Ventricular septal defect is a congenital heart condition with a hole in the wall between the heart’s two lower chambers. It is often found in babies and children, but a small ventricular septal defect may not be noticed until later in life. Early signs of ventricular septal defect can include poor feeding, fast breathing, tiring with feeds, or slow weight gain, while small defects may cause no obvious problems. Not everyone will have the same experience. Some ventricular septal defect cases close on their own, while others need regular monitoring, medicines to ease heart strain, or a procedure or surgery to repair the hole; severe untreated cases can be life-threatening, but many people do well with proper care.
How many people live with Ventricular septal defect?
Worldwide, about 12 million people were living with heart defects present from birth (Global Burden of Disease Study 2017, 2020). Because ventricular septal defect, a hole in the wall between the heart’s lower chambers, is thought to make up about 20%-30% of these cases, that suggests roughly 2.4-3.6 million people worldwide are living with one, although this is an estimate rather than a direct count and the range changes depending on whether very small defects that later close on their own are counted. In the United States, about 2.4 million people are living with heart defects present from birth (CDC, 2024), which suggests roughly 480,000-720,000 people living with a ventricular septal defect by the same method, again as an estimate rather than a direct count.
Overview
Ventricular septal defectSymptoms
Ventricular septal defect is a hole between the heart’s lower chambers. Small defects may cause no noticeable signs. Larger ventricular septal defects can lead to fast breathing, sweating with feeds, poor weight gain, or getting tired easily.
Outlook and prognosis
For many people with ventricular septal defect, the outlook is very good, especially when the opening is small and closes on its own. Larger ventricular septal defects may need monitoring or repair, but most children grow well and stay active.
Causes and risk factors
Ventricular septal defect usually develops before birth, often without a clear reason. Some cases are linked to genetic changes or chromosome conditions, while family history can raise risk. Maternal diabetes, alcohol use, smoking, or certain infections may also contribute.
Genetic influences
Genetics can matter in ventricular septal defect, especially when it appears with other birth differences or runs in a family. Many cases happen without a clear inherited cause, but genetic changes can raise the chance in some people.
Diagnosis
Diagnosis of ventricular septal defect often starts with a heart murmur or symptoms. Doctors usually confirm it with an echocardiogram, a heart ultrasound. Some people also need an electrocardiogram, chest X-ray, or pulse oxygen check.
Treatment and drugs
Ventricular septal defect treatment depends on hole size and symptoms. Small defects often just need checkups. Larger ventricular septal defects may need medicines for heart strain or a catheter or surgery to close the opening.
Symptoms
Many babies and children with ventricular septal defect have no obvious problems, especially when the opening is small. When the opening is larger, everyday things like feeding, breathing, and gaining weight can become harder because extra blood is flowing to the lungs. Features can vary from person to person and can change over time. Some of the early features of ventricular septal defect show up during feeds, naps, or active play rather than as pain.
Small ventricular septal defects often cause no noticeable problems. The condition may only come to light during a routine exam or heart scan.
A whooshing heart sound, called a murmur, is one of the most common signs of ventricular septal defect. It is heard with a stethoscope and does not always reflect how large the opening is.
A larger VSD can make babies breathe faster or seem to work harder to breathe. You might notice the chest moving more than usual during feeding, crying, or sleep.
Feeding can become hard work, so a baby may suck for a short time, pause often, or fall asleep before finishing. Some also sweat during feeds because the heart and lungs are working harder.
How people usually first notice Ventricular septal defect?
How ventricular septal defect is first noticed depends a lot on the size of the hole in the wall between the heart’s lower chambers. In many babies, the first signs of ventricular septal defect are picked up by a doctor who hears a heart murmur during a routine newborn or infant checkup, while larger defects may be noticed earlier because a baby breathes fast, tires with feeding, sweats during feeds, or is not gaining weight as expected. Some small ventricular septal defects cause no obvious symptoms at first and are only found after that murmur leads to an ultrasound of the heart, called an echocardiogram.
