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Query: UMLS:C0018801 (heart failure)
 72,216 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Sleep related periodic breathing with recurrent episodes of apnea and hypopnea is known to occur in patients with heart failure. We investigated the prevalence of sleep related breathing disorders (SRBD) in 14 outpatients on a heart transplant waiting list. All were younger than 60 years and had severe stable heart failure. Three patients (21%) exhibited 10 or more apneas and hypopneas per hour of sleep; these apneas and hypopneas were predominantly of the central type and occurred during Cheyne-Stokes respiration. There were no statistically significant differences between the apneic and non-apneic group in terms of age, left ventricular ejection fraction or pulmonary function tests. The group with SRBD had worse quality of life and less tolerance to exercise.
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PMID:Prevalence of sleep breathing disorders in outpatients on a heart transplant waiting list. 1296 58

Cheyne-Stokes respiration (CSR) is a form of periodic breathing associated with oscillations in heart rate (HR) and blood pressure (BP), which have previously been attributed to the effects of intermittent hypoxia and arousals from sleep. We herein review the major findings from a series of experiments, in which we explored the possibility that the ventilatory oscillations of CSR can independently modulate HR and BP. Using frequency spectral analysis, we showed that CSR in patients with heart failure causes oscillations in HR and BP that are eliminated by abolition of ventilatory oscillations, but persist during administration of supplemental O2 sufficient to prevent hypoxia. Analysis of the effects of arousals showed they have little or no effect on HR or BP independent of associated changes in ventilation. Finally, we showed that during simulated CSR, healthy awake patients were able to cause HR and BP oscillations in the absence of hypoxia or arousals. We conclude that ventilatory oscillations during Cheyne-Stokes respiration can modulate HR and BP independent of the effects of hypoxia and arousals from sleep.
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PMID:Respiratory modulation of heart rate and blood pressure during Cheyne-Stokes respiration. 1471 37

Cheyne-Stokes Respiration (CSR) is a breathing pattern characterised by rhythmic oscillation of tidal volume with regularly recurring periods of hyperpnoea, hypopnoea and apnoea. CSR is no longer solely regarded as a symptom of severe congestive heart failure (CHF), but has been recognised as an independent risk factor for worsening heart failure and reduced survival in patients with CHF. CSR is associated with frequent awakening that fragment sleep and with concomitant sympathetic activation both of which may worsen CHF. Cheyne-Stokes Respiration is very common in patients with severe CHF and its prevalence may have been underestimated in the past due to technical limitations that precluded respiratory monitoring outside sleep laboratories. Since treatment of CSR appears to be beneficial and safe, patients at risk should be promptly diagnosed and treated. Treatment of CSR has been demonstrated to improve left ventricular ejection fraction and potentially prolongs survival in patients with severe CHF. This article briefly summarises the current knowledge of the patho-physiology, prevalence and therapy of Cheyne-Stokes respiration.
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PMID:Cheyne-Stokes respiration in patients with congestive heart failure. 1474 66

A patient with chronic heart failure and chronic respiratory failure (CRF) underwent ambulatory polysomnography at home. She was found dead on the morning after the recording. The tracings confirmed severe sleep apnea syndrome. After 8 h of incessant Cheyne-Stokes respiration during sleep, respiratory arrest occurred, followed 7 min later by asystole. This report illustrates a case of respiratory drive failure during sleep as the mode of death in a patient with heart failure, sleep apnea syndrome, and CRF.
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PMID:Death during polysomnography of a patient with cheyne-stokes respiration, respiratory acidosis, and chronic heart failure. 1553 47

Despite recent therapeutic advances, chronic cardiac failure is still associated with a significant morbidity and mortality. Sleep apnoea syndrome is common in this population, affecting almost half of these patients. However, it is rarely diagnosed and treated. There are two types of sleep apnoea syndrome, which can sometimes co-exist: the obstructive apnoea syndrome with collapse of the upper airways, and the central apnoea syndrome with cyclical Cheyne-Stokes respiration, linked with anomalies of central control. Apnoea leads to sympathetic stimulation and an increase in the left ventricular post-charge which can alter cardiac function and the prognosis. Diagnosis of sleep apnoea syndromes is now made with small ambulatory oxymeters which do not disturb sleep and which allow precise detection of episodes of desaturation. Treatment with positive pressure ventilation brings an improvement in daytime symptoms (fatigue, drowsiness) as well as an improvement in cardiac function. Screening for sleep apnoea is thus essential in patients with chronic heart failure, especially in those resistant to optimal drug treatment, in order to improve their management.
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PMID:[Sleep apnoea syndrome and cardiac failure]. 1581 21

