Difficult to say and Urology is absolutely not my subject (funny enough I am writing this in my urologist’s waiting room), but a few things to consider:

• Unlike normal urinary retention his ureter will be heavily inflamed. That can also include the Urethra(to a far lesser extent than the ureter,though) and might at some point even inflame the prostata. This makes regular catheters really uncomfortable and also hard to get in. So… there is that.

• Additionally frequent single use catheterization into an inflamed tissue increases the risk of infection. Additionally the user needs to keep strict hygienic standards…which addicts often can’t follow. So either he has someone doing that for him or the perspective is rather uncanny. Even with that his erectile function might be impeded.

• On the other hand a permanent catheter had its own drawbacks and I am not sure if he would accept one. Because that would mean no more children (at least not the normal way), having the bag attached permanently,etc.

• The other option is a so called suprapubic catheter - a small surgical hole above the pubic bone with a permanent catheter placed in it. Also a nasty thing in terms of germ ingress.

Last but not least: The catheter will solve the “urine in the bladder” issue,but not the kidney issues as the backup there to a certain degree happens above the bladder - inside the ureter. It can be mitigated by putting a ureteral stent in them,but these are mighty uncomfortable and need to be replaced every few months - via endoscope. Through his dick.

So in the end: Don’t do Ketamine,guys.