type 2 diabetes (T2D) and heart failure (HF) are a frequent combination, where treatment options remain limited. There has been increasing interest around the sodium-glucose cotransporter 2 (SGLT2) inhibitors and their use in patients with HF. Data on the effect of SGLT2 inhibitor use with diuretics are limited. We hypothesise that SGLT2 inhibition may augment the effects of loop diuretics and the benefits of SGLT2 inhibitors may extend beyond those of their metabolic (glycaemic parameters and weight loss) and haemodynamic parameters...
October 16, 2017: BMJ Open
https://www.readbyqxmd.com/read/29042072/mir-200b-downregulates-kruppel-like-factor-2-klf2-during-acute-hypoxia-in-human-endothelial-cells
#7
Rafal Bartoszewski, Marcin Serocki, Anna Janaszak-Jasiecka, Sylwia Bartoszewska, Kinga Kochan-Jamrozy, Arkadiusz Piotrowski, Jarosław Króliczewski, James F Collawn
The role of microRNAs in controlling angiogenesis is recognized as a promising therapeutic target in both cancer and cardiovascular disorders. However, understanding a miRNA's pleiotropic effects on angiogenesis is a limiting factor for these types of therapeutic approaches. Using genome-wide next-generation sequencing, we examined the role of an antiangiogenic miRNA, miR-200b, in primary human endothelial cells. The results indicate that miR-200b has complex effects on hypoxia-induced angiogenesis in human endothelia and importantly, that many of the reported miR-200b effects using miRNA overexpression may not be representative of the physiological role of this miRNA...
October 13, 2017: European Journal of Cell Biology
https://www.readbyqxmd.com/read/29040623/socio-economic-trajectories-and-cardiovascular-disease-mortality-in-older-people-the-english-longitudinal-study-of-ageing
#8
Silvia Stringhini, Paola Zaninotto, Meena Kumari, Mika Kivimäki, Camille Lassale, G David Batty
Background: Socio-economic status from early life has been linked to cardiovascular disease risk, but the impact of life-course socio-economic trajectories, as well as the mechanisms underlying social inequalities in cardiovascular disease risk, is uncertain. Objectives: We assessed the role of behavioural, psychosocial and physiological (including inflammatory) factors in the association between life-course socio-economic status and cardiovascular disease mortality in older adults...
July 28, 2017: International Journal of Epidemiology
https://www.readbyqxmd.com/read/29040268/benefit-and-harm-of-intensive-blood-pressure-treatment-derivation-and-validation-of-risk-models-using-data-from-the-sprint-and-accord-trials
#9
Sanjay Basu, Jeremy B Sussman, Joseph Rigdon, Lauren Steimle, Brian T Denton, Rodney A Hayward
BACKGROUND: Intensive blood pressure (BP) treatment can avert cardiovascular disease (CVD) events but can cause some serious adverse events. We sought to develop and validate risk models for predicting absolute risk difference (increased risk or decreased risk) for CVD events and serious adverse events from intensive BP therapy. A secondary aim was to test if the statistical method of elastic net regularization would improve the estimation of risk models for predicting absolute risk difference, as compared to a traditional backwards variable selection approach...
October 2017: PLoS Medicine
https://www.readbyqxmd.com/read/29038209/activation-and-inhibition-of-sodium-hydrogen-exchanger-is-a-mechanism-that-links-the-pathophysiology-and-treatment-of-diabetes-mellitus-with-that-of-heart-failure
#10
REVIEW
Milton Packer
The mechanisms underlying the progression of diabetes mellitus and heart failure are closely intertwined, such that worsening of one condition is frequently accompanied by worsening of the other; the degree of clinical acceleration is marked when the 2 coexist. Activation of the sodium-hydrogen exchanger in the heart and vasculature (NHE1 isoform) and the kidneys (NHE3 isoform) may serve as a common mechanism that links both disorders and may underlie their interplay. Insulin insensitivity and adipokine abnormalities (the hallmarks of type 2 diabetes mellitus) are characteristic features of heart failure; conversely, neurohormonal systems activated in heart failure (norepinephrine, angiotensin II, aldosterone, and neprilysin) impair insulin sensitivity and contribute to microvascular disease in diabetes mellitus...
