Numerical analysis of the human fetal heart rate: the quality of ultrasound records
| Autor: | G.H.A. Visser, Christopher W.G. Redman, J.D.S. Goodman, G. S. Dawes |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
medicine.medical_specialty
Transducers Fetal heart Electrocardiography Fetal Heart Heart Rate Pregnancy Internal medicine Terminology as Topic Heart rate Abdomen medicine Humans Fetal Monitoring Electrodes Ultrasonography Fetus Scalp medicine.diagnostic_test Pulse (signal processing) business.industry Ultrasound Obstetrics and Gynecology medicine.disease Surgery Human fetal Cardiology Female business |
| Zdroj: | American journal of obstetrics and gynecology. 141(1) |
| ISSN: | 0002-9378 |
| Popis: | A method is described for the computerized numerical analysis of fetal heart periods (pulse intervals). It uses a digital filter to separate the record into its high- and low-frequency components and, after removal of baseline variation, identifies accelerations and decelerations of all sizes. It provides an objective method for separating episodes of high heart period variation, normally associated with fetal movements, from episodes of low variation. When Doppler ultrasound is used in the last 10 weeks of gestation, failure time averages 40%. Signal loss is not randomly distributed; it is on average 75% greater during episodes of high heart period variation, although it is not particularly associated with fetal movements as identified by nurse or patient. Nevertheless a comparison of simultaneous direct ECG and ultrasound records shows that the latter provide reasonable statistical measures of heart period variation, and also of accelerations and decelerations provided that signal loss is taken into account. The system thus provides a particularly useful adjunct to the analysis of antenatal human fetal heart rate records. |
| Databáze: | OpenAIRE |
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