Tachycardia – Causes, Symptoms and Treatment
Tachycardia refers to a heart rate exceeding 100 beats per minute. It can be harmless or indicate an underlying medical condition requiring treatment.
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Tachycardia refers to a heart rate exceeding 100 beats per minute. It can be harmless or indicate an underlying medical condition requiring treatment.
What is Tachycardia?
Tachycardia (from Greek tachys = fast and kardia = heart) is a condition in which the heart beats more than 100 times per minute at rest. The normal resting heart rate for adults is between 60 and 100 beats per minute. Tachycardia can be a temporary and benign response to physical activity, stress, or excitement, or it may signal an underlying health problem that requires medical attention.
Types of Tachycardia
Tachycardias are classified based on where in the heart they originate:
- Sinus tachycardia: The natural pacemaker of the heart (sinus node) fires faster than normal, often in response to exercise, fever, anxiety, or medications.
- Supraventricular tachycardia (SVT): Originates above the ventricles, in the atria or AV node. Often starts and stops suddenly.
- Atrial fibrillation: Chaotic electrical signals in the atria cause a fast and irregular heartbeat.
- Atrial flutter: A rapid but more organized electrical circuit in the atria.
- Ventricular tachycardia (VT): Originates in the ventricles and can be life-threatening, requiring immediate treatment.
- Ventricular fibrillation: The most severe form, in which the ventricles quiver uncontrollably and the heart can no longer pump blood effectively – a medical emergency.
Causes
Tachycardia can be triggered by a wide range of factors, including:
- Physical exertion or exercise
- Stress, anxiety, or emotional excitement
- Fever or infection
- Anemia (low red blood cell count)
- Hyperthyroidism (overactive thyroid)
- Heart disease (e.g., heart failure, heart attack, cardiomyopathy)
- Electrolyte imbalances (e.g., low potassium levels)
- Medications, caffeine, alcohol, or recreational drugs
- Dehydration
- Sleep deprivation or exhaustion
Symptoms
Not all cases of tachycardia cause noticeable symptoms. When symptoms do occur, they may include:
- Heart palpitations or a racing heartbeat
- Dizziness or lightheadedness
- Shortness of breath
- Chest pain or tightness
- Fainting or loss of consciousness (syncope)
- Weakness or fatigue
- Feelings of anxiety
Seek emergency medical help immediately if you experience chest pain, fainting, or severe shortness of breath alongside a rapid heartbeat.
Diagnosis
Several tests are used to diagnose and classify tachycardia:
- Electrocardiogram (ECG): Records the electrical activity of the heart and is the primary tool for identifying arrhythmias.
- Holter monitor: A portable ECG device worn for 24–48 hours to detect intermittent episodes of tachycardia.
- Event recorder: A wearable device that records heart rhythm when symptoms occur over an extended period.
- Echocardiography: An ultrasound of the heart to assess its structure and function.
- Blood tests: Evaluate thyroid function, electrolyte levels, and blood count.
- Electrophysiology study (EPS): An invasive procedure to map the electrical pathways of the heart and locate the source of the arrhythmia.
Treatment
Treatment depends on the type, cause, and severity of the tachycardia:
General Measures
- Treating the underlying cause (e.g., managing a thyroid condition or infection)
- Avoiding triggers such as caffeine, alcohol, and stress
- Vagal maneuvers (e.g., Valsalva maneuver) for certain types of SVT
Medications
- Antiarrhythmic drugs: Used to restore normal heart rhythm (e.g., beta-blockers, calcium channel blockers, flecainide, amiodarone)
- Anticoagulants: Blood thinners used in atrial fibrillation to reduce the risk of stroke
Procedures and Surgery
- Cardioversion: Electrical shock applied to reset the heart to a normal rhythm
- Catheter ablation: A minimally invasive procedure that destroys the tissue causing the abnormal electrical signals
- Implantable cardioverter-defibrillator (ICD): A device implanted in the chest to detect and treat life-threatening ventricular tachycardia
When to See a Doctor
Occasional rapid heartbeat after exercise or stress is usually not a cause for concern. However, medical evaluation is recommended if:
- episodes occur frequently or without an obvious trigger,
- accompanying symptoms such as dizziness, fainting, or chest pain are present,
- you have a known heart condition,
- or episodes are prolonged.
References
- European Society of Cardiology (ESC) – Guidelines for the management of patients with ventricular arrhythmias and the prevention of sudden cardiac death (2022). Available at: www.escardio.org
- American Heart Association (AHA) – Tachycardia: Fast Heart Rate. Available at: www.heart.org
- Zipes, D.P. et al. – Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 12th edition. Elsevier (2022).
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