20.500.12556/RUL-134660 Assessing velocity and directionality of uterine electrical activity for preterm birth prediction using EHG surface records The aim of the present study was to assess the capability of conduction velocity amplitudes and directions of propagation of electrohysterogram (EHG) waves to better distinguish between preterm and term EHG surface records. Using short-time cross-correlation between pairs of bipolar EHG signals (upper and lower, left and right), the conduction velocities and their directions were estimated using preterm and term EHG records of the publicly available Term–Preterm EHG DataSet with Tocogram (TPEHGT DS) and for different frequency bands below and above 1.0 Hz, where contractions and the influence of the maternal heart rate on the uterus, respectively, are expected. No significant or preferred continuous direction of propagation was found in any of the non-contraction (dummy) or contraction intervals; however, on average, a significantly lower percentage of velocity vectors was found in the vertical direction, and significantly higher in the horizontal direction, for preterm dummy intervals above 1.0 Hz. The newly defined features—the percentages of velocities in the vertical and horizontal directions, in combination with the sample entropy of the EHG signal recorded in the vertical direction, obtained from dummy intervals above 1.0 Hz—showed the highest classification accuracy of 86.8% (AUC = 90.3%) in distinguishing between preterm and term EHG records of the TPEHGT DS. propagation of EHG waves cross correlation dummy intervals contraction intervals conduction velocity preterm birth prediction electrohysterogram short-time cross-correlation conduction velocity directionality propagacija EHG valov križna korelacija prazni intervali intervali s popadki hitrost prevajanja napovedovanje prezgodnjega poroda true false true Angleški jezik Slovenski jezik Članek v reviji 2022-01-24 14:52:29 2022-01-24 14:52:31 2022-09-13 03:56:23 0000-00-00 00:00:00 2020 0 0 30 str. iss. 24, art. 7328 Vol. 20 Dec. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 004:616.831-073.7-71 1424-8220 10.3390/s20247328 49646595 RAZ_Jager_Franc_2020.pdf RAZ_Jager_Franc_2020.pdf 1 92C5C4D19CC3BA1CCF06C1F0F19C227D 67248e37f5a79e48107494929a6f67847b1ac90ad5072af4d151c051f53bae34 fd47b2f0-7d1c-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=153209 https://www.mdpi.com/1424-8220/20/24/7328 1 ad2a7074-7d1c-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=153208 Fakulteta za računalništvo in informatiko Medicinska fakulteta 0 0 0