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Polysomnography

About: Polysomnography is a research topic. Over the lifetime, 19527 publications have been published within this topic receiving 858718 citations. The topic is also known as: PSG & polysomnogram.


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Journal ArticleDOI
TL;DR: Monitoring this posterior 'hot zone' in real time predicted whether an individual reported dreaming or the absence of dream experiences during NREM sleep, suggesting that it may constitute a core correlate of conscious experiences in sleep.
Abstract: Consciousness never fades during waking. However, when awakened from sleep, we sometimes recall dreams and sometimes recall no experiences. Traditionally, dreaming has been identified with rapid eye-movement (REM) sleep, characterized by wake-like, globally 'activated', high-frequency electroencephalographic activity. However, dreaming also occurs in non-REM (NREM) sleep, characterized by prominent low-frequency activity. This challenges our understanding of the neural correlates of conscious experiences in sleep. Using high-density electroencephalography, we contrasted the presence and absence of dreaming in NREM and REM sleep. In both NREM and REM sleep, reports of dream experience were associated with local decreases in low-frequency activity in posterior cortical regions. High-frequency activity in these regions correlated with specific dream contents. Monitoring this posterior 'hot zone' in real time predicted whether an individual reported dreaming or the absence of dream experiences during NREM sleep, suggesting that it may constitute a core correlate of conscious experiences in sleep.

388 citations

Journal ArticleDOI
TL;DR: A meta-analytic review of polysomnographic studies comparing sleep in people with and without PTSD suggested that sleep abnormalities exist in PTSD, and that some of the inconsistencies in prior findings may be explained by moderating variables.
Abstract: Although sleep complaints are common among patients with Posttraumatic stress disorder (PTSD), polysomnographic studies examining sleep abnormalities in PTSD have produced inconsistent results. To clarify discrepant findings, we conducted a meta-analytic review of 20 polysomnographic studies comparing sleep in people with and without PTSD. Results showed that PTSD patients had more stage 1 sleep, less slow wave sleep, and greater rapid-eye-movement density compared to people without PTSD. We also conducted exploratory analyses aimed at examining potential moderating variables (age, sex, and comorbid depression and substance use disorders). Overall, studies with a greater proportion of male participants or a low rate of comorbid depression tended to find more PTSD-related sleep disturbances. These findings suggest that sleep abnormalities exist in PTSD, and that some of the inconsistencies in prior findings may be explained by moderating variables.

387 citations

Journal ArticleDOI
TL;DR: It is concluded that hypocapnia is an important determinant of CSR-CSA in CHF and circulatory delay plays an important role in determining CSR -CSA cycle length.
Abstract: Periodic breathing with central apneas during sleep is typically triggered by hypocapnia resulting from hyperventilation. We therefore hypothesized that hypocapnia would be an important determinant of Cheyne-Stokes respiration with central sleep apnea (CSR-CSA) in patients with congestive heart failure (CHF). To test this hypothesis, 24 male patients with CHF underwent overnight polysomnography during which transcutaneous PCO2 (PtcCO2) was measured. Lung to ear circulation time (LECT), derived from an ear oximeter as an estimate of circulatory delay, and CSR-CSA cycle length were determined. Patients were divided into a CSR-CSA group (n = 12, mean ± SEM of 49.2 ± 6.3 central apneas and hypopneas per h sleep) and a control group without CSR-CSA (n = 12, 4.9 ± 0.8 central apneas and hypopneas per h sleep). There were no significant differences in left ventricular ejection fraction, awake PaO2, mean nocturnal SaO2, or LECT between the two groups. In contrast, the awake PaCO2 and mean sleep PtcCO2 were signif...

387 citations

Journal ArticleDOI
TL;DR: This study suggests that baseline SDB is associated with increased cancer mortality in a community-based sample and future studies that replicate the findings and look at the association between sleep apnea and survival after cancer diagnosis are needed.
Abstract: Rationale: Sleep-disordered breathing (SDB) has been associated with total and cardiovascular mortality, but an association with cancer mortality has not been studied. Results from in vitro and animal studies suggest that intermittent hypoxia promotes cancer tumor growth.Objectives: The goal of the present study was to examine whether SDB is associated with cancer mortality in a community-based sample.Methods: We used 22-year mortality follow-up data from the Wisconsin Sleep Cohort sample (n = 1,522). SDB was assessed at baseline with full polysomnography. SDB was categorized using the apnea-hypopnea index (AHI) and the hypoxemia index (percent sleep time below 90% oxyhemoglobin saturation). The hazards of cancer mortality across levels of SDB severity were compared using crude and multivariate analyses.Measurements and Main Results: Adjusting for age, sex, body mass index, and smoking, SDB was associated with total and cancer mortality in a dose–response fashion. Compared with normal subjects, the adjust...

387 citations

Journal ArticleDOI
01 Feb 1996-Stroke
TL;DR: SDB accompanied by arterial oxyhemoglobin desaturation is common in patients undergoing rehabilitation after stroke and is associated with higher mortality at 1 year and lower BI scores at discharge and at 3 and 12 months after stroke.
Abstract: Background and Purpose We objectively evaluated patients with recent stroke to determine the prevalence of sleep-disordered breathing (SDB) and whether SDB was associated with unfavorable clinical outcomes. Methods Forty-seven patients with recent ischemic stroke (median, 13 days) were studied with computerized overnight oximetry for evidence of arterial oxyhemoglobin desaturation (Sao2). Polysomnography was also performed on 19 patients. Medical history, sleep history, location of stroke, and severity of neurological deficit were recorded, and patients were observed by staff for evidence of snoring and excessive daytime sleepiness. Functional abilities were measured with the use of the Barthel Index (BI). Outcome variables included ability to return home at discharge, continued residence at home at 3 and 12 months, BI at discharge, BI at 3 and 12 months, and death from any cause at 12 months. Results Mean Sao2 during oximetry was 94.0±1.7%, and percentage of recording time spent at <90% Sao2 was 4.3±5.7%...

386 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20231,010
20221,884
20211,102
20201,023
20191,026