About Bigeminy
What Is Bigeminy?
This rhythm happens because of a small misfire in the heart's electrical system, causing premature contractions. These can occur in the lower chambers (ventricles) known as premature ventricular contractions (PVCs). It can also occur in the upper chambers (atria) called premature atrial contractions (PACs).
People may experience bigeminy as heart palpitations or fluttering, often described as the heart skipping a beat. While many individuals may experience bigeminy at some point without any concern, severe or frequent episodes may indicate an underlying medical issue that requires treatment. If someone experiences a sensation of skipped heartbeat or palpitations, it is advisable to contact a doctor for further evaluation and diagnosis.
Bigeminy Causes and Risk Factors
Bigeminy happens when every other heartbeat is an early beat. These early beats most often start in the lower chambers of the heart, called premature ventricular contractions (PVCs), but they can also start in the upper chambers, called premature atrial contractions (PACs).
Bigeminy is caused by changes in the heart’s electrical signaling. In many people, especially those with an otherwise healthy heart, no single cause is found. In others, bigeminy may be linked to a medical condition, a medication, or a trigger that makes early beats more likely.
Possible causes and contributing factors include:
- Heart conditions, such as coronary artery disease, heart failure, cardiomyopathy, heart valve disease, high blood pressure, or scarring from a previous heart attack
- Medical conditions that can affect heart rhythm, such as anemia or an overactive thyroid
- Electrolyte imbalances, including potassium, magnesium, or calcium levels that are too high or too low
- Certain medications or stimulants, including some medicines used for asthma, colds, allergies, or attention-related conditions
- Substances that can stimulate the heart, such as caffeine, nicotine, alcohol, or recreational drugs
- Stress, anxiety, dehydration, or not getting enough sleep
Risk factors are things that make bigeminy or other premature beats more likely. They include older age and having an underlying heart condition. Some triggers, such as caffeine, alcohol, tobacco, dehydration, stress, and poor sleep, may be reduced or avoided if they seem to bring on symptoms.
Because the same triggers and risk factors can also apply to other heart rhythm problems, a healthcare professional may recommend an evaluation to look for an underlying cause, especially if palpitations are frequent, new, worsening, or occur with chest pain, shortness of breath, dizziness, or fainting.
Bigeminy Symptoms
Bigeminy does not always cause symptoms. Some people only learn they have bigeminy after an electrocardiogram (ECG) or heart rhythm monitor shows the pattern.
When symptoms do occur, they are usually related to the early beats and the pause that follows them. People may describe the feeling in different ways, such as:
- A fluttering, pounding, or flip-flopping feeling in the chest
- A sensation that the heart skipped or missed a beat
- Feeling more aware of the heartbeat than usual
- A heartbeat that feels irregular or unusually forceful
Some people with bigeminy may also have symptoms such as:
- Dizziness or lightheadedness
- Fatigue or weakness
- Shortness of breath
- Chest discomfort or chest pain
- Fainting or feeling like you might faint
Symptoms can vary from person to person, and their intensity does not always match how serious the rhythm pattern is. A healthcare professional can help determine whether symptoms are related to bigeminy, another heart rhythm problem, or a different health condition.
Seek immediate medical attention if palpitations occur with chest pain, shortness of breath, severe dizziness, fainting, or a heart rate that feels dangerously fast, slow, or irregular.
How Bigeminy Is Diagnosed
Bigeminy is diagnosed by recording the heart’s electrical activity and looking for a repeating pattern in which every normal heartbeat is followed by an early beat. A healthcare professional will also try to find out whether an underlying condition or trigger is contributing to the rhythm pattern.
Diagnosis may include:
- Medical history and symptom review: A healthcare professional may ask about palpitations, dizziness, fainting, chest discomfort, shortness of breath, exercise habits, sleep, stress, caffeine, alcohol, tobacco, medicines, and other substance use.
- Physical exam: The clinician may listen to the heart, check the pulse and blood pressure, and look for signs of an underlying heart or medical condition.
- Electrocardiogram (ECG or EKG): This test records the heart’s electrical activity and may show the bigeminy pattern if it is happening during the test.
- Holter monitor or event monitor: If bigeminy is not captured on a standard ECG, a wearable monitor can record the heart rhythm over a longer period, such as 24 hours, several days, or longer, depending on the monitor used.
- Blood tests: These may be used to check for contributing factors such as electrolyte imbalances or thyroid problems.
- Echocardiogram: This ultrasound of the heart may be recommended to check heart structure and pumping function, especially if symptoms are frequent or there is concern for heart disease.
- Exercise stress test: In some cases, this test can show whether exercise brings on, worsens, or reduces early beats and can help evaluate for other heart concerns.
These tests do not “stage” bigeminy in the way some diseases are staged. Instead, they help confirm the rhythm pattern, estimate how often early beats are happening, and look for an underlying cause or related heart condition.
Bigeminy Treatment Options
Treatment for bigeminy depends on the cause, the type and frequency of early beats, symptoms, and whether there is an underlying heart condition. Some people with bigeminy, especially those without symptoms or heart disease, may not need treatment beyond reassurance and follow-up.
Treatment options may include:
- Treating an underlying cause: If bigeminy is related to a thyroid problem, anemia, electrolyte imbalance, medication, stimulant use, or heart condition, treating that issue may reduce early beats.
- Lifestyle and trigger management: A healthcare professional may recommend reducing or avoiding triggers such as caffeine, nicotine, alcohol, dehydration, poor sleep, stress, or stimulant drugs if they seem to bring on symptoms.
- Medicines: If symptoms are bothersome or early beats are frequent, medicines such as beta blockers or certain calcium channel blockers may be used to reduce extra beats. Other antiarrhythmic medicines may be considered in selected cases, usually with closer medical supervision because they can have important side effects.
- Catheter ablation: If bigeminy is frequent, causes significant symptoms, contributes to weakened heart function, or does not improve with medicines, a specialist may recommend catheter ablation. This procedure uses thin tubes guided to the heart to target the area causing the abnormal electrical signals.
- Monitoring and follow-up: Repeat ECGs, wearable monitors, or heart imaging may be used to track the rhythm pattern and heart function over time. Monitoring helps guide treatment decisions but is not itself a treatment.
Cardioversion is not a typical treatment for isolated bigeminy, because bigeminy is usually caused by repeated early beats rather than a sustained rhythm that needs to be electrically reset. Pacemakers or implantable cardioverter-defibrillators (ICDs) are also not routine treatments for bigeminy alone, but they may be used when a person has other serious heart rhythm problems or specific heart conditions.
The right treatment plan depends on the person’s overall health and test results. A healthcare professional can explain whether bigeminy needs treatment and which options are safest and most appropriate.