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Query: UMLS:C0018799 (heart disease)
 34,133 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Some patients with obstructive sleep apnoea syndrome (OSAS; respiratory distress index (RDI) of >5 events.h(-1)) experience residual excessive daytime subjective sleepiness (Epworth Sleepiness Scale (ESS) score of >10), despite adequate use of continuous positive airway pressure (CPAP) therapy. The aim of the present study was to identify clinical and polysomnographic predictors of this sleepiness. Clinical and polysomnographic variables and ESS score were evaluated in 208 OSAS patients with an ESS score of >10 before (initial assessment) and after > or =6 months of adequate (> or =4 h.day(-1)) CPAP use. Following CPAP treatment, 114 (55%) patients showed an abnormal ESS score (>10; CPAP nonresponders), whereas 94 (45%) showed a normal ESS score (<11; CPAP responders). Of the CPAP responders, none had a history of depression, whereas the converse was true for 38.8% of CPAP nonresponders. In addition, multivariate logistic regression analysis revealed that the independent predictors of residual excessive daytime sleepiness following CPAP therapy were a history of diabetes and heart disease, and a higher ESS score and lower RDI on initial assessment. In conclusion, predictors of residual excessive sleepiness in adequately CPAP-treated OSAS were a history of depression, diabetes and heart disease, and a higher ESS score and lower RDI on initial assessment.
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PMID:Predictors of residual sleepiness in adequately treated obstructive sleep apnoea patients. 1935 51

This article examines the relationships between allergic rhinitis and hypertension, chronic sinusitis and hypertension, and asthma and hypertension. Previous studies have demonstrated that men reporting seasonal or chronic rhinitis had on average a 3.5 mm Hg higher systolic blood pressure than those without allergic rhinitis. Proposed mechanisms to the relationship between allergic rhinitis and sinusitis with hypertension may lie in the pathway of obstructive sleep apnea via neurohumoral responses to hypoxemia. Asthmatics were 1.4 times more likely to have heart disease, and 1.3 times more likely to have high blood pressure, than non-asthmatics. The commonality of immunological dysfunction and inflammation between diseases of allergy and those mediated by hypertension and other vascular disorders may explain the correlations observed. Interestingly, obese individuals have higher levels of circulating IL-6, leptin and TNF-alpha skewing the immune system toward the allergen-reactive type 2 helper T-cell. This would mean that obese individuals were predisposed to diseases of chronic inflammation. The implications of allergic rhinitis, chronic sinusitis, and asthma deserve closer attention, especially into the possibility of co-morbidity for hypertension. Although associations between allergic diseases and hypertension have been reported, more studies need to be performed to elucidate the mechanisms behind such associations.
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PMID:Allergic respiratory disease as a potential co-morbidity for hypertension. 2086 73

Obstructive sleep apnea is an underrecognized and underdiagnosed medical condition, with a myriad of negative consequences on patients' health and society as a whole. Symptoms include daytime sleepiness, loud snoring, and restless sleep. While the "gold standard" of diagnosis is by polysomnography, a detailed history and focused physical examination may help uncover previously undiagnosed cases. Undetected obstructive sleep apnea can lead to hypertension, heart disease, depression, and even death. Several modalities exist for treating obstructive sleep apnea, including continuous positive airway pressure, oral appliances, and several surgical procedures. However, conservative approaches, such as weight loss and alcohol and tobacco cessation, are also strongly encouraged in the patient with obstructive sleep apnea. With increased awareness, both the medical community and society as a whole can begin to address this disease and help relieve the negative sequelae that result from it.
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PMID:Obstructive sleep apnea: a growing problem. 2160 32

Obstructive sleep apnea (OSA) affects millions of Americans and is estimated to be as prevalent as asthma and diabetes. Given the fact that obesity is a major risk factor for OSA, and given the current global rise in obesity, the prevalence of OSA will increase in the future. Individuals with sleep apnea are often unaware of their sleep disorder. It is usually first recognized as a problem by family members who witness the apneic episodes or is suspected by their primary care doctor because of the individual's risk factors and symptoms. The vast majority remain undiagnosed and untreated, despite the fact that this serious disorder can have significant consequences. Individuals with untreated OSA can stop breathing hundreds of times a night during their sleep. These apneic events can lead to fragmented sleep that is of poor quality, as the brain arouses briefly in order for the body to resume breathing. Untreated, sleep apnea can have dire health consequences and can increase the risk of hypertension, diabetes, heart disease, and heart failure. OSA management has also become important in a number of comorbid neurological conditions, including epilepsy, stroke, multiple sclerosis, and headache. Diagnosis typically involves use of screening questionnaires, physical exam, and an overnight polysomnography or a portable home study. Treatment options include changes in lifestyle, positive airway pressure, surgery, and dental appliances.
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PMID:Obstructive sleep apnea. 2236 74

