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Overview

What Is Patent Ductus Arteriosus?

Patent ductus arteriosus (PDA) is a heart condition in which a normal fetal blood vessel remains open after birth. The ductus arteriosus, also called the ductus botalli, connects the pulmonary artery and the aorta before birth. It normally closes soon after a baby begins breathing, but a persistent opening can allow blood to flow in the wrong direction between these major vessels. Small openings may have little effect, while larger ones can affect blood flow through the heart and lungs.

Symptoms

Patent Ductus Arteriosus Symptoms

  • Poor feeding
  • Sweating during feeds
  • Rapid breathing
  • Shortness of breath
  • Poor weight gain
  • Fatigue
  • Heart murmur

Many small PDAs cause no symptoms and are found when a clinician hears a characteristic murmur during an examination. Larger openings may cause signs of excess blood flow or heart strain, especially in premature infants. The type and severity of patent ductus arteriosus symptoms can vary with the size of the opening and the child’s overall health.

Causes

Causes of Patent Ductus Arteriosus

Before birth, the ductus arteriosus allows blood to bypass the developing lungs. After birth, changes in oxygen levels and blood pressure normally signal the vessel to narrow and close. If it stays open, blood can flow from the aorta toward the pulmonary artery, creating a patent ductus. This usually relates to development and is not caused by anything a parent did.

  • Prematurity increases the chance that the ductus will not close normally after birth.
  • Low birth weight is associated with a higher likelihood of a persistent ductus.
  • Congenital rubella infection can interfere with normal heart and blood-vessel development.
  • Genetic or chromosomal conditions may occur alongside a patent ductus.
  • Being born at high altitude may be associated with persistence of the ductus in some infants.

Risk Factors

Risk Factors for Patent Ductus Arteriosus

Developmental factors

Prematurity, low birth weight, female sex, family history, genetic conditions, and chromosomal conditions are associated with a higher likelihood of PDA. These factors are generally developmental or inherited and cannot be changed.

Prenatal and environmental factors

Congenital rubella infection and birth at high altitude may be associated with PDA. Rubella vaccination before pregnancy can help prevent infection when appropriate, but families should not blame themselves when PDA occurs.

Most risk factors for patent ductus arteriosus are not under a family’s control. Having one of these factors does not mean a child will develop a clinically significant PDA, and some children develop one without a known risk factor.

Complications

Complications of Patent Ductus Arteriosus

  • Pulmonary overcirculation can send too much blood through the lungs.
  • Heart failure can develop when the heart works too hard to manage the extra blood flow.
  • Pulmonary hypertension can result from increased pressure in the lung arteries.
  • Poor growth may occur when breathing and feeding require too much energy.
  • A persistent PDA may increase the risk of infective endocarditis in some situations.
  • Eisenmenger syndrome is a rare, advanced complication of a large untreated PDA and severe long-term changes in lung pressure.

Complication risk depends on the PDA’s size, the amount of abnormal blood flow, the child’s age and overall health, and whether the PDA is treated. A small PDA may never cause significant problems, while a large or untreated opening can strain both the heart and lungs.

Diagnosis

Diagnosis of Patent Ductus Arteriosus

A clinician may suspect PDA after hearing a continuous heart murmur or noticing symptoms such as rapid breathing or poor feeding. Some PDAs are found incidentally, while others are discovered during evaluation of a premature infant. The diagnosis is confirmed with tests that show the ductus and how blood moves through it.

  • An echocardiogram with Doppler uses ultrasound to view the heart and measure blood flow through the PDA.
  • A physical examination checks for a heart murmur, breathing changes, growth concerns, and signs of heart strain.
  • A chest X-ray may be used when clinicians need information about the heart’s size or the lungs.
  • An electrocardiogram may help assess the heart’s electrical activity and effects of increased workload.
  • Cardiac catheterization is reserved for situations requiring additional anatomical or treatment information.

An echocardiogram can show the PDA’s size, the direction and amount of blood flow, changes in the heart chambers, and pressure changes affecting the lungs. These findings help the care team decide whether observation, medication, or closure is appropriate.

Treatment Options

Patent Ductus Arteriosus Treatment Options

A small, symptom-free PDA may simply be monitored, while a significant PDA may need medication or closure. Treatment decisions depend on the child’s age, the PDA’s size, symptoms, blood-flow effects, and overall health; options differ for premature infants and older children.

Medicines such as indomethacin, ibuprofen, or acetaminophen may encourage the ductus to narrow and close in some premature infants. A neonatal team chooses medication based on the baby’s condition and kidney function, platelet or bleeding risk, intestinal health, and other contraindications. Clinicians monitor blood flow, urine output, kidney function, feeding, and heart or lung status during treatment, and more than one course may sometimes be considered.

During catheter-based closure, a specialist guides a thin tube through a blood vessel to the heart and places a small device that blocks the PDA. This approach is typically used for eligible infants, children, or adults when the vessel’s size and anatomy allow safe device placement. Possible risks include bleeding, vessel or heart injury, device movement, or residual flow; recovery is often brief, with follow-up imaging to confirm closure and check the device.

Surgical ligation or division may be considered when medication does not close the PDA, catheter closure is not suitable, or the child’s anatomy and condition require surgery. A surgeon reaches the ductus through the chest and ties it off or divides it, using an approach suited to the child. Recovery may require hospital monitoring for breathing, pain, and healing, and possible risks include bleeding, infection, injury to nearby structures, and recurrent or residual blood flow.

Outlook and Prognosis

Outlook and Prognosis for Patent Ductus Arteriosus

The outlook depends on the PDA’s size, symptoms, degree of prematurity, associated heart conditions, pulmonary pressures, and timing of treatment. Many children do well after the PDA is closed, especially when treatment occurs before lasting heart or lung changes develop. A small PDA may remain stable with observation, while a significant PDA requires ongoing medical follow-up.

  • Repeat echocardiograms may be needed to monitor heart function, pressures, and the PDA after observation or closure.
  • The care team may check for residual blood flow after a catheter procedure or surgery.
  • Activity guidance depends on heart function and treatment, so families should follow the cardiologist’s recommendations.
  • Cardiology follow-up may become less frequent after complete closure and reassuring test results.
  • Some children can eventually be discharged from cardiology care, while others need longer follow-up for associated heart or lung conditions.

When Should You See a Doctor

When Should You See a Doctor?

Get medical help

Know when symptoms need urgent attention

Seek emergency medical care for severe or worsening symptoms, especially:

  • Severe breathing difficulty or inability to catch the breath
  • Blue or gray lips or skin
  • Fainting or collapse
  • Extreme sleepiness or difficulty waking
  • Signs of poor circulation, such as cold, pale, or mottled skin
  • A baby who cannot feed because of breathing problems

Contact the pediatrician promptly for less urgent concerns such as a new murmur, poor feeding, sweating with feeds, rapid breathing, poor weight gain, or reduced activity.

A new heart murmur, poor feeding, sweating with feeds, rapid breathing, poor weight gain, or reduced activity should prompt a pediatric appointment, even if the child appears comfortable. The pediatrician can decide whether a heart evaluation or pediatric-cardiology referral is needed. Families should not wait for severe symptoms if they are concerned about patent ductus arteriosus symptoms.

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