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Thank you for using Just Answer. My name is Rebecca; I am a veterinarian. Please give me a moment to type my answer.
I am sorry to hear about your cat being so sick.How old is he?Head pressing, circling, and getting stuck in corners are signs of brain/neurologic disease. If he had hepatoencephalopathy, I would expect his liver numbers on blood tests to be abnormal.He could have other brain disease, such as a brain tumor, meningitis, infection, etc. He could have high blood pressure, stroke, blood clot.How low is the potassium? How is his blood sugar?
Thiamine deficiency, although rare, can cause neurologic signs.
Why do you think he is constipated? Is he straining to defecate? Is he eating?
The potassium is low normal then, not a worry.If he has hepatic lipidosis, and cholangiohepatitis, he does have liver disease. This could be hepatoencephalopathy.Good he is eating. Keeping him hydrated will help with constipation. Adding a little pumpkin to his food might help. Try offering tuna juice or chicken broth if he is not drinking.
Hepatic encephalopathy means brain disease that is caused by liver disease. It is not a diagnosis by biopsy (except possibly a brain biopsy). The liver biopsy confirms liver disease, so his brain disease could be from his liver disease.Lactulose is a treatment for hepatoencephalopathy, and can help with constipation as well.
Giving vitamin K might also be a good idea if he has liver disease. It can help prevent blood clots.
The diagnosis would be identifying there is liver disease, and seeing the brain disease.You could have a test done to measure the amount of ammonia in his blood stream. If it is high, this is probably hepatoencephalopathy. If there are high levels of ammonia, from his liver disease, it affects the brain. However, it is often assumed if a cat is showing signs of encephalopathy (brain disease) and has liver disease, that there is a connection.
Thank you for the good rating. Please let me know now he is doing.