PEDIATRICS Vol. 74 No. 5 November 1984, pp. 763-777
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Sequential 22-Hour Profiles of Breathing Patterns and Heart Rate in 110 Full-Term Infants During Their First 6 Months of Life

J. M. Richards BSc1, J. R. Alexander MSc, FSS, MIS1, E. A. Shinebourne MD, FRCP1, M. de Swiet MD, FRCP1, A. J. Wilson PhD1, and D. P. Southall MD, MRCP1

1 From the Department of Paediatrics, Cardiothoracic Institute, Brompton Hospital, London; Department of Mathematics, Statistics and Computing, Thames Polytechnic, Woolwich, London; and Department of Medical Physics, Royal Hallamshire Hospital, Sheffield, England

Sequential recordings (total number 365, mean duration 22 hours) of ECG and abdominal wall movement were obtained from 110 full-term infants up to 6 months of age. The longest pause in breathing movement per recording (maximum 21.6 seconds) decreased in duration over the first 2 weeks of life (P < .005). Pauses >18.0 seconds were not detected after seven days. The spread of values for pauses ge3.6 seconds duration was widest during the first 2 weeks, and their number decreased with age (P < .001). Periodic breathing, detected in 69% to 80% of infants in all age groups, showed decreasing trends with age in total duration and maximum length of episode (P < .005 for both). The spread of values was widest during the first 2 weeks (range for total duration 0 to 4.7 hours) and decreased with age. The mean respiratory rate during regular breathing decreased after 4 weeks (P < .001). The spread of values was widest during the first 2 weeks and decreased with age. Birth weight was positively correlated with mean respiratory rate during the first three days of life (r = +.64, P < .001). The mean heart rate during regular breathing increased during the first 15 days (P < .001) and then decreased after 4 weeks (P < .001). Higher mean heart rates were found in male infants (P < .01).

Key Words: 24-hour recordings • apnea • periodic breathing • heart and respiratory rates • normal infant data

Submitted on November 3, 1983
Accepted on March 13, 1984




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