Visco-EIastic Properties of the Bladder Wall

Abstract

Stepwise cystometry is a new method proposed to analyse the visco-elastic properties of the bladder. It is based on a mathematical analysis of the pressure decay after a stepwise filling. By assumption of a mechanical visco-elastic model of bladder tissue and a model of the geometry, the derived parameters are interpreted as elasticity and viscosity moduli. Static cystometry is involved in this new procedure. From analysis by stepwise cystometry it is concluded that static cystometry attained by following a slow-filling procedure is unacceptable in studying elastic behaviour.

Mechanical properties of mammalian single smooth muscle cells III. Passive properties of pig detrusor and human a terme uterus cells

“…In intact bladder muscle, and in bladder strips, the effects of stretch activated cell depolarization leading to force increases by cross-bridge cycling, were observed approximately 40--60 s after rapidly stretching the muscle (Levin et al, 1986;Van Mastrigt, 1977). The resulting wave-like superimposed force increments on the relaxation curve did not affect the general form of the relaxation curve to a significant degree (Coolsaet, 1975b). In this study only bladder cells 2 and 3 showed superimposed force waves of such a magnitude (approximately 2-3 #N peak to peak) that this behaviour was reflected in the results of Tables I and 4.…”

Variation of Passive Mechanical Properties of the Ureter along Its Length

“…The ureters were cut into eight segments of equal length. During the experiments they were submerged in a modified Krebs solution [4] which was aerated and kept at 37 °C. The segments were mounted in a specially made pneumatic straining device ( fig.…”

Elastic Properties of the Isolated Perfused Porcine Duodenum

“…Measurement of elastic wall properties is becoming increasingly important in studies of distensible organs such as blood vessels and the bladder [1,14,16], Stress-strain rela tions are a measure of these properties. In the duodenum, only very few studies have been done on isolated smooth muscle strips [9,10], The duodenal wall became stiffer when stretched.…”

“…To acquire knowledge on the function of hollow organs in physiological and pathological states, it is desirable to describe the elastic properties of the intact organ, as they may reflect the state of individual components underlying this function or malfunction. The elastic proper ties of the urinary tract and the major vessels have been studied extensively [1][2][3] and data on gastrointestinal elastic properties are emerging, but the majority from investiga tions done on isolated smooth muscle strips. In contrast, elastic properties of intact intes tinal segments have received little attention, mainly because no sufficiently accurate method existed to measure them.…”