Types of Ventricular septal defect
There are a few well-recognized types of ventricular septal defect, based on where the hole sits in the wall between the heart’s lower chambers. This location can affect how likely the defect is to close on its own, whether nearby heart valves are involved, and how symptoms show up over time. Symptoms don’t always look the same for everyone. In many living with ventricular septal defect, day-to-day symptoms depend at least as much on the size of the hole as on the specific variant.
Perimembranous
This is the most common type of ventricular septal defect and sits near the heart valves. Small defects may cause no obvious symptoms, while larger ones can lead to fast breathing, tiring with feeds, poor growth, or shortness of breath with activity. Because it is close to the aortic valve, this type can sometimes affect that valve over time.
Muscular
This type is found in the thicker, more muscular part of the wall between the ventricles. Many small muscular defects cause few or no symptoms and may close on their own in early childhood. If there are several holes or one larger hole, symptoms can include sweating with feeding, poor weight gain, or getting out of breath more easily.
Inlet
This variant sits lower in the septum, near the area where blood flows in through the tricuspid and mitral valves. It can be part of a broader difference in heart development, so symptoms may be more noticeable early in life if the opening is large. Some may have feeding trouble, slow growth, fast breathing, or signs of heart strain.
Outlet
This type is higher in the septum, near the pathway where blood leaves the heart toward the lungs and body. It may be less likely to close on its own than other variants of ventricular septal defect, and it can affect the nearby aortic valve. For many, this can mean a heart murmur is found first, but larger defects may also cause breathlessness, poor feeding, or repeated chest infections.
Can I slow down the onset of symptoms?
Usually no: because a ventricular septal defect is a hole in the wall between the heart’s lower chambers that is present at birth, there is no proven lifestyle change that can meaningfully delay when symptoms begin. Symptoms depend mostly on how large the hole is, so some people with a small hole may never notice problems, while a larger hole can cause symptoms early; healthy habits like not smoking and keeping up overall heart health are good for the body, but they have not been shown to prevent this defect or reliably delay its symptoms. What can help is regular follow-up with a heart specialist and timely treatment if needed, and staying in care gives the best chance of catching changes early, even though it cannot guarantee symptoms will be delayed.
What genetics can tell you about symptoms
Genetics can sometimes help explain why ventricular septal defects happen and, in some cases, why they come with other health issues, but they usually do not predict day-to-day symptoms very precisely. Many people with a small hole have few or no symptoms, while larger holes are more likely to cause early trouble such as fast breathing, poor feeding, sweating with feeds, or slow weight gain, and some genetic syndromes can make these problems more likely by affecting the heart in several ways at once. In short, genetic findings may give clues about the chance of other heart or body features and the overall pattern of disease, but the size and exact position of the hole often matter more for when symptoms start and how severe they are.
Causes and risk factors
Parents often want to know why ventricular septal defect happened, but in many cases there is no single clear cause. It usually begins very early in pregnancy when the wall between the heart’s lower chambers does not form completely. This can be linked to an inherited or new genetic change, and it is more common in babies with conditions such as Down syndrome. Family history can be one part of the story, but lifestyle and environment add their own chapters. Risk factors for ventricular septal defect include poorly controlled diabetes, rubella during pregnancy, and alcohol, smoking, or certain medicines taken during pregnancy.
What are the most common causes or risk factors?
Most ventricular septal defects, or VSDs, are present at birth and happen when the wall between the heart’s two lower pumping chambers does not fully close while the baby is developing, often for no clear reason. The chance is higher in families with a history of heart defects and in some genetic conditions, such as Down syndrome. Risk can also go up if the pregnant parent has diabetes that is not well controlled, gets certain infections like rubella during pregnancy, or is exposed to alcohol, tobacco, or some medicines early in pregnancy.
Environmental and biological risk factors
Ventricular septal defect usually begins very early in pregnancy, often before someone knows they are pregnant. Doctors often group risks into internal (biological) and external (environmental). Most known risk factors relate to the pregnant parent's health or to exposures during those early weeks. Having one of these factors does not mean a baby will definitely have a ventricular septal defect.
