Absence of the pulmonary artery is a rare congenital heart condition present from birth. People with absence of the pulmonary artery may have breathing trouble, poor exercise tolerance, or blue-tinged lips and skin, and some have no early symptoms. It is usually recognized in infancy or childhood, but milder cases may be found in adults during tests for shortness of breath. Treatment focuses on improving blood flow to the affected lung, with options like surgery, catheter-based procedures, oxygen, and medicines for pulmonary hypertension. Outlook varies by severity and timing of care, and many living with absence of the pulmonary artery do well with specialized follow-up.
Overview
Absence of the pulmonary arterySymptoms
Absence of the pulmonary artery can show up with fast breathing, bluish lips, poor feeding in babies, or exercise intolerance. Many have recurrent lung infections or cough up blood; doctors may find high pressure in the lungs.
Outlook and prognosis
Outlook with absence of the pulmonary artery varies widely. Some people stay active with careful follow-up, medicines, and procedures to improve blood flow; others may need surgery or catheter-based repair in childhood. Regular heart–lung care helps protect exercise capacity and long-term health.
Causes and risk factors
Absence of the pulmonary artery usually results from early fetal artery maldevelopment and is sporadic. It can accompany other congenital heart defects or chromosomal syndromes. Risk may increase with family history of heart defects, maternal diabetes, and harmful prenatal exposures.
Genetic influences
Genetics plays a meaningful role in Absence of the pulmonary artery, though not all cases are inherited. Variants linked to heart development, chromosomal changes, or syndromes (like 22q11.2 deletion) can contribute. Genetic counseling and testing can clarify risks for families.
Diagnosis
Doctors suspect Absence of the pulmonary artery from clinical features or a chest X-ray showing a small lung. The diagnosis of Absence of the pulmonary artery is confirmed with echocardiography and CT or MR angiography; prenatal ultrasound may detect it.
Treatment and drugs
Treatment for absence of the pulmonary artery focuses on easing strain on the heart and improving blood flow to the lungs. Options may include medicines to lower lung pressure, oxygen, and surgery or catheter procedures to create or enlarge blood flow pathways. Regular follow-up with congenital heart specialists guides timing and choices.
Symptoms
Breathing can feel harder during play, exercise, or even brisk walking. Many people with Absence of the pulmonary artery notice shortness of breath, frequent chest infections, or tiring sooner than peers. Features vary from person to person and can change over time. In babies and children, early features of Absence of the pulmonary artery can include fast breathing, feeding difficulties, or slow weight gain.
Feeling winded during play, climbing stairs, or walking fast. This can be more noticeable at higher altitudes or with colds.
Getting tired sooner than peers. Many need more breaks or avoid strenuous activity.
Repeated bronchitis or pneumonia. Colds may settle in the chest and take longer to clear.
Persistent dry or phlegmy cough. It may worsen with activity or during respiratory infections.
How people usually first notice Absence of the pulmonary artery?
Many families first notice something is wrong soon after birth when a baby has trouble breathing, looks bluish around the lips or skin (cyanosis), or tires and sweats with feeding; doctors may also hear a heart murmur or note low oxygen levels. In some cases, the first signs of absence of the pulmonary artery are picked up on a prenatal ultrasound or shortly after delivery with an echocardiogram when one lung’s blood flow appears missing or very reduced. When the condition is subtler, how absence of the pulmonary artery is first noticed may be later in infancy or childhood as poor weight gain, frequent lung infections on the affected side, or shortness of breath with activity prompt imaging that shows the absent vessel.
Types of Absence of the pulmonary artery
Absence of the pulmonary artery is a rare congenital heart condition with a few recognized variants based on which lung’s artery is missing and whether other heart differences are present. These variants can influence how early symptoms show up, how hard the heart and lungs have to work, and the kinds of treatments used. People may notice different sets of symptoms depending on their situation. When reading about types of Absence of the pulmonary artery, you’ll often see them grouped by side and by whether other heart defects are also present.
Right-sided absence
The right pulmonary artery is missing. Many have breathing trouble with activity and recurrent chest infections on the right side. Early symptoms of Absence of the pulmonary artery may show up in childhood or the teen years.
