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Descriptions of Congenital Heart Defects
You've probably run across an abbreviation for a Congenital Heart Defect that
you were unfamiliar with. This list is an attempt to gather in one place as
many of the recognized CHDs as we can, with their abbreviations and a laymans
explanation of what they are. This list was created by searching the internet
for sites about CHDs and then simplifying and combining all the information
into one page. This list was NOT created by a doctor, and is for
informational purposes only.
Click on the name of the defect to go to the description.
For more information, you might also want to try checking out the Healthopedia
Aortic stenosis is a narrowing of the aortic valve or a narrowing of the aorta
directly above (supravalvar) or below (subaortic) the aortic valve. Normally,
oxygen-rich blood is pumped from the left ventricle, through the aortic valve,
into the aorta and then out to the body. With aortic stenosis, it makes it
very hard for the heart to pump blood to the body. Depending on the severity
of the stenosis, open heart surgery may be needed to correct the defect.
Another option may be a balloon valvuloplasty.
Subaortic stenosis refers to a narrowing of the left ventricle just below the
aortic valve, which blood passes through to go into the aorta. This stenosis
limits the flow of blood out of the left ventricle. This condition may be
congenital or may be due to a particular form of cardiomyopathy known as
"idiopathic hypertrophic subaortic stenosis" (IHSS).
Supravalvular aortic stenosis (SVAS) is a congenital narrowing of the
ascending aorta which can occur as a congenital defect itself or as one
component of Williams syndrome.
Congenital aortic stenosis occurs in 3 to 6 percent of all children with
congenital heart defects. Relatively few children are symptomatic in infancy,
but the incidence of problems increases sharply in adulthood. Congenital
aortic stenosis occurs four times more often in boys than in girls.
Atrial Septal Defect
The septum is the wall that separates the right and left sides of the heart. A
hole in the wall between the two upper chambers is called an atrial septal
defect, or ASD. This is one of the least complex forms of congenital heart
defect, and was one of the first types to be repaired surgically. Normally,
low-oxygen blood entering the right side of the heart stays on the right side,
and oxygen-rich blood stays on the left side of the heart, where it is then
pumped to the body. When a defect or "hole" is present between the atria (or
upper chambers), some oxygen-rich blood leaks back to the right side of the
heart. It then goes back to the lungs even though it is already rich in
oxygen. Because of this, there is a significant increase in the blood that
goes to the lungs.
There are three different kinds of ASDs. The most common form of ASD is the
secundum defect which usually occurs as an isolated defect. The primum ASD is
associated with a cleft in the mitral valve which may also causing the valve
to leak. The third kind of ASD is the sinus venosus defect, located in the
superior portion of the atrial septum and typically associated with abnormal
drainage of the right upper pulmonary vein.
Atrial septal defects can vary greatly in size. Some ASDs will close on their
own and no surgery is needed. Some ASDs are closed in the catheterization lab
and do not require
open-heart surgery. Certain devices such as the Amplatzer Occluder, the
CardioSEAL, Helex, and Clamshell Device are currently being used or have been
used in the past. Some ASDs will need to be corrected with open heart surgery
to restore normal blood circulation and/or to repair subsequent damage which
has occurred in the heart. Many ASDs are not detected until adulthood. Left
untreated for decades, potential problems include lung disease, exercise
intolerance, heart rhythm abnormalities, shortened life expectancy and the
increased risk of a stroke.
Atrial septal defects occur in 5 to 10 percent of all children born with
congenital heart disease. For unknown reasons, girls have atrial septal
defects twice as often as boys.
Atrioventricular Septal Defect
(also known as atrioventricular canal defect, or AV canal)
This complex defect is best described as a large hole in the middle of the
heart. It results from a lack of separation of the atria and the ventricles
into separate chambers, and a lack of separation of the mitral and tricuspid
valves into two separate valves. This results in a large connection between
the two atria, between the two ventricles, and a single atrioventricular (or
AV) valve where there should be separate mitral and tricuspid valves. In the
most complex form of this defect, not only are there holes between the atria,
the ventricles, and the mitral/tricuspid valves, one of the ventricles may not
be properly formed, the valves may be 'over-riding' or 'straddling', or there
may be an obstruction to the aorta. Because of the large amount of extra blood
going to the lungs (through the septal defects), high blood pressure may occur
and over time this can damage the blood vessels. In addition, the valve
between the upper (atrial) and lower (ventricular) chambers might not close
properly. Blood then leaks backward from the ventricular chambers to the
atrial chambers. This leak is referred to as regurgitation or insufficiency
of the valve. When the valve leaks, the heart has to pump more blood. This
can lead to enlargement of the heart.
