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https://www.readbyqxmd.com/read/29228345/mechanisms-and-mediators-of-hypertension-induced-by-erythropoietin-and-related-molecules
#1
Rajiv Agarwal
Hypertension is a common but frequently overlooked adverse effect of erythropoietin (EPO) therapy. Underreporting of hypertension with EPO is likely due to either more aggressively managing hypertension through the prescription of antihypertensive drugs or closer attention to dry weight. The purpose and focus of this review is to critically evaluate the mechanisms of EPO-induced hypertension. Preclinical data are considered first, followed by clinical data where available. Mediated by a variety of molecules, there is an imbalance in the vascular tone favoring net vasoconstriction that mediates EPO-induced hypertension...
December 8, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/29224042/association-between-continuous-positive-airway-pressure-and-serum-aminotransferases-in-patients-with-obstructive-sleep-apnea
#2
Li-Da Chen, Liang-Ji Zhang, Xue-Jun Lin, Jia-Chao Qi, Hao Li, Zhi Wu, Qiao-Zhen Xu, Ya-Ping Huang, Li Lin
INTRODUCTION: Obstructive sleep apnea (OSA) has been suggested to be a potential contributing factor for nonalcoholic fatty liver disease (NAFLD). Studies on the association between continuous positive airway pressure (CPAP) and NAFLD in OSA patients are limited and controversial. OBJECTIVES: The aim of this study was to assess the relationship between OSA and NAFLD and the effect of CPAP therapy on serum aminotransferase levels in OSA patients. METHODS: A total of 160 consecutive patients who underwent standard polysomnography were enrolled...
December 9, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29221483/the-role-of-sleepiness-on-arterial-stiffness-improvement-after-cpap-therapy-in-males-with-obstructive-sleep-apnea-a-prospective-cohort-study
#3
Maria Alexandra Mineiro, Pedro Marques da Silva, Marta Alves, Ana Luísa Papoila, Maria João Marques Gomes, João Cardoso
BACKGROUND: Obstructive sleep apnea (OSA) is associated with increased cardiovascular risk. This study aim to assess differences in changes in arterial stiffness of two groups of patients, defined as having daytime sleepiness or not, after continuous positive airway pressure (CPAP) treatment. METHODS: A selected cohort of consecutive male patients, under 65 years old, with moderate to severe OSA and without great number of comorbidities was studied. The diagnosis was confirmed by home respiratory poligraphy...
December 8, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/29217205/increased-urinary-erythropoietin-excretion-in-severe-sleep-apnea-hipoapnea-syndrome-the-effect-of-cpap
#4
Miquel Félez, Nuria Grau, Antonia Ruiz, Encarna Guardiola, Carles Sanjuas, Cristina Estirado, Maribel Navarro-Muñoz, Antoni Pascual, Mauricio Orozco-Levi, Joaquim Gea
INTRODUCTION: Tissue hypoxia stimulates the production of erythropoietin (EPO), the main effect of which is, in turn, to stimulate erythropoiesis. Sleep apnea-hypopnea syndrome (SAHS) is an entity characterized by repeated episodes of hypoxemia during sleep. OBJECTIVE: To analyze whether hypoxemia stimulated increased urinary excretion of EPO, and if so, to evaluate if treatment with continuous positive airway pressure (CPAP) can inhibit this phenomenon. METHODS: We studied 25 subjects with suspected SAHS who underwent a polysomnography study (PSG)...
December 4, 2017: Archivos de Bronconeumología
https://www.readbyqxmd.com/read/29215742/effects-of-small-interfering-rna-targeting-tlr4-on-expressions-of-adipocytokines-in-obstructive-sleep-apnea-hyponea-syndrome-with-hypertension-in-a-rat-model
#5
Jing-Guo Wu, Nan Xun, Li-Jin Zeng, Zhen-Yu Li, Yan-Bing Liang, Hao Tang, Zhong-Fu Ma
We explored the effects of RNA interference-mediated silencing of TLR4 gene on expressions of adipocytokines in obstructive sleep apnea hyponea syndrome (OSAS) with hypertension in a rat model. Systolic blood pressure of caudal artery and physiological changes were observed when establishing rat models of OSAS with hypertension. Mature rat adipocytes were induced from separated and cultured primary rat adipocytes. To transfect rat mature adipocytes, TLR4 siRNA group and negative control (NC) siRNA group were established...
