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Hi this is Dr. Hill. I need to ask a couple of questions to help determine the next best step.
when he fell over, was he conscious? Was their any paddling, like a seizure?
My concern with that description is that he had a cardiac arrhythmia. If the heart is not pumping blood effectively due to an arrhythmia, then they can become weak, collapse and some times pass out. Because he is hyperthyroid, there is a strong possibility that he has underlying pathology of the heart. Has he had an ultrasound of his heart? Has he had a recent thyroid level?
Okay. It is a good idea to have him evaluated tonight. He may have a significant heart issue that is causing the collapse and most emergency clinics are going to be able to diagnose this, run a thyroid level in house and start him on medications if his heart rate is too high.
A cat at home resting should be around 100-120 beats per minute. You can take a 15 second count and multiply by 4 (easiest method)
Let me know when you get the rate. How is he breathing?
So sorry. Let me know what happens. take care.