Electrophysiological examinations require the insertion of a catheter into the body and are “invasive”. As such, there are some risks, but they are minimal and the electrophysiology test is relatively safe. In some patients, the catheter insertion site (groin or arm) may bleed and blood may stasis under the skin, causing local swelling and/or ecchymosis. Very rarely, electrophysiological examinations can have more serious complications, including cardiac or vascular injury, thrombosis, and infection. Patient death is much rarer. Although most electrophysiologic exams do not have complications, you should be aware of the possibility of these risks. If you would like to know what risks are particularly relevant to you, please consult with your responsible physician.