This defect is usually corrected in infancy with open heart surgery to restore
normal blood circulation through the heart. Surgical repair consists of
separation of the common AV valve into two valves, along with closure of the
VSD and ASD. Some children, however, may have too complex a defect to correct
in infancy, and would initially require a pulmonary artery banding. This will
decrease blood flow and reduce the high pressure in the lungs. When the child
is older, the band will be removed and the defect corrected with open heart
Atrioventricular canal occurs in two out of every 10,000 live births, and
equally in boys and girls.
Bicuspid aortic valve
The normal aortic valve has three flaps (cusps) that open and close. A
bicuspid valve has only two cusps. There may be no symptoms in childhood, but
by adulthood (often middle age or older), the valve can become narrowed, making
it harder for blood to pass through it, or it may start allowing blood to leak
backward through it. Treatment depends on how well the valve works.
Bicuspid aortic valve is the most common congenital cardiac anomaly occurring
in 1-2% of the population with males affected 4 times more frequently than
DCRV: Double (or Dual) Chamber Right Ventricle
DCRV is a rare defect (0.5 - 2% CHD patients have this one) where there is,
basically, extra muscle in the right ventricle that causes it to function as 2
ventricles. It almost always presents with a VSD. See
for more information.
Complete heart block
(complete AV block)
In this defect, the heart's electrical signal doesn't pass from the heart's
own natural pacemaker in the atrium to the lower chambers. When this occurs,
an independent pacemaker in the lower chambers takes over. The ventricles can
contract and pump blood, but at a slower rate than the atrial pacemaker.
Complete heart block is most often caused in adults by heart disease or as a
side effect of drug toxicity. Heart block also can be present at birth. This
is called congenital heart block. It also may result from an injury to the
electrical conduction system during heart surgery. When the pacemaker in the
ventricles isn't fast enough or reliable enough, an artificial pacemaker is
put in. Heart block can be of varying degrees:
Congenital heart block, when detected at or before birth in a structurally
normal heart, is strongly associated with autoantibodies reactive with certain
proteins. To read more about this condition and possibly take part in the
National Research Registry for Neonatal Lupus, click here:
First-degree heart block, or first-degree AV block, is when the electrical
impulse moves through the AV node more slowly than normal. The time it
takes for the impulse to get from the atria to the ventricles should be less
than about 0.2 seconds. If it takes longer than this, it's called
first-degree heart block. Heart rate and rhythm are normal, and there may
be nothing wrong with the heart. Certain heart medicines such as digitalis
can slow conduction of the impulse from the atria to the ventricles and
cause first-degree AV block.
In second-degree heart block, some signals from the atria don't reach the
ventricles. This causes "dropped beats."
In third-degree or complete heart block, no signal passes from the atria to
the ventricles. This requires a pacemaker.
Congenitally Corrected Transposition of the Great Arteries
In this congenital heart defect the ventricles are switched so that the left
ventricle pumps blood to the lungs, and the right ventricle pumps blood out the
aorta. In this defect, the position of the two ventricles is reversed so that
the right atrium enters the left ventricle, and the left atrium enters the
right ventricle. With this arrangement blood is flowing through the wrong
ventricles, but it is still going in the correct direction, hence the term
"congenitally corrected transposition". This defect is commonly associated
with ventricular septal defect, pulmonic stenosis, heart block and an
Ebstein-like malformation of the tricuspid valve. The normal right ventricle
pumps blood to the lungs at a low pressure (about 25 mmHg). The left
ventricle, pumping blood to the body, pumps at whatever pressure your blood
pressure is (about 120 mmHg). With time, since the right ventricle is not
built to pump to such a high pressure as the left ventricle, it may weaken,
dilate, and cause symptoms.