October 17, 2017: Circulation
https://www.readbyqxmd.com/read/29037833/insights-into-the-background-of-autonomic-medicine
#11
Sérgio Laranjo, Vera Geraldes, Mário Oliveira, Isabel Rocha
Knowledge of the physiology underlying the autonomic nervous system is pivotal for understanding autonomic dysfunction in clinical practice. Autonomic dysfunction may result from primary modifications of the autonomic nervous system or be secondary to a wide range of diseases that cause severe morbidity and mortality. Together with a detailed history and physical examination, laboratory assessment of autonomic function is essential for the analysis of various clinical conditions and the establishment of effective, personalized and precise therapeutic schemes...
October 13, 2017: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/29036837/simvastatin-as-a-potential-disease-modifying-therapy-for-patients-with-parkinson-s-disease-rationale-for%C3%A2-clinical-trial-and-current-progress
#12
Camille B Carroll, Richard K H Wyse
Many now believe the holy grail for the next stage of therapeutic advance surrounds the development of disease-modifying approaches aimed at intercepting the year-on-year neurodegenerative decline experienced by most patients with Parkinson's disease (PD). Based on recommendations of an international committee of experts who are currently bringing multiple, potentially disease-modifying, PD therapeutics into long-term neuroprotective PD trials, a clinical trial involving 198 patients is underway to determine whether Simvastatin provides protection against chronic neurodegeneration...
October 13, 2017: Journal of Parkinson's Disease
https://www.readbyqxmd.com/read/29035323/hypothalamic-pituitary-adrenal-axis-modulation-of-glucocorticoids-in-the-cardiovascular-system
#13
REVIEW
Natalie G Burford, Natalia A Webster, Diana Cruz-Topete
The collective of endocrine organs acting in homeostatic regulation-known as the hypothalamic-pituitary-adrenal (HPA) axis-comprises an integration of the central nervous system as well as peripheral tissues. These organs respond to imminent or perceived threats that elicit a stress response, primarily culminating in the release of glucocorticoids into the systemic circulation by the adrenal glands. Although the secretion of glucocorticoids serves to protect and maintain homeostasis in the typical operation at baseline levels, inadequate regulation can lead to physiologic and psychologic pathologies...
October 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29034255/perioperative-management-of-elderly-patients-with-gastrointestinal-malignancies-the-contribution-of-anesthesia
#14
REVIEW
Rudolf Mörgeli, Kathrin Scholtz, Johannes Kurth, Sascha Treskatsch, Bruno Neuner, Susanne Koch, Lutz Kaufner, Claudia Spies
INTRODUCTION: Elderly patients suffering from gastrointestinal malignancies are particularly prone to perioperative complications. Elderly patients often present with reduced physiological reserves, and comorbidities can limit treatment options and promote complications. Surgeons and anesthesiologists must be aware of strategies required to deal with this vulnerable subgroup. METHODS: We provide a brief review of current and emerging perioperative strategies for the treatment of elderly patients with gastrointestinal malignancies and frequent comorbidities...
August 2017: Visceral Medicine
https://www.readbyqxmd.com/read/29032954/coronary-flow-reserve-is-predictive-of-the-risk-of-cardiovascular-death-regardless-of-chronic-kidney-disease-stage
#15
David M Charytan, Hicham Skali, Nishant R Shah, Vikas Veeranna, Michael K Cheezum, Viviany R Taqueti, Takashi Kato, Courtney R Bibbo, Jon Hainer, Sharmila Dorbala, Ron Blankstein, Marcelo F Di Carli
Microvascular rarefaction is found in experimental uremia, but data from patients with chronic kidney disease (CKD) are limited. We therefore quantified absolute myocardial blood flow and coronary flow reserve (the ratio of peak to resting flow) from myocardial perfusion positron emission tomography scans at a single institution. Individuals were classified into standard CKD categories based on the estimated glomerular filtration rate. Associations of coronary flow reserve with CKD stage and cardiovascular mortality were analyzed in models adjusted for cardiovascular risk factors...