Poorly controlled diabetes before or during early pregnancy raises the chance of congenital heart differences, including ventricular septal defect. High blood sugar during the weeks when the heart is forming can disrupt normal development.
Poorly controlled phenylketonuria, a rare condition that causes high levels of phenylalanine in the blood, can increase the chance of ventricular septal defect and other heart differences. Good control before pregnancy and in early pregnancy can lower this risk.
Rubella during pregnancy is a well-known risk factor for congenital heart defects. The risk is highest when infection happens early, while the baby's heart is still forming.
Some medicines taken in early pregnancy can affect how the baby's heart develops. Examples include retinoid acne medicines and some anti-seizure medicines, so medication review before or early in pregnancy can be important.
Genetic risk factors
Ventricular septal defect can run in families, but many cases happen without one clear inherited cause. When people ask about the genetic causes of ventricular septal defect, the answer is usually a mix of family history, chromosome changes, and, less often, changes in a single gene. Some risk factors are inherited through our genes. Ventricular septal defect is also more common in some genetic syndromes, especially when other birth differences are present.
Family history: Having a parent, sibling, or child with a congenital heart defect can raise the chance of ventricular septal defect in a family. The increase is real, but the overall chance is still often fairly low.
Down syndrome: Ventricular septal defect is more common in babies with Down syndrome, which happens when there is an extra copy of chromosome 21. In this setting, the hole in the heart wall may occur on its own or alongside other heart differences.
22q11.2 deletion: A missing small piece of chromosome 22 can increase the risk of ventricular septal defect and other heart defects. Some people with this condition also have differences affecting the palate, immune system, or learning, but the pattern can vary a lot.
Other chromosome changes: Extra or missing chromosome material, such as in trisomy 13 or trisomy 18, can affect how the heart develops and may lead to ventricular septal defect. These chromosome changes usually happen by chance rather than being passed down through a family.
Single-gene syndromes: Sometimes ventricular septal defect is part of an inherited syndrome caused by a change in one gene. Examples include Noonan syndrome and Holt-Oram syndrome, although not everyone with these conditions has a VSD.
New gene changes: In some families, a gene or chromosome change appears for the first time in the child and was not known in either parent. This can help explain why ventricular septal defect sometimes appears unexpectedly.
Lifestyle risk factors
Ventricular septal defect is usually present from birth, so lifestyle habits do not cause it. However, how lifestyle affects ventricular septal defect can matter for symptoms, heart strain, recovery after repair, and long-term complications. The main lifestyle risk factors for ventricular septal defect relate to activity patterns, nutrition, tobacco exposure, alcohol or drug use, infection prevention habits, and follow-up adherence. Their impact depends on the size of the defect, whether it has been repaired, and whether complications such as pulmonary hypertension or heart failure are present.
Too little activity can reduce exercise capacity and overall cardiovascular fitness in people with ventricular septal defect. On the other hand, intense exertion beyond what a cardiologist recommends may worsen breathlessness, palpitations, or fatigue in those with significant defects or complications.
Excess salt and a calorie-dense diet can worsen fluid retention and make heart failure symptoms more likely when a ventricular septal defect is hemodynamically important. Maintaining a healthy weight can lower the workload on the heart and may improve stamina in daily life.
Smoking and secondhand smoke can increase strain on the heart and lungs, which is especially unhelpful when ventricular septal defect already affects blood flow. Tobacco exposure may also worsen exercise tolerance and recovery after cardiac procedures.
Heavy alcohol use can weaken heart muscle and trigger rhythm problems, adding risk for someone with ventricular septal defect. Stimulant or recreational drug use can sharply raise heart rate and blood pressure, which may aggravate symptoms or complications.
Risk prevention
For most people, a ventricular septal defect cannot be fully prevented because it usually develops very early in pregnancy and often happens without a clear cause. Prevention is more realistic in two ways: lowering the chance of some cases before and during pregnancy, and reducing problems after a ventricular septal defect is diagnosed. Prevention isn’t about perfection, it’s about small steps that add up. If there is a family history, pre-pregnancy counseling can help clarify the risk of having a baby with a ventricular septal defect.
