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]      [File] 

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]      [File] 

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.

Karlen W, Pickard A, Ansermino JM. Automated Validation of Capillary Refill Time Measurements in Children. In: UBC Department of Anesthesiology, Pharmacology and Therapeutics 5th Annual Research Day. Vancouver, CA: 2011. p. 43.

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 Oct.. p. 66--71.      [DOI]      [File] 

Karlen W, Dumont GA, Petersen C, Gow J, Lim J, Sleiman J, Ansermino JM. Human-centered Phone Oximeter Interface Design for the Operating Room. In: Traver, Vicente and Fred, Ana and Filipe, Joaquim and Gamboa, Hugo, editors. Proc. of the Int. Conf. on Health Informatics (HEALTHINF). Rome, Italy: SciTePress - Science and and Technology Publications; 2011. p. 433--8.      [DOI]      [File] 

Karlen W, Hudson J, Lim J, Petersen C, Anand R, Dumont G, Ansermino JM. The Phone Oximeter. In: IEEE Engineering in Medicine and Biology Society Unconference. Boston, USA,: 2011.

Pickard A, Karlen W, Petersen C, Ansermino JM. A novel method of measuring capillary refill time using photo-plethysmography. In: UBC Department of Anesthesiology, Pharmacology and Therapeutics 4th Annual Research Day. Vancouver, CA: 2010.

Karlen W, Petersen C, Pickard A, Dumont GA, Ansermino JM. Capillary Refill Time Assessment Using a Mobile Phone Application. In: Proceedings of the 2010 Annual Meeting of the American Society Anesthesiologists. San Diego: American Society of Anesthesiologists; 2010. p. A575.     [File] 

Karlen W, Turner M, Cooke E, Dumont GA, Ansermino JM. CapnoBase: Signal database and tools to collect, share and annotate respiratory signals. In: Annual Meeting of the Society for Technology in Anesthesia (STA). West Palm Beach: 2010. p. 25.      [DOI]      [File] 

Raman S, Karlen W, Ansermino JM. Estimating Respiratory Rate from the Photoplethysmogram. In: Child and Family Research Institute Summer Student Research Day. Vancouver, CA: 2010.