Multiclass Classification of APG Signals using ELM for CVD Risk Identification: A Real-Time Application

Abstract

In this paper,we present a non-invasive method of classifying a subject’s health as “Healthy” or “At Risk” of cardiovascular disease (CVD). The novelty of the work lies in recognizing the rare case of a young subject with cardiovascular disease as well as old subjects who are healthy, and the real-time implementation of CVD risk analysis. Thirty healthy and thirty pathological signals are pre-processed using Empirical Mode Decomposition (EMD), later, the analysis of the acceleration plethysmogram (APG) signals are carried out. Seven features of the wave contour are extracted along with actual age of the subject, four classes are identified using an extreme learning machine (ELM) classifier, and we made four groupswhich are, Healthy Young, Unhealthy Young, Healthy Old, and Unhealthy Old. Implementation of the proposed system is done on a Raspberry Pi 2 using the Python programming language. The training of the classifier and prediction of CVD risk group, using the extracted features, takes on average 17.83 milliseconds. The overall accuracy of the system is 86%.