Left-sided absence
The left pulmonary artery is missing. This type is less common and often presents earlier in life. Symptoms may be more noticeable with feeding or growth in infants.
Isolated/unilateral type
Only one pulmonary artery is absent and no major additional heart defects are found. Exercise intolerance and uneven blood flow between lungs are common. Some develop high pressure in the lung vessels over time.
With other heart defects
The absent artery occurs along with other structural heart differences, such as a heart-vessel connection present at birth. Symptoms can be more severe and appear earlier. Care often focuses on stabilizing blood flow before addressing the missing artery.
Bilateral absence (rare)
Both pulmonary arteries are absent. This is very uncommon and usually identified in newborns. Breathing difficulties are severe and require urgent specialized care.
What genetics can tell you about symptoms
Certain genetic changes, like deletions on chromosome 22q11.2 or variants in TBX1, can disrupt heart and vessel development, leading to absence of a pulmonary artery. People may have breathing trouble, poor growth, bluish skin, or heart murmurs linked to these variants.
Causes and risk factors
Absence of the pulmonary artery develops before birth when the blood vessel to one lung fails to form. Many cases have no clear cause, but some occur with other heart defects or a genetic change. Risk factors for Absence of the pulmonary artery are not well defined, but maternal diabetes, rubella in pregnancy, and alcohol use during pregnancy may raise the chance. Some risks are modifiable (things you can change), others are non-modifiable (things you can’t). Family history of congenital heart disease or known genetic syndromes can increase risk, but many cases of Absence of the pulmonary artery are sporadic.
Environmental and biological risk factors
Understanding what raises the chance of this rare heart vessel difference can help expectant parents plan care early. Doctors often group risks into internal (biological) and external (environmental). These influences act in the first weeks of pregnancy, when the heart and arteries are forming, and knowing them can prompt timely checks if early symptoms of Absence of the pulmonary artery appear after birth.
Pregnancy at age 35 or older is linked with a higher chance of congenital heart differences. This may slightly increase the likelihood of rare vessel outcomes such as absence of the pulmonary artery. Regular fetal heart scans are often suggested.
High blood sugar around conception and early pregnancy can disturb how the heart and great vessels form. This raises the overall risk of heart defects, including absence of the pulmonary artery in rare cases. Good glucose control before and early in pregnancy lowers this risk.
When PKU is not well controlled before and during early pregnancy, the fetus has a higher chance of heart differences. Preconception and early-pregnancy management can reduce this risk.
Infection in the first trimester can disrupt development of the heart and large vessels. This can increase the chance of major vessel abnormalities, including rare anomalies such as absence of the pulmonary artery. Vaccination before pregnancy prevents rubella-related heart problems.
Genetic risk factors
Absence of the pulmonary artery is a rare birth difference that often happens sporadically, but genetics can play a role. In some children, it appears as part of a broader genetic syndrome or a small missing or extra piece of DNA. Carrying a genetic change doesn’t guarantee the condition will appear. Genetics usually do not predict early symptoms of absence of the pulmonary artery, but they can explain how the artery failed to form before birth.
22q11.2 deletion: A small missing segment on chromosome 22 can disrupt development of the heart and great vessels. In some children, this includes an absent or very small pulmonary artery.
Copy-number changes: Extra or missing stretches of DNA (copy-number variants) are linked to complex congenital heart defects. These changes can raise the chance of malformations that include absence of the pulmonary artery or a very narrow artery.
Single-gene variants: Rare changes in genes that guide early heart and vessel growth can affect pulmonary artery formation. Examples include genes involved in how the embryo builds the outflow tract and branch arteries.
Family history: Having close relatives with congenital heart disease suggests shared inherited influences. While patterns are often non-specific, this can slightly increase the chance of absence of the pulmonary artery in a future child.
De novo variants: Sometimes a genetic change arises for the first time in a child and is not present in either parent. These new variants can alter how the pulmonary artery develops before birth.
Recessive conditions: When both parents carry the same rare variant, a child may inherit a condition that affects vessel formation. This autosomal recessive pattern is uncommon but possible in some families.
