Bader D, Tirosh E, Hodgins H, Abend M, Cohen A
Neonatal Department, Bnai-Zion Medical Center, Faculty of Medicine, Haifa, Israel.
J Perinatol. 1998 Jan-Feb;18(1):5-8.
This study was done to evaluate the effect of an increase in environmental temperature in healthy infants on breathing patterns during sleep.
Ten preterm infants (mean gestational age 30.6 [SD 1.5] weeks) who reached maturity and 10 term comparison infants underwent polysomnographic studies before, during, and after exposure to raised environmental temperature. Core temperature and instances of central and obstructive apnea during active sleep and quiet sleep were recorded and compared between and within the two groups.
At environmental temperatures between 29 degrees and 30 degrees C, both groups of infants had longer and more frequent apneic episodes than at 24 degrees C. Compared with baseline findings, in preterm infants at a postconceptional age of 38 (SD 1) weeks, the apnea index increased during quiet sleep, whereas in term infants aged 36 to 72 hours (similar postconceptional age), an increased index was observed during active sleep.
A mild increase in environmental temperature has an effect on breathing patterns in both preterm (even when they have reached maturity) and term infants. However, a different response related to sleep state was observed in the two groups. We speculate that these effects may play a role in the association between a life-threatening event and elevated environmental temperature in both groups of infants.
本研究旨在评估环境温度升高对健康婴儿睡眠期间呼吸模式的影响。
10名达到足月的早产婴儿（平均胎龄30.6[标准差1.5]周）和10名足月儿对照婴儿在暴露于升高的环境温度之前、期间和之后接受了多导睡眠图研究。记录并比较两组婴儿在主动睡眠和安静睡眠期间的核心温度以及中枢性和阻塞性呼吸暂停的情况。
在环境温度为29摄氏度至30摄氏度时，两组婴儿的呼吸暂停发作时间比在24摄氏度时更长且更频繁。与基线结果相比，在孕龄38（标准差1）周的早产婴儿中，安静睡眠期间呼吸暂停指数增加，而在出生36至72小时（孕龄相似）的足月儿中，主动睡眠期间呼吸暂停指数增加。
环境温度轻度升高对早产婴儿（即使他们已达到足月）和足月儿的呼吸模式均有影响。然而，两组婴儿观察到与睡眠状态相关的不同反应。我们推测这些影响可能在两组婴儿危及生命事件与环境温度升高之间的关联中起作用。
