Desenvolvimento de um protótipo de monitoramento de pressão arterial sistêmica baseado em fotopletismografia

Abstract

The proposal of this Master's thesis is to present a device for the measurement of the blood pressure, for any kind of person who wants to measure it without leaving their home. It was thought of as a friendly, comfortable, easy-to-use solution that would allow monitoring of the blood pressure in the patient's own home, in order to predict the possibility of hypertension and thus prevent it. The implementation was done using a sensor MAX-30101, which is an integrated module with pulse oximetry and frequency monitor which uses a non-invasive technique to generate the photoplethysmography signal. Later, digital bandpass filters were used (Butterworth, Chebyshev Type II and Chebyshev Type I) and then a graphical interface was created that can be used both by an engineer and by the user (patient) and also by the doctor through, including mobile application. To be able to show the stages of systolic and diastolic, defined in accordance with Brazilian cardiology guidelines in stages of hypertension from 0 to 4, a code was created using the Python program (Version 3.6), showing the sign of photoplethysmography in graphics and a neural network using the libraries NumPy, Keras and Scikit-learn to quantify the stage of hypertension, obtaining a success rate of 80.9% in systolic and 74.74% in diastolic. In the end, the system takes taking into account the stages of diastolic and systolic hypertension to determine the stage of patient hypertension. Keywords: Photopletismography; Bluetooth; Blood Pressure; Prototype; Cardiology; Pressure measurement