Co-occurring defects: Absence of the pulmonary artery that appears alongside other heart or arch vessel differences has a higher chance of a genetic cause. In these situations, genetic testing may identify a change that explains the overall pattern.
Lifestyle risk factors
Absence of the pulmonary artery is a congenital condition; lifestyle habits do not cause it, but they can influence symptoms, exercise tolerance, and complications like pulmonary hypertension. Understanding how lifestyle affects Absence of the pulmonary artery helps you choose habits that support the lung and the right side of the heart. Below are practical, condition‑focused lifestyle risk factors for Absence of the pulmonary artery and ways to modify them.
Tobacco or nicotine vaping inflames airways and can worsen pulmonary hypertension in the lung that receives all the blood flow. It also raises the risk of infections and hemoptysis, which are particularly dangerous when one lung does most of the work.
Very vigorous or high‑strain workouts can trigger breathlessness, oxygen desaturation, or hemoptysis in people with this anatomy. Moderate, regular aerobic activity often improves stamina and breathing efficiency without overloading the right heart.
Excess sodium can promote fluid retention and leg swelling, increasing strain on the right side of the heart when pulmonary hypertension is present. A lower‑salt eating pattern may help control symptoms and reduce hospitalizations.
Excess weight increases the work of breathing and can elevate pulmonary pressures during activity. Gradual, sustainable weight loss often improves walking distance and daily activity tolerance.
Risk prevention
Absence of the pulmonary artery is present from birth, so the condition itself can’t be prevented. Prevention focuses on lowering the chance of complications like lung infections, bleeding, and high pressure in the lung circulation. Prevention is about lowering risk, not eliminating it completely. Regular care and a few steady habits can make day-to-day life safer and more comfortable.
See a congenital heart specialist regularly for check-ups. Ongoing imaging and tests help catch rising lung pressures and other changes early.
Keep flu, pneumococcal, and COVID-19 shots up to date; eligible infants may benefit from RSV protection. Vaccines lower the risk of serious lung infections in people with absence of the pulmonary artery.
If cough, fever, or breathing worsens, seek care early. Quick treatment can prevent pneumonia and reduce strain on the single working lung.
Do not smoke and avoid secondhand smoke, dust, and strong fumes. These irritants can worsen breathing and trigger infections in absence of the pulmonary artery.
Transmission
Absence of the pulmonary artery is a congenital heart condition present from birth and cannot be caught or passed between people. In most cases, it arises as a one-time change during early fetal development, with no clear family pattern.
Less often, this condition occurs as part of a broader genetic syndrome, so genetic transmission can happen if that syndrome is inherited, but this is uncommon. If Absence of the pulmonary artery is diagnosed in your family, a genetics professional can explain how Absence of the pulmonary artery is inherited in your situation and the chances in future pregnancies.
When to test your genes
Consider genetic testing if a baby is diagnosed with absence of the pulmonary artery, especially when there are other heart differences, facial or limb features, growth concerns, or developmental delays. Testing is also reasonable with a family history of congenital heart disease or known chromosomal syndromes. Results can guide cardiac care, screen for related conditions, and inform family planning.
Diagnosis
Absence of the pulmonary artery is usually found when someone has unexplained breathlessness, frequent chest infections on one side, or coughing up blood, and imaging raises concern for a missing lung artery. Doctors usually begin with a careful history and exam and then use targeted heart–lung scans to confirm what’s going on. The diagnosis of Absence of the pulmonary artery usually relies on imaging that shows the absent vessel and how the lung and heart have adapted. In some cases it’s first suspected before birth or during tests for high pressure in the lung circulation.
A clinician asks about breathlessness, chest pain, cough, infections, or reduced exercise tolerance and listens for quieter breath sounds on one side. They also check oxygen levels and look for signs of strain on the right side of the heart.
X-rays may show a smaller lung on the affected side with reduced blood markings and a shift of the heart or windpipe toward that side. These patterns can suggest the condition and guide next imaging steps.
An ultrasound of the heart evaluates heart structure and blood flow patterns. It can show right‑sided strain and estimate lung blood pressure, and sometimes hints that one pulmonary artery is not connecting as expected.
