Urodynamics Flashcards
What is PVR?
the volume of urine left in the bladder at the completion of micturition
What is uroflowmetry?
the measurement of the rate of urine flow over time
What is electromyography?
the electronic potentials produced by the depolarization of muscle membranes. In most UDS tests, EMG measurement of the striated sphincteric muscles of the perineum is done to evaluate possible abnormalities of perineal muscle function that are often associated with lower urinary tract symptoms and dysfunction.
What are pressure flow studies?
measure the relationship between pressure in the bladder and urine flow rate during bladder emptying.
What are videourodynamic studies?
include the addition of simultaneous imaging (usually fluoroscopy) during cystometry and/or PFS.
What is abdominal/valsalva leak point pressure?
measurement of urethral function or outlet competence and is the intravesical pressure at which urine leakage occurs due to increased abdominal pressure in the absence of a detrusor contraction.
What is a urethral pressure profile?
Continuous measurement of the fluid pressure needed to just open a closed urethra.
What is maximum urethral closure pressure?
the maximum difference between the urethral pressure and the intravesical pressure.
What parameters are most important for evaluating stress urinary incontinence?
CLPP
VLPP/ALPP
MUCP
PVR
Indications for UDS?
SUI considering surgery
Urgency considering intervention
Suspected NGB
LUTS considering intervention
Patient suspected of SUI does not demonstrate this on initial test. What should be tried next?
The urethral catheter should be removed. 50% will show SUI after catheter is removed.
A women with POP is undergoing UDS for SUI. What should be done first?
The prolapse should be reduced.
A patient has urgency incontinence after a procedure for SUI. What is the next step?
UDS to evaluate PFS looking for signs of bladder outlet obstruction.
A patient with urge incontinence does not illustrate DO on their UDS. What is the next step?
The patient should be counseled that this does not exclude DO as the cause.
What should evaluation of a neurogenic bladder include?
PVR CMG PFS VUDS EMG
