Arch Intern Med
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Randomized Controlled Trial
A double-blind, placebo-controlled, crossover study of sildenafil in obstructive sleep apnea.
Sildenafil prolongs the action of cyclic guanosine monophosphate and nitric oxide by inhibiting cyclic guanosine monophosphate-specific phosphodiesterase 5. It is largely used for erectile dysfunction, a highly prevalent condition in obstructive sleep apnea. Because nitric oxide promotes upper airway congestion, muscle relaxation, and pulmonary vasodilation, the aim of this study was to establish the impact of a single 50-mg dose of sildenafil on the sleep of patients with severe obstructive sleep apnea. ⋯ In patients with severe obstructive sleep apnea, a single 50-mg dose of sildenafil at bedtime worsens respiratory and desaturation events.
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Comparative Study
Sleepiness and sleep in patients with both systolic heart failure and obstructive sleep apnea.
Adverse effects of obstructive sleep apnea (OSA), including sleep deprivation, can contribute to the progression of heart failure. The usual indication to diagnose and treat sleep apnea is subjective sleepiness. Previous studies suggest that patients with both heart failure and obstructive sleep apnea often do not complain of sleepiness, albeit their sleep time may be reduced. Therefore, we tested the hypothesis that patients with heart failure have less sleepiness and sleep less compared with subjects without heart failure for a given severity of OSA. ⋯ Patients with heart failure have less subjective daytime sleepiness compared with individuals from a community sample, despite significantly reduced sleep time, whether or not they have OSA. In patients with heart failure, the absence of subjective sleepiness is not a reliable means of ruling out OSA.
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Chronic illness may not only directly impact the sleep of a patient but also indirectly impact the sleep of the family members who provide nighttime care. For parents of children with chronic illnesses, few studies have examined sleep disruptions that may account for elevated rates of depression and fatigue. Our objectives were to examine sleep patterns and causes of sleep disturbances in caregivers of children with and without chronic illnesses and to determine whether sleep mediates the relationship between a child's chronic illness and daytime functioning in caregivers. ⋯ Sleep in caregivers of children with chronic illnesses, in particular ventilator dependency, is significantly disrupted, resulting in chronic partial sleep deprivation. Owing to the level of attention and care required by these children, interventions and support for caregivers to improve their sleep quality and quantity are necessary.
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Evidence from laboratory and epidemiologic studies suggests that decreased sleep duration or quality may increase diabetes risk. We examined whether short or poor sleep is associated with glycemic control in African Americans with type 2 diabetes mellitus. ⋯ In our sample, sleep duration and quality were significant predictors of HbA1c, a key marker of glycemic control. Combined with existing evidence linking sleep loss to increased diabetes risk, these data suggest that optimizing sleep duration and quality should be tested as an intervention to improve glucose control in patients with type 2 diabetes.