Urodynamics
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Urodynamics is the investigation of functional disorders of the lower urinary tract, i.e. the bladder and the urethra. Symptoms are particularly unreliable in the study of the lower urinary tract, so the purpose of urodynamics is to confirm objectively the pathology that a person's symptoms would suggest.
So for example if a person complains of a high frequency of urination it might be because of detrusor overactivity. Urodynamics would involve the use of pressure transducers attached to catheters inside the bladder and rectum to verify such a pressure pattern.
Detrusor overactivity is characterised by the phasic pressure contractions seen in the image on the right. This is not a normal finding. The normal bladder should be low pressure during filling.
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