December 7, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29212465/association-of-24%C3%A2-h-systolic-blood-pressure-variability-and-cardiovascular-disease-in-patients-with-obstructive-sleep-apnea
#6
Xiao Ke, Yan Sun, Rongfeng Yang, Jiawen Liang, Shaoyun Wu, Chengheng Hu, Xing Wang
BACKGROUND: To evaluate association of 24 h-systolic blood pressure (SBP) variability and obstructive sleep apnea (OSA) as defined by the apnea-hypopnea index ≥5/h; and association of 24 h-SBP variability and prevalent cardiovascular disease (CVD) in OSA patients. METHODS: Participants underwent polysomongraphy to evaluate the presence of OSA, and 24 h-ambulatory blood pressure monitoring was applied to evaluate 24 h-SBP variability as indexed by weighted 24 h-standard deviation (SD) of SBP...
December 6, 2017: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/29211322/perivascular-adipose-tissue-and-the-dynamic-regulation-of-kv-7-and-kir-channels-implications-to-resistant-hypertension
#7
Maik Gollasch, Donald G Welsh, Rudolf Schubert
Resistant hypertension is defined as high blood pressure that remains uncontrolled despite treatment with at least three antihypertensive drugs at adequate doses. Resistant hypertension is an increasingly common clinical problem in older age, obesity, diabetes, sleep apnea, and chronic kidney disease. Although the direct vasodilator minoxidil was introduced in the early 1970s, only recently has this drug been shown to be particularly effective in a subgroup of patients with treatment-resistant or uncontrolled hypertension...
December 6, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29197986/relationships-between-mri-fat-distributions-and-sleep-apnea-and-obesity-hypoventilation-syndrome-in-very-obese-patients
#8
C D Turnbull, S H Wang, A R Manuel, B T Keenan, A G McIntyre, R J Schwab, J R Stradling
PURPOSE: Obesity is associated with both obstructive sleep apnea (OSA) and obesity hypoventilation. Differences in adipose tissue distribution are thought to underlie the development of both OSA and hypoventilation. We explored the relationships between the distribution of upper airway, neck, chest, abdominal and muscle fat in very obese individuals. METHODS: We conducted a cross-sectional cohort study of individuals presenting to a tertiary sleep clinic or for assessment for bariatric surgery...
December 2, 2017: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/29195726/cardiovascular-effects-of-oral-appliance-therapy-in-obstructive-sleep-apnea-a-systematic-review-and-meta-analysis
#9
REVIEW
Grietje E de Vries, Peter J Wijkstra, Ewout J Houwerzijl, Huib A M Kerstjens, Aarnoud Hoekema
Obstructive sleep apnea (OSA) is associated with increased cardiovascular morbidity and mortality. This study systematically reviews the effects of oral appliance therapy (OAT) on a broad spectrum of cardiovascular outcomes. A literature search was performed up to December 31st 2016. Twenty-five relevant full-text articles were retrieved. Sixteen articles were considered methodologically sufficient, including 11 randomized controlled trials. Pooled data of the RCTs showed significant reductions in daytime systolic and diastolic blood pressure compared to baseline, but no significant reductions in heart rate, except for daytime heart rate when compared to inactive/placebo OAT...
October 26, 2017: Sleep Medicine Reviews
https://www.readbyqxmd.com/read/29188162/obstructive-sleep-apnea-an-unusual-cause-of-hemorrhagic-stroke
#10
Nilesh H Pawar, Jennifer A O'Riordan, Preeti Malik, Farhad F Vasanwala
Stroke is one of the most common causes of mortality and morbidity worldwide. Hemorrhagic stroke comprises 10-20% of strokes. Here, we present a case report of hemorrhagic stroke that may have been secondary to untreated Obstructive Sleep Apnea (OSA) in a young man with no other cardiovascular risk factors or features of metabolic syndrome. A 32-year-old man was admitted for hemorrhagic stroke. An initial thorough workup for the etiology of stroke was inconclusive. Eventually, a polysomnography was done, which demonstrated OSA suggesting that untreated OSA may have contributed to his stroke...
