Stevens V, Wilson A J, Southall D P, Barber D C, Franks C I
Pediatr Res. 1985 Dec;19(12):1327-32. doi: 10.1203/00006450-198512000-00025.
From a prospective study into the sudden infant death syndrome in which 24-h recordings of the ECG and respiratory waveform (abdominal wall movement) were made on a population of full-term infants, 22 recordings were obtained on 16 infants who subsequently suffered sudden infant death syndrome. The probability density function for the instantaneous heart rate and the breath to breath intervals and their randomly variabilities were calculated for these 22 recordings and for a control group of 324 infants randomly selected from the remainder of the population. A principal components analysis was then performed to classify the data and to make comparisons between infants. The infants in the analysis were divided into three postnatal age groups. No differences were found between the sudden infant death syndrome cases and the control group for the breath to breath intervals and its variability or for the instantaneous heart rate. Three sudden infant death syndrome cases lay outside the range of values for the heart rate variability at 6 wk of age.
在一项关于婴儿猝死综合征的前瞻性研究中，对一组足月儿进行了24小时心电图和呼吸波形（腹壁运动）记录。在16名随后发生婴儿猝死综合征的婴儿身上获得了22份记录。计算了这22份记录以及从其余人群中随机选取的324名婴儿组成的对照组的瞬时心率、呼吸间隔及其随机变异性的概率密度函数。然后进行主成分分析以对数据进行分类并在婴儿之间进行比较。分析中的婴儿被分为三个产后年龄组。在呼吸间隔及其变异性或瞬时心率方面，婴儿猝死综合征病例与对照组之间未发现差异。有3例婴儿猝死综合征病例超出了6周龄时心率变异性的值范围。
