Power I, Thorburn J
University Department of Anaesthetics, Royal Infirmary, Edinburgh.
Anaesthesia. 1988 Oct;43(10):876-8. doi: 10.1111/j.1365-2044.1988.tb05605.x.
The pressures used in vivo to administer epidural doses of local anaesthetic were recorded for 16- and 18-gauge multihole catheters. Observations were made on 10 patients in labour for each catheter gauge. The pressure range for the 16-gauge catheters was 39.9-266 kPa, with a mean of 167.2 kPa, and for 18-gauge, a range of 53.2-266 kPa, mean, 159 kPa. Similar pressures were then applied in vitro to 10 catheters of each gauge, and the flow of fluid observed from the three holes. For each size of catheter, with increasing pressure, flow appeared at the proximal, then the middle, and finally the distal hole. This emphasises that the effect of epidural doses can vary depending on the pressure of injection, especially if the catheter had been passed partially through the dura.
记录了使用16号和18号多孔导管在体内给予硬膜外剂量局部麻醉剂时的压力。对每种导管规格，观察了10例分娩期患者。16号导管的压力范围为39.9 - 266kPa，平均为167.2kPa；18号导管的压力范围为53.2 - 266kPa，平均为159kPa。然后对每种规格的10根导管在体外施加类似压力，并观察从三个孔流出的液体。对于每种尺寸的导管，随着压力增加，液体先从近端孔流出，然后是中间孔，最后是远端孔。这强调了硬膜外剂量的效果可能因注射压力而异，尤其是当导管部分穿过硬脊膜时。