A contrast CT scan maps the chest blood vessels in detail to confirm the absent pulmonary artery and show any alternative collateral vessels. It also assesses the size and health of both lungs and the main pulmonary artery.
Stages of Absence of the pulmonary artery
Absence of the pulmonary artery does not have defined progression stages. It’s a structural difference present from birth, and how it affects day-to-day life varies widely—some people have few problems, while others develop breathing limits or infections over time—so it isn’t grouped into stage 1, 2, or 3. Different tests may be suggested to help confirm the anatomy and check how the heart and lungs are coping, such as an ultrasound of the heart (echocardiogram) and chest imaging like CT or MRI. Doctors track symptoms—including early symptoms of absence of the pulmonary artery like shortness of breath during activity or frequent chest infections—and follow-up exams to guide care and decide if treatments or surgery are needed.
Outlook and prognosis
Shortness of breath with feeds, poor weight gain, or getting winded faster than peers often shape day-to-day life with absence of the pulmonary artery. Many people ask, “What does this mean for my future?”, and the answer depends on which side is missing, whether the remaining lung and heart adapt, and if other heart differences are present. Some children do well for years with careful monitoring; others need surgery early to improve blood flow to the affected lung or to manage high pressure in the lung vessels. Early care can make a real difference, especially when specialists watch growth, oxygen levels, and early symptoms of absence of the pulmonary artery like repeated chest infections or exercise intolerance.
Doctors call this the prognosis—a medical word for likely outcomes. Survival varies: infants with a single missing pulmonary artery and no other major heart problems can reach adulthood, while those with complex heart anatomy or severe lung vessel hypertension face higher risks in childhood. Adults may notice breathlessness on hills, chest discomfort with exertion, or blood-tinged coughs; these signs suggest the need to reassess pressures in the lung circulation. With ongoing care, many people maintain school, work, and family routines, though activities may be tailored to stamina and oxygen needs.
Looking at the long-term picture can be helpful. Surgery to create or enlarge a connection to the underperfused lung, catheter procedures, and medications for pulmonary hypertension can improve symptoms and may extend life expectancy. Complications to watch for include pneumonia in the smaller lung, bleeding from enlarged airway vessels, and heart strain over time; managing these early lowers emergency risks. Talk with your doctor about what your personal outlook might look like, including when to seek urgent care for sudden breathing trouble, coughing blood, or fainting, and how often to plan imaging, heart checks, and vaccines to protect lung health.
Long-term effects
Living with absence of the pulmonary artery can shape stamina, breathing comfort, and day-to-day activities from childhood into adulthood. Long-term effects vary widely, and some people remain quite active while others face ongoing limits. Outlook often depends on which side is affected, whether other heart or lung differences are present, and when the condition was found. Many families first seek care because of early symptoms of absence of the pulmonary artery, but the long-term picture is guided more by heart–lung changes over time.
Higher pressure in the lung vessels can develop, especially in the remaining pulmonary artery. This can strain the right side of the heart over time.
Stamina may be lower than peers, with quicker shortness of breath during play, sports, or climbing stairs. These limits can stay stable for years or gradually increase if lung vessel pressures rise.
The underperfused lung is more prone to repeated chest infections and airway changes like bronchiectasis. These episodes can leave scarring that further reduces lung reserve.
Some develop coughing up blood due to fragile collateral blood vessels in the affected lung. Bleeding can range from streaks to heavier episodes that require urgent care.
How is it to live with Absence of the pulmonary artery?
Living with absence of the pulmonary artery often means planning your day around breathing comfort and energy. Many people pace activities, take breaks between tasks, and learn to read early signals like chest tightness, faster breathing, or unusual fatigue, especially at higher altitudes or with respiratory infections. Medical visits, heart–lung imaging, oxygen checks, and sometimes medicines or procedures become part of routine life, and friends and family may adjust plans, help with appointments, or learn what to do if symptoms flare. With clear communication and a care plan, most families find a steady rhythm that balances safety with the things that bring joy and connection.