September 27, 2017: Curēus
https://www.readbyqxmd.com/read/29187390/phenotyping-of-sleep-disordered-breathing-in-patients-with-chronic-heart-failure-with-reduced-ejection-fraction-the-schlahf-registry
#11
Michael Arzt, Olaf Oldenburg, Andrea Graml, Erland Erdmann, Helmut Teschler, Karl Wegscheider, Anna Suling, Holger Woehrle
BACKGROUND: Different sleep-disordered breathing (SDB) phenotypes, including coexisting obstructive and central sleep apnea (OSA-CSA), have not yet been characterized in a large sample of patients with heart failure and reduced ejection fraction (HFrEF) receiving guideline-based therapies. Therefore, the aim of the present study was to determine the proportion of OSA, CSA, and OSA-CSA, as well as periodic breathing, in HFrEF patients with SDB. METHODS AND RESULTS: The German SchlaHF registry enrolled patients with HFrEF receiving guideline-based therapies, who underwent portable SDB monitoring...
November 29, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29172793/impact-of-obstructive-sleep-apnea-on-blood-pressure-and-cardiovascular-risk-factors-in-japanese-men-a-cross-sectional-study-in-work-site-group
#12
Yuki Morinaga, Kiyoshi Matsumura, Yasuo Kansui, Satoko Sakata, Kenichi Goto, Yoshie Haga, Emi Oishi, Takunori Seki, Toshio Ohtsubo, Takanari Kitazono
It has been shown that obstructive sleep apnea (OSA) is related to hypertension and cardiovascular disease; however, the prevalence of OSA in general population and the impact of it on blood pressure especially in Japan has not been well determined. We have conducted a screening test for OSA from 2003 to 2011. In addition, a cross-sectional analysis was performed in 2012 to determine the association of OSA and cardiovascular risk factors in Japanese men (18-69 years of age; mean age, 44.4 ± 0.2). The study group consisted of 2208 male employees, and OSA was evaluated by using the 4% oxygen desaturation index and apnea-hypopnea index (AHI)...
November 27, 2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/29164122/changes-in-expression-of-the-clock-gene-in-obstructive-sleep-apnea-syndrome-patients-are-not-reverted-by-continuous-positive-airway-pressure-treatment
#13
Susana Moreira, Raquel Rodrigues, André B Barros, Nadja Pejanovic, Ana Neves-Costa, Dora Pedroso, Cláudia Pereira, Dina Fernandes, João Valença Rodrigues, Cristina Barbara, Luís Ferreira Moita
Purpose: Metabolic syndrome and cardiovascular disease are strongly associated with obstructive sleep apnea syndrome (OSAS), which causes substantial changes to normal circadian physiological functions, including metabolic pathways. Because core clock genes are known to be modulated by sleep/vigilance cycles, we asked whether the expression level of mRNA coding for clock genes is altered in non-treated OSAS patients and if it can be corrected by standard continuous positive airway pressure (CPAP) treatment...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/29157582/serum-lipid-profile-sleep-disordered-breathing-and-blood-pressure-in-the-elderly-a-10-year-follow-up-of-the-proof-synapse-cohort
#14
Denis Monneret, Jean-Claude Barthélémy, David Hupin, Delphine Maudoux, Sébastien Celle, Emilia Sforza, Frédéric Roche
OBJECTIVES: Dyslipidemia, sleep-disordered breathing (SDB) and hypertension are comorbid factors evidenced in adults, but poorly studied in old people. This study aimed to examine the long-term evolution of the serum lipid profile, and its relationships with SDB and blood pressure (BP) in the elderly. METHODS: A ten-year follow-up of the prospective Prognostic Indicator of Cardiovascular and Cerebrovascular Events (PROOF) and the Autonomic Nervous System Activity, Aging and Sleep Apnea/Hypopnea (SYNAPSE) cohort, which initially included 1011 elderly subjects from the general population, and who were untreated by continuous positive airway pressure (CPAP)...
November 2017: Sleep Medicine
https://www.readbyqxmd.com/read/29150775/influences-of-obstructive-sleep-apnea-on-blood-pressure-variability-might-not-be-limited-only-nocturnally-in-middle-aged-hypertensive-males
#15
Liang Shao, Mulalibieke Heizhati, Xiaoguang Yao, Yingchun Wang, Suofeiya Abulikemu, Delian Zhang, Ling Zhou, Jing Hong, Nanfang Li
PURPOSE: In this cross-sectional study, we analyzed the potential association between sleep measures and blood pressure variability. METHODS: Ninety-three middle-aged hypertensive males, who underwent polysomnography and 24-h ambulatory blood pressure monitoring, were enrolled. Blood pressure variability was assessed by blood pressure standard deviation. Obstructive sleep apnea (apnea hypopnea index ≥ 15) was diagnosed in 52 (55.91%) patients. Mean body mass index and age were 27...
