What is cardiac catheterization? Cardiac catheterization (cardiac cath or heart cath) is a procedure to examine how well your heart is working. A thin, hollow tube called a catheter is inserted into a large blood vessel that leads to your heart. View an illustration of cardiac catheterization.
A Troll is a magical creature of prodigious strength and immense stupidity.
The mythological troll is known to be an ugly, dirty, angry creature that lives in dark places, like caves or underneath bridges, waiting to snatch up anything that passed by for a quick meal. The internet troll is a modern version of the mythological version. They hide behind their computer screens, and actively go out of their way to cause trouble on the internet. Like the mythological troll, the internet troll is angry and disruptive in every possible wayâoften for no real reason at all.