Seeing a doctor before pregnancy can help review family history, medicines, and health conditions that may affect fetal heart development. This is one of the most practical ways to lower the risk of ventricular septal defect during pregnancy, even though not all cases can be prevented.
Taking folic acid before conception and in early pregnancy supports normal early development and may help lower the risk of some birth defects, including some heart defects. Many clinicians advise starting it at least 1 month before pregnancy and continuing through early pregnancy.
Poorly controlled diabetes before or during early pregnancy can raise the chance of congenital heart defects, including ventricular septal defect. Keeping blood sugar in target range before conception and in the first weeks of pregnancy can reduce that risk.
Alcohol, smoking, recreational drugs, and some medicines can interfere with fetal heart formation. Review all prescription drugs, over-the-counter products, and supplements with a clinician before and during pregnancy.
Can you prevent Ventricular septal defect?
Usually, no, a ventricular septal defect, which means a hole in the wall between the heart’s lower chambers, cannot be fully prevented because it often develops before birth for reasons that are not clear. The risk may be lowered by getting good prenatal care, avoiding alcohol, smoking, and recreational drugs during pregnancy, keeping diabetes well controlled, and checking with a doctor before taking medicines while pregnant. These steps can support a baby’s heart development, but they cannot guarantee prevention.
Transmission
Ventricular septal defect is not infectious, so it cannot be caught from someone else through contact, coughing, sex, food, or blood. It develops before birth, when the wall between the heart’s lower chambers does not fully form.
When families ask how ventricular septal defect is inherited, the answer is that it varies: many cases happen for the first time in a child with no family history, while some are linked to inherited gene changes or chromosome conditions. If one parent has a congenital heart defect, including ventricular septal defect, the chance of having a baby with a heart defect is usually higher than average, but the exact risk depends on the family and the underlying cause.
When to test your genes
Genetic testing is worth discussing if a ventricular septal defect appears alongside other birth differences, developmental delay, growth concerns, or a family history of congenital heart disease. Many isolated, small ventricular septal defects do not need genetic testing, but results can guide screening for related conditions and help with future family planning.
Diagnosis
Many people with ventricular septal defect are first evaluated after a heart murmur is heard at a routine newborn, child, or adult checkup, while others come in because of poor feeding, fast breathing, or tiring easily. The diagnosis of ventricular septal defect is usually based on the pattern of exam findings and then confirmed with heart tests, especially an ultrasound of the heart. Getting a diagnosis is often a turning point toward answers and support.
A clinician listens for the typical heart murmur and checks for signs that the heart or lungs are under strain. In babies and children, this can include fast breathing, sweating with feeds, poor weight gain, or an enlarged liver.
A small sensor measures oxygen levels in the blood and can help show whether the defect is affecting circulation. Oxygen levels are often normal in a simple ventricular septal defect, but this test helps look for more complex heart problems.
This ultrasound test is the main way to confirm a ventricular septal defect and see exactly where the hole is. It also shows the size of the defect, the direction of blood flow, and whether heart chambers or lung pressures are being affected.
This test records the heart's electrical activity and can show signs that the heart is working harder than usual. It may be normal in a small defect, but larger defects can cause changes linked to chamber enlargement.
How is Ventricular septal defect diagnosed?
Doctors often first suspect a ventricular septal defect when they hear an unusual heart sound, called a murmur, during a checkup or when a baby has signs like fast breathing, sweating with feeds, or poor weight gain. The main test used to confirm it is an echocardiogram, which is a painless ultrasound scan that shows the hole in the wall between the lower heart chambers and how blood is moving through the heart. Sometimes doctors also use a heart tracing, called an ECG, and a chest X-ray, and genetic testing may be considered only if there are signs of a broader inherited condition.
Stages of Ventricular septal defect
Ventricular septal defect does not have defined progression stages. That is because it is usually a structural heart difference present from birth, and what matters most is the size of the opening, how much extra blood flows to the lungs, and whether symptoms develop rather than a step-by-step worsening pattern. Doctors usually start with a conversation about feeding, growth, breathing, tiring with activity, and any heart murmur, then confirm the diagnosis with an exam and heart tests such as an echocardiogram, which is an ultrasound of the heart. In practice, how ventricular septal defect is diagnosed and monitored depends on age and severity, with some small defects needing regular checkups only, while larger ones need closer follow-up to watch for strain on the heart or lungs.
