20 results match your criteria underestimation ahi

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Comparing respiratory polygraphy with pulse transit time analysis versus overnight polysomnography in the diagnosis of obstructive sleep apnoea in children.

Sleep Med 2021 May 1;81:457-462. Epub 2021 Mar 1.

FHKAM(Otolaryngology), Department of Otolaryngology, Tuen Mun Hospital, Hong Kong.

Objective: Obstructive sleep apnea syndrome in children is associated with significant morbidity. Polysomnography is the main diagnostic tool but is time consuming and requires skilled manpower to supervise the patient overnight and hence long referral to diagnosis time. However, there are limitations and underestimation of the apnoea hyponea index (AHI) with alternative home sleep apnoea testing (HSAT), such as type 3 respiratory polygraphy (RP). Read More

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The challenges in scoring hypopneas in children: is pulse wave amplitude drop the answer?

Sleep Med 2021 May 1;81:336-340. Epub 2021 Mar 1.

Division of Pulmonary and Sleep Medicine, Department of Pediatrics, Children's Mercy Hospital, Kansas City, MO, USA; University of Missouri-Kansas City School of Medicine, Kansas City, MO, USA.

Background: Identifying electroencephalogram (EEG) cortical arousals are crucial in scoring hypopneas and respiratory efforts related arousals (RERAs) during a polysomnogram. As children have high arousal threshold, many of the flow limited breaths or hypopneas may not be associated with visual EEG arousals, hence this may lead to potential underestimation of the degree of sleep disordered breathing. Pulse wave amplitude (PWA) is a signal obtained from finger photoplethysmography which correlates directly to finger blood flow. Read More

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Comparison of hourly aerosol retrievals from JAXA Himawari/AHI in version 3.0 and a simple customized method.

Sci Rep 2020 11 30;10(1):20884. Epub 2020 Nov 30.

School of Geoscience and Info-Physics, Central South University, Changsha, China.

Advanced Himawari imager (AHI) carried on the new-generation geostationary meteorological Himawari-8 satellite of Japan has been generating aerosol observations with a high temporal resolution since 7 July 2015. However, the previous studies lack a comprehensive quality assessment and spatial coverage analysis of AHI hourly aerosol products (level 3 version 3.0) across the full disk scan. Read More

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November 2020

Comparison of Diagnostic Sleep Studies in Hospitalized Neurorehabilitation Patients With Moderate to Severe Traumatic Brain Injury.

Chest 2020 10 6;158(4):1689-1700. Epub 2020 May 6.

Division of Pulmonary, Critical Care, and Sleep Medicine and Neuroscience Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH.

Background: OSA is prevalent during a time of critical neural repair after traumatic brain injury (TBI). The diagnostic utility of existing sleep studies is needed to inform clinical management during acute recovery from TBI.

Research Question: This study aimed to evaluate the non-inferiority and diagnostic accuracy of a portable level 3 sleep study relative to level 1 polysomnography in hospitalized neurorehabilitation patients with TBI. Read More

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October 2020

[Multifunctional Monitoring: is it Possible to Simultaneously Evaluate Blood Pressure and Sleep-Disordered Breathing?]

Kardiologiia 2020 Feb 4;60(1):10-15. Epub 2020 Feb 4.

Institute of Cardiological Equipment (Incart).

Objective Carry out a comparative assessment of respiratory performance, based on multifunctional monitoring (MFM) and the recommended practice for complete polysomnography (PSG), and evaluate the effect of the blood pressure (BP) measurements in MFM on the quality of sleep.Materials and Methods At the first stage, 22 healthy volunteers (control group) underwent concomitant PSG and MFM, and 14 patients with suspected sleep-disordered breathing (SDB) underwent only PSG. At the second stage, concomitant PSG and MFM were performed in patients with confirmed SDB. Read More

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February 2020

Evaluation and uncertainty estimate of next-generation geostationary meteorological Himawari-8/AHI aerosol products.

Sci Total Environ 2019 Nov 20;692:879-891. Epub 2019 Jul 20.

State Key Laboratory of Remote Sensing Science, College of Global Change and Earth System Science, Beijing Normal University, Beijing, China.

The next-generation geostationary meteorological Himawari-8 satellite carrying the Advanced Himawari Imager (AHI) allows frequent observations of the atmosphere, the surface, and oceans every 10 min. With its retrieval algorithms recently updated, Himawari-8/AHI Version 2 Level 2 aerosol products are now available. However, these retrievals have not yet undergone a quality assessment. Read More

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November 2019

Screening obstructive sleep apnea-hypopnea syndrome in hypertensive patients: a comparative study of the efficiency of the Epworth sleepiness scale.

BMC Pulm Med 2018 Nov 21;18(1):173. Epub 2018 Nov 21.

Department of Therapeutics and Hypertension, TSA 50032, Rangueil UniversityHospital, 31059 cedex 9, Toulouse, France.