November 17, 2017: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/29148180/dna-methylation-in-the-central-and-efferent-limbs-of-the-chemo-reflex-requires-carotid-body-neural-activity
#16
Jayasri Nanduri, Ying-Jie Peng, Ning Wang, Shakil A Khan, Gregg L Semenza, Nanduri R Prabhakar
Long-term exposure to intermittent hypoxia (LT-IH; 30 days), simulating blood O2 profiles during sleep apnea, has been shown to repress anti-oxidant enzyme (AOE) gene expression by DNA methylation in the carotid body (CB) reflex pathway, resulting in persistent elevation of plasma catecholamine levels and blood pressure. The present study examined the mechanisms by which LT-IH induces DNA methylation. Adult rats exposed to LT-IH showed elevated reactive oxygen species (ROS) in the CB, nucleus tractus solitarius (nTS) and rostroventrolateral medulla (RVLM) and adrenal medulla (AM), which represent the central and efferent limbs of the CB reflex, respectively...
November 17, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29148090/assessment-of-cumulative-health-risk-in-the-world-trade-center-general-responder-cohort
#17
Ghalib A Bello, Susan L Teitelbaum, Roberto G Lucchini, Christopher R Dasaro, Moshe Shapiro, Julia R Kaplan, Michael A Crane, Denise J Harrison, Benjamin J Luft, Jacqueline M Moline, Iris G Udasin, Andrew C Todd
BACKGROUND: Multiple comorbidities have been reported among rescue/recovery workers responding to the 9/11/2001 WTC disaster. In this study, we developed an index that quantifies the cumulative physiological burden of comorbidities and predicts life expectancy in this cohort. METHODS: A machine learning approach (gradient boosting) was used to model the relationship between mortality and several clinical parameters (laboratory test results, blood pressure, pulmonary function measures)...
November 17, 2017: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/29122399/-sleep-apneas-metabolic-syndrome-and-cardiovascular-risk-data-from-the-pays-de-la-loire-sleep-cohort
#18
REVIEW
F Gagnadoux, P Priou, T Urban, N Meslier, W Trzepizur
Obstructive sleep apnea-hypopnea syndrome (OSAHS) is a prevalent disease characterized by recurrent episodes of partial or complete obstruction of upper airway during sleep. Untreated moderate to severe OSAHS is recognized as a cardiovascular (CV) risk factor. Data from the Pays de la Loire sleep cohort and other clinic- or population-based cohorts demonstrate a strong association between OSAHS and the different components of the metabolic syndrome including systemic hypertension, diabetes and impaired lipid metabolism...
November 6, 2017: Revue de Pneumologie Clinique
https://www.readbyqxmd.com/read/29121095/the-pedunculopontine-tegmentum-controls-renal-sympathetic-nerve-activity-and-cardiorespiratory-activities-in-nembutal-anesthetized-rats
#19
Anne M Fink, Caron Dean, Mariann R Piano, David W Carley
Elevated renal sympathetic nerve activity (RSNA) accompanies a variety of complex disorders, including obstructive sleep apnea, heart failure, and chronic kidney disease. Understanding pathophysiologic renal mechanisms is important for determining why hypertension is both a common sequelae and a predisposing factor of these disorders. The role of the brainstem in regulating RSNA remains incompletely understood. The pedunculopontine tegmentum (PPT) is known for regulating behaviors including alertness, locomotion, and rapid eye movement sleep...
2017: PloS One
https://www.readbyqxmd.com/read/29115191/risk-factors-for-the-efficacy-of-oral-appliance-for-treating-obstructive-sleep-apnea-a-preliminary-study
#20
Geun-Shin Lee, Hye-Kyoung Kim, Mee-Eun Kim
Objective To identify potential risk factors of response to oral appliance in patients with obstructive sleep apnea (OSA). Methods Fifteen OSA patients were enrolled. Clinical characteristics, cephalometric measurements, and the results of home sleep testing were retrospectively obtained at baseline, and a sleep test was done again at the end of treatment. Results Twelve subjects were responders and three were non-responders. The diastolic blood pressure, minimum pulse rate, SNA (Angle between sella-nasion and nasion-A point), ANB (Anteroposterior maxilla/mandible discrepancy), and facial convexity of non-responders was higher than those of responders...
November 8, 2017: Cranio: the Journal of Craniomandibular Practice
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