• J Hudson, S M Nguku, J Sleiman, W Karlen, G A Dumont, C L Petersen, C B Warriner, and J M Ansermino.
• Department of Anaesthesiology, Pharmacology, and Therapeutics, University of British Columbia, British Columbia Children's Hospital, Vancouver, Canada. jthudson@gmail.com
• Anaesthesia. 2012 Sep 1;67(9):957-67.

AbstractTo increase the use of pulse oximetry by capitalise on the wide availability of mobile phones, we have designed, developed and evaluated a prototype pulse oximeter interfaced to a mobile phone. Usability of this Phone Oximeter was tested as part of a rapid prototyping process. Phase 1 of the study (20 subjects) was performed in Canada. Users performed 23 tasks, while thinking aloud. Time for completion of tasks and analysis of user response to a mobile phone usability questionnaire were used to evaluate usability. Five interface improvements were made to the prototype before evaluation in Phase 2 (15 subjects) in Uganda. The lack of previous pulse oximetry experience and mobile phone use increased median (IQR [range]) time taken to perform tasks from 219 (160-247 [118-274]) s in Phase 1 to 228 (151-501 [111-2661]) s in Phase 2. User feedback was positive and overall usability high (Phase 1--82%, Phase 2--78%).Anaesthesia © 2012 The Association of Anaesthetists of Great Britain and Ireland.

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