Background: Untreated Obstructive Sleep Apnea Hypnopnea Syndrome (OSAHS) is a known factor contributing to resistant hypertension (HT). Continuous Positive Airways Pressure (CPAP) is effective to decrease blood pressure (BP) in severe OSAHS. In our clinical practice, hypertensive patients seem less symptomatic with regard to severe OSAHS than normotensive patients, leading to a risk of underdiagnosis when OSAHS is screened with Epworth Sleepiness Scale (ESS). Read More

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November 2018

Diurnal cycle and seasonal variation of cloud cover over the Tibetan Plateau as determined from Himawari-8 new-generation geostationary satellite data.

Sci Rep 2018 01 18;8(1):1105. Epub 2018 Jan 18.

State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China.

Analysis of cloud cover and its diurnal variation over the Tibetan Plateau (TP) is highly reliant on satellite data; however, the accuracy of cloud detection from both polar-orbiting and geostationary satellites over this area remains unclear. The new-generation geostationary Himawari-8 satellites provide high-resolution spatial and temporal information about clouds over the Tibetan Plateau. In this study, the cloud detection of MODIS and AHI is investigated and validated against CALIPSO measurements. Read More

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January 2018

Obstructive sleep apnoea of mild severity: should it be treated?

Curr Opin Pulm Med 2017 11;23(6):506-511

aDepartment of Respiratory and Sleep Medicine, St. Vincent's University Hospital, School of Medicine, University College Dublin, Dublin, Ireland bGuangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China.

Purpose Of Review: To provide guidance in the management of mild obstructive sleep apnoea syndrome (OSAS) in the context of a very high prevalence, poor correlation with symptom profile, and lack of evidence that mild OSAS significantly contributes to comorbidity or early mortality.

Recent Findings: Mild obstructive sleep apnoea defined by hourly frequency of apnoeas or hypopnoeas (AHI) between 5 and 15 affects up to 35% of the general adult population but is much less prevalent when associated daytime symptoms are included. The poor correlation between symptoms and AHI complicates diagnosis and reports that mild OSAS is not significantly associated with comorbidity casts doubt on clinical significance. Read More

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November 2017

Potential Underestimation of Sleep Apnea Severity by At-Home Kits: Rescoring In-Laboratory Polysomnography Without Sleep Staging.

J Clin Sleep Med 2017 Apr 15;13(4):551-555. Epub 2017 Apr 15.

Neurology Department, Massachusetts General Hospital, Boston, MA.

Study Objectives: Home sleep apnea testing (HSAT) is increasingly available for diagnosing obstructive sleep apnea (OSA). One key limitation of most HSAT involves the lack of sleep staging, such that the respiratory event index is calculated using the total recording time (TRT) rather than total sleep time (TST).

Methods: We performed a retrospective analysis of n = 838 diagnostic polysomnography (PSG) nights from our center; n = 444 with OSA (4% rule, apneahypopnea index (AHI) ≥ 5), and n = 394 with AHI < 5. Read More

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Polysomnography using abbreviated signal montages: impact on sleep and cortical arousal scoring.

Sleep Med 2015 Jan 26;16(1):173-80. Epub 2014 Nov 26.

Institute for Breathing and Sleep, Austin Health, Heidelberg, Vic., Australia.

Objective: This study examined the impact of using two abbreviated signal montages on the accuracy, precision and inter-scorer reliability of polysomnography (PSG) sleep and arousal scoring, compared to a standard reference montage, in a cohort of patients investigated for obstructive sleep apnoea (OSA). One abbreviated montage incorporated two signals dedicated to sleep and arousal scoring, and the other incorporated a single signal.

Methods: Four scorers from two laboratories each scored 15 PSGS four times in random order: once using each abbreviated montage and twice using the reference montage. Read More

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January 2015

Overnight polysomnography versus respiratory polygraphy in the diagnosis of pediatric obstructive sleep apnea.

Sleep 2014 Feb 1;37(2):255-60. Epub 2014 Feb 1.

Section of Pediatric Sleep Medicine, Department of Pediatrics, Pritzker School of Medicine, Biological Sciences Division, The University of Chicago, Chicago, IL.

Background: Substantial discrepancies exist in the type of sleep studies performed to diagnose pediatric obstructive sleep apnea (OSA) in different countries. Respiratory polygraphic (RP) recordings are primarily performed in sleep laboratories in Europe, whereas polysomnography (PSG) constitutes the majority in the US and Australia. Home RP show consistent apnea-hypopnea index (AHI) underscoring, primarily because the total recording time is used as the denominator when calculating the AHI compared to total sleep time (TST). Read More

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February 2014

Usefulness of extended holter ECG monitoring for serious arrhythmia detection in patients with heart failure and sleep apnea.

Ann Noninvasive Electrocardiol 2013 Mar 22;18(2):163-9. Epub 2012 Nov 22.

