Dehkordi P, Garde A, Karlen W, Petersen CL, Ansermino JM, Dumont GA. Detrended fluctuation analysis of photoplethysmogram pulse rate intervals in sleep disordered breathing. In: 2014 IEEE Healthcare Innovation Conference (HIC). Seattle: IEEE Engineering in Medicine and Biology Society; 2014. p. 323--326.      [DOI]      [Datei] 

Garde A, Dehkordi P, Karlen W, Wensley D, Ansermino JM, Dumont GA. Development of a screening tool for sleep disordered breathing in children using the phone oximeter™. PLoS ONE. 2014; 9(11):e112959.      [DOI]      [Datei] 

Wiens MO, Gan H, Kabakyenga J, Barigye C, Zhou G, Karlen W, Ansermino JM, Larson C, MacLeod S. Early and late outcomes following treatment for sick-child visits at a rural level IV Health Center in Uganda. In: 17th World Congress of Basic and Clinical Pharmacology. Cape Town: 2014.

Garde A, Karlen W, Ansermino JM, Dumont GA. Estimating respiratory and heart rates from the correntropy spectral density of the photoplethysmogram. PLoS ONE. 2014; 9(1):e86427.      [DOI]      [Datei] 

Karlen W, Gan H, Chiu M, Dunsmuir D, Zhou G, Dumont GA, Ansermino JM. Improving the accuracy and efficiency of respiratory rate measurements in children using mobile devices. PLoS ONE. 2014; 9(6):e99266.      [DOI]      [Datei] 

Karlen, Walter, editors. Mobile Point-of-Care Monitors and Diagnostic Device Design. Boca Raton: CRC Press; 2014.     [Datei] 

Garde A, Karlen W, Dehkordi P, Ansermino JM, Dumont GA. Oxygen saturation resolution influences regularity measurements. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Chicago: IEEE Engineering in Medicine and Biology Society; 2014. p. 2257--60.      [DOI]      [Datei] 

Karlen W, Garde A, Myers D, Scheffer C, Ansermino JM, Dumont GA. Respiratory Rate Assessment from Photoplethysmographic Imaging. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Chicago,IL,USA: IEEE Engineering in Medicine and Biology Society; 2014. p. 5397--400.

Karlen W, Dumont GA, Scheffer C. Sharing Vital Signs between mobile phone applications. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). 2014. p. 3646--9.      [DOI]      [Datei] 

Dehkordi P, Garde A, Karlen W, Wensley D, Ansermino JM, Dumont GA. Sleep Stage Classification in Children Using Photoplethysmogram Pulse Rate Variability. In: Computing in Cardiology (CinC). 2014. p. 297--300.

Dunsmuir D, Karlen W, Gan H, Chiu M, Petersen CL, Dumont GA, Ansermino JM. The design of a respiratory rate mobile application. In: International Anesthesia Research Society Annual Meeting. 2014.

Crede S, Merwe G, Hutchinson J, Woods D, Karlen W, Lawn J. Where do pulse oximeter probes break?. Journal of clinical monitoring and computing. 2014; 28(3):309--14.      [DOI]      [Datei] 

Karlen W, Ettinger KM. Ethics Consultation In Mobile Health Application Design. In: Abstracts of the Global Health & Innovation Conference. Yale, USA: Unite for Sight; 2013 Apr..

Garde A, Karlen W, Dehkordi P, Wensley D, Ansermino JM, Dumont GA. Analysis of Oxygen Saturation in Children with Obstructive Sleep Apnea Using the Phone-Oximeter. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Osaka: 2013. p. 2531--4.

Karlen W, Ansermino JM, Dumont GA, Scheffer C. Detection of the optimal region of interest for camera oximetry. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Osaka: 2013. p. 2263--6.      [DOI]      [Datei] 

Garde A, Karlen W, Dehkordi P, Ansermino JM, Dumont GA. Empirical mode decomposition for respiratory and heart rate estimation from the photoplethysmogram. In: Murray, Alan, editors. Computing in Cardiology (CinC). Zaragoza: IEEE; 2013. p. 799--802.     [Datei] 

Karlen W. Empowering Home-Based Carers with Medical Applications on Mobile Phones in the Western Cape. In: Sustainable Rural Health Research Day. Worcester, South Africa: 2013.

Brouse CJ, Karlen W, Dumont GA, Myers D, Cooke E, Stinson J, Lim J, Ansermino JM. Monitoring nociception during general anesthesia with cardiorespiratory coherence. Journal of clinical monitoring and computing. 2013; 27(5):551--60.      [DOI]      [Datei] 

Karlen W, Raman S, Ansermino JM, Dumont GA. Multiparameter respiratory rate estimation from the photoplethysmogram. IEEE Transactions on Biomedical Engineering. 2013; 60(7):1946--53.      [DOI]      [Datei] 

Karlen W, Petersen C, Gow J, Ansermino JM, Dumont GA. Photoplethysmogram Processing Using An Adaptive Single Frequency Phase Vocoder Algorithm. In: Fred, A and Filipe, J and Gamboa, H, editors. BIOSTEC 2011, CCIS 273. Berlin Heidelberg: Springer-Verlag; 2013. p. 31--42.      [DOI]      [Datei] 

Karlen W. Pulse Oximeters on Mobile Phones for Rural Health Care. In: Sustainable Rural Health Research Day. Worcester, South Africa: 2013.