Outlook and prognosis
The outlook for ventricular septal defect is generally very good, especially for small defects, many of which close on their own in childhood and do not shorten life expectancy. Larger defects can cause heart failure symptoms, poor growth, pulmonary hypertension, or damage to the heart and lungs if not treated, but outcomes are usually excellent with timely monitoring and repair. After successful closure, most children and adults can expect normal growth, activity, and long-term survival, though some need lifelong cardiology follow-up for residual shunts, valve problems, arrhythmias, or pulmonary vascular disease. Mortality is low for isolated ventricular septal defect in settings with access to modern pediatric cardiology and surgery, but the risk rises when there are associated heart defects, severe pulmonary hypertension, or delayed treatment. Prognosis also depends on the size and location of the defect and whether complications such as infective endocarditis develop.
Long-term effects
The long-term effects of ventricular septal defect can be very different from one person to another. Long-term effects vary widely, depending on the size and location of the defect, whether it closes on its own, and whether it was repaired early. For many living with ventricular septal defect, the outlook is often very good, especially with a small defect or successful repair, but some may develop lasting heart and lung complications over time.
Many people with a small ventricular septal defect, or one repaired in time, grow and age with few lasting health problems. In these cases, day-to-day life, school, work, and routine activity are often close to typical.
A larger ventricular septal defect can make the heart work harder for years because extra blood flows through the lungs and back to the heart. Over time, this may lead to an enlarged heart or heart failure, with tiredness, poor feeding in infancy, or getting out of breath more easily.
If a significant defect is not corrected, pressure in the lung blood vessels can rise and become permanent. This can lead to pulmonary hypertension, and in severe cases the blood flow pattern can reverse, causing low oxygen levels and bluish skin or lips.
Some people develop an irregular heartbeat later in life, especially after long-standing heart strain or heart surgery. These rhythm changes may cause palpitations, dizziness, or reduced exercise tolerance.
How is it to live with Ventricular septal defect?
Living with a ventricular septal defect can feel very different from one person to the next. Many with a small defect live full, active lives with few limits and may only need regular checkups, while those with a larger defect can have fatigue, shortness of breath, trouble feeding or gaining weight in infancy, or reduced exercise tolerance until the defect is treated. Daily life may include cardiology visits, medicines for some, and extra attention to growth, activity, or recovery after surgery, and for parents or loved ones this can mean worry, more medical appointments, and added caregiving demands, but with proper follow-up most families learn what to watch for and many children and adults do very well.
Treatment and drugs
Treatment for ventricular septal defect depends mostly on the size of the hole in the wall between the heart’s lower chambers and whether it is causing symptoms like poor feeding, fast breathing, tiredness, or trouble gaining weight. Small ventricular septal defects often close on their own and may only need regular checkups, while larger defects can need treatment to protect the lungs and help the heart work more efficiently. Doctors sometimes recommend a combination of lifestyle changes and drugs, such as medicines that help remove extra fluid, reduce strain on the heart, or support feeding and growth in babies, but medicines do not close the hole itself. If symptoms are significant or there are signs of pressure building in the lungs, treatment may include a catheter-based procedure or open-heart surgery to repair the defect, and many people do very well after this.
Can you cure Ventricular septal defect?
In many people, a ventricular septal defect, which is a hole between the heart’s lower pumping chambers, can close on its own or be fixed with a procedure or surgery, so it can often be effectively corrected. Medicine cannot cure the hole itself, but it can help ease symptoms and support the heart until the hole closes or is repaired. Even after successful treatment, many living with a ventricular septal defect still need regular heart checkups over time.
