So the news is not great. In the course of a day Arabella's heart stopped several times for an average of 3.7 seconds. At other times it raced up between 250 and 300 bmp.
On the plus side her heart looks good. No physical abnormalities. So she is basically having "an electrical issue".
So for now the course of action is to increase her meds and retest in a couple of months. I feed her SOJOS dehydrated raw. I am going to start adding a bit more water to though. Not that it was recommended but just an instinct on my part. Arabella has never been a big drinker. And when I was having irregular heartbeats, it was from being dehydrated. I am just going to increase her water intake through her food. If it helps, great! If not, it won't hurt.