Telford R J, Hollway T E
Department of Anaesthetics, Atkinson Morley's Hospital, London.
Anaesthesia. 1991 Sep;46(9):725-7. doi: 10.1111/j.1365-2044.1991.tb09765.x.
Pressure recordings were made during passage of a Tuohy needle from the interspinous ligament to the subarachnoid space for lumbar drain insertion. Epidural space pressures were always positive. Negative pressures were seen only at the moment of entry into the subarachnoid space. These were artefactual and were caused by tenting of the dura by the blunt Tuohy needle. Use of a closed measurement system such as this facilitates the development of large transdural pressure gradients because of the inability of the epidural space pressure to equilibrate with atmospheric pressure. This may contribute to ease of dural puncture.
在插入腰椎引流管时，从棘间韧带至蛛网膜下腔置入Tuohy针的过程中进行了压力记录。硬膜外间隙压力始终为正。仅在进入蛛网膜下腔的瞬间出现负压。这些负压是人为造成的，是由钝头Tuohy针对硬脑膜的牵拉所致。使用这样的封闭测量系统会因硬膜外间隙压力无法与大气压平衡而促使形成较大的跨硬膜压力梯度。这可能有助于硬膜穿刺的顺利进行。
