The influence of sleep state and position on respiratory variability (RV) was studied in 13 preterm infants (PTIs) and 19 term infants (TIs). Temporally matched epochs of nasal pressure and oxygen saturation (Sp(O2)) data were extracted from nap polysomnography. Inspiratory onset times (I) were determined, and variability measures of the I-I interval compared in quiet sleep and active sleep, prone and supine and with age. Sleep state influenced respiratory variability (RV) in PTI and TI but Sp(O2) only varied with sleep state in PTI (p = 0.03). Position had no effect on RV in TI but influenced the standard deviation of ventilatory frequency (SDf) in PTI (p = 0.04). Age did not influence RV in PTI but SDf and the coefficient of variation of ventilatory frequency (CVf) decreased in TI from birth to 3 months. These data confirm sleep state as the predominant influence on RV in healthy term and convalescent preterm infants, with horizontal prone positioning having little effect when sleep state is controlled for. (C) 2010 Elsevier B.V. All rights reserved.
机构:
Tokyo Womens Med Univ, Dept Infants Brain & Cognit Dev, Shinjuku Ku, Tokyo 1628666, Japan
Tokyo Womens Med Univ, Dept Pediat, Tokyo 1628666, JapanTokyo Womens Med Univ, Dept Infants Brain & Cognit Dev, Shinjuku Ku, Tokyo 1628666, Japan
Shiraishi, Mika
Hirasawa, Kyoko
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Tokyo Womens Med Univ, Dept Pediat, Tokyo 1628666, JapanTokyo Womens Med Univ, Dept Infants Brain & Cognit Dev, Shinjuku Ku, Tokyo 1628666, Japan
Hirasawa, Kyoko
Shimizu, Satoru
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Tokyo Womens Med Univ, Dept Hyg & Publ Hlth 2, Tokyo 1628666, JapanTokyo Womens Med Univ, Dept Infants Brain & Cognit Dev, Shinjuku Ku, Tokyo 1628666, Japan
Shimizu, Satoru
Nishida, Hiroshi
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Tokyo Womens Med Univ, Maternal & Neonatal Ctr, Tokyo 1628666, JapanTokyo Womens Med Univ, Dept Infants Brain & Cognit Dev, Shinjuku Ku, Tokyo 1628666, Japan
Nishida, Hiroshi
Osawa, Makiko
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Tokyo Womens Med Univ, Dept Pediat, Tokyo 1628666, JapanTokyo Womens Med Univ, Dept Infants Brain & Cognit Dev, Shinjuku Ku, Tokyo 1628666, Japan