An EP study, like any other surgery, comes with a few risks, including:

• Bleeding or infection at the site where catheter is introduced
• Damage to the blood vessels
• Puncture of your heart
• Damage to your heart valves
• Damage to your heart's electrical system
• Blood clots in your legs or lungs
• Stroke or heart attack 

Watch this video to get a better understanding of the EP study and risks associated with it 

Reference - Health Encyclopedia. (n.d.). Retrieved from https://johnshopkinshealthcare.staywellsolutionsonline.com/Library/Encyclopedia/92,P07971