Urodynamics is a functional investigation of the lower urinary tract. It uses pressure monitors to help us determine how your bladder fills, stores and empties.
Prior to the procedure
You do not need to have a full bladder or be “nil by mouth” prior to Urodynamics. Please allow at least 3 hours from the time that you arrive.
When you arrive at the hospital a nurse will give you an oral antibiotic; this is for protection against infections. Even though infection risk is very low, it is common practice to give “prophylactic “antibiotics.
You will have a numbing agent (lignocaine gel) inserted into the urethra. This will prevent discomfort upon insertion of the tubes.
1) The investigations will start with a Cystoscopy. This involves a scope with a camera and light source being inserted into your urethra which travels up into your bladder. You will be able to see what the Urologist sees on a screen. Whilst this is being performed your bladder will be filled up with fluid.
2) Now that your bladder is full you will be asked to empty your bladder into a special device called Uroflowmetre. This measures the flow rate (ml/sec) and the volume of urine output.
3) Now it is time for cystometry. This is a way of investigating the bladder functions, measured by bladder pressure monitors during filling and emptying of the bladder.
Two catheters are inserted.
(a) Rectal catheter inserted into the rectum – this is the transducer that measures abdominal pressure (b) Bladder catheter is inserted the same way the scope was via the urethra into the bladder – this has two parts one for filling the bladder and the other is the transducer for measuring bladder pressures.
4) Filling the bladder: This is done slowly at a rate of 50mls/min (natural filling is around 10mls/min). The solution used is 0.9% Sodium Chloride (salty water).
At this stage we ask you to let us know what you are feeling;
(a) When you feel the sensation of filling
(b) When you feel you would normally go to the toilet
(c) When you can’t hold on any longer or “busting”
5) Emptying your bladder: Once your bladder is full the filling tube will be removed, leaving two transducer catheters in, one in your rectum and one in your bladder. With this in mind, you will be carefully taken over to the Uroflowmetre for you to empty your bladder. Once you have finished voiding, we take all tubes out and the procedure is complete.
NB: At various times throughout the procedure you will be asked to cough, this is to ensure the transducer catheters remain in their correct position.
After your procedure Dr Chong will discuss the results and a plan of care. It is always a good idea for you to have someone accompany you at this stage.
You may experience a small amount of blood and/or feel burning when you next void. Usually these symptoms are of short duration (24-48 hours) however, it has been known to last longer.