Tachycardia is a heart rhythm disorder in which the heart beats faster than normal. Although a fast heart rate can be a normal response to exercise, stress or other factors, abnormal tachycardia can be dangerous and requires medical intervention.

What is tachycardia?

Tachycardia is a condition in which the heart beats faster than normal, usually more than 100 beats per minute at rest. Although sometimes a fast heart rate may be normal, such as during exercise or stress, tachycardia may indicate a problem if it occurs for no apparent reason.

Tachycardia occurs when the heart's electrical impulses that regulate the heartbeat are disrupted, causing the heart to beat faster than normal. This condition can cause symptoms such as dizziness, shortness of breath, chest pain, or loss of consciousness, and prolonged tachycardia can lead to complications that affect how the heart works.

There are several types of tachycardia, such as sinus tachycardia, which often occurs in response to external factors, and paroxysmal supraventricular tachycardia (PSVT), which can appear suddenly and be more intense. Accurate diagnosis and treatment are essential to control the condition and prevent potential heart damage.

Types of tachycardia

Tachycardia is divided into several types, depending on which part of the heart the rapid heartbeat occurs and what causes it. The main types of tachycardia are as follows:

• Supraventricular tachycardia (SVT): supraventricular tachycardia occurs when the electrical impulses that cause the heart to beat fast come from the upper parts of the heart, the atria or the atrioventricular (AV) node. PSVT (paroxysmal supraventricular tachycardia) is one subtype of this type and usually starts suddenly and can be very rapid, lasting a few seconds or minutes.
• Ventricular tachycardia: this type of tachycardia occurs in the lower parts of the heart - the ventricles. Ventricular tachycardia is a dangerous condition that can cause the heart to be unable to pump blood effectively, and if left untreated, can lead to serious complications such as heart failure or cardiac arrest.
• Atrial fibrillation (AFib): atrial fibrillation is the most common form of tachycardia, when the atria contract irregularly and very rapidly. This can cause blood to pump inefficiently and increases the risk of stroke.

Causes of tachycardia

Tachycardia can be caused by various factors that affect the electrical system of the heart or increase the workload of the heart.

Heart diseases

• Atherosclerosis: narrowing of the arteries caused by cholesterol and other fatty deposits reduces blood flow to the heart, increasing the risk of tachycardia.
• Myocardial infarction (heart attack): damage to the heart muscle reduces the efficiency of the heart and can cause arrhythmias.
• Cardiomyopathy: diseases of the heart muscle that reduce the heart's ability to pump blood effectively.
• Heart valve diseases: valve damage increases the workload on the heart and can cause tachycardia.
• Heart failure: the inability of the heart to meet the body's need for blood flow can cause a compensatory increase in heart rate.

Other medical problems

• Hypertension (high blood pressure): high blood pressure increases the workload of the heart.
• Anemia: the reduced amount of oxygen in the blood makes the heart work harder.
• Hyperthyroidism: excessive production of thyroid hormones increases metabolism and heart rate.
• Lung diseases: reduced oxygen supply increases the workload of the heart.

Lifestyle factors

• Stress and anxiety: emotional stress increases the level of adrenaline, which makes the heart beat faster.
• Smoking and alcohol: nicotine and alcohol affect heart rhythm.
• Illegal substances: cocaine, amphetamines, and other stimulants can cause dangerous tachycardia.

Electrolyte imbalance

• Changes in sodium, potassium, calcium and magnesium levels: Electrolytes are essential for the electrical activity of the heart. Their imbalance can cause rhythm disturbances.

Symptoms of tachycardia

Tachycardia symptoms can be different and depend on heart rate, type and cause of tachycardia.

Most common symptoms:

• Palpitations: a feeling that the heart is beating too fast, too hard or irregularly.
• Shortness of breath: difficulty breathing or feeling like you are not getting enough air.
• Dizziness or lightheadedness: reduced blood flow to the brain can cause these symptoms.
• Chest pain: there may be pressing, burning or sharp pain.
• Fainting (syncope): sudden loss of consciousness, which can be dangerous.

