ABSTRACT
STUDY OBJECTIVES: Reliable sleep staging is difficult to obtain from home sleep testing for diagnosis of obstructive sleep apnea (OSA), especially when it is self-applied. Hence, the current study aimed to develop a single frontal electroencephalography-based automatic sleep staging system (ASSS). METHODS: The ASSS system was developed on a clinical dataset, with a high percentage of participants with OSA. The F4-M1 signal extracted from 62 participants (62.9% having OSA) was used to build a four-stage classifier. Performance of the ASSS was tested in a holdout set of 58 patients (60.3% having OSA) with epoch-by-epoch and whole-night agreement for sleep staging compared with expert scoring of polysomnography. RESULTS: Mean all-stage percentage agreement was 75.52% (95% confidence interval, 72.90 to 78.13) (kappa 0.62; 95% confidence interval, 0.58 to 0.65), with mean percentage agreement for wake, light sleep, deep sleep (DS), and rapid eye movement of 78.04%, 70.97%, 83.65%, and 75.00%, respectively. The whole-night agreement was good-excellent (intraclass correlation coefficient, 0.74 to 0.88) for sleep onset latency, wake after sleep onset, total sleep time, and sleep efficiency. Compared to the non-OSA subset, the OSA subset had lower agreement for DS. CONCLUSIONS: Our results indicate that a single-channel F4-M1 based ASSS was sufficient for sleep staging in a population with a high percentage of participants with OSA.
Subject(s)
Electroencephalography/methods , Sleep Apnea, Obstructive/diagnosis , Sleep Apnea, Obstructive/physiopathology , Sleep Stages/physiology , Female , Humans , Male , Middle Aged , Polysomnography , Reproducibility of Results , TaiwanSubject(s)
Chest Pain/etiology , Dyspnea/etiology , Pneumorrhachis/diagnostic imaging , Pneumothorax/diagnostic imaging , Adolescent , Chest Pain/diagnostic imaging , Conservative Treatment , Diagnosis, Differential , Dyspnea/diagnostic imaging , Humans , Male , Mediastinal Emphysema/diagnostic imaging , Radiography, Thoracic , Tomography, X-Ray ComputedABSTRACT
[This corrects the article DOI: 10.1371/journal.pone.0187032.].
ABSTRACT
INTRODUCTION: This study aimed to determine the effect of combining positive airway pressure (PAP) therapy and mandibular advancement device (MAD) in patients with severe obstructive sleep apnea (OSA) who were pressure intolerant for PAP and were unresponsive to MAD. METHODS: This retrospective study reviewed the medical records of severe OSA patients with apnea-hypopnea index (AHI) ≥ 30/hr who were diagnosed between October 1, 2008 and June 30, 2014. Patients were initially treated with 2 weeks of PAP, and those who were intolerant to high-pressure PAP (≥15 cm H2O) were switched to 12 weeks of MAD, which is a monobloc designed at 75% of maximum protrusion. Patients who had high residual AHI (≥15/hr) on MAD underwent 12 weeks of combination therapy (CT) with MAD and CPAP and were enrolled in the present study. Enrolled subjects who completed the 12-week CT were followed-up until June 30, 2016. RESULTS: A total of 14 male patients were included. All three treatments effectively reduced AHI, oxygen desaturation index (ODI), and total sleep time with SpO2 <90% (% TST-SpO2<90%) compared to pretreatment values. The residual AHI and ODI on CT was lower than that on MAD or PAP. The residual % TST-SpO2<90% was lower than that on MAD and similar to that on PAP. The therapeutic pressure on CT was on average 9.2 cm H2O lower than that on PAP. For the 11 patients who completed CT, only CT reduced ESS compared to pretreatment value. No treatment had significant impact on % slow wave sleep or overnight change of blood pressure. For patients who completed CT, the average usage was 5.9±1.7 hr/night at 12th week and 6.4±1.5 hr/night at a median follow-up of 36.5-months. CONCLUSIONS: Combining MAD and CPAP showed additive effects on reducing AHI and ODI, and lowered the therapeutic pressures.
Subject(s)
Continuous Positive Airway Pressure , Mandibular Advancement/instrumentation , Sleep Apnea, Obstructive/therapy , Blood Pressure , Combined Modality Therapy , Female , Follow-Up Studies , Humans , Male , Middle Aged , Patient Compliance , Retrospective Studies , Sleep Apnea, Obstructive/diagnostic imaging , Sleep Apnea, Obstructive/physiopathology , Tomography, X-Ray Computed , Treatment FailureABSTRACT
BACKGROUND: Acute respiratory distress syndrome (ARDS) carries significant morbidity and mortality. No previous studies have investigated the long-term outcomes of ARDS patients in Taiwan. OBJECTIVE: This study aimed to investigate the survival of ARDS patients after discharge from the hospital in Taiwan. METHODS: Medical records from 150 ARDS patients discharged alive from the intensive care unit from January 2004 to June 2009 were reviewed. Survival of these patients was followed for 5 years, and prognostic factors were identified. RESULTS: Cumulative survival rates were 81.4% at 6 months, 79.0% at 1 year, 67.2% at 2 years, and 45.7% at 5 years. Independent prognostic factors influencing both 1- and 5-year survival rates were age, previous lung disease, and disposition after discharge. For 5-year survival, renal disease was also an independent risk factor. DISCUSSION: The mortality rate of ARDS survivors after intensive care unit discharge is still high in Taiwan. Three independent risk factors were found to affect the overall survival of these patients.
