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Ivity in patients with neuromuscular disease. buy viagra online Strictly speaking, these events are manifestations of central hypoventilation related to decreased respiratory muscle activity rather than posthyperventilation hypocapnia; hence, these events are more relevant to hypercapnic rather than nonhypercapnic central apnea. Epidemiology of central sleep apnea the precise prevalence of central apnea is not known. generic viagra canada In one epidemiologic study investigating the prevalence of central sleep apnea in the general population, the overall prevalence of central apnea (central apnea index >0) in women was only 0. 3%, compared with 7. 8% in men. viagra coupon 10,11 the prevalence of central apnea is influenced by several factors, including age, sex, the presence of heart failure, and certain metabolic disorders. However, in some patients, no specific underlying condition can be uncovered; central apnea in these patients is thus deemed idiopathic. cost of viagra 20 mg Interestingly, patients with idiopathic central sleep apnea have a higher prevalence of atrial fibrillation than patients free of sleep apnea and those with obstructive sleep apnea. 12 age and sex several studies suggest that sleep apnea is more common in older adults. viagra samples Whether this is a true age effect or is attributable to comorbid conditions is unclear. One plausible postulation is that sleep-state instability in older adults leads to recurrent central apnea and breathing instability. buy viagra overnight shipping Community-based epidemiologic studies have demonstrated a paucity of central apnea in premenopausal women. viagra 20mg price 10,11 likewise, male sex is a risk factor for the development of central sleep apnea in patients with congestive heart failure (chf). buy generic viagra online 13 we have shown that the hypocapnic apneic threshold is lower in women relative to men. viagra for bph treatment 14,15 in other words, women are less susceptible to hypocapnic disfacilitation and the ensuing reduction of ventilatory drive. There was no difference in the apneic threshold during the luteal phase vs the follicular phase of the menstrual cycle. can viagra pills cut half Thus, it is unlikely that progester. generic viagra without prescription