Dall F H, Jørgensen C S, Djurhuus J C, Gregersen H
Institute of Experimental Clinical Research, University of Aarhus, Denmark.
Dig Dis. 1991;9(6):347-53. doi: 10.1159/000171322.
The aim was to investigate biomechanical wall properties of the porcine rectum by way of manometry and impedance planimetry. Distension of a balloon inserted into the rectum with definite pressure steps up to 80 cm H2O was done for simultaneous recording of pressure and the balloon cross-sectional area (Bcsa). Viscoelastic wall properties were derived in terms of compliance. Besides eliciting the ascending peristaltic reflex and relaxation of the internal anal sphincter, the balloon inflation elicited a phase of rapid Bcsa increase followed by an accommodation phase of slow Bcsa increase to a steady-state Bcsa, reached within 3 min. The Bcsa increased in a nonlinear way with increasing balloon pressures with only a minimal increase from 70 to 80 cm H2O. Rectal compliance decreased in a nonlinear way with increasing distension pressure.
目的是通过测压法和阻抗平面测量法研究猪直肠的生物力学壁特性。将一个气球插入直肠，以高达80 cm H₂O的确定压力步长进行扩张，同时记录压力和气球横截面积（Bcsa）。根据顺应性得出粘弹性壁特性。除了引发升结肠蠕动反射和肛门内括约肌松弛外，气球充气还引发了Bcsa快速增加的阶段，随后是Bcsa缓慢增加至稳态Bcsa的适应阶段，在3分钟内达到。随着气球压力增加，Bcsa呈非线性增加，从70 cm H₂O到80 cm H₂O仅略有增加。直肠顺应性随着扩张压力增加呈非线性下降。