Childhood obesity has reached epidemic proportions in many parts of the world. This epidemic has also affected children and adults with congenital heart disease (CHD). Over one quarter of children with CHD are overweight or obese. Important comorbidities are associated with obesity including type 2 diabetes, systemic hypertension, hyperlipidemia, and obstructive sleep apnea. Obese children with CHD often have the traditional risk factors such as genetic predisposition, sedentary lifestyle, and poor dietary habits. However, they may also have unique risk factors such as higher caloric needs in early infancy and exercise restriction in childhood. Similar to children with normal hearts, those with CHD have higher left ventricular mass and abnormal vascular function and are more likely to have systemic hypertension. In the long term, these comorbidities may have a more profound effect on children who have underlying functional and/or anatomical abnormalities of the heart. As more children with CHD are now surviving into adulthood, investigating therapeutic interventions to treat and prevent obesity in this population is of utmost importance. Recommendations for safe physical activity, recreation sport, and exercise training for children with CHD have recently been published. These guidelines may help health care providers to change their practice of exercise restriction.
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PMID:Clinical practice: the effect of obesity in children with congenital heart disease. 2254 15

Obstructive sleep apnea (OSA) is a highly prevalent respiratory disorder of sleep, and associated with chronic intermittent hypoxia (CIH). Experimental evidence indicates that CIH is a unique physiological state with potentially "adaptive" and "maladaptive" consequences for cardio-respiratory homeostasis. CIH is also a critical element accounting for most of cardiovascular complications of OSA. Cardiac response to CIH is time-dependent, showing a transition from cardiac compensative (such as hypertrophy) to decompensating changes (such as failure). CIH-provoked mild and transient oxidative stress can induce adaptation, but severe and persistent oxidative stress may provoke maladaptation. Hydrogen peroxide as one of major reactive oxygen species plays an important role in the transition of adaptive to maladaptive response to OSA-associated CIH. This may account for the fact that although oxidative stress has been recognized as a driver of cardiac disease progression, clinical interventions with antioxidants have had little or no impact on heart disease and progression. Here we focus on the role of hydrogen peroxide in CIH and OSA, trying to outline the potential of antioxidative therapy in preventing CIH-induced cardiac damage.
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PMID:Cardiac response to chronic intermittent hypoxia with a transition from adaptation to maladaptation: the role of hydrogen peroxide. 2268 19

Pulmonary Hypertension (PH) associated to chronic respiratory diseases is currently classified in the 3rd group, as a mild to moderate form of pre-capillary PH that progressively complicates the prognosis of associated pulmonary disease. In clinical practice, however, some unresolved issues in the respiratory PH should be considered: 1) the PH heterogeneity in some respiratory diseases, such as Chronic Obstructive Pulmonary Disease (COPD), where the prevalence of unrecognized left heart disease, or chronic pulmonary thromboembolism may change the clinical classification; 2) the combining form of severe PH which often is not correlated to chronic ventilator impairment, while outcome is strictly related to pulmonary haemodynamics. The recognition of out of proportion respiratory PH in several chronic respiratory diseases which include COPD, Idiopathic Pulmonary Fibrosis (IPF), Combined Pulmonary Fibrosis and Emphysema, Obstructive Sleep Apnea (OSA), Obesity Hypoventilation Syndrome (OHS) may be important for a comprehensive clinical classification of severe respiratory PH, as well as, for the inclusion of these patients in randomized clinical trials on PH targeted therapy.
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PMID:Clinical variability of respiratory pulmonary hypertension: implications for diagnosis and management. 2428 Feb 32