Other symptoms:

• Fatigue: constant tiredness or weakness.
• Sweating: excessive sweating for no apparent reason.
• Peaceless: a feeling that something is wrong.

Diagnosis of tachycardia

Accurate diagnosis of tachycardia is essential to determine appropriate treatment. The diagnostic process may involve several steps and examinations.

• Electrocardiogram (ECG): The electrocardiogram is the main method for recording the electrical activity of the heart. It helps to determine the type of tachycardia, heart rhythm disorders and possible signs of heart damage.
• Holter monitoring: a holter monitor is a portable EKG device that records your heart rhythm for 24-48 hours or more. This is particularly useful for identifying transient arrhythmias that may not show up during a standard ECG.
• Stress Tests: A stress test measures how the heart works during physical exertion. The patient will be asked to walk on a treadmill or ride an exercise bike while the EKG, blood pressure and heart rate are recorded.
• Echocardiography: A cardiac ultrasound uses sound waves to produce images of the heart's structure and function. It helps detect damage to the heart muscle, valve problems, and other structural abnormalities.
• Electrophysiological examinations: in these tests, catheters with electrodes are placed in the heart to pinpoint the origin of the arrhythmia. This is particularly useful when planning ablation procedures.
• Additional examinations:

  • Blood tests: to check electrolyte levels, thyroid hormones, anemia, and other factors.
  • Chest X-ray: an enlarged heart or lung problems may be detected.
  • Magnetic resonance imaging (MRI): provides detailed images of the heart.

Tachycardia treatment

The goal of treatment is to slow the fast heartbeat, prevent episodes from recurring, and reduce the risk of complications.

• Catheter ablation:

  • A minimally invasive procedure in which small areas of heart tissue that cause arrhythmia are destroyed with the help of catheters. Radiofrequency energy or cryotherapy (cold) is used.
• Implantable devices:

  • Cardioverter-defibrillator (ICD): A device that is implanted in the chest and monitors the heart rhythm. If a dangerous arrhythmia is detected, it delivers an electrical impulse to restore a normal rhythm.
  • Pacemaker (heart pacemaker): A device that keeps the heart beating if it is too slow or irregular.
• Surgical procedures:

  • in rare cases, heart surgery may be needed to correct structural problems such as heart valve disease or congenital abnormalities.
• Lifestyle changes:

  • Quitting bad habits: quit smoking, limit alcohol and caffeine consumption.
  • Stress controls: practice relaxation techniques such as yoga, meditation or deep breathing exercises.
  • Healthy diet: reduce the consumption of cholesterol and saturated fat, increase the amount of fruits, vegetables and whole grain products in the diet.
  • Regular physical activities: consult your doctor about an appropriate exercise program.

Tachycardia complications

Untreated tachycardia can cause several serious complications that significantly affect health and quality of life. Here are the main complications of tachycardia:

• Heart failure: prolonged rapid heart rate can weaken the heart because it cannot pump blood efficiently, leading to heart failure. This happens because the heart is overworked, putting an increased strain on the muscle.
• Stroke: if the tachycardia is associated with atrial fibrillation (a form of tachycardia), there is a high risk of stroke. Irregular heart contractions can contribute to the formation of blood clots in the atria. If the clot travels to the brain, it can cause a stroke.
• Cardiac arrest: some types of tachycardia, such as ventricular tachycardia or ventricular fibrillation, are life-threatening and can lead to sudden cardiac arrest (the heart pumps blood ineffectively or stops completely). This situation requires immediate medical attention as it can be fatal.
• Circulation disorders: prolonged tachycardia can impair blood flow to important organs such as the brain and kidneys. Inadequate blood supply can cause damage and deterioration of these organs.
• Dizziness and loss of consciousness: tachycardia can cause insufficient blood supply to the brain, which can cause dizziness and temporary loss of consciousness (syncope). This can be especially dangerous if a person loses consciousness, for example while driving a vehicle.
• Formation of blood clots: tachycardia, especially in atrial fibrillation, can contribute to the formation of blood clots in the heart. These clots can travel into the bloodstream and cause serious complications such as stroke or pulmonary embolism.
• Low blood pressure: some types of tachycardia tend to lower blood pressure, which can cause weakness, confusion, and loss of consciousness.