October 13, 2017: Kidney International
https://www.readbyqxmd.com/read/29032473/oligosaccharide-biotechnology-an-approach-of-prebiotic-revolution-on-the-industry
#16
REVIEW
Mario Cezar Rodrigues Mano, Iramaia Angélica Neri-Numa, Juliana Bueno da Silva, Bruno Nicolau Paulino, Marina Gabriel Pessoa, Gláucia Maria Pastore
Oligosaccharides are polymers with two to ten monosaccharide residues which have sweetener functions and sensory characteristics, in addition to exerting physiological effects on human health. The ones called nondigestible exhibit a prebiotic behavior being fermented by colonic microflora or stimulating the growth of beneficial bacteria, playing roles in the immune system, protecting against cancer, and preventing cardiovascular and metabolic issues. The global prebiotics market is expected to grow around 12...
October 14, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29030153/potassium-homeostasis-in-health-and-disease-a-scientific-workshop-cosponsored-by-the-national-kidney-foundation-and-the-american-society-of-hypertension
#17
Csaba P Kovesdy, Lawrence J Appel, Morgan E Grams, Lisa Gutekunst, Peter A McCullough, Biff F Palmer, Bertram Pitt, Dominic A Sica, Raymond R Townsend
While much emphasis, and some controversy, centers on recommendations for sodium intake, there has been considerably less interest in recommendations for dietary potassium intake, in both the general population and patients with medical conditions, particularly acute and chronic kidney disease. Physiology literature and cohort studies have noted that the relative balance in sodium and potassium intakes is an important determinant of many of the sodium-related outcomes. A noteworthy characteristic of potassium in clinical medicine is the extreme concern shared by many practitioners when confronted by a patient with hyperkalemia...
October 6, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/29029974/altered-cardiac-gene-expression-of-noradrenaline-enzymes-transporter-and-%C3%AE-adrenoceptors-in-rat-model-of-rheumatoid-arthritis
#18
Sladjana Dronjak, Bojana Stefanovic, Predrag Jovanovic, Natasa Spasojevic, Milica Jankovic, Ivica Jeremic, Markus Hoffmann
Baseline sympathetic activity was found to be elevated in rheumatoid arthritis (RA) patients and it is related to increased cardiovascular risk in these patients. Although many studies have highlighted the association between RA and increased cardiac sympathetic activity, the underlying mechanistic links remain unclear. The aim of the present study was to understand how diseases-triggered changes in gene expression may result in maladaptive physiological changes. Our results suggest that the equilibrium between noradrenaline synthesis, release and reuptake was disrupted in the ventricles of arthritic rats...
October 6, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/29029808/potassium-homeostasis-in-health-and-disease-a-scientific-workshop-cosponsored-by-the-national-kidney-foundation-and-the-american-society-of-hypertension
#19
Csaba P Kovesdy, Lawrence J Appel, Morgan E Grams, Lisa Gutekunst, Peter A McCullough, Biff F Palmer, Bertram Pitt, Dominic A Sica, Raymond R Townsend
While much emphasis, and some controversy, centers on recommendations for sodium intake, there has been considerably less interest in recommendations for dietary potassium intake, in both the general population and patients with medical conditions, particularly acute and chronic kidney disease. Physiology literature and cohort studies have noted that the relative balance in sodium and potassium intakes is an important determinant of many of the sodium-related outcomes. A noteworthy characteristic of potassium in clinical medicine is the extreme concern shared by many practitioners when confronted by a patient with hyperkalemia...
September 29, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/29029392/spermine-and-spermidine-reversed-age-related-cardiac-deterioration-in-rats
#20
Hao Zhang, Junying Wang, Lingxu Li, Nannan Chai, Yuhan Chen, Feixiang Wu, Weihua Zhang, Lina Wang, Sa Shi, Li Zhang, Shuling Bian, Changqing Xu, Ye Tian, Yajun Zhao
Aging is the most important risk factor for cardiovascular disease (CVD). Slowing or reversing the physiological impact of heart aging may reduce morbidity and mortality associated with age-related CVD. The polyamines, spermine (SP) and spermidine (SPD) are essential for cell growth, differentiation and apoptosis, and levels of both decline with age. To explore the effects of these polyamines on heart aging, we administered SP or SPD intraperitoneally to 22- to 24-month-old rats for 6 weeks. Both treatments reversed and inhibited age-related myocardial morphology alterations, myocardial fibrosis, and cell apoptosis...
September 12, 2017: Oncotarget
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