Tachycardia is a heart rhythm disorder in which the heart beats faster than 100 times per minute at rest. It can start in the upper or lower chambers of the heart and may be harmless or life-threatening depending on the type.

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Tachycardia Treatment at Renova Hospitals

By Renova Hospitals

January 14, 2026

Tachycardia: Types, Symptoms, Diagnosis & Modern Treatment

Q: Is sinus tachycardia dangerous?

Sinus tachycardia is usually a normal response to fever, stress, dehydration, or exercise. However, if it is persistent or occurs without a clear cause, it should be medically evaluated.

Q: What is paroxysmal supraventricular tachycardia (PSVT)?

Paroxysmal supraventricular tachycardia is a sudden, fast heart rhythm that begins in the upper chambers of the heart and starts and stops abruptly. It can cause palpitations, dizziness, and chest discomfort.

Q: How serious is ventricular tachycardia?

Ventricular tachycardia is a dangerous rhythm that starts in the lower chambers of the heart. It can lead to collapse, cardiac arrest, or sudden death if not treated quickly with proper ventricular tachycardia treatment.

Q: How is tachycardia diagnosed?

Tachycardia is diagnosed using an ECG, Holter monitor, blood tests, echocardiogram, and sometimes an electrophysiology study to identify the exact rhythm and its cause.

Q: Can tachycardia be cured?

Some types, such as paroxysmal supraventricular tachycardia, can often be cured with catheter ablation. Other types may require long-term medicines or device therapy to control the rhythm.

Q: When should I seek medical help for a fast heart rate?

You should seek medical care if you have a persistent fast heartbeat, chest pain, fainting, severe breathlessness, or if the episodes keep returning.

Q: What are the most common symptoms of tachycardia?

The most frequent signs include palpitations (a racing or "flopping" chest sensation), dizziness, lightheadedness, shortness of breath, and chest pain.

Q: Is a resting heart rate of 110 bpm dangerous?

A resting heart rate consistently over 100 bpm is considered tachycardia. While it may not always be an emergency, it requires medical evaluation to rule out underlying heart disease or thyroid issues.

Q: Can anxiety cause tachycardia?

Yes. Anxiety triggers the "fight or flight" response, releasing adrenaline which naturally increases the heart rate. This is known as Sinus Tachycardia.

Tachycardia means your heart beats faster than it should — sometimes harmlessly after exercise or stress, but sometimes because of an electrical or structural heart problem that needs treatment. Knowing which is which matters. Here's a clear guide to the types of tachycardia, the symptoms to take seriously, and how fast heart rhythms are diagnosed and treated.

Tachycardia may:

Occur suddenly or gradually
Last seconds, minutes, or hours
Come and go (paroxysmal) or persist
Be mild and harmless or life-threatening

Overview

An ECG showing more than 100 beats per minute (at rest) indicates tachycardia

A resting electrocardiogram (ECG) that shows a heart rate above 100 beats per minute is considered tachycardia. However, not all fast heart rhythms are dangerous. Some, such as sinus tachycardia, are the body’s natural response to physical or emotional stress. Others, such as ventricular tachycardia, are medical emergencies that require immediate care.

When the heart beats too fast, it does not have enough time to fill with blood between beats. This reduces the amount of blood pumped forward to the brain and body. Over time, this can:

• Lower blood pressure
• Reduce oxygen delivery
• Strain the heart muscle
• Trigger fainting or collapse
• Increase the risk of blood clots

This is why prolonged tachycardia can damage the heart and threaten life.

What is tachycardia?

Tachycardia (ta-kih-KAR-dee-uh) is a type of abnormal heart rhythm (arrhythmia) in which the heart beats more than 100 times per minute at rest. Normally, your resting heart rate is between 60 and 100 beats per minute.

Tachycardia occurs when the electrical system of the heart sends signals too quickly or through abnormal pathways. This causes the heart muscle to contract more often than it should.

When the heart beats too fast:
• It cannot fill with enough blood
• Each heartbeat pumps less blood
• The body receives less oxygen
• Blood pressure may drop

These changes explain why tachycardia can cause dizziness, fatigue, chest pain, or fainting.

Types of tachycardia

Tachycardia is classified by where it begins.

Supraventricular tachycardias (SVT)

These start in the atria (upper chambers of the heart). They include:

• Sinus tachycardia
• Paroxysmal supraventricular tachycardia (PSVT)
• Atrial fibrillation
• Atrial flutter

These rhythms are often uncomfortable but usually not immediately life-threatening.

