Great news! My father-in-love got out of the hospital on Saturday!
They aren't sure exactly what caused his TIA, but he's on the mend and home.
In addition to several things I learned about how hospitals/doctors/tests work (thanks Sarah!!!!), I learned that being on Coumadin and an aspirin regimin do not guarantee that you will not form blood clots.
If a person has a condition called Atrial Fibrillation, it means one of the chambers of your heart doesn't fully empty with every heartbeat. Then the person has a condition where that chamber acts very much like a storm cloud that is making hail. A bit of blood is left behind after a heartbeat. That blood might then connect and make a clot with the bit of blood leftover from the previous beat. Coumadin and aspirin address this, but not 100%.
The best news of all is that for all the tests Dad had, he's gotten a lot of information regarding his carotid arteries and the vessels in his brain as well. He's very healthy.
It was an unusual occurrence, but one we now know a great deal about.
On the topic of Blog Housekeeping:
Instead of reinstating the "Word Verification" to keep out spam, I have made it so I have to "moderate" comments before they are published on my blog.
I am certainly not getting a lot of traffic, just a tiny bit really.
However, I am getting legitimate bloggers that leave a cryptic note and then finish their comment with,
"Oh, and take a look at the townhome I own and would like you to rent".
What this means is, your comment, should you leave one will not be immediately published.