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I think it is a case of relative increase of PCV in excited animals which may be possible due to constriction of blood vessels and Spleen as well.
Catheterisation, flushing of the bladder.
Hospitalization under fludidotherapy with Catheter left in place for 48h. If obstruction comes back within 48h, another 48h catheterisation can be tried.
If the obstruction is back again, surgery is advisable : perineal urethrostomy with or without cystotomy to remove massive stones.
Medical treatment during hospitalization and back home should involve antibiotic, NSAID, Urinary spasmolytics such as spasmoglucinol. Tamsulosine is also something very interesting to try.
Of course a high dissolution diet should be given.
Sometimes obstructions in cats are only spasmodic (spasmodic urethral stricture) and might be difficult to solve particularly with repeated catheterization that could increase pain and stricture.
Vitamin b complex