Electrophysiology (EP) Study
An electrophysiology (EP) study is a catheter-based test that records the heart's electrical activity from the inside to pinpoint the source of an abnormal heart rhythm (arrhythmia). It is often performed together with catheter ablation, which can treat the problem in the same session.
Medically reviewed by the Florence Healthcare medical team · Last reviewed June 2026
Overview
In an EP study, thin, flexible catheters are passed through a vein in the groin up to the heart. They record the heart's electrical signals from inside and can gently stimulate the heart to bring on the abnormal rhythm under controlled conditions, so the exact circuit or focus causing it can be mapped. It is used for unexplained palpitations, fainting that may be rhythm-related, and to plan treatment of a known arrhythmia. Because the source can be identified precisely, catheter ablation is frequently carried out straight afterwards in the same procedure.
International patients receive coordinated scheduling, a clear explanation of findings and an itemized estimate, with remote review of prior ECGs and records.
Who is a candidate?
- Documented or strongly suspected arrhythmia
- Palpitations or episodes of a racing heartbeat
- Unexplained fainting (syncope) that may be rhythm-related
- To assess the need for ablation or a device
- Planning before catheter ablation
What happens
- 1
Preparation
You fast beforehand and may be asked to stop certain medicines. The groin area is prepared and you are given sedation.
- 2
During the study
Catheters are guided through a groin vein to the heart under X-ray. The heart's electrical signals are recorded and the rhythm is provoked and mapped; if appropriate, ablation is performed in the same session.
- 3
Afterwards
You lie flat for a short period to let the puncture site seal, are monitored, and usually go home the same or next day.
Benefits
- Precisely identifies the source of an arrhythmia
- Allows ablation to be done in the same session
- Guides decisions about devices or medication
- Minimally invasive, through a vein in the groin
Risks & considerations
- Bruising or bleeding at the groin puncture site
- Rarely, injury to a blood vessel or the heart
- Blood clots
- An arrhythmia provoked during the study, which is managed immediately
Conditions this treats
Where it is performed
This procedure is delivered by our Heart Center.
Learn more before you decide
Provider-reviewed guides on the related conditions, symptoms and tests in our Health Library.
Electrophysiology (EP) Study — frequently asked questions
An EP study diagnoses and maps the abnormal rhythm; ablation treats it by carefully destroying the small area causing it. They are often done together in one procedure.
You are given a local anesthetic and sedation, so it is generally not painful — you may feel your heartbeat change as the rhythm is tested.
Most people go home the same or next day and return to normal activity within a few days, avoiding heavy lifting briefly.
Often yes — if the source is found and suitable, ablation is performed immediately afterwards.
Your coordinator provides a transparent, itemized estimate, noting that ablation may be performed at the same time.
Related treatments
Considering electrophysiology (ep) study?
Share your reports for a medical second opinion and a transparent, itemized cost estimate — usually within 48 hours.