Chair and Clinic of Cardiology, Medical University of Łódź, Łódź, 91-347 Poland.

Background: In patients with systolic heart failure (HF), coexisting sleep apnea may promote arrhythmia. Ambulatory Holter electrocardiogram (ECG) monitoring (AECG) is a method of arrhythmia and apnea evaluation. We hypothesized that 24-hour AECG in patients with HF who have a high risk of serious arrhythmia may be less accurate than AECG extended to 48 hours and that, moreover, arrhythmia may be related to apnea. Read More

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The impact of body posture and sleep stages on sleep apnea severity in adults.

J Clin Sleep Med 2012 Dec 15;8(6):655-66A. Epub 2012 Dec 15.

Neurology Department, Massachusetts General Hospital, Boston, MA 02114, USA.

Study Objectives: Determining the presence and severity of obstructive sleep apnea (OSA) is based on apnea and hypopnea event rates per hour of sleep. Making this determination presents a diagnostic challenge, given that summary metrics do not consider certain factors that influence severity, such as body position and the composition of sleep stages.

Methods: We retrospectively analyzed 300 consecutive diagnostic PSGs performed at our center to determine the impact of body position and sleep stage on sleep apnea severity. Read More

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December 2012

Pulse transit time in screening sleep disordered breathing in an elderly population: the PROOF-SYNAPSE study.

Sleep 2011 Aug 1;34(8):1051-9. Epub 2011 Aug 1.

INSERM, U1028, CNRS, UMR5292, Centre de Recherche en Neurosciences de Lyon, Intégration centrale de la douleur chez l’Homme, Université Claude Bernard, Lyon, F-69000, France.

Study Objectives: Pulse transit time (PPT) has been introduced as a useful screening tool to diagnose sleep disordered breathing (SDB). Since the prevalence of SDB increases with age, the question is whether PTT could be used to diagnose SDB in the elderly. We assess the effectiveness of PTT for SDB screening in a large healthy elderly population. Read More

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The sleep/wake state scoring from mandible movement signal.

Sleep Breath 2012 Jun 11;16(2):535-42. Epub 2011 Jun 11.

Electronic Department, Montefiore Institute, University of Liège (ULg), Building B28, Grande Traverse, Sart-Tilman, B4000, Liège, Belgium.

Purpose: Estimating the total sleep time in home recording devices is necessary to avoid underestimation of the indices reflecting sleep apnea and hypopnea syndrome severity, e.g., the apnea-hypopnea index (AHI). Read More

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A portable automated assessment tool for sleep apnea using a combined Holter-oximeter.

Sleep 2008 Oct;31(10):1432-9

School of Electrical, Electronic and Mechanical Engineering, University College Dublin, Dublin, Ireland.

Study Objectives: Resource limitations have raised interest in portable monitoring systems that can be used by specialist sleep physicians as part of an overall strategy to improve access to the diagnosis of sleep apnea. This study validates a combined electrocardiogram and oximetry recorder (Holter-oximeter) against simultaneous polysomnography for detection of sleep apnea.

Design: Prospective study. Read More

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October 2008

Prediction of obstructive sleep apnea by OxiFlow in overweight patients.

Sleep Med 2002 Sep;3(5):417-22

Centre Médical de Forcilles, F-77170 Férolles-Attilly, France.

Objectives: The aim of our study was to assess the diagnostic characteristics of the OxiFlow (OF) device that combines oximetry with recording of thermistor airflow.

Methods: In patients referred to the sleep laboratory of an obesity clinic apnea-hypopnea index (AHI, events h(-1)) was calculated both by a full-night polysomnography (PSG) and OF on a separate night. Fifty-six patients were studied, of whom 49 had OSA defined as an AHI> or =15 events h(-1). Read More

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September 2002

[Validating a 7-channel ambulatory polygraph unit. 2: Simultaneous polysomnography].

HNO 1999 Apr;47(4):256-61

Sektion für Rhinologie und Rhonchopathien, Universitäts-HNO-Klinik Ulm.

Purpose: For some time, the ambulatory diagnosis of respiratory disturbances during sleep has included the use of seven-channel recording units. One of these systems is the POLY-MESAM unit (MAP, Germany).

Methods: The aim of the present study was to validate the POLY-MESAM system by simultaneously performing 12-channel polysomnography. Read More

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Auto CPAP in the treatment of sleep apnea hypopnea syndrome.

F Sériès

Sleep 1996 Dec;19(10 Suppl):S281-3

Unité de recherche, Centre de Pneumologie de l'Hôpital Laval, Université Laval, Québec, Canada.

Auto CPAP machines represent the most recent development in the field of CPAP therapy. We compared the efficiency of one of these machines (Morphée Plus, Pierre Medical, France) to conventional CPAP treatment in untreated SAHS. With this apparatus, the positive pressure level automatically varies within pressure bounds on each side of a reference pressure, these pressure characteristics being defined by the user. Read More

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December 1996
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