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Did your urodynamic study constituted uroflometry or/and cystometrography? Did they do ultrasound? What were the other investigations done? Did he do a digital rectal examination?
Yes, this does. One more question before we proceed to answer; did they ask you to urinate in a commode which was connected to a computer and which gives various urine flow studies? Before the test they ask you to full your bladder naturally.
This can be Bladder neck dysfunction which is defined as an incomplete opening of the bladder neck during voluntary or involuntary voiding. This can be because of;
1) smooth sphincter dyssynergia,
2) proximal urethral obstruction,
3) primary bladder neck obstruction, and
4) dysfunctional bladder neck.
Evidence of outlet obstruction is easily obtainable by urodynamic study. Once obstruction is diagnosed, it can be localized at the level of the bladder neck by
a) video-urodynamic study, (you have got this although it was not a video)
2) cystourethrography during a bladder contraction, or micturitional urethral profilometry (you need to get it done).
The treatment would entail;
1) Alpha adrenergic blocking agent
2) Bladder neck incision (this would be done by cystoscopy).
Please feel free for your follow up questions.
I understand this is quite a medical jargon. I am sorry for this but all these, as you may understand, are difficult to give the simpler terms. You have correctly mentioned that bladder capacity is around 400-500 ml. But an ultrasound initially showed complete emptying of the bladder 10 days ago. Sometimes, when one is lying down, bladder neck dysfunction becomes more prominent, especially when one uses the abdominal muscles.
A urinating flow study (cystourethrography during a bladder contraction, or micturitional urethral profilometry) usually will able to identify the obstruction of the outflow. Bladder walls are quite elastic so they won't explode. Please don't worry about it. Most people, once started with the medications or after getting the bladder neck incision (a minor procedure) often note afterward that they have "never" voided as well. The combination of the studies I mentioned are able to identify the nerve dysfunctions and abnormalities. An MRI of the lower spine will sometimes needed, if any neurological problem is associated. The calcium intake is not associated with it. Although a spondylolisthesis, if severe, and depending on its level, needs to be evaluated by MRI, as I have already mentioned.
Please feel free, if you have further queries.