Parameters of detrusor contractility: I: The effects of electrical stimulation, hysteresis, and bladder volume in an in vitro whole rabbit bladder model

Neurourology and Urodynamics - Tập 10 Số 1 - Trang 53-59 - 1991
Steven A. Kaplan1, Jerry G. Blaivas1, W. Duane Brown1, Robert M. Levin2
1Department of Urology, Columbia University College of Physicians and Surgeons, New York, New York
2Division of Urology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania

Tóm tắt

AbstractThis study represents the first of a five phase project which was designed to develop parameters to assess detrusor contractility and urethral obstruction. The first phase was designed to (1) determine the optimal volume at which to measure various parameters of detrusor contractility and (2) determine the effects of hysteresis on isovolumetric detrusor pressure (Piso). To this end, the bladders of five male white New Zealand rabbits were isolated and placed in a bath chamber. Intravesical pressure and the weight of the voided urine were monitored by a pressure transducer and electronic balance, respectively. Bladder capacity ranged between 41 ml and 53 ml (mean 47 ± 2.34). In the first phase of this experiment, Piso was determined at 1, 2.5, 5, 10, and 20 ml. Piso was always found at a volume of 2.5 ml (20.7 ± 2.86). There was a 13% decrease in Piso at 1 and 5 ml, a 35% decrease at 10 ml, and a 49% decrease at 20 ml. This was significant at P < 0.05.In the second part of the experiment, the effect of different methods of filling on the magnitude of subsequent isometric contractions was examined. It was found that preceding strain (hysteresis) had no effect on subsequent contractions. In addition, the average Piso for each volume remained the same regardless of the method of filling.In conclusion, these data suggest that the effect of hysteresis and method of bladder filling on Piso was negligible. In addition, as one would expect from the geometric configuration of the bladder, maximum detrusor pressure occurred at relatively low bladder volumes, i.e., less than 5% capacity. Further research is in progress to determine which parameters are important in delineating and predicting bladder performance.

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Tài liệu tham khảo

10.1016/S0022-5347(17)40634-3

10.1002/nau.1930040403

10.1111/j.1464-410X.1977.tb04518.x

Griffiths DJ, 1980, Urodynamics: the mechanics and hydrodynamics of the lower urinary tract

10.1002/nau.1930040203

Griffiths DJ, 1986, Urinary bladder function and its control in healthy females, Am J Physiol, 251, 2R225

10.1002/nau.1930080104

10.1016/0002-8703(83)90451-9

10.1016/S0022-5347(17)53350-9

10.1016/S0022-5347(17)47183-7

10.1007/978-1-4612-5476-8_43

10.1111/j.1748-1716.1980.tb06681.x

van Mastrigt R, 1986, Modeling the contractility of the urinary bladder smooth muscle using isometric contractions, Am J Physiol, 251, R978

van Mastrigt R, 1988, Urethral resistance and urinary bladder contractility before and after transurethral resection as determined by the computer program CLIM, Neurourol Urodynam, 7, 226

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Neurourology and Urodynamics

Tập 10 Số 1

53-59

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