Cystometric study
Alternative names:
CMG; cystometrogram
How the test is performed:
You are asked to void (urinate). The time required to begin voiding and the size, force, and continuity of the urinary stream is recorded. The amount of urine, how long the voiding took, and the presence of straining, hesitancy, and dribbling are also recorded.
You are then asked to lie down. A catheter (a thin, flexible tube) is gently positioned in the bladder, and any urine left in the bladder is measured and recorded. Next, the thermal sensation is evaluated. Room temperature saline solution is instilled into the bladder, followed by warm water. You need to tell the health care provider what, if any, sensations are felt. The water is then drained from the bladder. A cystometer (a tube used to monitor bladder pressure) is connected to the catheter. Water or carbon dioxide gas is slowly introduced into the bladder at a controlled rate. You will need to tell when the need to void is felt. The pressures and volumes are recorded. When the bladder is full, you must void, and the pressure of the voiding is recorded. The bladder is again drained of any residual urine and the catheter is then removed.
How to prepare for the test:
Adult:
No special preparations are necessary for this test.
Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:
How the test will feel:
There is some discomfort. One may experience pain, flushing, sweating, nausea, bladder filling, and an urgency to void.
Why the test is performed:
The test is performed to help determine the cause of bladder dysfunction.
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