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What is the range of Instantaneous beat to beat rate digitally displayed?

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What is the range of Instantaneous beat to beat rate digitally displayed?

(a) 0 to 50 bpm

(b) 50 to 210 bpm

(c) 210 to 350 bpm

(d) 350 to 410 bpm

This question was posed to me in an interview.

Question is taken from Ear Oximeter topic in portion Oximeters of Biomedical Instrumentation

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The correct answer is (b) 50 to 210 bpm

To explain: Instantaneous “beat-to-beat” rate is displayed on a calibrated linear scale or digitally displayed with a range from 50 to 210 bpm. 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.

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