My dad is having a coronary artery stent put in Friday afternoon about noon. Everything should be fine.
Please remember him, my mom and my family in your prayers.
UPDATE: Everything went fine, no problems in the procedure. There was a possibility he might've had to had two stents because another artery nearby could've been blocked when the first one was opened up, but it turned out to not be necessary.
He should go home Sunday - thank you for all your kind words :)