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N AN EARLIER REPORT we have described a method for recording electropotential changes in the human urinary bladder, together with the bioelectric characteristics frequency of spontaneous vesical activity as recorded by this technique (2). The present study was undertaken for the purpose of securing synchronous records of both potential pressure variations within the viscus in order that the major typical potential shifts which we have tentatively designated as the âAâ âBâ deflections (fig. IA) might be better understood in terms of bladder function, an obvious advantage in the clinical use of the method. METHODS Synchronous records of potential pressure variations were secured by means of a special urethral sound2 containing passages not only for the electrodes as previously described but, in addition, an open channel for the transmission of intravesical pressure as well. The lumen of this channel was connected through relatively inelastic plastic tubing to a Statham strain gaugeâ having a linear sensitivity of o to 50 mm. Hg, so that pressure changes could be recorded through a control unit in conjunction with a Grass electroencephalograph, suitably filtered. The fluid content of the bladder was varied at will through a three-way stopcock incorporated in the system, it
Journal of Applied Physiology – The American Physiological Society
Published: Jul 1, 1952
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