Development of machine learning models for vital signs monitoring

• Main Author: Seenivasan Sindhu Barathi
• Other Authors: Muhammad Faeyz Karim
• Format: Thesis-Master by Coursework
• Language: English
• Published: Nanyang Technological University 2023
• Subjects: Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/164024
• Institution: Nanyang Technological University

Blood pressure is an important clinical vital sign nowadays and it is recommended to monitor the blood pressure measurements daily to reduce the risks of high blood pressure. Generally, Blood pressure measurements are made using contact and non-contact methods. This study proposes a non-contact blood pressure measurement which uses two frequency modulated continuous wave (FMCW) mm-wave radars to detect the heart rate, and breathing rate, and a cuff-based OMRON device for blood pressure prediction. Databases were created and collected from 53 subjects using mm-wave radar that can extract the chest and neck pulse waveforms. In this experiment, the systolic blood pressure (SBP) and diastolic blood pressure (DBP) data were collected from the subject using an OMRON device. The datasets have been pre-processed with signal processing and a total of 54 features have been extracted. The processed data is trained with a deep neural network model with the Bonobo optimization algorithm for accurate prediction of both SBP and DBP. Moreover, this study compares the other machine learning models and achieves an RMSE value of SBP of 0.3068 and an RMSE value of DBP of 0.2282. The model has been tested for 15 subjects with 5 pulse waveforms (150 seconds) and 1 pulse waveform (30 seconds) at a distance of 0.5-1 metre using radar and blood pressure results are compared with the OMRON device. The tested results achieve a (Mean Absolute error ± Standard deviation) of SBP as 2.267±1.340 mmHg and DBP as 2.433±1.616 mmHg, which meets the AAMI requirements. Hence, while comparing with other models, our proposed study outperforms the results and achieves an overall accuracy of 93%.