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Which of the following is the most reliable method for detecting FHR pattern?

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Which of the following is the most reliable method for detecting FHR pattern?

(a) Abdominal foetal electrocardiogram

(b) Foetal phonocardiogram

(c) Ultrasound technique

(d) Foetal ECG with scalp electrode

I have been asked this question by my school principal while I was bunking the class.

This intriguing question comes from Oximeters in portion Oximeters of Biomedical Instrumentation

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The correct choice is (c) Ultrasound technique

For explanation I would say: We can hear the signal through a loudspeaker with a scarce chance of failing to recognize any beat, but a simple electronic circuit may fail to trigger from this signal. Still, the ultrasound Doppler shift method is more practical and easy to use during labour. It is currently the most reliable method for detecting the FHR pattern that is interpretable.

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