Let's find out exactly about the electrical activity of your heart? (Electrophysiology Study - EP Study)

Do you feel something strange in your heart, like a flutter? Sometimes doctors say they need to do a test to look more closely at the electrical activity of your heart. That's when we talk about this ``Electrophysiology Study``, or as we call it for short, ``EP Study``. Don't be afraid, let's talk about this simply.

What is an EP study?

Simply put, an EP study is a test that accurately analyzes the electrical activity in your heart. Imagine, our heart needs a small electrical signal to beat. When these signals are working properly, the heart beats in an orderly manner. Sometimes there is something wrong with these electrical signals, which means an irregular heartbeat ( arrhythmia ) . That's when an EP study is used to find out what the problem is and where the problem lies.

Doctors use cardiac catheters (very thin, small tubes) and computers to do this. These tubes are inserted into your heart and measure the electrical activity of your heart from there. It's like an EKG , but these sensors, which are placed inside your heart, can provide much more detailed and accurate information than sensors placed on the outside of your chest.

Think of it like a bus going on its regular route, at the right time, and in an orderly manner. But an irregular heartbeat (arrhythmia) is like a bus not going on its regular route, maybe starting at the wrong place, skipping a stop, or not going the entire route. Or it can go very fast, or it can go very slow. Those are the kinds of erratic signals that doctors need to look for. Only then can they decide if this condition is dangerous and how to treat it.

How do you detect this electrical heart activity?

The lab where this `(EP Study)` is done is like a detective's office. The specialist doctor who does this is an `( Electrophysiologist )` who is well-versed in heart rhythm patterns. He can tell how different parts of the heart are working from the different wave patterns on an `(EKG)` tape.

These doctors have studied EKG waves, how they should normally look, and what it means if a wave looks different. They pay close attention to where an irregular heartbeat begins and ends on an EKG.

Then, they think, "Okay, this is what might be going on." Then they test it in the EP Lab. They give certain drugs (like Adenosine, Isoproterenol) to speed up and slow down the heart , and then they watch how the electrical activity of the heart changes. This is done according to a specific plan, not just guessing. Based on the information they gather, they think of several possible causes and then they test until they find out what exactly is wrong .

Why are you doing this EP study?

An EP study can tell your doctor a lot about your irregular heartbeat . For example:

• What kind of heart rhythm disorder (arrhythmia) do you have?
• What is the reason for this irregularity?
• Exactly where in the heart does this problem begin?
• What is the reason why you often feel dizzy and have trouble dreaming ?
• Decide what the best treatment for this is.
• Check if the medication you are currently taking is working properly .
• Find out if you are at risk of sudden cardiac death .

A doctor decides to perform an EP Study when they are unable to obtain sufficient information from tests such as an ECG, a Holter monitor (a device that monitors the heart rhythm while you are in bed for about a day or two), an event recorder , a stress test (which monitors the heart during exercise), an echocardiogram (an ultrasound scan of the heart), or an angiogram (which monitors the arteries in the heart).

Sometimes, depending on your condition and the information obtained from the EP Study, a treatment called Catheter Ablation can be performed at the same time . This means that small areas in the heart that are causing irregular electrical signals are deactivated through a catheter (tube) inserted into the heart.

How should you prepare for EP study?

There are a few small preparations you need to make before this test. Don't worry, these are normal things.

• Arrange to have someone accompany you to and from the hospital. You will not be able to drive for 24 hours after the test.
• If you have any questions or concerns about this test, please discuss them with the doctor.
• Tell us if you are allergic to latex or have had previous problems with anesthesia .
• Come dressed in comfortable clothes .
• Remove all makeup and nail polish before coming to the hospital.
• Leave all valuable jewelry like rings, necklaces, and watches at home. Bring your glasses and hearing aids, if you have them.

Let's also take a look at medicine and food:

• Tell your doctor about all the medications you take (prescribed, over-the-counter, herbal, vitamins) .
• Bring enough of your medication for one day. But don't take it until you've talked to your doctor.
• Ask your doctor what medications you should take before the test, what medications you should stop, when to stop, and when to start again . Do not stop any medication without your doctor's advice.
• If you have diabetes, ask how you should adjust your diabetes medication .
• Eat normally the night before the test.
• Do not eat, drink, or chew anything after midnight the night before the test. Not even chewing gum, mints, or water. This is very important for your safety.
• If you must take medicine, take it with just a sip or two of water.
• Don't swallow water while brushing your teeth.

What to expect on the day of the EP study?

Your test will be performed in a special room called the Electrophysiology Lab (EP Lab) or Catheterization Lab .

After you lie down on a bed, the doctor and the team there will do the following:

• An intravenous (IV) line (similar to a saline line) will be placed in your arm or hand. This is where you will be given medications and fluids during the test.
• If necessary, your armpits, arms, or neck will be shaved and cleaned with a disinfectant solution.
• You will be covered from neck to toe with a sterile cloth.
• To prevent your hands from touching the disinfected areas, a belt is placed around your waist and your arms are raised.

What happens during the EP study?

