User profiles for "author:Walter Karlen"
Walter KarlenMobile Health & AI Systems for Medicine Verified email at ieee.org Cited by 4026 |
Capillary refill time: is it still a useful clinical sign?
A Pickard, W Karlen, JM Ansermino - Anesthesia & Analgesia, 2011 - journals.lww.com
Capillary refill time (CRT) is widely used by health care workers as part of the rapid,
structured cardiopulmonary assessment of critically ill patients. Measurement involves the …
structured cardiopulmonary assessment of critically ill patients. Measurement involves the …
[HTML][HTML] Ethics review of big data research: What should stay and what should be reformed?
Background Ethics review is the process of assessing the ethics of research involving
humans. The Ethics Review Committee (ERC) is the key oversight mechanism designated to …
humans. The Ethics Review Committee (ERC) is the key oversight mechanism designated to …
Remote health diagnosis and monitoring in the time of COVID-19
Abstract Coronavirus disease (COVID-19), caused by the severe acute respiratory syndrome
coronavirus 2 (SARS-CoV-2), is rapidly spreading across the globe. The clinical spectrum of …
coronavirus 2 (SARS-CoV-2), is rapidly spreading across the globe. The clinical spectrum of …
Multiparameter respiratory rate estimation from the photoplethysmogram
We present a novel method for estimating respiratory rate in real time from the
photoplethysmogram (PPG) obtained from pulse oximetry. Three respiratory-induced …
photoplethysmogram (PPG) obtained from pulse oximetry. Three respiratory-induced …
Cxplain: Causal explanations for model interpretation under uncertainty
Feature importance estimates that inform users about the degree to which given inputs
influence the output of a predictive model are crucial for understanding, validating, and …
influence the output of a predictive model are crucial for understanding, validating, and …
Sleep and wake classification with ECG and respiratory effort signals
W Karlen, C Mattiussi… - IEEE Transactions on …, 2009 - ieeexplore.ieee.org
We describe a method for the online classification of sleep/wake states based on
cardiorespiratory signals produced by wearable sensors. The method was conceived in …
cardiorespiratory signals produced by wearable sensors. The method was conceived in …
Photoplethysmogram signal quality estimation using repeated Gaussian filters and cross-correlation
W Karlen, K Kobayashi, JM Ansermino… - Physiological …, 2012 - iopscience.iop.org
Pulse oximeters are monitors that noninvasively measure heart rate and blood oxygen
saturation (SpO 2). Unfortunately, pulse oximetry is prone to artifacts which negatively …
saturation (SpO 2). Unfortunately, pulse oximetry is prone to artifacts which negatively …
CapnoBase: Signal database and tools to collect, share and annotate respiratory signals
Methods Following institutional ethics approval, an in vivo data set was recorded and
extracted from 59 routine pediatric surgeries at the British Columbia Children's Hospital and …
extracted from 59 routine pediatric surgeries at the British Columbia Children's Hospital and …
[HTML][HTML] Development of a screening tool for sleep disordered breathing in children using the phone Oximeter™
Background Sleep disordered breathing (SDB) can lead to daytime sleepiness, growth
failure and developmental delay in children. Polysomnography (PSG), the gold standard to …
failure and developmental delay in children. Polysomnography (PSG), the gold standard to …
[HTML][HTML] Estimating respiratory and heart rates from the correntropy spectral density of the photoplethysmogram
The photoplethysmogram (PPG) obtained from pulse oximetry measures local variations of
blood volume in tissues, reflecting the peripheral pulse modulated by heart activity …
blood volume in tissues, reflecting the peripheral pulse modulated by heart activity …