urodynamics

Question 1

for whom do you do urodynamic studies

Answer 1

if conservative treatments have failed
and before surgery
for urinary incontinence
but only if:
- there is clinical suspicion of detrusor overactivity
- there is previous surgery for continence or prolapse (in this case it is also an indication in stress incontinence)

Question 2

difference between uroflowmetry and cystometry

Answer 2

uroflowmetry is non-invasive recording of urine flow max rate, pattern and volume
cystometry needs the 2 catheters in the bladder and one in the rectum or vagina (for abdominal pressure measurement)

Question 3

post void residual should be no more than…

Answer 3

100ml

Question 4

first desire to void should be felt at…

Answer 4

150 - 200ml

Question 5

strong desire to void should be felt at…

Answer 5

350ml

Question 6

bladder capacity is…

Answer 6

400 - 600ml

Question 7

P.detrusor rise should not be more than… in the filling phase
and … in the voiding phase

Answer 7

max 15cm.H2O in the filling phase
max 70cm.H2O in the voiding phase

Question 8

peak flow rate should be … for a volume of …

Answer 8

> 15ml/sec
for a volume of >150ml

Question 9

when would you do ambulatory or video urodynamics

Answer 9

if the diagnosis is still unclear with conventional urodynamic studies