Okay, hon - hugs hugs. What a horrid time you have had, and how terrifying!

First of all - you will hear from a lot of people here who have cats with heart murmurs - even "serious" ones - that are living long and happy lives!

Second - there are inexpensive ways to prevent a blockage from recurring. My Oscar had crystals AND an infection. He and his fur brother are on Royal Canin SO food, and it got rid of the crystals - and prevent them coming back! Cole never had a problem - and now he never will.

Ask the vet for other ideas on prevention.

They will likely pass a wee catheter into him to unblock him and get the urine flowing. Their concern about the heart might be from them having to give him an anesthetic.

HUGS and PRAYERS for dear Butter!

And hugs to you...you did the right thing, and I think he will pull through. he is just too loved not to!