Now is the most important moment. Here are the things the doctor will do:

• Your groin, neck, or arm (where the catheter is inserted) will be numbed with a special medicine.
• Then, several of these catheters (thin tubes) are inserted into a large vein in your groin, neck, or arm.
• Using `Fluoroscopy` (this is like an `X-ray` video) and an `Ultrasound` machine, these catheters are guided precisely into your heart, into its chambers. These catheters are used to detect and record the electrical activity of the heart. This allows you to get a better understanding of the `Conduction System`, the system through which electrical signals travel in your heart.
• Through a catheter, a device called a pacemaker sends small electrical signals to speed up your heart rate. At this time, you may feel your heart beating a little faster and harder.
• Depending on your condition, if there are faulty connections that are causing irregular electrical signals, they can be deactivated using a procedure called `Catheter Ablation` .

The most important thing is that if you feel anything uncomfortable or strange during the EP Study, tell the doctor or nurse there.

If you have an irregular heartbeat, your doctor will give you medications through your IV to see how well they control it. If necessary, they may also give you a small electrical impulse through a patch on your chest to help restore your heart's rhythm.

Throughout this examination, your medical team will use various instruments:

• Fluoroscopy: A large X-ray machine above you. This allows the doctor to continuously see the catheter inside your heart on an X-ray screen.
• `Defibrillator / Pacemaker / Cardioverter`: This is connected to a patch on your back and a patch on your chest. It can give electrical pulses to speed up a slow heart beat or stop a dangerous rhythm.
• Electrocardiogram (EKG): This is connected to several sticky patches on your chest, as well as to catheters inside your heart. It produces a picture of the electrical signals passing through your heart.
• Intracardiac Echocardiogram: This is a small ultrasound. It helps to accurately guide the catheter during the test.
• Blood Pressure Monitor: This is attached to a cuff on your arm and monitors your blood pressure throughout the test.
• Oximeter Monitor: This is a small clip that you put on your finger. It measures the level of oxygen in your blood.

What to expect after the test?

After the EP Study is complete, the doctor will remove the catheter from your groin, arm, or neck and apply pressure to the area for a short time to stop the bleeding. Then:

• You will need to stay in bed for about one to four hours . If the catheter was inserted through the groin, you should keep your leg as straight as possible and without moving it.
• Depending on the initial results of your test, you may need to stay in the hospital if necessary .
• A small sterile bandage (dressing) is placed over the catheter. It can be removed the next day. In most cases, stitches are not needed.
• The injured area should be kept clean and dry .
• After the test, you can eat and take medicine.
• You can resume your normal activities the day after the test, but you may need to limit activities such as lifting weights for about a week.

Are there any risks in this?

An EP study is generally a very safe test. However, like any medical procedure, there are some risks. These include:

• Infection or bleeding at the site of catheter insertion.
• Irregular heartbeat (Arrhythmia) .
• A blood clot forms on the catheter and gets stuck in a blood vessel.
• Injury to a blood vessel, heart valve, or heart chamber.
• A heart attack.
• Stroke.

But don't worry, your doctors are doing this EP Study in a well-controlled environment. And they're taking special steps to minimize the risks to you. If you have any questions about the risks and benefits of this test, talk to your doctor.

What are the benefits of an EP study?

You can get the following benefits from an `(EP Study)`:

• You will get answers to your questions about what is wrong with your heart rhythm.
• Perhaps if a catheter ablation can solve the problem, we may be free from having to continue taking certain medications.
• Your quality of life will improve.
• For some heart rhythm disorders, treating them with ``Catheter Ablation'' may be a less expensive option than ``Arrhythmia'' surgery.

An EP study is generally safe. The risk of death from this is very low, about 1 in 5,000.

How do I get the results? What do I do next?

After the test, the doctor will tell you the preliminary results . Based on those results, they will decide whether you can go home or whether you need to stay in the hospital. The doctor may ask you to come back on a different day to discuss the results of the EP Study and your treatment further.

If the results show anything unusual, your doctor may be able to treat it right away with a ``Catheter Ablation''. If not, they may need to plan other treatments or prescribe medication for you. Some people may need other treatments, such as a ``Pacemaker' ', even after a ``Catheter Ablation''.

What time do you need to see the doctor?

When you go home after the test, you should definitely call your doctor if you experience any of these symptoms:

• If the catheter site is red, swollen, or has any fluid coming out of it.
• If you experience numbness or any strange sensation in the arm or leg where the catheter was inserted.
• If the fingers on the hand or leg where the catheter is inserted become cold, lose sensation, or change color.
• If you are going to vomit.
• If you have chest pain .

Call 1990 for emergency treatment, or go to the nearest hospital, if you experience any of the following:

• If the bleeding does not stop even after pressing and holding the catheter site.
• If the swelling around the wound suddenly increases.

A few more questions for you.

Are we awake when we do the EP study?

Yes. You're being given medication through an IV to calm you down and make you feel a little sleepy. But you 're not completely asleep.

How long does an EP study take?

It usually takes about one to four hours .

Is the EP study painful?

You will be given a sedative so you should not feel any pain. However, you may feel a slight pinching sensation on the skin where the catheter was inserted.

The most important things for you to remember

When you are asked to have an EP study, it may seem like a bigger deal than any other heart test you have had before. But your doctor is ordering it for a reason. He or she is doing it to find out exactly what is going on in your heart and to help you . An EP study involves inserting instruments into your heart, but it is a safe test. It gives your doctor the information he or she needs to treat your irregular heartbeat.

Remember, the medical team will do their best to make you comfortable during the test. Talk to them about any questions or concerns you may have. This will help you feel more at ease.

` Heart rate, EP study, heart disease, catheter, cardiac electrical activity, arrhythmia, heart tests