Monitoring the respiratory rate by miniature motion sensors in premature infants: a comparative study

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Abstract

OBJECTIVE:

Existing respiratory rate (RR) monitors suffer from inaccuracy. The study assesses the accuracy of a novel modality that monitors lung ventilation with miniature motion sensors.

STUDY DESIGN:

RR was measured by three methods: impedance technology, motion sensors and visual count, in babies (n = 9) that breathed spontaneously or with respiratory support and babies (n = 12) that received high-frequency oscillatory ventilation (HFOV).

RESULTS:

A line close to equality (slope = 0.96, r2 = 0.83) was obtained between the motion sensor and the visual count of the RR with narrow 95% limits of agreements (< 14.0 b.p.m.). The relationship between the impedance and the visual count showed a lower correlation (r2 = 0.65) and wider 95% limits of agreements (21.4 b.p.m.). The motion sensor- and the ventilator-determined RRs demonstrated a good agreement during HFOV, whereas the impedance failed to measure the RR during HFOV.

CONCLUSION:

Monitoring RR with motion sensors is more accurate compared with the impedance, in infants, in all ventilation modes.

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