Naidoo M, Colditz P B, Browne C A, Dunster K R
Perinatal Research Centre, University of Queensland, Royal Women's Hospital, Brisbane, Australia.
J Paediatr Child Health. 2000 Oct;36(5):462-5. doi: 10.1046/j.1440-1754.2000.00542.x.
To evaluate whether cardiac responses to a level of hypoxic hypercapnia that may be observed in rebreathing studies are altered with infant sleep position.
Eighteen healthy term infants (< 5-days-old) were studied. Heart rate (HR) and HR variability were monitored during air breathing and during 3 min exposure to a mixture of 15% O2/3% CO2 in both the prone and supine positions. Power spectral analysis of HR was performed.
Heart rate was the only measured variable to be significantly changed in response to 15% O2/3% CO2. Hypoxic hypercapnia elicited no significant responses in power spectral HR variables. There was no effect of sleeping position on any of the measured variables.
There are no significant differences in cardiac responses to mild hypoxic hypercapnia between sleep positions and power spectral indices of the autonomic control of HR are not altered by sleep position in newborn babies.
评估在重复呼吸研究中可能观察到的一定程度的低氧高碳酸血症下心脏反应是否会因婴儿睡眠姿势而改变。
对18名健康足月儿（小于5日龄）进行研究。在仰卧位和俯卧位时，分别监测婴儿在空气呼吸期间以及暴露于15%氧气/3%二氧化碳混合气体3分钟期间的心率（HR）和心率变异性。对心率进行功率谱分析。
心率是唯一因15%氧气/3%二氧化碳而发生显著变化的测量变量。低氧高碳酸血症对心率功率谱变量未引起显著反应。睡眠姿势对任何测量变量均无影响。
睡眠姿势之间对轻度低氧高碳酸血症的心脏反应无显著差异，且新生儿的心率自主控制的功率谱指标不会因睡眠姿势而改变。
