What is normal intravesical pressure?
The contraction of the detrusor muscle results in an intravesical pressure or driving force of some 20 to 60 cm of water in the normal male, and rather less in the female, and this pressure is maintained until voiding is completed.
What is high pressure voiding?
A finding of a high voiding detrusor pressure with a low flow rate indicates bladder outlet obstruction. Lastly, in patients with neurogenic bladder dysfunction, the detrusor leak point pressure is used to assess the risk of upper urinary tract damage.
What is urethral pressure profilometry?
Urethral pressure profilometry (UPP) is used in the diagnosis of stress urinary incontinence (SUI). In order to perform UPP, a measurement catheter is pulled slowly, by a defined distance/time through the urethra thus obtaining a pressure profile along the inside of the urethra.
What is the normal urine flow rate in Male?
Table 4
| Male population | Maximum flow rate | Average flow rate |
|---|---|---|
| 16-50 years old | 22.8 ml/sec | 13.22ml/sec |
| >50 year | 17.04 ml/sec | 8.9ml/sec |
| Female population | Maximum flow rate | Average flow rate |
| Pre-menopausal | 21.8 ml/sec | 12 ml/sec |
How is detrusor leak point pressure measured?
To measure ALPP, filling is stopped and the patient is asked to increase their intra-abdominal pressure by coughing, or by blowing into a syringe (Valsalva manoeuvre), until the patient leaks and the lowest pressure at which this happens is recorded as the ALPP.
What is the intravesical ureter?
There are two portions of ureter: The part outside the bladder muscle is known as the juxtavesical portion while inside is known as the intravesical portion. At birth, the intravesical ureter is 0.5 cm in length while in adulthood it is 1.5 to 2.6 cm.
How do you measure urethral pressure?
Current techniques for measuring urethral pressures include microtip transducers, water-perfused side-hole catheters, urethral pressure reflectometry, and air-charged balloons on semi-rigid catheters(4–7).
How is bladder compliance measured?
Compliance is calculated by dividing the volume change by the change in detrusor pressure during that change in bladder volume (units mL/cm H2O).
How do you increase intravesical pressure without changing volume?
We reasoned that increasing the intravesical pressure without changing volume would give us the answer. We did that, simply by having a fixed volume in the bladder, making the bladder contract, raising the intravesical pressure almost to the voiding pressure, and at the same time recording the resistance to flow ( Fig. 3).
What is the normal range of intravesical pressure during bladder filling?
Close to bladder filling (vertical arrow), intravesical pressure was about 25 mm Hg, and resistance to flow was about 75 mm Hg; during voiding, intravenous pyelogram was about 50 mm Hg, and resistance to flow was about 175 mm Hg.
What is the relationship between intravesical pressure and resistance to flow?
This resistance to flow is not related to the intravesical pressure itself. When voiding ends, the intravesical pressure drops appreciably, but resistance to flow lags, because the trigone and ureter relax separately from the detrusor muscle; when the trigone has relaxed completely, the resistance to flow returns to the baseline.
What is the Normal voiding phase of the urinary system?
The normal voiding phase is cha- racterized by the voluntary initiation of micturition fol- lowed by forceful and continuous flow with no residual urine. Coordinated relaxation of pelvic floor and exter- nal urethral sphincter as well as detrusor contraction contribute to the efficient emptying of the bladder.