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In two-channel chart recorder, FHR is recorded on a calibrated chart in ________

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In two-channel chart recorder, FHR is recorded on a calibrated chart in ________

(a) cm/min

(b) m/min

(c) beats/min

(d) pulses/min

This question was addressed to me in an interview for job.

This key question is from Ear Oximeter in section Oximeters of Biomedical Instrumentation

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The correct option is (c) beats/min

For explanation: A two-channel chart recorder is incorporated in instruments used for monitoring labour activity. One channel records FHR on a calibrated chart in beats per minute (50–210 bpm) while the other channel is used for recording uterine contractions calibrated 0-100 mmHg. The standard chart speed is usually 1 or 2 cm/min.

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