Cox P
Department of Anaesthesia, Motala Hospital, Sweden.
Anaesthesia. 1988 Jan;43(1):33-6. doi: 10.1111/j.1365-2044.1988.tb05421.x.
Three currently available pressure infusor devices, based on three different principles, were tested to see if the pressure reading on the infusor manometer corresponds to the pressure generated in the infusion system. Each device was tested in two ways. First, the pressure generated in the infusion system was measured when the infusor bag pressure was maintained at 300 mmHg while the infusion bag was emptied in aliquots of 50 ml. Second, the pressures in the infusor bag required to maintain a pressure of 300 mmHg were measured as the infusion bag was emptied stepwise. The results reveal surprisingly large discrepancies between the pressure registered on the infusor manometer and the actual pressure generated in the fluid, which are not due to manometer inaccuracy. The degree of discrepancy depends on the amount of fluid that remains in the infusion bag and, when the infusor manometer shows a pressure of 300 mmHg, pressure in the fluid can be as much as 170 mmHg above or 200 mmHg below this value. Furthermore, it was impossible to maintain a pressure of 300 mmHg in the infusion system using one of the devices despite the fact that 100 ml fluid remained. The clinical significance of these findings is discussed.
基于三种不同原理的三种目前可用的压力输注装置，被进行测试以查看输注器压力计上的压力读数是否与输注系统中产生的压力相对应。每个装置通过两种方式进行测试。首先，当输注器袋压力维持在300 mmHg且输注袋以50 ml的等份排空时，测量输注系统中产生的压力。其次，随着输注袋逐步排空，测量维持300 mmHg压力所需的输注器袋中的压力。结果显示，输注器压力计上记录的压力与流体中实际产生的压力之间存在惊人的巨大差异，这并非由于压力计不准确所致。差异程度取决于输注袋中剩余的流体量，并且当输注器压力计显示300 mmHg的压力时，流体中的压力可能比该值高170 mmHg或低200 mmHg。此外，尽管还剩下100 ml流体，但使用其中一种装置无法在输注系统中维持300 mmHg的压力。讨论了这些发现的临床意义。
