Journal
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING
Volume 51, Issue 9, Pages 965-970Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11517-013-1068-z
Keywords
Oximetry; Plethysmogram; Wheezy; Children
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Funding
- Department of Health [PB-PG-0610-22433] Funding Source: Medline
- National Institutes of Health Research (NIHR) [PB-PG-0610-22433] Funding Source: National Institutes of Health Research (NIHR)
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The aim of this study was to investigate whether respiratory information can be derived from pulse oximetry plethysmogram (pleth) recordings in acutely wheezy preschool children. A digital pulse oximeter was connected via 'Bluetooth' to a notebook computer in order to acquire pleth data. Low pass filtering and frequency analysis were used to derive respiratory rate from the pleth trace; the ratio of heart rate to respiratory rate (HR/RR) was also calculated. Recordings were obtained during acute wheezy episodes in 18 children of median age 31 months and follow-up recordings from 16 of the children were obtained when they were wheeze-free. For the acutely wheezy children, frequency analysis of the pleth waveform was within 10 breaths/min of clinical assessment in 25 of 29 recordings in 15 children. For the follow-up measurements, frequency analysis of the pleth waveform showed similarly good agreement in recordings on 15 of the 16 children. Respiratory rate was higher (p < 0.001), and HR/RR ratio was lower (p = 0.03) during acute wheeze than at follow-up. This study suggests that respiratory rate can be derived from pleth traces in wheezy preschool children.
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