Heart Racing? Why Cardioversion Resets Your Rhythm & Medically Approved Next Steps

A racing, fluttering, or irregular heartbeat can feel unsettling. If you've been told you have an abnormal heart rhythm — especially atrial fibrillation (AFib) — your doctor may recommend cardioversion.

Cardioversion is a medically approved treatment designed to restore a normal heart rhythm. It can be highly effective, but it's not a cure for every heart rhythm problem. Understanding how it works — and what comes next — can help you make informed decisions about your health.

Let's walk through what cardioversion is, when it's used, and what you should do if your heart feels "off."

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What Is Cardioversion?

Cardioversion is a medical procedure used to reset an abnormal heart rhythm (arrhythmia) back to a normal rhythm (called sinus rhythm).

It is most commonly used to treat:

• Atrial fibrillation (AFib)
• Atrial flutter
• Certain types of supraventricular tachycardia (SVT)

There are two main types:

1. Electrical Cardioversion

• A controlled electrical shock is delivered to the heart.
• Performed in a hospital or medical facility.
• You are given sedation, so you don't feel the shock.
• The shock briefly stops the abnormal electrical activity, allowing the heart to "restart" in a normal rhythm.

2. Pharmacologic (Medication) Cardioversion

• Certain antiarrhythmic medications are used to restore rhythm.
• May be given orally or intravenously.
• Often used when the rhythm issue is recent or less severe.

Both approaches are supported by major cardiology guidelines and are considered safe when performed under medical supervision.

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Why Does the Heart Need "Resetting"?

Your heart beats because of electrical signals. In conditions like atrial fibrillation, those signals become chaotic.

Instead of a steady, coordinated beat:

• The upper chambers (atria) quiver.
• The heart may beat fast and irregularly.
• Blood flow can become less efficient.

AFib doesn't always cause symptoms, but when it does, people often report:

• Heart racing or pounding
• Shortness of breath
• Fatigue
• Dizziness
• Chest discomfort

Over time, untreated AFib can increase the risk of:

• Stroke
• Heart failure
• Blood clots

Cardioversion aims to restore order to that electrical chaos.

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How Effective Is Cardioversion?

Electrical cardioversion is highly effective in the short term:

• Success rates for restoring normal rhythm often range from 70–90%, depending on how long AFib has been present and underlying heart health.
• The earlier it's performed after onset, the higher the chance of success.

However, cardioversion does not cure atrial fibrillation. Many patients experience recurrence, especially if risk factors are not managed.

Common factors that increase recurrence risk include:

• High blood pressure
• Obesity
• Sleep apnea
• Diabetes
• Heart disease
• Long-standing AFib

That's why cardioversion is often part of a broader treatment plan — not a standalone fix.

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Is Cardioversion Safe?

For most patients, cardioversion is considered safe and low risk when done properly.

However, there are important considerations.

Stroke Risk

If AFib has been present for more than 48 hours, blood clots may form in the heart. Resetting the rhythm could dislodge a clot and cause a stroke.

To reduce this risk, doctors may:

• Prescribe blood thinners for several weeks before and after cardioversion
• Perform a transesophageal echocardiogram (TEE) to check for clots

Other Possible Risks

• Temporary skin irritation (with electrical cardioversion)
• Brief abnormal rhythms immediately after the procedure
• Rare complications related to sedation

Your cardiologist carefully evaluates whether the benefits outweigh the risks in your case.

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What Happens After Cardioversion?

Restoring rhythm is only the first step. Long-term management is crucial.

Your doctor may recommend:

Medications

• Antiarrhythmic drugs to maintain normal rhythm
• Rate control medications if rhythm control isn't maintained
• Anticoagulants (blood thinners) to reduce stroke risk

Lifestyle Changes

Evidence shows that managing underlying health conditions significantly improves outcomes.

Key steps include:

• Maintaining a healthy weight
• Controlling blood pressure
• Treating sleep apnea
• Limiting alcohol
• Managing diabetes
• Regular physical activity (as advised by your doctor)

Ongoing Monitoring

AFib can recur silently. Your doctor may recommend:

• Periodic ECGs
• Wearable heart monitors
• Symptom tracking

If you're experiencing any concerning symptoms and want to understand whether they could be related to Atrial Fibrillation (AF), a quick assessment can help you determine if it's time to reach out to your doctor.

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When Is Cardioversion Urgent?

Sometimes cardioversion is performed urgently — even in the emergency room.

Immediate cardioversion may be needed if an abnormal rhythm is causing:

• Severe chest pain
• Low blood pressure
• Fainting
• Signs of shock
• Heart failure symptoms

In these situations, restoring rhythm quickly can be life-saving.

If you experience:

• Sudden chest pain
• Severe shortness of breath
• Fainting
• Weakness on one side of the body
• Trouble speaking

Seek emergency medical care immediately.

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Is Cardioversion Right for Everyone?

Not always.

Some patients do better with a rate-control strategy, where the focus is on controlling heart rate rather than restoring normal rhythm.

Others may eventually consider:

• Catheter ablation
• Long-term medication therapy

The right approach depends on:

• Your age
• How long you've had AFib
• Symptom severity
• Stroke risk
• Underlying heart disease
• Personal preferences

There is no one-size-fits-all solution.

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Common Questions About Cardioversion

Will I feel the shock?

No. You are sedated during electrical cardioversion.

How long does it take?

The procedure itself takes only minutes, but you'll spend a few hours in recovery.

Can AFib come back?

Yes. Recurrence is common, especially without managing risk factors.

Does cardioversion cure AFib?

No. It restores rhythm but does not eliminate the underlying tendency for abnormal electrical signals.

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The Bigger Picture: Don't Ignore a Racing Heart

A fast or irregular heartbeat is not something to dismiss — but it's also not something to panic over.

Many arrhythmias are treatable, especially when identified early.

If you notice:

• Frequent palpitations
• Unexplained fatigue
• Breathlessness with minimal exertion
• Irregular pulse

Taking a few minutes to check your symptoms using a tool for Atrial Fibrillation (AF) can give you clarity on whether you should schedule a visit with your healthcare provider.

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When to Speak to a Doctor

You should speak to a doctor if you experience:

• A new irregular heartbeat
• Persistent heart racing
• Symptoms lasting more than a few minutes
• Worsening fatigue or breathlessness
• Any signs of stroke

Heart rhythm issues can sometimes be life-threatening. Early medical evaluation is essential.

If something feels wrong, trust your instincts and seek care.

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Bottom Line

Cardioversion is a medically approved, often highly effective way to reset an abnormal heart rhythm. It can quickly restore normal function and relieve symptoms — but it is usually one part of a comprehensive treatment plan.

Managing risk factors, taking prescribed medications, and maintaining follow-up care are just as important as the procedure itself.

If you're experiencing symptoms of a racing or irregular heart, don't ignore them. Consider starting with a free symptom check and then speak to a doctor.

When it comes to your heart rhythm, timely action can make a meaningful difference in both safety and quality of life.