Colinstone,
I don't believe the bladder shrinks per se, but may regain some of it's elasticity. The way it was explained to me is that the bladder muscle gets thicker from trying to expel the urine against the resistance of whatever is stopping the stream, usually an enlarged prostate squeezing the urethra (like someone stepping on a hose) or possibly stones blocking the
opening of the bladder, or a tight bladder mouth (also called the external sphincter) which doesn't
open all the way to let the urine out. This thicker bladder muscle causes the bladder to have a lower capacity, which causes you to feel like urinating more often. I think my threshold was about
300ml. before I had to go. When I was retaining 200ml. or more, that was every 40 minutes around the clock as the body produces about
100ml per hour of urine. With my capacity, I needed to get down to about
50ml. post void residual to be able to last a couple of hours.
Basically you can take the tamsulosin as long as it works and you feel you can tolerate any side effects. For some that is months and for others it is years. You probably ought to get another ultrasound to see what you are retaining now as 300ml is quite a bit. Be sure you void completely (best to double void if you can) before taking the test. Your overall bladder capacity must be pretty good if you can make it through the night with voiding just once or not at all. You have a relatively small prostate, but they say that is not the deciding factor as small prostates can cause problems and big ones can have no symptoms at all. As long as your PSA tests don't have dramatic increases it sounds like except for the amount you are retaining you are doing pretty well. What does your urologist think is the cause? It seems tamsulosin is the first step most urologists take, then work from there. Has he looked inside your bladder with a cystoscope? Mine did and got a good picture of what was going on, though every time I have had a cystoscope I have gotten a urinary tract infection.
A relative of mine had a severely stretched bladder that was no longer able to contract at all, and he has no sensation of needing to urinate, so must self cath every 6 hours. But it doesn't sound like this is your case.
Bob
Post Edited (Bob_NJ) : 4/24/2014 10:52:08 PM (GMT-6)