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Why are you on a long term catheter?
Do you have a fever?
Are you on regular medications?
Please let me know
If you don't have a fever, then it might not be an active infection at present.
Long term catheters can cause bladder spasms which can be very distressing and painful.
White powder like stuff in the tube is most probably phosphaturia - sediments in the bladder due to catheter. This can be dealt with vitamin C supplements which will acidify the urine and help dissolve the sediments.
As far as the pain is concerned, the usual medications are anticholinergic drugs like tolterodine and solifenacin. If they are not working, the dose can be increased or a combination can be used. Myrebetriq or oxybutynin can be added which are better medications for bladder spasms. Last resort these drugs can be powdered and directly instilled into the bladder along with a lignocaine and heparin.
Botox injections are also used sometimes to treat severe bladder spasms.
We usually recommend a small dose of antibiotics to get rid of any mild infection which may be contributing to these spasms.
The catheter bulb has to be filled to the minimum to reduce irritation- may be a maximum of 7 ml.
I hope this helps you