Increased platelet activation in sleep apnea subjects with intermittent hypoxemia

AbstractPurposeObstructive sleep apnea (OSA) is independently associated with increased risk for stroke and other cardiovascular diseases. Since activated platelets play an important role in cardiovascular disease, the objective of this study was to determine whether platelet reactivity was altered in OSA subjects with intermittent nocturnal hypoxemia.MethodsThirty-one subjects, without hypertension or cardiovascular disease and not taking medication, participated in the study. Subjects were stratified based on OSA-related oxygen desaturation index (ODI) recorded during overnight polysomnography. Platelet reactivity to a broad panel of agonists (collagen, thrombin, protease-activated receptor1 hexapeptide, epinephrine, ADP) was measured by monitoring platelet aggregation and ATP secretion. Expression of platelet activation markers CD154 (CD40L) and CD62P (P-selectin) and platelet-monocyte aggregates (PMA) was quantified by flow cytometry.ResultsEpinephrine-induced platelet aggregation was substantially decreased in OSA subjects with significant intermittent hypoxemia (ODI  ≥ 15) compared with subjects with milder hypoxemia levels (ODI 
Source: Sleep and Breathing - Category: Respiratory Medicine Source Type: research

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mmittee of the Council on Clinical Cardiology; Council on Arteriosclerosis, Thrombosis and Vascular Biology; Council on Cardiovascular and Stroke Nursing; and Council on Lifestyle and Cardiometabolic Health Abstract Atrial fibrillation (AF), the most common sustained cardiac arrhythmia, is associated with substantial morbidity, mortality, and healthcare use. Great strides have been made in stroke prevention and rhythm control strategies, yet reducing the incidence of AF has been slowed by the increasing incidence and prevalence of AF risk factors, including obesity, physical inactivity, sleep apnea, diabetes melli...
Source: Circulation - Category: Cardiology Authors: Tags: Circulation Source Type: research
Abstract PURPOSE: Obstructive sleep apnea (OSA) is independently associated with increased risk for stroke and other cardiovascular diseases. Since activated platelets play an important role in cardiovascular disease, the objective of this study was to determine whether platelet reactivity was altered in OSA subjects with intermittent nocturnal hypoxemia. METHODS: Thirty-one subjects, without hypertension or cardiovascular disease and not taking medication, participated in the study. Subjects were stratified based on OSA-related oxygen desaturation index (ODI) recorded during overnight polysomnography. Platel...
Source: Sleep and Breathing - Category: Sleep Medicine Authors: Tags: Sleep Breath Source Type: research
Conclusions: Embolism associated with asymptomatic carotid stenosis shows circadian variation with highest rates 4–6 h before midday. This corresponds with peak circadian incidence of stroke and other vascular complications. These and ASED Study results show that monitoring frequency, duration, and time of day are important in ES detection. Introduction Transcranial Doppler (TCD) detected microembolism in the ipsilateral middle cerebral artery (MCA) may help stratify the risk of stroke and other arterial disease complications in persons with advanced (≥60%) asymptomatic carotid stenosis. If so, this techniqu...
Source: Frontiers in Neurology - Category: Neurology Source Type: research
Authors: Meinel TR, Pult F, Gralla J, Arnold M, Bassetti C, Jung S Abstract A 76-year-old man with a history of arterial hypertension, obstructive sleep apnea, dyslipidemia, family history of cardiovascular events, prestroke and overweight presented 90 minutes after acute onset of right-sided sensorimotor hemiparesis, hemiataxia and dysarthria (National Institutes of Health Stroke Scale (NIHSS) 9/42). Magnetic resonance imaging (MRI) revealed a pontine ischemia and MR angiography showed a thrombus in the middle to distal portion of the basilar artery. Owing to the location, an occlusion of one lumen of a fenestrate...