Non-drug treatment
Living with a ventricular septal defect can mean anything from no day-to-day symptoms to tiring easily with feeds, play, or exercise, depending on the size of the hole and how much extra blood flows to the lungs. Treatment is not always immediate, because some small ventricular septal defects close on their own, while larger ones may need a procedure or surgery to prevent strain on the heart and lungs. For many, treatment begins not at the pharmacy, but with careful follow-up, feeding support, and decisions about the right time for repair. The best plan depends on age, symptoms, and whether there are signs of heart failure, poor growth, or high pressure in the lung blood vessels.
Small ventricular septal defects may only need checkups with a heart specialist and periodic imaging to watch how the opening changes over time. This helps the care team decide whether simple monitoring is enough or whether repair is becoming the safer option.
Babies with a larger ventricular septal defect can burn extra energy during feeding and may tire before taking enough milk or formula. Feeding therapy, higher-calorie nutrition plans, and close weight checks can help support growth while the heart problem is being monitored or prepared for repair.
Many children and adults with a ventricular septal defect can stay active, but exercise advice may need to be tailored if there is shortness of breath, poor stamina, or rhythm problems. Not every approach works the same way, so the safest activity level depends on the size of the defect and how the heart is coping.
Some ventricular septal defects can be closed without open-heart surgery by guiding a device through a blood vessel to seal the opening. This option is only suitable for certain defect types and locations, but it can shorten recovery for the right person.
Your genes may have an impact on how drugs work for you
For people with a ventricular septal defect, medicines are often used to ease strain on the heart or help with symptoms like fast breathing, sweating with feeds, or trouble gaining weight, and most are chosen based on age, size of the hole, and how the heart is coping rather than on genetic testing. Small inherited differences can affect how fast the body breaks down some medicines or how strongly a person responds, so one child may need closer dose changes than another, but this is not usually a major part of care for this condition. In everyday practice, genetic testing to guide medication choice, sometimes called pharmacogenomics, is not routinely used for ventricular septal defect.
Pharmacological treatments
Medicines for ventricular septal defect usually do not close the hole itself, but they can help if extra blood flow is making the heart and lungs work too hard. This often matters most in infants or children with fast breathing, sweating with feeds, poor weight gain, or other signs of heart failure. Some medicines work quickly, while others are used for longer symptom control until the defect gets smaller on its own or is repaired.
Furosemide is the most common medicine used to reduce extra fluid and ease breathing when ventricular septal defect causes heart failure symptoms. Doctors may also use spironolactone or chlorothiazide in some children, especially if swelling, fast breathing, or feeding trouble continues.
Captopril, enalapril, or lisinopril may help the heart pump against less pressure, which can lower strain from a larger ventricular septal defect. They are used more often when there are ongoing signs of heart failure, and blood pressure and kidney function usually need monitoring.
Digoxin may be added when a baby or child still has poor feeding, sweating, or tiring easily despite other treatment. It can help the heart pump more effectively, but the dose must be carefully adjusted because too much can be harmful.
In severe cases, medicines such as dopamine, dobutamine, or milrinone may be given in the hospital if the heart is struggling and symptoms are urgent. These are short-term treatments used with close monitoring, not routine long-term medicines for ventricular septal defect.
Genetic influences
Many families ask whether ventricular septal defect runs in families, especially after a new baby is diagnosed or a relative mentions a similar heart problem. In most cases, ventricular septal defect does not come from one single inherited cause, but genetics can still play an important role in how the heart forms before birth. It’s natural to ask whether family history plays a role. The chance can be higher if a parent, brother, sister, or another close relative was born with a heart defect, and some ventricular septal defects happen as part of a broader genetic condition or because of changes in genes that guide early heart development. Even so, many babies with ventricular septal defect are born into families with no known history, so a genetic link is not always found. If ventricular septal defect appears alongside other birth differences, developmental concerns, or several affected relatives, doctors may suggest genetic counseling and sometimes genetic testing to look more closely at the cause.
Is Ventricular septal defect genetic?
Genetics can matter in ventricular septal defect, especially when it appears with other birth differences or runs in a family. Many cases happen without a clear inherited cause, but genetic changes can raise the chance in some people.
