Mathieu Lemay

STABILITY OF ESTIMATION AND ABILITY TO TRACK BLOOD PRESSURE CHANGES IN HYPERTENSION MANAGEMENT USING A CUFFLESS WEARABLE DEVICE (BPLONG STUDY)

Pierre-Antonin Rigon, Martin Proenca, Guillaume Bonnier, Damien Ferrario et autres

Objective: Blood pressure (BP) monitoring is undergoing a paradigm shift with the rapid growth of cuffless tech-nologies. Scientific societies have emphasized that these technologies must reliably track short- and long-term BP changes to support clinical decision-making. This study investigates the stability of …

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Unobtrusive Reflectance Photoplethysmography for Detecting and Severity Grading of Sleep Apnea via Oxygen Desaturation Index

Clémentine Aguet, Patrick Theurillat, Florent Baty, Maximilian Boesch et autres

Abstract Sleep apnea is a common chronic sleep-related disorder which is known to be a comorbidity for cerebroand cardio-vascular disease. Diagnosis of sleep apnea usually requires an overnight polysomnography at the sleep laboratory. In this paper, we used a wearable device which …

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Towards long-term sleep staging via wearable reflective photoplethysmography

Loris Constantin, Christian Horváth, Florent Baty, Clémentine Aguet et autres

STUDY OBJECTIVES: Sleep staging is usually performed by manual scoring of polysomnography (PSG), which is expensive, laborious, and poorly scalable. We propose an alternative to PSG for ambulatory sleep staging using wearable photoplethysmography (PPG) recorded by a smartwatch and automated scoring. METHODS: …

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Continuous non-invasive measurement of core vital signs in the hospital ward

Guillaume Bonnier, K Adám, Yara-Maria Proust, P. Renevey et autres

Vital sign monitoring in the hospital ward is critical to provide valuable information to predict patient deterioration or treatment efficiency. The frequency at which patients' vitals should be assessed is a compromise between insufficient monitoring and work overload.This project, in collaboration with …

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Continuous SpO 2 Monitoring Using Reflectance Pulse Oximetry at the Wrist and Upper Arm During Overnight Sleep Apnea Recordings

Clémentine Aguet, Patrick Theurillat, Florent Baty, Maximilian Boesch et autres

Sleep apnea (SA) is a chronic sleep-related disorder consisting of repetitive pauses or restrictions in airflow during sleep and is known to be a risk factor for cerebro- and cardiovascular disease. It is generally diagnosed using polysomnography (PSG) recorded overnight in an …

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Sleep Staging for Wearable Electroencephalography Leveraging Machine Learning and Conventional Polysomnography Datasets *

Gürkan Yılmaz, Cristina Sainz Martinez, Fabian Braun, Oriella Gnarra et autres

Wearable electroencephalography (EEG) sensors are becoming increasingly accessible, enabling long-term, at-home automatic sleep profiling, with outstanding potential for personalized medicine and wellness applications. However, current devices remain less reliable for sleep stage classification than gold-standard, lab-based polysomnography (PSG). One of the main …

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Clinical Evaluation of PPG-Based Deep Learning Models for Sleep Staging in Patients with Suspected Sleep Apnea

Clémentine Aguet, Loris Constantin, Florent Baty, Maximilian Boesch et autres

Traditionally used for measuring heart rate and oxygen saturation, photoplethysmography (PPG) has emerged as a promising non-invasive alternative for diagnosing sleep related disorders. Unlike the gold-standard polysomnography (PSG) performed in-lab at the hospital, PPG offers a more scalable and cost-effective solution. Recent …

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Remote monitoring of patients with obstructive sleep apnea syndrome treated with CPAP: a feasibility study

Amélie Hediger-Parolini, Florian Charbonnier, Stéphane Grandin, Hiromitsu Takahashi et autres

Introduction: Obstructive sleep apnea syndrome (OSAS) is a prevalent sleep disorder associated with significant morbidity and mortality, particularly due to its links with cardiovascular diseases like hypertension (HT). Continuous positive airway pressure (CPAP) remains the standard treatment for OSAS, yet individualized therapy …

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Continuous SpO2 Monitoring Using Reflectance Pulse Oximetry at the Wrist and Upper Arm During Overnight Sleep Apnea Recordings

Clémentine Aguet, Patrick Theurillat, Florent Baty, Maximilian Boesch et autres

Sleep apnea (SA) is a chronic sleep-related disorder consisting of repetitive pauses or restrictions in airflow during sleep and is known to be a risk factor for cerebro- and cardiovascular disease. It is generally diagnosed using polysomnography (PSG) recorded overnight in an …

Changes in sensor recorded activity patterns and neuropsychiatric symptoms after deep brain stimulation for Parkinson’s disease: 5 case reports

Lena C. Bruhin, Michael Single, Aileen C. Naef, Katrin Petermann et autres

BACKGROUND: Effects of subthalamic nucleus deep brain stimulation (STN-DBS) on neuropsychiatric symptoms of Parkinson's disease (PD) remain debated. Sensor technology might help to objectively assess behavioural changes after STN-DBS. CASE PRESENTATION: 5 PD patients were assessed 1 before and 5 months after …

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An optimized framework for simultaneous EEG-fMRI at 7T enabling safe, high-quality human brain imaging with millisecond temporal resolution and sub-millimeter spatial resolution

Cristina Sainz Martinez, Jonathan Wirsich, Cilia Jäger, Tracy Warbrick et autres

The combination of electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) at ultra-high field (7 Tesla) offers appealing new possibilities to probe human brain function non-invasively with high coverage, millisecond temporal precision and sub-millimeter spatial precision, unraveling cortical layers and small subcortical …

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Simultaneous EEG-fMRI at 7T with adapted EEG leads and reference sensors for high-quality, high-resolution imaging: human evaluation

Cristina Sainz Martinez, Jonathan Wirsich, Serge Vulliémoz, Mathieu Lemay et autres

Motivation: The combination of BOLD-fMRI at 7T with EEG could bring novel insights to neuroscience. However, the combination has remained challenging due to accentuated artifacts and RF-coil constraints. Goal(s): To implement a first-of-its-kind 7T EEG-fMRI framework combining key developments from recent studies, …