Source: Interventional Neuroradiology - Category: Radiology Tags: Interv Neuroradiol Source Type: research
Publication date: March 2018Source: Advances in Medical Sciences, Volume 63, Issue 1Author(s): Ewelina Michniewicz, Elżbieta Mlodawska, Paulina Lopatowska, Anna Tomaszuk-Kazberuk, Jolanta MalyszkoAbstractCoronary artery disease (CAD) is the most common cardiovascular disease while atrial fibrillation (AF) is the most common cardiac arrhythmia. Both diseases share associated risk factors – hypertension, diabetes mellitus, sleep apnea, obesity and smoking. Moreover, inflammation plays a causative role in both diseases. The prevalence of CAD in patients with AF is from 17% to 46.5% while the prevalence of AF among pati...
Source: Advances in Medical Sciences - Category: Biomedical Science Source Type: research
Authors: Batul SA, Gopinathannair R Abstract Atrial fibrillation (AF) and heart failure (HF) are growing cardiovascular disease epidemics worldwide. There has been an exponential increase in the prevalence of AF and HF correlating with an increased burden of cardiac risk factors and improved survival rates in patients with structural heart disease. AF is associated with adverse prognostic outcomes in HF and is most evident in mild-to-moderate left ventricular (LV) dysfunction where the loss of "atrial kick" translates into poorer quality of life and increased mortality. In the absence of underlying struct...
Source: Korean Circulation Journal - Category: Cardiology Tags: Korean Circ J Source Type: research
Publication date: March 2018 Source:Advances in Medical Sciences, Volume 63, Issue 1 Author(s): Ewelina Michniewicz, Elżbieta Mlodawska, Paulina Lopatowska, Anna Tomaszuk-Kazberuk, Jolanta Malyszko Coronary artery disease (CAD) is the most common cardiovascular disease while atrial fibrillation (AF) is the most common cardiac arrhythmia. Both diseases share associated risk factors – hypertension, diabetes mellitus, sleep apnea, obesity and smoking. Moreover, inflammation plays a causative role in both diseases. The prevalence of CAD in patients with AF is from 17% to 46.5% while the prevalence of AF among patients ...
Source: Advances in Medical Sciences - Category: Biomedical Science Source Type: research
Abstract Coronary artery disease (CAD) is the most common cardiovascular disease while atrial fibrillation (AF) is the most common cardiac arrhythmia. Both diseases share associated risk factors - hypertension, diabetes mellitus, sleep apnea, obesity and smoking. Moreover, inflammation plays a causative role in both diseases. The prevalence of CAD in patients with AF is from 17% to 46.5% while the prevalence of AF among patients with CAD is low and it is estimated from 0.2% to 5%. AF is a well-established factor of poor short- and long-term prognosis in patients with acute myocardial infarction (AMI) and is associ...
Source: Advances in Medical Sciences - Category: Biomedical Science Authors: Tags: Adv Med Sci Source Type: research
Please wait while the activity loads. If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled. If loading fails, click here to try again Click on the 'Start' button to begin the mock test. After answering all questions, click on the 'Get Results' button to display your score and the explanations. There is no time limit for this mock test. Start Congratulations - you have completed DM / DNB Cardiology Entrance Mock Test 7. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rate...
Source: Cardiophile MD - Category: Cardiology Authors: Tags: Cardiology MCQ DM / DNB Cardiology Entrance Featured Source Type: blogs
Abstract ABSTRACT: The first of this two part series on critical illness in pregnancy dealt with obstetric disorders. In Part II, medical conditions that commonly affect pregnant women or worsen during pregnancy are discussed. ARDS occurs more frequently in pregnancy. Strategies commonly used in non-pregnant patients including permissive hypercapnia, limits for plateau pressure, prone positioning may not be acceptable especially in late pregnancy. Genital tract infections unique to pregnancy include chorioamionitis, Group A streptococcal infection causing toxic shock syndrome, and polymicrobial infection with stre...
Source: Chest - Category: Respiratory Medicine Authors: Tags: Chest Source Type: research
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