The Voiding Audiograph: A New Voiding Test

Keitzer, Walter A.; Huffman, Gene C.

doi:10.1016/s0022-5347(17)63280-4

Cited by 20 publications

(8 citation statements)

References 3 publications

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“…A major advantage of such a diagnostic method is simplicity. The development of this non‐invasive technique for diagnosing lower urinary tract symptoms started in the mid‐1960s with a voiding audiograph 20 . It was hypothesized that urinary flow is turbulent at the bladder neck.…”

Section: Perineal Noise Recordingmentioning

confidence: 99%

The future of urodynamics: Non‐invasive ultrasound videourodynamics

et al. 2010

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A totally non-invasive transperineal urodynamic technique using Doppler ultrasonography has been developed. Normal urine doesn't have blood cells so urine was thought not to produce Doppler effects. However, basic studies confirmed that the decrease of pressure at high velocity (Bernoulli effects) caused dissolved gas to form microbubbles, which are detected by Doppler ultrasonography. Subjects sat and a probe was advanced via remote control to achieve gentle contact with the perineal skin. The digital uroflow data signals and the color Doppler ultrasound video images were processed on a personal computer. This method was viable to diagnose the degree of bladder outlet obstruction. The advantage of being rapid , effective, and equipped with no special attachments allows it to surpass any other non-invasive urodynamic methods. The difference between the echocardiogram and the ultrasound urodynamic system is only the frequency of obtaining velocity information: more than 50 times per minute vs once every several hours, respectively. Although the ultrasound urodynamic system is more difficult to develop than the echocardiogram, one principle is shared by both methods. The patient can void freely without interruptions, there is no contact between the penis and the equipment and it is specifically directed toward non-invasive diagnosis. The development of non-invasive Doppler ultrasound videourodynamics will dramatically expand understanding of voiding function.

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Section: Perineal Noise Recordingmentioning

confidence: 99%

The future of urodynamics: Non‐invasive ultrasound videourodynamics

et al. 2010

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“…[6] It was thought that the splashing sound of urine voided in a cup, recorded using a microphone and corrected for the voided volume, was a measure for bladder pressure. One decade later, the microphone was moved from the cup to the body at the level of the perineum and the sound produced in the urethra was recorded simultaneously with the flow rate.…”

Section: Methods (1)mentioning

confidence: 99%

Perineal sound recording for diagnosis of bladder outlet obstruction

2009

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Objectives:Elderly men are prone to developing lower urinary tract symptoms (LUTS) possibly caused by bladder outlet obstruction (BOO). The most frequently used method to diagnose this condition is an invasive and time-consuming pressure-flow study. We are developing a novel non-invasive method to diagnose BOO in men with LUTS based on perineal sound recording.Methods:A biophysical model urethra was made from polyvinyl alcohol (PVA) cryogel with viscoelastic properties comparable to those of the male pig urethra. To this model different degrees of obstruction were applied and sound was recorded at different positions downstream of the obstruction. In a study in 16 healthy male volunteers the variability and repeatability of perineal sound recording was tested.Results:In the model three parameters, derived from the frequency spectrum of the recorded sound (i.e., weighted average frequency, standard deviation and skewness) are uniquely related to the degree of obstruction (linear regression, P<0.001). The variability of perineal sound recording in healthy male volunteers was found to be smaller within volunteers than between volunteers (Kruskal-Wallis, P<0.001) and the repeatability was comparable to that of the maximum flow rate.Conclusions:We conclude that perineal sound recordings are significantly different between volunteers. In combination with the unique relations found in the model-experiments these results increase the probability that perineal sound recording can be used as a simple and cheap non-invasive method to diagnose BOO. Clinical testing of this method is therefore strongly indicated.

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“…The development of this technique started in the mid-1960s with a voiding audiograph 9 and it has been applied in two clinical urophonographic studies. 10,11 The general conclusion from these two studies was that pressure variations at the urethral wall could be measured in the form of audible sound, both in a model as well as in patients.…”

Section: Introductionmentioning

confidence: 99%