Hunt C E, Brouillette R T, Liu K, Klemka L
Pediatr Res. 1985 Feb;19(2):174-7. doi: 10.1203/00006450-198502000-00005.
To determine day-to-day variability in respiratory pattern, we obtained 188 comparisons of pneumograms performed during two successive 24-h intervals. The respiratory pattern values calculated were total duration of brief apnea (apnea density), periodic breathing episodes, longest apnea, number of apneas greater than 11 s, and number of apneas greater than 15 s. For day 1 values for apnea density, periodic breathing, and longest apnea which were within the 90th percentile for normal infants at age 1 month, day 2 values fell outside that range in 4.3, 3.5, and 18% of comparisons, respectively. There was a systematic tendency for the day 2 values to be less than the day 1 values. For each parameter, the day 2 range was lower, the slope of the day 2 versus day 1 regression line was significantly less than 1 (p less than 0.01) and the y-intercept was significantly greater than zero (p less than 0.01). Knowledge of day-to-day pneumogram variability should be helpful in interpreting individual pneumogram results and in assessing the clinical usefulness of pneumogram recordings.
为了确定呼吸模式的每日变异性，我们在连续两个24小时时间段内对呼吸图进行了188次比较。计算得出的呼吸模式值包括短暂呼吸暂停的总时长（呼吸暂停密度）、周期性呼吸发作次数、最长呼吸暂停时长、持续时间超过11秒的呼吸暂停次数以及持续时间超过15秒的呼吸暂停次数。对于第1天呼吸暂停密度、周期性呼吸和最长呼吸暂停的数值，若处于1个月大正常婴儿的第90百分位数范围内，那么在第2天，分别有4.3%、3.5%和18%的比较结果超出了该范围。第2天的数值有系统地倾向于低于第1天的数值。对于每个参数，第2天的范围更低，第2天与第1天回归线的斜率显著小于1（p<0.01），且y轴截距显著大于零（p<0.01）。了解呼吸图的每日变异性应有助于解释个体呼吸图结果以及评估呼吸图记录的临床实用性。