Having a genetic risk is not necessarily a diagnosis
Gene variants are common and a normal part of being human. Most do not directly affect health and simply reflect natural differences among people. For many genes, having a variant associated with a condition suggests a possible link rather than a certain diagnosis, especially when several genes and environmental factors also play a role. In some cases, though, one well-understood variant in a particular gene is enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For many families, the biggest questions after a ventricular septal defect diagnosis are whether a child will need medicine, surgery, or simply careful checkups. Genetics can matter because some people with ventricular septal defect also have an underlying chromosome or gene condition, and that may come with other heart, airway, immune, or growth issues that shape when repair is done and how recovery is planned. This is one of the main ways doctors think about how genetics affect ventricular septal defect treatment. Not every difference in response is genetic, but medicines used when VSD causes symptoms, such as diuretics to remove extra fluid or other drugs that ease strain on the heart, are usually chosen more by the size of the defect, age, heart function, and kidney function than by a routine drug-gene test. In practice, there is no standard pharmacogenetic test that tells doctors which common VSD medicines will work best, though genetic results can still help guide anesthesia, surgery, and screening for related conditions. If genetic testing is suggested, it is usually to look for an associated syndrome or chromosome change so the care plan fits the whole child, not just the heart defect.
Interactions with other conditions
For many living with ventricular septal defect, day-to-day health can depend on whether other heart or lung problems are present too. A larger ventricular septal defect can raise blood flow to the lungs, which over time may lead to high blood pressure in the lungs, called pulmonary hypertension, and that can make shortness of breath, poor exercise tolerance, and fatigue worse. Doctors call it a “comorbidity” when two conditions occur together. Ventricular septal defect may also appear alongside other congenital heart conditions or genetic conditions such as Down syndrome, which can affect symptoms, timing of treatment, and long-term follow-up. In babies and children, repeated chest infections or heart failure can make feeding, growth, and breathing more difficult, while in adults, untreated ventricular septal defect can increase the risk of heart rhythm problems, valve leakage, or infection of the heart lining. Interactions can look very different from person to person, so regular follow-up helps doctors check for related problems early and plan care around the whole picture, not just the hole in the heart.
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.
What other conditions can cause similar symptoms to Ventricular septal defect?
Other heart problems can cause symptoms much like a ventricular septal defect, including a hole in the upper heart chambers, a blood vessel that stays open after birth, and heart valve problems that change how blood flows. In babies and children, lung conditions such as bronchiolitis, pneumonia, or asthma can also lead to fast breathing, trouble feeding, sweating with feeds, or poor weight gain. In adults, other causes of heart failure can also bring on shortness of breath, tiredness, and swelling, so doctors often need a heart ultrasound to tell the difference.
History
For many families, ventricular septal defect has been part of everyday life long before it had a modern medical name. A baby might be born looking well at first, then tire during feeds or breathe faster than expected, while a smaller defect may not be noticed until a doctor hears a heart murmur at a routine visit. These real-life patterns helped doctors gradually recognize that not all “holes in the heart” behaved the same way.
Since the earliest days of medicine, efforts have been made to understand heart defects seen at birth, but ventricular septal defect became clearer as anatomy and heart imaging improved. Earlier doctors could often describe the effects only after severe illness or at autopsy, so mild cases were easy to miss. Over time, descriptions became more accurate, and physicians learned that this opening is in the wall between the heart’s two lower pumping chambers and can range from tiny to large.
A major shift came in the 20th century, when safer surgery, heart catheterization, and later echocardiography allowed doctors to diagnose ventricular septal defect during life rather than only infer it from symptoms. That changed day-to-day care in a practical way: many living with small defects could be monitored without treatment, while babies with larger openings could be identified earlier and helped sooner. In recent decades, awareness has grown that some ventricular septal defects close on their own, especially small ones, while others need medication, a procedure, or surgery.
Today, the history of ventricular septal defect is closely tied to the broader progress of congenital heart care. What was once often recognized only after serious symptoms can now be found before or soon after birth, sometimes even during pregnancy. Knowing this history also helps explain why the early symptoms of ventricular septal defect can vary so much from one child to another, and why modern treatment is far more precise and reassuring than it was in the past.