Being in the hospital for the morning wasn't actually all that bad. The people were all so incredibly nice and Kent got to see the Australian medical system at work. They let him read the ecg- look at the scans- and watch the ultrasound. Really- Australians are the friendliest people ever.
Once everything came back clear my grandpa insisted that we go out and sight see the rest of the day. He ended up being able to leave on his scheduled flight the next day!