Abstract
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.
References
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©2014 by Walter de Gruyter Berlin Boston
Articles in the same Issue
- Frontmatter
- Editorial
- Academy’s Corner – a new section at JPM
- Academy’s Corner
- Global education in perinatal medicine: will the bureaucracy or smartocracy prevail?
- Review articles
- Placental chorioangioma: literature review
- Sonographic measurement of cervical length as a predictor of preterm delivery: a systematic review
- Original articles – Obstetrics
- Peripartum anesthetic management of patients with Factor XI deficiency
- Risk of inferior vena cava compression syndrome during fetal MRI in the supine position – a retrospective analysis
- Fetal behavioral states are stable over daytime – evidence by longitudinal and cross-sectional fetal biomagnetic recordings
- Diet or medically treated gestational diabetes: is there any difference for obstetrical and neonatal complications? A French cohort study
- Cerebroplacental Doppler ratio and placental histopathological features in pregnancies complicated by fetal growth restriction
- Placental syndecan-1 and sulphated glycosaminoglycans are decreased in preeclampsia
- Pharmacological anti-thrombotic prophylaxis after elective caesarean delivery in thrombophilia unscreened women: should maternal age have a role in decision making?
- Values of T/QRS ratios measured during normal and post-term pregnancies
- The factors associated with the failure of transcatheter pelvic arterial embolization for intractable postpartum hemorrhage
- Hysteroscopic and laparoscopic management of uterine defects on previous cesarean delivery scars
- Chemerin concentrations in maternal and fetal compartments: implications for metabolic adaptations to normal human pregnancy
- Repetitive administration of acetylcholine receptor agonist rescues brain inflammation and brain damage after hypoxia-ischemia in newborn rat
- Original article – Fetus
- Fetal hydronephrosis: natural history and risk factors for postnatal surgery
- Original article – Newborn
- Cytomegalovirus infection among infants in California neonatal intensive care units, 2005–2010
- Letter to the Editors
- Origin of the long-term variability and acceleration of FHR studied for the prevention of cerebral palsy in fetal hypoxia and general insults
- Neonatal phototherapy, fluids, and photorelaxation
- Congress Calendar
- Congress Calendar
Articles in the same Issue
- Frontmatter
- Editorial
- Academy’s Corner – a new section at JPM
- Academy’s Corner
- Global education in perinatal medicine: will the bureaucracy or smartocracy prevail?
- Review articles
- Placental chorioangioma: literature review
- Sonographic measurement of cervical length as a predictor of preterm delivery: a systematic review
- Original articles – Obstetrics
- Peripartum anesthetic management of patients with Factor XI deficiency
- Risk of inferior vena cava compression syndrome during fetal MRI in the supine position – a retrospective analysis
- Fetal behavioral states are stable over daytime – evidence by longitudinal and cross-sectional fetal biomagnetic recordings
- Diet or medically treated gestational diabetes: is there any difference for obstetrical and neonatal complications? A French cohort study
- Cerebroplacental Doppler ratio and placental histopathological features in pregnancies complicated by fetal growth restriction
- Placental syndecan-1 and sulphated glycosaminoglycans are decreased in preeclampsia
- Pharmacological anti-thrombotic prophylaxis after elective caesarean delivery in thrombophilia unscreened women: should maternal age have a role in decision making?
- Values of T/QRS ratios measured during normal and post-term pregnancies
- The factors associated with the failure of transcatheter pelvic arterial embolization for intractable postpartum hemorrhage
- Hysteroscopic and laparoscopic management of uterine defects on previous cesarean delivery scars
- Chemerin concentrations in maternal and fetal compartments: implications for metabolic adaptations to normal human pregnancy
- Repetitive administration of acetylcholine receptor agonist rescues brain inflammation and brain damage after hypoxia-ischemia in newborn rat
- Original article – Fetus
- Fetal hydronephrosis: natural history and risk factors for postnatal surgery
- Original article – Newborn
- Cytomegalovirus infection among infants in California neonatal intensive care units, 2005–2010
- Letter to the Editors
- Origin of the long-term variability and acceleration of FHR studied for the prevention of cerebral palsy in fetal hypoxia and general insults
- Neonatal phototherapy, fluids, and photorelaxation
- Congress Calendar
- Congress Calendar