Sleep-disordered breathing is very common and is associated with an increased risk of cardiovascular disease, cardiac arrhythmia and stroke. There are two types of sleep apnea: obstructive and central. The objective of this review is to provide a broad perspective of the pathophysiological and clinical aspects of the two types of apnea and to discuss their cardiovascular adverse effects. The diagnosis of sleep apnea syndrome is based on polysomnography, and severity is measured with an apnea-hypopnea index that counts the total number of apneas per hour of sleep. Recent large epidemiologic studies have shown that sleep apnea affects about 16% of men and 5% of women between 30 and 65 years of age. Obstructive sleep apnea is characterized by abnormal collapse of the pharyngeal airway during sleep, snoring, vigorous inspiratory efforts causing frequent arousal, and excessive daytime drowsiness. Central sleep apnea with Cheyne-Stokes respiration is a form of periodic breathing with frequent periods of hyperventilation, and carries a poor prognosis in patients with heart failure. Obstructive apnea can also have substantial health consequences. Although the exact mechanism linking sleep apnea with cardiovascular disease is unknown, there is evidence that obstructive apnea is associated with a group of proinflammatory and prothrombic factors that are also important in the development of atherosclerosis. Nocturnal and daytime sympathetic activity is elevated after sleep apnea. Autonomic abnormalities include an increased resting heart rate, decreased cardiac rhythm activity, and increased blood pressure variability. Obstructive apnea is associated with endothelial dysfunction, increased C-reactive protein and cytokine expression, elevated fibrinogen levels and decreased fibrinolytic activity. Enhanced platelet activity and aggregation, leukocyte adhesion and accumulation of endothelial cells are common in both obstructive apnea and atherosclerosis. Surges in sympathetic activity, blood pressure, ventricular wall tension and afterload adversely affect ventricular function. Many studies have shown that patients with obstructive apnea have an increased incidence of daytime hypertension, and this syndrome is recognized as an independent risk factor for hypertension. Obstructive apnea is associated with myocardial ischemia (silent or symptomatic), acute coronary events, stroke and transient ischemic attacks, cardiac arrhythmia, pulmonary hypertension and heart failure. Central sleep apnea is frequent in severe heart failure. Most heart failure patients with pulmonary congestion chronically hyperventilate because of stimulation of vagal irritant receptors and central and peripheral chemosensitivity. When PaCO2 falls below the threshold required to stimulate breathing, the central drive to respiratory muscles and air inflow ceases and central apnea ensues. Apnea, hypoxia, CO2 retention and arousals provoke elevated sympathetic activity, increased afterload and elevated left ventricular transmural pressure, and promote the progression of heart failure. Tentative relationships have been identified between central apnea and markers of inflammation, oxidative stress and endothelial dysfunction. Recent mid-terms trials showed that nocturnal use of positive airway pressure in patients with the two types of apnea alleviates symptoms, reduces sympathetic activity, improves ventricular function and quality of life, and reduces daytime drowsiness. More studies are needed to understand the mechanisms underlying the relationship between sleep apnea and cardiovascular disease, but clinicians should be aware of this link and should attempt to identify patients with these syndromes.
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PMID:[Sleep apnea syndromes and cardiovascular disease]. 1614 10

Patients with heart failure (HF) often suffer from sleep-related breathing disorders (SRBD) like Cheyne-Stokes respiration (CSR). Cardiac resynchronization therapy (CRT) improves myocardial function and exercise capacity in patients with HF and conduction disturbances. As CRT has been shown to reduce CSR in patients with HF, it is not clear whether CRT improves quality of life and symptomatic depression by improvement of apnea/hypopnea index (AHI) and sleep quality. Forty-two HF patients with conduction disturbance before CRT were screened for CSR and evaluated for sleep quality [Pittsburgh Sleep Quality Index (PSQI)], quality of life score [36-item short form (SF-36)], depression, and exercise capacity (VO2 peak) and ejection fraction (EF). Eighteen patients (three females, age 61+/-10, body mass index 24+/-4 kg m(-2), EF 24+/-4%, QRS complex duration 156+/-32 ms) presented CSR with an AHI of 18+/-8 (11 CSR, 7 mixed). Fourteen patients showed no SRBD (PSQI<5,AHI<5). All patients received CRT and were reevaluated after 18+/-7 weeks. CSR worsen quality of life in seven of eight terms compared to patients without SRBD. Symptomatic depressive symptoms (Beck Depression Inventory>10) were only present in patients with CSR. CRT results in improvement of peak VO2 and EF. There was no difference between patients with CSR and without SRBD on exercise capacity or EF under CRT, whereas CRT led to a significant decrease in AHI (18+/-8 to 3+/-2, p<0.0001), PSQI (18+/-4 to 6+/-3, p=0.0007), with reduction of depression score (12+/-3 to 4.8+/-3, p=0.004). In patients with HF, CSR is associated with symptomatic depressive syndromes and impaired quality of life. CRT reduced CSR with improvement of sleep quality and symptomatic depression.
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PMID:Effect of cardiac resynchronization therapy on sleep quality, quality of life, and symptomatic depression in patients with chronic heart failure and Cheyne-Stokes respiration. 1628 29

