AIM: To evaluate values and variability of T/QRS ratios between 28 and 42 weeks' gestation in term and post-term pregnancies using non-invasive methods with electrodes placed over the maternal abdomen. METHODS: Fetal electrocardiograms were recorded from 657 women with singleton pregnancies. Recorded signals were analyzed by KOMPOREL software from ITAM (Zabrze, Poland) and the T/QRS ratios were automatically calculated. The analyses were performed in subgroups according to gestational age. The T/QRS ratio variables were calculated; one-way analysis of variance (ANOVA test) and linear regression were carried out. RESULTS: The T/QRS ratio was successfully measured in 95.4% (n=627) of patients during 30 min recordings. Values of T/QRS ratio variables changed during pregnancy. The mean T/QRS ratio ranged between 0.134 in the 41st gestational week and 0.178 in the 35th gestational week. Mean minimal and maximum values of the T/QRS ratio ranged between 0.02 and 0.29 [x=0.09; standard deviation (SD)=0.05] and 0.08 and 0.5 (x=0.27; SD=0.1), respectively. The highest values occurred in pre-term and post-term pregnancies. CONCLUSIONS: Measurement of the T/QRS ratio is one of the techniques used for non-invasive fetal distress assessment that can be used in antepartum fetal monitoring. Values of T/QRS ratio variables changed during pregnancy from higher in pre-term pregnancies, lower in the peripartum period and rose again in post-term pregnancies. The study provides more insight into the values of T/QRS ratios during pregnancy; however, additional research is required.
AIM: To evaluate values and variability of T/QRS ratios between 28 and 42 weeks' gestation in term and post-term pregnancies using non-invasive methods with electrodes placed over the maternal abdomen. METHODS: Fetal electrocardiograms were recorded from 657 women with singleton pregnancies. Recorded signals were analyzed by KOMPOREL software from ITAM (Zabrze, Poland) and the T/QRS ratios were automatically calculated. The analyses were performed in subgroups according to gestational age. The T/QRS ratio variables were calculated; one-way analysis of variance (ANOVA test) and linear regression were carried out. RESULTS: The T/QRS ratio was successfully measured in 95.4% (n=627) of patients during 30 min recordings. Values of T/QRS ratio variables changed during pregnancy. The mean T/QRS ratio ranged between 0.134 in the 41st gestational week and 0.178 in the 35th gestational week. Mean minimal and maximum values of the T/QRS ratio ranged between 0.02 and 0.29 [x=0.09; standard deviation (SD)=0.05] and 0.08 and 0.5 (x=0.27; SD=0.1), respectively. The highest values occurred in pre-term and post-term pregnancies. CONCLUSIONS: Measurement of the T/QRS ratio is one of the techniques used for non-invasive fetal distress assessment that can be used in antepartum fetal monitoring. Values of T/QRS ratio variables changed during pregnancy from higher in pre-term pregnancies, lower in the peripartum period and rose again in post-term pregnancies. The study provides more insight into the values of T/QRS ratios during pregnancy; however, additional research is required.
Authors: Kajal K Tamber; Dexter J L Hayes; Stephen J Carey; Jayawan H B Wijekoon; Alexander E P Heazell Journal: PLoS One Date: 2020-12-01 Impact factor: 3.240
Authors: Janusz Jezewski; Janusz Wrobel; Adam Matonia; Krzysztof Horoba; Radek Martinek; Tomasz Kupka; Michal Jezewski Journal: Front Physiol Date: 2017-05-16 Impact factor: 4.566
Authors: Adam Matonia; Janusz Jezewski; Tomasz Kupka; Michał Jezewski; Krzysztof Horoba; Janusz Wrobel; Robert Czabanski; Radana Kahankowa Journal: Sci Data Date: 2020-06-25 Impact factor: 6.444