Generación de señales simuladas de ECG abdominal a partir de un modelo abdominal 3D

Abstract

Abdominal ECG is one of the most promising monitoring techniques for fetal surveillance in the antenatal period, as it presents easy availability and allows the maternal and fetal monitoring simultaneously. However, separation of these signals is complicated and there is no standardized way to evaluate the effectiveness of separation algorithms reported in the literature. Based on the dipole model spread through the three-dimensional maternal abdomen, this paper proposes the implementation of a system for the generation of abdominal ECG signals with controllable characteristics simulating real conditions by interference, heart period variability, number of channels , electrodes location and fetal position. Using the developed system, 50 synthetic test signals were generated and compared with desired values. Results showed a correlation of 0.99 with respect to expected values in the signal interference ratio, with no significant differences in the regression (p>0.05); while the correlation coefficient was 0.87 for the signal to noise ratio, with significant differences below -20 dB (p<0.05) in the regression. In conclusion, the proposed system provides abdominal ECG signals showing similar conditions to those of real signals, and comprises a tool that ensures proper evaluation of separation algorithms of maternal and fetal ECG from abdominal ECG.