Complications of tachycardia can be life-threatening, so it is important to seek medical attention early to identify and treat the condition before it causes serious consequences.

Tachycardia and other heart diseases

• Arrhythmia: tachycardia is one type of arrhythmia. Arrhythmias are any abnormal heart rhythm that can be too fast, too slow, or irregular. Controlling tachycardia is essential to prevent complications and maintain heart health.
• Atherosclerosis and cholesterol: atherosclerosis causes the arteries to narrow, reducing blood flow to the heart and increasing the risk of tachycardia. Elevated cholesterol levels contribute to the development of atherosclerosis. Get your cholesterol checked regularly and follow a healthy diet to keep it under control.
• Hypertension: high blood pressure increases the workload of the heart and promotes thickening (hypertrophy) of the heart muscle, which can cause tachycardia. Controlling hypertension is essential for heart health.
• Cardiomyopathy: cardiomyopathy is a disease of the heart muscle that reduces the heart's ability to pump blood effectively. It can cause tachycardia and heart failure. Early diagnosis and treatment can improve prognosis.

Prevention of tachycardia

Prevention of tachycardia and other heart diseases is an essential step in maintaining heart health and preventing serious complications. 

• Healthy lifestyle:

  • Nutrition: choose a diet low in cholesterol and saturated fat. Eat more fruits, vegetables, whole grains, and lean protein.
  • Physical activities: regular moderate physical activity such as walking, swimming or cycling can improve heart health.
  • Weight control: maintain a healthy weight to reduce strain on the heart.
  • Smoking cessation: smoking increases the risk of heart disease. Quitting smoking will greatly improve your heart health.
  • Limiting alcohol consumption: excessive alcohol consumption can cause heart rhythm disorders.
• Stress controls:

  • Relaxation techniques: meditation, yoga and deep breathing exercises can reduce stress and anxiety.
  • Time management: avoid taking on too much work and responsibilities.
  • Social support: share your feelings with friends and family.
• Regular medical check-ups:

  • Blood pressure control: regular measurements will help detect hypertension at an early stage.
  • Cholesterol level test: regular blood tests will help control high cholesterol.
  • Heart health checks: EKGs and other tests can detect heart problems before symptoms appear.

Life with tachycardia

Living with tachycardia can be challenging, but with the right treatment and lifestyle changes, it is possible to maintain a good quality of life.

• Reliable communication with the doctor:

  • Regular visits: visit the doctor according to the schedule.
  • Symptom diary: write down your symptoms to help your doctor assess the condition.
  • Ask: don't hesitate to ask questions about your treatment and prognosis.
• Support system:

  • Family and friends: involve loved ones so they understand your condition and can provide support.
  • Support groups: join groups where you can share your experiences with other people with heart disease.
• Psychological support:

  • Psychotherapy: can help manage anxiety and depression associated with chronic illness.
  • Stress controls: learn techniques that will help you manage stress in your everyday life.

Tachycardia is a serious condition that can affect a person's health and quality of life. However, by understanding the causes, symptoms and treatment options, the patient can effectively control the condition and reduce the risk of complications.

Remember that a healthy lifestyle is essential for heart health. Get regular medical check-ups, follow a healthy diet, increase physical activity and quit bad habits. If you suspect tachycardia or other heart problems, consult your doctor immediately.

The heart is the engine of our life, and taking care of it is an investment in our long-term health and well-being.

Additional resources

• Latvian Association of Cardiologists: www.kardiologs.lv — information on cardiovascular diseases, specialist contacts and patient education materials
• Ministry of Health: official heart health information, prevention programs and health promotion initiatives
• Heart Health Centers: Local clinics and hospitals that offer specialized tests and treatments
• Support groups and forums: Online communities where you can share experiences and get support from other people with similar health problems