Ventricular tachycardias

These begin in the ventricles (lower chambers). They include:

• Ventricular tachycardia
• Ventricular fibrillation
• Torsades de Pointes

These rhythms are dangerous because they prevent the heart from pumping blood effectively and can cause sudden death without urgent ventricular tachycardia treatment.

Symptoms and Causes

What are the symptoms?

Some people feel no symptoms, while others experience severe distress.

Common tachycardia symptoms include:
• Racing or pounding heartbeat
• Fluttering in the chest
• Shortness of breath
• Chest pain or tightness
• Light-headedness
• Dizziness
• Fainting
• Nausea
• Extreme fatigue

Symptoms are often worse during fever, dehydration, stress, or physical exertion.

What causes tachycardia?

The heart’s rhythm is controlled by electrical signals from the sinoatrial (SA) node. Tachycardia occurs when these signals fire too quickly or travel through abnormal pathways.

Causes include:
• Sinus tachycardia from anxiety, pain, fever, or dehydration
• Heart disease or prior heart attack
• High blood pressure
• Thyroid disease
• Low blood sugar
• Pregnancy
• Anemia
• Infection
• Excess caffeine, nicotine, or alcohol
• Certain medications

What are the risk factors?

You are more likely to develop tachycardia if you have:
• A family history of rhythm disorders
• Obesity
• Diabetes
• Kidney or lung disease
• Untreated thyroid problems
• Structural heart disease
• Certain psychiatric or heart medicines

What are the complications?

Without proper tachycardia treatment, dangerous forms of tachycardia may lead to:
• Blood clots
• Stroke
• Heart attack
• Cardiomyopathy (weakened heart muscle)
• Sudden cardiac arrest

Diagnosis and Tests

How is tachycardia diagnosed?

Doctors evaluate your symptoms and heart rhythm using:

• Electrocardiogram (ECG)
• Holter or event monitors
• Stress testing
• Echocardiogram
• Blood tests
• Electrophysiology (EP) study

A sinus tachycardia ECG shows a normal rhythm at a fast rate. Ventricular tachycardia shows wide, abnormal electrical patterns.

Management and Treatment

How is tachycardia treated?

Treatment depends on the type, cause, and severity.

Procedures include:
• Vagal manoeuvres
• Catheter ablation
• Electrical cardioversion
• Implantable cardioverter defibrillator (ICD)
• Pacemaker

Medications include:
• Beta-blockers
• Calcium channel blockers
• Sodium and potassium channel blockers
• Anti-arrhythmic drugs
• Blood thinners

Emergency CPR may be required for life-threatening ventricular rhythms.

Outlook / Prognosis

• Sinus tachycardia usually resolves when the cause is treated
• Paroxysmal supraventricular tachycardia is often curable
• Ventricular tachycardia requires lifelong monitoring

With appropriate tachycardia treatment, most patients can live full, active lives.

Living With

How do I take care of myself?

• Control blood pressure, diabetes and cholesterol
• Take prescribed medicines correctly
• Avoid caffeine, alcohol, and tobacco
• Maintain a healthy weight
• Eat a heart-healthy diet
• Manage stress

When should I go to the ER?

Get emergency help if you have:
• Chest pain
• Fainting
• Severe shortness of breath
• Sudden collapse

Get Your Heart Rhythm Checked Early

Fast heart rhythms can be frightening. Whether you have sinus tachycardia, paroxysmal supraventricular tachycardia, or ventricular tachycardia, early diagnosis and the right ventricular tachycardia treatment can save lives. Renova Hospitals provide advanced ECG, electrophysiology testing, catheter ablation, and ICD therapy for comprehensive care.

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Find quick answers to common questions about our services, doctors, and care at Renova Hospitals. So you can feel informed and confident at every step.

Tachycardia: Types, Symptoms, Diagnosis & Modern Treatment

What is tachycardia?

Types of tachycardia

Symptoms and Causes

What causes tachycardia?

What are the risk factors?

Diagnosis and Tests

Management and Treatment

Outlook / Prognosis

Living With

Get Your Heart Rhythm Checked Early

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Frequently Asked Questions

What is tachycardia?

Is sinus tachycardia dangerous?

What is paroxysmal supraventricular tachycardia (PSVT)?

How serious is ventricular tachycardia?

How is tachycardia diagnosed?

Can tachycardia be cured?

When should I seek medical help for a fast heart rate?

What are the most common symptoms of tachycardia?

Is a resting heart rate of 110 bpm dangerous?

Can anxiety cause tachycardia?

What is the difference between SVT and VT?

Can lifestyle changes reduce tachycardia episodes?

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