Bladder Pressure

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Magna - 17 Jan 2004 09:45 GMT

Recently had cystometrogram (urodynamics). My uro had already
diagnosed mild/moderate bph. Result of cysto was "high pressure
detrusor contractions typical of detrusor over activity" Uro said
surgery or flomax+detrusitol or do nothing and see what happens.The
symptoms would probably wax and wane with time.

Back to GP who gave me a copy of the report.

Does anybody know if these figures are low/med or high? Uro didn't
disscuss them (as usual seemed short of time)

Max bladder pressure 65cmH2O
Pressure at void begin 48cmH2O
Pressure at max flow 45cmH2O
Compliance 38.9ml/cmH2O

Not sure I understand what the compliance figure means.

Richard, I know you mentioned bladder pressure in a recent thread, do
you have any comment??

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Dubinse - 17 Jan 2004 19:56 GMT

>Compliance 38.9ml/cmH2O
>
>Not sure I understand what the compliance figure means.

Compliance is a kind of volume elasticity.
If the pressure volume curve of your
bladder were linear (which it probably is
not) for every increase of ~39 ml of urine
introduced, the pressure woould rise by
1 CmH20. Although ml is a fairly common
unit of measurement, CmH20 is not. There
are lots of pressure units like pounds per
square inch, mm Hg, Newtons per square
meter. If I don't have tables of conversion
I try to figure that mercury is 13.5 times as
heavy as water so 1 Cm H20 = 10 mm Hg
= 10/13.6 mm Hg. Then I recall that one
atmosphere is avout 760 mm Hg and also
aboout 34 psi. Then I call my son who is a
math genius.

In respiratory mechanics there is also use
of the term complaince and it's inverse is
called elastance.
Stephen Dubin VMD

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