Royal Women's Hospital, Melbourne, Australia.
Acta Paediatr. 2011 Jan;100(1):67-70. doi: 10.1111/j.1651-2227.2010.01981.x. Epub 2010 Sep 6.
Ventilator frequency is one of the determinants of tidal volume delivery during high-frequency ventilation. Clinicians increasingly use data on ventilator displays to inform their decisions.
To measure the frequencies delivered by the Dräger Babylog 8000plus ventilator when used in high-frequency mode.
Ventilator waveforms using a test lung were recorded at the full range of settings 5-20 Hz using Spectra software at 1000 Hz. The changes in frequency produced by a 1-Hz change in set frequency were calculated. Actual and displayed frequencies were compared.
For settings up to 12 Hz, median (range) difference between set and delivered frequencies was 0 (-0.4 to +0.1) Hz. Above 12 Hz, delivered frequency varied by -0.3 (-1.9 to +0.3) Hz. For 1-Hz changes in frequency settings, in the range 5-12 Hz, 1-Hz changes produced a change in delivered frequency of 1.0 (0.6-1.4) Hz. Above 12 Hz, the corresponding changes were 0.7 (0-2.9) Hz. The ventilator displays the set frequency during operation rather than the delivered frequency.
At 12 Hz and below, the differences between set and delivered frequencies were relatively small compared with those at 13 Hz and higher. Above 13 Hz, the difference between set and delivered frequencies was up to 2.9 Hz. Some frequency setting changes did not result in a change in delivered frequency.
在高频通气中，呼吸机频率是潮气量输送的决定因素之一。临床医生越来越多地使用呼吸机显示屏上的数据来做出决策。
测量 Dräger Babylog 8000plus 呼吸机在高频模式下输送的频率。
使用测试肺，在 Spectra 软件以 1000 Hz 的频率下，在 5-20 Hz 的全设置范围内记录呼吸机波形。计算设置频率每增加 1 Hz 时产生的频率变化。比较实际频率和显示频率。
在设置高达 12 Hz 的情况下，设定频率和输送频率之间的中位数（范围）差异为 0（-0.4 至 +0.1）Hz。在 12 Hz 以上，输送频率变化为-0.3（-1.9 至 +0.3）Hz。对于频率设置的 1-Hz 变化，在 5-12 Hz 的范围内，1-Hz 的变化使输送频率变化 1.0（0.6-1.4）Hz。在 12 Hz 以上，相应的变化为 0.7（0-2.9）Hz。呼吸机在运行期间显示设定频率，而不是输送频率。
在 12 Hz 及以下，设定频率与输送频率之间的差异与 13 Hz 及更高频率相比相对较小。在 13 Hz 以上，设定频率与输送频率之间的差异高达 2.9 Hz。一些频率设置变化不会导致输送频率的变化。
