Gas anesthesia is best for CH cats, this is most commonly isoflurane or sevoflurane. This is greatly preferred as cats wake up and recover faster from gas anesthesia, so risk of unpleasant side effects are decreased. Ketamine should be avoided as it has a fairly long duration and recovery from it makes a very unpleasant experience for a wobbly kitty. No matter the type of anesthesia used, it is very important that your vet place an IV catheter and intubate your cat during surgery. They should monitor their blood pressure level constantly throughout the surgery.