At what point should I be concerned about my cat's recovery from anaesthetic?

[Qofcheez]

36 hours ago my cat was neutered using a chinese anesthetic called Sumianxin.  He has been experiencing difficulties recovering.  The vet says that he had too much anesthetic, but little else.  THe local veterinarian admits that he has little experience with cats, and medicines in China are geared towards dogs.  He has limited capacity to help me.

THe cat was injected with furosemide after surgery to prevent pulmonary edema

His recovery has been like this:

First 12 hours -
Interest in food.  Tried to eat numerous time throughout the night.  Vomited food back up each time.
Would sit near water bowl but not drink
Upon arriving home used little box right away
THe rest of the day, he would urinate himself, making no attempt to get up until after wetting himself

After 24 hours
Cat returned to vet and was injected with 2 unknown agents to 'help him recover'
Upon returning home, cat went into closet to hide.
Hours later he was still there, I took him out and his back legs collapsed.  He remained on floor unwilling to move.
I rubbed some nutri-plus gel on lips and he got up and walked a few inches then collapsed again by water bowl
Drank a large amount walked about a foot and collapsed

Up to 36 hours
Shows little interest in moving or ability.  Can get up and walk a little, but will collapsed with what appears to be rapid, shallow breathing.  Interest in water, but refuses food

Cat is somewhat obese (5.4 kgs, notable stomach)

Several months ago cat recovered from Feline panleukopenia.  Has show no lasting effects from illness.

My issue now is that if the local vet is limited in his capacity.  No ability to run tests, x-rays, etc.  If I had some inkling of whether or not his behavior is normal or cause for alarm, I could at least try to find a veterinarian with the exact facilities that may be needed, though I'd need to know specifically what is required (advanced testing facilities are likely non-existent here).

Help is much appreciated.

[Arnold L Goldman, D.V.M.]

I also have never heard of this drug until now, but a little research shows it is used in research animals in many countries. Unsure about cats in particular.

As an aside, be advised there are generally no unsafe anesthetic drugs, only unsafe anesthetists. In the right animal, under the right circumstances and indications, most drugs may be safely used. It would behoove all pet owners to learn a little about anesthetic delivery and methodology. See my blog on this topic here:
http://www.medhelp.org/user_journals/index/931217

It is tragic that death is the result of what should be a quick, minor procedure, the neutering of a male cat, often performed successfully in mobile clinics (in a van) in the US. Pulmonary edema post neutering? It's shocking. You deserve an explanation, and a refund.

[Jim Humphries, B.S., D.V.M.]

We are not familiar with this anesthetic, but if it was an overdose we are very sorry this happened.  Cats are very special and require special treatments, medications and doses.  In the States we even have specialists who treat only cats.  

We are very sorry for your loss and for this bad experience.

[Qofcheez]

Sorry to say but Mao just passed from what appears to be Pulmonary edema.

Also present was hypothermia, rapid pulse, shallow breathing and fixed pupils in the period before death.

A new doctor said it was too high a dose of the anesthetic used.  

Thank you and I hope that this helps others understand what might be happening to their own pet should should similar things happen after anesthetic.