Although sleep-disordered breathing has been extensively studied in patients with left-ventricular dysfunction, little is known of its prevalence in adults with congenital heart disease. Patients with d-looped transposition of the great arteries (d-TGA) who have undergone atrial switch procedures often develop progressive heart failure. The objective of this study was to determine the prevalence of patients at risk for sleep-disordered breathing in adults with d-TGA and atrial switch procedures compared with a control population. Thirty-two patients with d-TGA (66 % males, median age 31) were compared with 32 healthy controls. Baseline demographics and clinical characteristics were documented. The snoring, tiredness during daytime, observed apnea, and high blood pressure (STOP) questionnaire was used to identify subjects at risk for obstructive sleep apnea (OSA). There was no difference in baseline demographics between subjects and controls. For the STOP questionnaire, 14 subjects with d-TGA had scores predictive of OSA compared with three in the control group (44 vs. 9 %, p = 0.0038). There was no difference in functional status between d-TGA patients with or without OSA. There is a greater prevalence of risk for sleep disordered breathing in adults with d-TGA compared with controls. Further prospective investigation with sleep studies will be valuable to confirm these findings.
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PMID:Risk for sleep-disordered breathing in adults after atrial switch repairs for d-looped transposition of the great arteries. 2450 56

Atrial fibrillation (AF) is the most common arrhythmia (estimated lifetime risk, 22%-26%). The aim of this article is to review the clinical epidemiological features of AF and to relate them to underlying mechanisms. Long-established risk factors for AF include aging, male sex, hypertension, valve disease, left ventricular dysfunction, obesity, and alcohol consumption. Emerging risk factors include prehypertension, increased pulse pressure, obstructive sleep apnea, high-level physical training, diastolic dysfunction, predisposing gene variants, hypertrophic cardiomyopathy, and congenital heart disease. Potential risk factors are coronary artery disease, kidney disease, systemic inflammation, pericardial fat, and tobacco use. AF has substantial population health consequences, including impaired quality of life, increased hospitalization rates, stroke occurrence, and increased medical costs. The pathophysiology of AF centers around 4 general types of disturbances that promote ectopic firing and reentrant mechanisms, and include the following: (1) ion channel dysfunction, (2) Ca(2+)-handling abnormalities, (3) structural remodeling, and (4) autonomic neural dysregulation. Aging, hypertension, valve disease, heart failure, myocardial infarction, obesity, smoking, diabetes mellitus, thyroid dysfunction, and endurance exercise training all cause structural remodeling. Heart failure and prior atrial infarction also cause Ca(2+)-handling abnormalities that lead to focal ectopic firing via delayed afterdepolarizations/triggered activity. Neural dysregulation is central to atrial arrhythmogenesis associated with endurance exercise training and occlusive coronary artery disease. Monogenic causes of AF typically promote the arrhythmia via ion channel dysfunction, but the mechanisms of the more common polygenic risk factors are still poorly understood and under intense investigation. Better recognition of the clinical epidemiology of AF, as well as an improved appreciation of the underlying mechanisms, is needed to develop improved methods for AF prevention and management.
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PMID:The clinical profile and pathophysiology of atrial fibrillation: relationships among clinical features, epidemiology, and mechanisms. 2476 64

The prevalence of obesity increases and is associated with increases in co-morbidities e.g. type 2 diabetes, hyperlipidemia, hypertension, obstructive sleep apnea, heart disease, stroke, asthma, several forms of cancer, depression, and may result in reduction of expected remaining lifespan. We have reviewed the adverse effects on the cardiovascular system of anti-obesity drugs now retracted from the market as well as the cardiovascular profile of current drugs and potential pathways which are considered for treatment of obesity. Fenfluramine, and sibutramine were withdrawn due to increased cardiovascular risk, while an inverse agonist at cannabinoid type 1 (CB1) receptors, rimonobant was withdrawn due to serious psychiatric problems. At present there are only few treatments available including orlistat and, phentermine alone or in combination with topiramate and lorcaserin, although cardiovascular side effects need to be clarified regarding phentermine and lorcaserin. Drugs approved for type 2 diabetes including glucagon like peptide (GLP-1) analogues and metformin also cause moderate weight losses and have a favourable cardiovascular profile, while the anti-obesity potential of nebivolol remains unexplored. Pathways with anti-obesity potential include sirtuin activation, blockade of transient receptor potential (TRPV1) channels, acetyl-CoA carboxylase 1 and 2 inhibitors, uncoupling protein activators, bile acids, crotonins, CB1 antagonists, but the cardiovascular profile remains to be investigated. For type 2 diabetes, new drug classes with possible advantageous cardiovascular profiles, e.g. GLP-1 analogues and sodium-glucose co-transport type 2 inhibitors, are associated with weight loss and are currently being evaluated as anti-obesity drugs.
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PMID:Cardiovascular effects of current and future anti-obesity drugs. 2484 38


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