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What is the chart speed in cardiotocograph to provide sufficient resolution of the stimulus-response relationship?

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What is the chart speed in cardiotocograph to provide sufficient resolution of the stimulus-response relationship?

(a) 1-2 cm / sec

(b) 2-3 cm / min

(c) 1-2 cm / min

(d) 2-3 cm / sec

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Question is from Data Compression Techniques topic in section Arrhythmia and Ambulatory Monitoring Instruments of Biomedical Instrumentation

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Correct option is (c) 1-2 cm / min

Explanation: Normally, accuracy of measurement of foetal heart rate may be 2-3% for classification for responses. Sensitivity of 20 bpm /cm of the recording chart allows adequate reading of the recorder FHR. Labour activity and FHR traces are usually recorded simultaneously on the same time scale. Chart speed of 1-2 cm/min is adequate to provide sufficient resolution of the stimulus-response relationship.

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