Jun 25 -29

During this week:

  • A data base of Photoplethysmography data containing 42 cases, 8 minutes long, (29 children and 13 adults) was downloaded and processed using MathLab and Microsoft Excel. The data files will be saved in a the final csv format. Some of this data, even filtered and processed, present some kind of DC noise, but are still very useful for this research

(Data source: http://www.capnobase.org/database/pulse-oximeter-ieee-tbme-benchmark/)

  • TheĀ GUI interface was tested with some of this data. A good match to the data in the times was achieved even with only the first two harmonics of the Fourier series. This analytical expressions can be considered a filtered signal.

There is a limitation in this graphical approach: The precisions of the sliders. By now is only possible a two decimals precision in the values.

  • Some research works have been explored to understand how to process this analytical function fitted to the PPG data in order to obtain information about the cardiovascular condition of the these persons. If was found that the first and second derivatives can give numbers that correlate with artery stiffness, a problem that comes with aging. Numbers obtained from these derivatives may help to diagnose other cardiovascular diseases like hypertension.
  • The possibility to integrate in the GUI a routine to calculate the derivatives of the analytical expressions and obtain the necessary information from them was considered.
  • First draft of Research summary was written.

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