Hmm .. The chemical stress test.
Yep, I've had one.
There's no need to worry, they slowly inject a drug through an IV line which increases your heart beat .. If you are able they will ask you to peddle a stationary bicycle fairly slowly for 4 minutes, apparently this helps the drug along.
They use another drug to bring your heart rate back to normal if needed.
Every proceedure has risks but don't worry the risks are minor.
You probably won't know your heart rate has increased unless you can see the monitor.