Cystometrogram

1. What is measured during cystometry?
2. What sensations are measured during cystometry?
3. What is the accepted normal bladder capacity?
4. In a spinal cord injured patient, what should the volumes of the bladder be maintained below? What occurs if volumes are too high?
5. What are urodynamic studies performed to assess?

Answers:
1. Sensation, capacity, and presence of involuntary detrusor activity.
2. First sensation of bladder filling (100-200cc), bladder fullness (300-400cc), and urgency (400-500cc).
3. 300-600cc.
4. Volume should be maintained below 400-500cc. If higher, this can result in vesicoureteral reflux, overflow incontinence, and hydro-ureter.
5. The bladder neck, the external sphincter, and the detrusor.