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Which of the following is a direct method for measuring foetal heart rate?

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Which of the following is a direct method for measuring foetal heart rate?

(a) Abdominal foetal electrocardiogram

(b) Foetal phonocardiogram

(c) Ultrasound technique

(d) Foetal ECG with scalp electrode

I got this question in an interview for internship.

The doubt is from Exercise Stress Testing topic in section Arrhythmia and Ambulatory Monitoring Instruments of Biomedical Instrumentation

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The correct answer is (d) Foetal ECG with scalp electrode

The best explanation: Abdominal foetal electrocardiogram, foetal phonocardiogram and Ultrasound technique are indirect methods of measuring foetal heart rate where as Foetal ECG with scalp electrode is a direct method as in it spiral, clip or suction electrode is attached to the presenting part of foetus.

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