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What is the range of FHR measurement due to substitution logic?(a) 0-200 bpm(b) 40-240 bpm(c) 20-220 bpm(d) 60-260 bpmI had been asked this question during an internship interview.Enquiry is from Ambulatory Monitoring Instruments in division Arrhythmia and Ambulatory Monitoring Instruments of Biomedical Instrumentation

Answer»

Correct choice is (b) 40-240 bpm

Easy explanation: The SUBSTITUTION logic REQUIRES a delay time to establish a missing foetal TRIGGER pulse. It is thus kept as 270 ms. The range of FHR measurement is limited to 40–240 bpm because of the substitution logic. Thereafter, the output of logic CIRCUITS goes to standard heart rate computing circuits.



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