Cardiology jokes

Fat person: "Hey, what's up?"

Friend: "Your blood pressure!"

Me: Knock knock.

My Grandma: Who’s there?

Me: Interrupting cow.

My Grandma: Interrupting c-

[Dies from heart attack]

My cousin died last week. He needed a blood transfusion, but we didn't know his blood type. He just kept saying, "B positive, B positive," but it's hard to be positive with him gone.

My grandfather has the heart of a lion... And a lifetime ban from the zoo.

I would like to dedicate this song to a friend of mine, who was run over last week and is in hospital.

The wheels on the bus go round and round!

What is the easiest line to draw in the hospital?

My heartbeat.

What's the hardest line to draw in a hospital?

... A FLATLINE!