Atrial fibrillation living in infants

Overview

Atrial fibrillation (AFib) is a heart condition where the upper chambers of the heart beat in a fast, irregular way. In infants, this is very rare and usually happens because of another heart problem.

No, atrial fibrillation is very uncommon in infants. It is seen much more often in adults.

Atrial fibrillation in infants usually affects babies who have congenital heart defects (heart problems present at birth), who have had heart surgery, or who have certain infections or electrolyte imbalances.

Symptoms

Common symptoms

• Irregular or fast heartbeat (felt by doctor or on monitor)
• Rapid breathing or trouble breathing
• Poor feeding or difficulty sucking
• Irritability or unusual fussiness
• Paleness or bluish skin color (especially around the mouth)
• Sweating during feeding
• Poor weight gain

Symptoms in children

• In older children, symptoms can also include feeling dizzy, lightheaded, or like the heart is racing or fluttering (palpitations).

Causes

Main causes

• Congenital heart defects (structural heart problems present at birth)
• Recent heart surgery or catheter procedures
• Severe infections (such as pneumonia or sepsis)
• Electrolyte imbalances (like low potassium or magnesium)
• Certain medications or toxins

Risk factors

• Being born with a heart condition
• Having heart surgery in infancy
• Premature birth (babies born too early)

When to see a doctor

See a doctor urgently if:

• Your infant has any of the emergency symptoms listed above.

Book a routine appointment if:

• You notice your baby's heart seems to be beating fast or irregularly on multiple occasions.
• Your baby is not feeding well, gaining weight slowly, or seems tired all the time.
• Your baby has a known heart condition and you have any concerns.

Diagnosis

To diagnose atrial fibrillation in an infant, a doctor will listen to the heart, ask about symptoms, and order tests to check the heart's rhythm and structure.

Tests that may be done

• Electrocardiogram (ECG or EKG) — a quick, painless test that records the heart's electrical activity
• Holter monitor — a portable ECG device worn for 24 to 48 hours to catch irregular rhythms
• Echocardiogram (echo) — an ultrasound of the heart to look for structural problems
• Blood tests — to check for infections or electrolyte imbalances

What to expect at your appointment

Your baby may need to stay in the hospital for monitoring and tests. The doctors will work to find the cause of the irregular rhythm and decide the safest treatment. You will be guided through each step and can ask questions at any time.

Treatment

Treatment for atrial fibrillation in infants focuses on controlling the heart rate and rhythm, fixing any underlying cause, and preventing complications. Because the condition is rare in babies, treatment is tailored to each child.

Self-care at home

• Follow your doctor’s advice on feeding, sleeping, and activity for your baby.
• Keep a record of any symptoms or changes you notice and share them with your healthcare team.
• Attend all follow-up appointments for monitoring.

Medical treatments

Doctors may use medicines to slow or regulate the heart rate or to help the heart beat in a normal rhythm. In some cases, a procedure called cardioversion (a controlled electric shock to reset the heart rhythm) may be used. If an infection or electrolyte problem is found, that will be treated as well.

When is surgery considered?

If the atrial fibrillation is caused by a structural heart problem, surgery may be needed to repair the defect. This is decided by a pediatric heart specialist.

Living with this condition

Most infants with atrial fibrillation will be followed closely by a pediatric cardiologist. Regular check-ups and monitoring of heart rhythm are important. Your baby can still be held, cuddled, and loved normally. Follow your doctor's guidance on feeding and daily care.

Lifestyle tips

• Create a calm, quiet environment to help your baby rest.
• Avoid overstimulation and stress for your baby.
• Keep a log of feeding times, sleep patterns, and any symptoms.

Diet and exercise

Your baby’s diet should be as recommended by your pediatrician. For older infants, a balanced diet supports overall health. Exercise is not a concern for infants — tummy time and gentle play are fine unless your doctor advises otherwise.

Mental health and emotional wellbeing

Having a baby with a heart condition can be stressful for parents. It is normal to feel anxious or overwhelmed. Talk to your doctor about support groups or counseling. Taking care of your own mental health helps you care for your baby.

Prevention

Atrial fibrillation in infants cannot always be prevented, especially if it is due to a congenital heart defect. However, good prenatal care and managing health conditions during pregnancy may lower some risks.

Screening programmes

Routine newborn checks often include listening to the heart. If a heart problem is suspected, further tests can be done early. There is no routine screening for atrial fibrillation in all infants.

Complications

If left untreated

• Heart failure (the heart cannot pump blood well enough to meet the body's needs)
• Poor growth and development due to reduced blood flow
• Blood clots that could lead to a stroke (rare in infants but possible)

Long-term outlook

With proper treatment and follow-up, most infants with atrial fibrillation do well. Many grow up to be healthy children. The outlook depends on the underlying cause, but modern heart care gives babies the best chance for a good life.

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