• Emerg Med J · Nov 2003

    Standard pulse oximeters can be used to monitor respiratory rate.

    • P Leonard, T F Beattie, P S Addison, and J N Watson.
    • Department of Accident and Emergency Medicine, The Royal Hospital for Sick Children, Edinburgh, Scotland. paul_leonard@blueyonder.co.uk
    • Emerg Med J. 2003 Nov 1; 20 (6): 524-5.

    BackgroundOne of the most important limitations of standard pulse oximeters is the inability to detect changes in respiratory rate until oxygenation is affected. This study sought to determine if analysis of the plethysmogram by wavelet transforms would enable the determination of changes in respiratory rate at an earlier stage.MethodsTen healthy adult volunteers were monitored, breathing at baseline and predetermined respiratory rates, using a standard pulse oximeter. Photo-plethysmograms captured in an attached lap top computer were then analysed using wavelet transforms.ResultsDetermination of baseline respiratory rate and subsequent changes including apnoea were easily identified.CommentWavelet transforms permit the accurate determination of respiratory rate by a standard pulse oximeter.

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