Complete foetal ECG morphology recording by synchronised adaptive filtration.
Present noninvasively measured indices of foetal stress are indirect and not sufficient. Foetal electrocardiography (FECG) is a potential noninvasive measurement of the foetus wellbeing which has been little utilised because of the difficulties of measuring it. The development of time-sequenced adaptive filters which are synchronised to the QRS complex by the use of Doppler echocardiography allowed the recording of relatively noise-free FECG. The paper describes the use of this technique for obtaining the complete complex of the FECG. Several sets of time-sequenced adaptive filters are combined to allow a multilead abdominal recording to produce a measurement system which rejects maternal ECG and enhances the FECG. Five subjects have been analysed, and their FECGs have been accurately reproduced with minimal changes of the filters' parameters.
Adam
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Department of Biomedical Engineering, Technion-Israel Institute of Technology, Haifa, Israel.
Shavit
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D004562:Electrocardiography; D005318:Fetal Heart / Q000502:physiology*; D005323:Fetal Monitoring / Q000295:instrumentation*; D005374:Filtration / Q000295:instrumentation; D006801:Humans; D012815:Signal Processing, Computer-Assisted