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Fetal ECG during labour: a presentation of a microprocessor system
Institution:1. Department of Obstetrics and Gynaecology, Gothenburg University, Gothenburg, Sweden;2. Department of Obstetrics and Gynaecology, National University of Singapore Singapore;3. Department of Applied Electronics, Chalmers University of Technology, Gothenburg, Sweden;4. Division of Perinatal Physiology, Departments of Physiology and Paediatrics, Gothenburg University, PO Box 33031, S-400 33, Gothenburg, Sweden;1. Section of Neonatology, Department of Pediatrics, University of Calgary, Calgary, Alberta, Canada;2. Section of Pediatric Neurology, Department of Pediatrics, University of Calgary, Calgary, Alberta, Canada;3. Departments of Diagnostic Imaging and Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada;1. Department of Electrical and Computer Engineering, University of Seoul, Seoul 02504, Republic of Korea;2. School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea;3. Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, Republic of Korea;4. SK Hynix, Icheon 17336, Republic of Korea;5. Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16410, Republic of Korea;1. Department of Obstetrics and Gynaecology, Medical School, Institute of Biomedical Engineering, University of Porto, Porto, Portugal;2. Department of Obstetrics and Gynaecology, Center for Medical Informatics, Medical School, Federal University of Minas Gerais, Minas Gerais, Brazil;1. Department of Obstetrics and Gynecology, Hospital Universitari i Politècnic La Fe, Valencia, Spain;2. Department of Gynecology, Hospital Universitario Bellvitge-Idibell, Barcelona, Spain;3. Department of Microbiology, Hospital Universitari i Politècnic La Fe, Valencia, Spain;4. Department of Pediatrics, Hospital Universitari i Politècnic La Fe, Valencia, Spain;5. Facultad Medicina, Departamento Pediatría Obstetricia y Ginecología, Universidad Valencia, Spain;1. Division of Pediatric Infectious Diseases, The University of Alabama at Birmingham, 1600 Seventh Avenue South, CHB 308, Birmingham, AL 35233, USA;2. Division of Pediatric Infectious Diseases, The University of Alabama at Birmingham, 1600 Seventh Avenue South, CHB 303, Birmingham, AL 35233, USA
Abstract:Changes in the ST waveform of the fetal ECG have been detected in 47 term deliveries with vertex presentations using a specially developed microprocessor-based system for on-line recording of T wave amplitude. The T wave was quantified by the T/QRS ratio. The recording included one scalp electrode for exploration and a maternal skin electrode as reference. Signal quality allowed optimal ST waveform assessment in 89% of the cases. The degree of perinatal asphyxia was judged from cord artery acid-base status and the neonatal outcome. In completely normal fetuses at term the mean T/QRS ratio was 0.148 with a standard deviation of 0.048. With this basic information we can proceed in the investigation of the T/QRS ratio as a means for fetal surveillance.
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