Dehkordi P, Garde A, Karlen W, Wensley D, Ansermino JM, Dumont GA. Pulse rate variability compared with heart rate variability in children with and without sleep disordered breathing. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). 2013. p. 6563--6.

Dehkordi P, Garde A, Karlen W, Wensley D, Ansermino JM, Dumont GA. Pulse Rate Variability in Children with Disordered Breathing During Different Sleep Stages. In: Computing in Cardiology (CinC). Zaragoza: IEEE; 2013. p. 1015 -- 8.     [Datei] 

Karlen W, Lim J, Ansermino JM, Dumont GA, Scheffer C. Recognition of correct finger placement for photoplethysmographic imaging. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Osaka: 2013. p. 7480--3.      [DOI]      [Datei] 

Chiu M, Karlen W, Dunsmuir D, Görges M, Gan H, Lim J, Ansermino JM. The RRate Mobile App; Developing a robust measure of respiratory rate for use in low-resource settings. In: Child and Family Research Institute Summer Student Research Day. Vancouver, CA: 2013.

Karlen W, Kobayashi K, Ansermino JM, Dumont GA. Photoplethysmogram signal quality estimation using repeated Gaussian filters and cross-correlation. Physiological Measurement. 2012 Sep.; 33(10):1617--29.      [DOI]      [Datei] 

Karlen W, Ansermino JM, Dumont G. Adaptive pulse segmentation and artifact detection in photoplethysmography for mobile applications. In: 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society. San Diego: IEEE; 2012 Aug.. p. 3131--3134.      [DOI]      [Datei] 

Chandler JR, Cooke E, Petersen C, Karlen W, Froese N, Lim J, Ansermino JM. Pulse oximeter plethysmograph variation and its relationship to the arterial waveform in mechanically ventilated children. Journal of clinical monitoring and computing. 2012 Jun.; 26(3):145--51.      [DOI]      [Datei] 

Raman S, Brouse CJ, Karlen W, Dumont GA, Ansermino JM. A Data Fusion Approach for RR estimation from PPG (STA Engineering Challenge). In: Proceedings of the 2012 Society for Technology in Anesthesia Annual Meeting. West Palm Beach: 2012.

Karlen W, Lim J, Ansermino JM, Dumont GA, Scheffer C. Design challenges for camera oximetry on a mobile phone. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). 2012 Jan.. p. 2448--51.      [DOI]      [Datei] 

Brouse CJ, Karlen W, Myers D, Cooke E, Stinson J, Lim J, Ansermino JM. Measuring Adequacy of Analgesia with Cardiorespiratory Coherence. In: Abstracts of the 2012 Annual Meeting of the Society for Technology in Anesthesia (STA). West Palm Beach: Anesthesia and analgesia; 2012. p. S8.      [DOI]      [Datei] 

Brouse CJ, Karlen W, Dumont GA, Myers D, Cooke E, Stinson J, Lim J, Ansermino JM. Real-time cardiorespiratory coherence detects antinociception during general anesthesia. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). 2012 Jan.. p. 3813--6.      [DOI]      [Datei] 

Dunsmuir D, Petersen C, Karlen W, Lim J, Ansermino JM. The Phone Oximeter for Mobile Spot-Check. In: Abstracts of the 2012 Annual Meeting of the Society for Technology in Anesthesia (STA). West Palm Beach: Anesthesia and analgesia; 2012. p. S21.

Hudson J, Nguku SM, Sleiman J, Karlen W, Dumont GA, Petersen C, Warriner CB, Ansermino JM. Usability testing of a prototype Phone Oximeter with healthcare providers in high- and low-medical resource environments. Anaesthesia. 2012; 67(9):957--67.      [DOI]      [Datei] 

Karlen W, Pickard A, Daniels J, Kwizera A, Ibingira C, Dumont GA, Ansermino JM. Automated Validation of Capillary Refill Time Measurements Using Photo-Plethysmogram from a Portable Device for Effective Triage in Children. In: 2011 IEEE Global Humanitarian Technology Conference (GHTC). IEEE; 2011 Okt.. p. 66--71.      [DOI]      [Datei] 

Karlen W, Blackstock M, Ansermino JM. Location independence in patient monitoring. In: Abstracts of the 2011 Annual Meeting of the Society for Technology in Anesthesia (STA). Las Vegas: Anesthesia and Analgesia; 2011 Aug.. p. S37.      [DOI]      [Datei] 

Karlen W, Brouse CJ, Cooke E, Ansermino JM, Dumont GA. Respiratory rate estimation using respiratory sinus arrhythmia from photoplethysmography. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Boston: 2011 Aug.. p. 1201--4.      [DOI]      [Datei] 

Brouse CJ, Karlen W, Myers D, Cooke E, Stinson J, Lim J, Dumont GA, Ansermino JM. Wavelet transform cardiorespiratory coherence detects patient movement during general anesthesia. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). 2011 Aug.. p. 6114--7.      [DOI]      [Datei] 

Pickard A, Karlen W, Ansermino JM. Medical intelligence article: capillary refill time: is it still a useful clinical sign?. Anesthesia and analgesia. 2011 Jul.; 113(1):120--3.      [DOI]      [Datei] 

Karlen W, Petersen C, Gow J, Ansermino JM, Dumont GA. An Adaptive Single Frequency Phase Vocoder For Low-power Heart Rate Detection. In: BIODEVICES 2011 - Proceedings of the International Conference on Biomedical Electronics and Devices, Rome, Italy, January 26-29, 2011. INSTICC Press; 2011. p. 30--35.