Mr. Anders Johansson Profile

Anders Johansson

at Uppsala Univ

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Proceedings Article | 24 October 2001 Paper

Neural network for photoplethysmographic respiratory rate monitoring

Anders Johansson

Proceedings Volume 4434, (2001) https://doi.org/10.1117/12.446666

KEYWORDS: Neural networks, Error analysis, Neurons, Heart, Detection and tracking algorithms, Blood, Pattern recognition, Sensors, Amplitude modulation, Photoplethysmography

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The photoplethysmographic signal (PPG) includes respiratory components seen as frequency modulation of the heart rate (respiratory sinus arrhythmia, RSA), amplitude modulation of the cardiac pulse, and respiratory induced intensity variations (RIIV) in the PPG baseline. The aim of this study was to evaluate the accuracy of these components in determining respiratory rate, and to combine the components in a neural network for improved accuracy. The primary goal is to design a PPG ventilation monitoring system. PPG signals were recorded from 15 healthy subjects. From these signals, the systolic waveform, diastolic waveform, respiratory sinus arrhythmia, pulse amplitude and RIIV were extracted. By using simple algorithms, the rates of false positive and false negative detection of breaths were calculated for each of the five components in a separate analysis. Furthermore, a simple neural network (NN) was tried out in a combined pattern recognition approach. In the separate analysis, the error rates (sum of false positives and false negatives) ranged from 9.7% (pulse amplitude) to 14.5% (systolic waveform). The corresponding value of the NN analysis was 9.5-9.6%.

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