Treatment and drugs
Treatment for absence of the pulmonary artery focuses on improving blood flow to the affected lung and protecting the heart and lung tissue. Care is highly individualized and often planned by a team that includes cardiology, pulmonology, and cardiothoracic surgery. Treatment plans often combine several approaches, such as medicines to ease strain on the heart or lower lung pressure, procedures to open or create a connection to the missing artery, and surgery to reconstruct blood flow or place a conduit. Some people with absence of the pulmonary artery also benefit from catheter-based interventions, oxygen therapy, vaccines to prevent lung infections, and careful exercise guidance, while a few may eventually need advanced options such as transplantation. Ask your doctor about the best starting point for you, since options depend on age, symptoms, lung development, and whether other heart differences are present.
Non-drug treatment
Living with Absence of the pulmonary artery can affect breathing, stamina, and how much activity feels comfortable day to day. Early symptoms of Absence of the pulmonary artery can include shortness of breath during exercise, cough, or chest discomfort, especially at higher altitudes. Non-drug treatments often lay the foundation for long-term care, whether used alone or alongside procedures and medicines. Care usually focuses on improving airflow, reducing bleeding risk, and protecting the healthier lung while planning for the future.
Surgeons may connect or enlarge the missing or underdeveloped vessel to direct blood flow to the affected lung. Doing this earlier in childhood can help lung growth and may prevent later complications. Complex cases are best handled at centers with congenital heart expertise.
If coughing up blood occurs, specialists can block enlarged collateral vessels with tiny plugs or coils to reduce bleeding. This can stabilize symptoms in Absence of the pulmonary artery and may be used as a bridge to other treatments. Repeat procedures are sometimes needed if new vessels form.
Extra oxygen can ease breathlessness and protect organs during sleep or exertion if levels drop. It may be recommended short term during flare-ups or long term based on testing. Ask your doctor which non-drug options might be most effective for your daily routine.
A supervised program of exercise training, breathing techniques, and education can build stamina and confidence. It helps people tailor activity safely when only one lung receives normal blood flow. Many people find non-drug therapies easier to maintain when visits are structured and goals are clear.
Your genes may have an impact on how drugs work for you
Even with the same heart condition, people can process medications differently because genes affect how fast the body activates, breaks down, or clears a drug. For absence of the pulmonary artery, genetics may guide dose choices, response, and side‑effect risk.
Pharmacological treatments
Medicines for absence of the pulmonary artery focus on easing high pressure in the lung’s blood vessels, protecting heart function, and managing day-to-day symptoms like breathlessness or cough. Choices depend on which lung is affected, your oxygen levels, and whether you’ve had airway bleeding. Not everyone responds to the same medication in the same way. Your care team may pair medicines with procedures or surgery when needed.
Bosentan, ambrisentan, and macitentan relax lung blood vessels to lower pressure. They require regular liver tests and strict pregnancy avoidance.
Sildenafil or tadalafil help lung vessels open and can improve exercise capacity. They should not be used with nitrates and can cause headache or flushing.
Riociguat boosts nitric oxide signaling to reduce lung pressure. It cannot be combined with PDE-5 inhibitors and must be avoided during pregnancy.
Epoprostenol, treprostinil, or iloprost act like a natural vessel-widening messenger to ease strain on the right heart. Options include IV, inhaled, or oral forms; side effects can include flushing and jaw pain.
Genetic influences
For most families, this heart difference arises by chance during early development rather than being directly inherited. If you’re wondering whether absence of the pulmonary artery is hereditary, most cases are sporadic, but genetics can be involved when it appears alongside other heart differences or broader genetic syndromes. Family history is one of the strongest clues to a genetic influence. Doctors may consider genetic testing or a referral to a genetic counselor when absence of the pulmonary artery occurs with additional features, growth or learning concerns, or when several relatives have congenital heart disease. Genes that guide how the great arteries form can affect whether the pulmonary artery connects properly, but even when a gene change is found, the severity and symptoms can vary widely from person to person. Sharing your family history and any early symptoms of absence of the pulmonary artery with your care team can help them tailor imaging and follow-up for you.
Is Absence of the pulmonary artery genetic?
Genetics plays a meaningful role in Absence of the pulmonary artery, though not all cases are inherited. Variants linked to heart development, chromosomal changes, or syndromes (like 22q11.2 deletion) can contribute. Genetic counseling and testing can clarify risks for families.
