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Any invasive procedure that requires catheters to be inserted in the body assumes some risk, however, the risk is quite small and the electrophysiology study is considered to be relatively safe.

Some patients may develop bleeding at the site of the insertion of the catheter, very rarely blood clots form inside the chambers of the heart or there is perforation of the vessels of the heart or heart valves.

Death during or related to the electro physiology study is extremely rare: less than 1 in 3,000. Following the electrophysiology study, one has to lay flat between four to six hours, and patients either will be admitted for further therapy with medications, or abilation, or may be discharged at that time, depending upon the results of the test. Supraventricular Tachycardia
Tachycardia is when the heart rate is faster than normal. Abnormal rhythms which affect the racing of the upper chamber are called supraventricular tachycardia.

The most common type is Atrioventricular (AV) node reentry: two different electrical pathways within the region of the AV node allow impulses to go in an uncontrolled, rapid, regular heart rate.

Wolff–Parkinson–White Syndrome is the combination of an accessory pathway that conducts from the atria to the ventricles (Creating a “Delta” wave on the electrocardiogram) and the occurrence of atrioventricular reentrant tachycardia and/or atrial fibrillation. Except for symptoms caused by these rhythms, there do not appear to be any long–term adverse effects of the Wolff–Parkinson–White Syndrome.