Cheyne-Stokes respiration (CSR) is one of several types of unusual breathing with recurrent apneas (dysrhythmias). Reported initially in patients with heart failure or stroke, it was then recognized both in other diseases and as a component of the sleep apnea syndrome. CSR is potentiated and perpetuated by changing states of arousal that occur during sleep. The recurrent hypoxia and surges of sympathetic activity that often occur during the apneas may have serious health consequences. Heart failure and stroke are risk factors for sleep apnea. The recurrent apneas and intermittent hypoxia occurring with sleep apnea further damage the heart and brain. Although all breathing dysrhythmias do not have the same cause, instability in the feedback control involved in the chemical regulation of breathing is the leading cause of CSR. Mathematical models have helped greatly in the understanding of the causes of recurrent apneas.
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PMID:Causes of Cheyne-Stokes respiration. 1637 43

Cheyne-Stokes respiration (CSR) is indicative of adverse outcome in patients with chronic heart failure (CHF). We evaluated the use of brain natriuretic peptide (BNP) plasma levels to predict CSR in CHF patients. In this cross-sectional study, overnight polygraphy and cardiac work-up were performed and neurohumoral activation was determined in 102 consecutive CHF patients (25-82 years). Demographic characteristics did not significantly differ among patients with (n=38) or without CSR (n=64); BNP (median: 377 vs. 142 pg/ml, p<0.001) and norepinephrine levels (459+/-283 vs. 346+/-204 pg/ml, p=0.02) were significantly increased in patients with CSR. BNP concentrations were significantly associated with the central apnoea/hypopnoea index (y=253+/-5.3x; r=0.26, p=0.01). The area under the ROC curve that used BNP to predict CSR was 0.780 (95% CI: 0.688 to 0.873). Using established cut-off limits of BNP plasma levels, heart failure patients with BNP levels >500 pg/ml displayed a 13 fold increased risk of CSR (95% CI: 2.34-73.50; p=0.03) compared to patients with BNP levels <100 pg/ml. In multiple logistic regression analysis p(a)CO2 (point estimate 0.84, 95% CI: 0.72 to 0.98; p=0.02) and higher BNP class (point estimate 3.14, 95% CI: 1.38-7.144; p=0.006) emerged as parameters independently predicting the presence of CSR in our cohort of CHF patients. In conclusion, CSR is associated with neurohumoral activation in CHF patients. Specifically, BNP levels are associated with the severity of cardiac and sleep-related disease, and may be helpful in the diagnosis of CSR and more appropriate use of polysomnography in CHF patients.
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PMID:Brain natriuretic peptide for prediction of Cheyne-Stokes respiration in heart failure patients. 1682 Feb 30

Cheyne-Stokes respiration (CSR) is associated with increased mortality among patients with heart failure. However, the specific link between CSR and mortality remains unclear. One possibility is that CSR results in excitation of the sympathetic nervous system. This review relates evidence that CSR exerts acute effects on the autonomic nervous system during sleep, and thereby influences a number of cardiovascular phenomena, including heart rate, blood pressure, atrioventricular conduction, and ventricular ectopy. In patients in sinus rhythm, heart rate and blood pressure oscillate during CSR in association with respiratory oscillations, such that both peak heart rate and blood pressure occur during the hyperpneic phase. Inhalation of CO2 abolishes both CSR and the associated oscillations in heart rate and blood pressure. In contrast, O2 inhalation sufficient to eliminate hypoxic dips has no significant effect on CSR, heart rate, or blood pressure. In patients with atrial fibrillation, ventricular rate oscillates in association with CSR despite the absence of within-breath respiratory arrhythmia. The comparison of RR intervals between the apneic and hyperpneic phases of CSR indicates that this breathing disorder exerts its effect on ventricular rate by inducing cyclical changes in atrioventricular node conduction properties. In patients with frequent ventricular premature beats (VPBs), VPBs occur more frequently during the hyperpneic phase than the apneic phase of CSR. VPB frequency is also higher during periods of CSR than during periods of regular breathing, with or without correction of hypoxia. In summary, CSR exerts multiple effects on the cardiovascular system that are likely manifestations of respiratory modulation of autonomic activity. It is speculated that the rhythmic oscillations in autonomic tone brought about by CSR may ultimately contribute to the sympatho-excitation and increased mortality long observed in patients with heart failure and CSR.
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PMID:Respiratory modulation of the autonomic nervous system during Cheyne-Stokes respiration. 1684 91


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