Pharmacogenetics—how genetics influence drug effects
Treatment for Absence of the pulmonary artery often centers on surgery, but many people also need medicines—for lung blood pressure, heart strain, clot prevention, or pain—where inherited differences can shape dosing and side effects. Even though early symptoms of Absence of the pulmonary artery vary, your response to these medicines later on may be partly genetic. For example, with blood thinners such as warfarin, some people need much lower or higher doses to reach a safe range because of differences in how the drug is broken down or how the body responds. After procedures, common pain relievers like codeine or tramadol may be too strong or not work at all in certain people; a “slow metabolizer” may process medicine more slowly, leading to higher levels and more side effects. Medicines for pulmonary hypertension and some heart drugs also pass through liver enzymes that vary from person to person, so doctors may start low and adjust based on how you feel and on lab checks rather than using a one‑size‑fits‑all dose. Genetic testing isn’t required for everyone, but when side effects or lack of benefit raise questions, it can help tailor treatment alongside your age, kidney and liver function, and other medications.
Interactions with other conditions
Climbing stairs or keeping up with a cold can be tougher when the lungs already receive blood flow from only one side, so respiratory infections often hit harder and linger. Doctors call it a “comorbidity” when two conditions occur together. Absence of the pulmonary artery frequently appears alongside other heart differences present at birth, such as small holes between heart chambers or tetralogy of Fallot, and these combinations can raise the chance of high pressure in the lung vessels (pulmonary hypertension). For many, this can mean wheezing, cough, or chest tightness that resembles asthma, and early symptoms of Absence of the pulmonary artery are sometimes mistaken for asthma or recurrent pneumonia. Conditions that strain the lungs or heart—like chronic bronchitis, sleep apnea, or untreated high blood pressure—can make breathlessness and exercise limits worse, and even common viral infections may lead to flare-ups or bleeding from the lungs. Talk with your doctor about how your conditions may influence each other, especially before pregnancy, surgery, or travel to high altitudes, so your care plan stays safe and coordinated.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
History
Throughout history, people have described newborns who tired quickly with feeding, breathed fast, or had bluish lips, long before anyone could see inside the chest to understand why. Community stories often described the condition as a “weak heart” in a baby who struggled to gain weight, and some children improved only slowly as their bodies adapted in their own ways.
From early case notes in the 19th and early 20th centuries, doctors sketched unusual heart and lung findings during autopsies and surgeries, noting that one lung looked underdeveloped and that a main vessel to that lung seemed missing. First described in the medical literature as a rare and puzzling heart–lung anomaly, it was often grouped with other congenital heart differences because there was no easy way to tell them apart in life. As chest X‑rays became common, clinicians began to notice a small lung on one side with fewer visible blood vessels. Later, cardiac catheterization and angiography in the mid‑20th century allowed specialists to trace blood flow and confirm what earlier surgeons had suspected: in some children and adults, there was an absence of the pulmonary artery on one side.
With the spread of echocardiography and, later, CT and MRI, the picture sharpened. Doctors could distinguish people with isolated absence of the pulmonary artery from those who also had other heart conditions. This explained why symptoms varied so much. Some infants had early symptoms of absence of the pulmonary artery, like rapid breathing and poor feeding, while others were not diagnosed until school age or adulthood, when exercise brought on shortness of breath or coughing up blood. Over time, descriptions became more precise, and reports highlighted that the right side is affected more often than the left, and that the condition can appear alone or with other heart differences.
Surgical history also evolved. Early operations focused on relieving high pressure in the remaining lung or managing complications. Later techniques aimed to reconnect or rebuild a pathway to the under‑supplied lung in select children, sometimes using nearby vessels that had grown as natural detours. These advances did not apply to everyone with absence of the pulmonary artery, but they opened options that were not imaginable a generation earlier.
In recent decades, knowledge has built on a long tradition of observation. Awareness grew that some people live for years with mild symptoms and are found incidentally on imaging, while others need early, coordinated care. Today’s understanding reflects many small steps: careful bedside observations, evolving imaging, and incremental surgical innovation. Knowing the condition’s history helps explain why diagnosis and treatment are now tailored to the individual rather than one single pathway for all.