Wilkes P R, Hoskin R W, Semlacher E A, MacCannell K L, Tyberg J V
Department of Medicine, University of Calgary, AB, Canada.
Can J Physiol Pharmacol. 1994 Sep;72(9):979-84. doi: 10.1139/y94-136.
Although the flow-through catheter (FTC) system has been useful and satisfactorily accurate for gastrointestinal manometry, we hypothesized that a cylindrical, liquid-filled balloon would also accurately reflect stress imposed by a sphincter. Latex balloons were fitted over the side ports of a closed-end catheter. The responses of the balloon and FTC system were compared in a cylindrical chamber commonly identified as a Starling resistor. Independent, constant-pressure sources were used to control both the inwardly directed "contact pressure" of the Starling resistor (Ps) and the intraluminal fluid pressure (P(lum)). The balloon transducers responded linearly and accurately (slope = 1) to changes in both Ps and P(lum) within the test range (0-200 mmHg, 0-26.7 kPa). When either P(lum) or Ps was held constant and the other changed, the balloon transducers always accurately measured the higher of the two pressures. Although the performance of the FTC system was improved after the Starling resistor was lubricated, the FTC system sometimes responded inaccurately to changes in Ps. The ability of the balloon transducers to measure the contractions of the lower esophageal sphincter and of the esophagus was demonstrated. We conclude that the balloon transducer can measure sphincter pressure accurately and suggest that, in certain circumstances, it might be advantageous relative to the FTC system.
尽管流通导管（FTC）系统在胃肠测压中一直很有用且准确性令人满意，但我们推测圆柱形的充液气球也能准确反映括约肌施加的压力。将乳胶气球安装在封闭端导管的侧孔上。在通常被称为斯塔林电阻器的圆柱形腔室中比较了气球和FTC系统的响应。使用独立的恒压源来控制斯塔林电阻器的向内“接触压力”（Ps）和腔内流体压力（P(lum)）。在测试范围内（0 - 200 mmHg，0 - 26.7 kPa），气球换能器对Ps和P(lum)的变化呈线性且准确的响应（斜率 = 1）。当P(lum)或Ps保持恒定而另一个发生变化时，气球换能器总是能准确测量两者中较高的压力。尽管在对斯塔林电阻器进行润滑后FTC系统的性能有所改善，但FTC系统有时对Ps的变化响应不准确。证明了气球换能器测量食管下括约肌和食管收缩的能力。我们得出结论，气球换能器可以准确测量括约肌压力，并表明在某些情况下，相对于FTC系统它可能具有优势。