This is an uncommon defect occurring in less than 1% of all people with
congenital heart defects. Many people with this defect may live into
adulthood before the defect is diagnosed and before symptoms occur.
Coarctation of the Aorta
The aorta is the main artery that sends oxygen-rich blood from the heart to
the body. Coarctation of the aorta is a constricted segment of the aorta that
obstructs blood flow to the body. The left ventricle has to pump harder
because the pressure is high. Because of this, the heart may enlarge.
Coarctations most often occur as isolated defects, but may occur with a
ventricular septal defect, subaortic stenosis, or complex congenital heart
defects. Surgery may be needed to correct the defect, depending on the
severity of the coarctation and the presence of other congenital defects.
Another option may be a balloon angioplasty.
Coarctation of the aorta occurs in about 6 to 8 percent of all children with
congenital heart disease. Boys have the defect twice as often as girls do.
Coronary Artery Abnormality
Left coronary artery attached to the right side of the heart along with the
right coronary artery. For more information see
at the University of Washington.
Dextrocardia litterally means "heart on the right". If the developing heart
tube bends to the left instead of the right, then the heart is displaced to the
right and develops in a mirror image of its normal state. It is interesting to
note that identical twins are sometimes "mirror images" of each other, one
having organs in the normal positions and one having them on the opposite side
of the body. This is a condition called situs inversus.
Having dextrocardia does not mean the heart is defective, it just means that
it is on the right instead of the left side of the body. Assuming there are no
associated vascular abnormalities, then the heart functions normally.
In cases where the heart is the only organ which is transposed, known as
isolated dextrocardia, there are usually other severe cardiac abnormalities.
Dextrocardia can complicate heart defect treatments in that it can make surgery
even more difficult, and heart transplants for patients with dextrocardia are
more difficult since the anatomy of the donor and recipient don't match.
DiGeorge syndrome is a complex birth defect. In most cases there is a
chromosomal defect on chromosome 22. DiGeorge consists of a particular group
of symptoms frequently occurring together, including the following:
In the 1980s, the technology was developed to identify underlying chromosome
defects of three similar syndromes. It was determined that over 90 percent of
all patients with features of DiGeorge, Shprintzen, and velo-cardio-facial
syndromes had a chromosome deletion in the region of 22q11. In other words,
this was the same syndrome, but because several different researchers in
different areas of expertise had described it, the syndrome carried multiple
names. Many physicians and researchers today use the term 22q11 deletion
syndrome because it describes the underlying chromosome problem, or
velo-cardio-facial syndrome (VCFS) because it describes the main body systems
hypoparathyroidism (underactive parathyroid gland), which results in
hypocalcemia (low blood calcium levels)
hypoplastic (underdeveloped) thymus or absent thymus, which results in
problems in the immune system
conotruncal heart defects (i.e., tetralogy of Fallot, interrupted aortic
arch, ventricular septal defects, vascular rings)
cleft lip and/or palate
Statistically, patients with DiGeorge have the following:
Approximately 10 percent of individuals who have the features
velo-cardio-facial syndrome (VCFS) do not have a deletion in the chromosome
22q11 region. Other chromosome defects have been associated with these
features, as have maternal diabetes, fetal alcohol syndrome, and prenatal
exposure to AccutaneŽ (a medication for cystic acne).
69 percent have palatal abnormalities (such as cleft lip and/or palate)
30 percent have feeding difficulties
80 percent have conotruncal heart defects (i.e., tetralogy of Fallot,
interrupted aortic arch, ventricular septal defects, vascular rings)
40 percent have hearing loss or abnormal ear exams
30 percent have genitourinary anomalies (absent or malformed kidney)
60 percent have hypocalcemia (low blood calcium levels)
40 percent have microcephaly (small head)
40 percent have mental retardation (usually borderline to mild)
IQs are generally in the 70 to 90 range
33 percent of adults have psychiatric disorders (i.e., schizophrenia,
2 percent have severe immunologic dysfunction (an immune system which does
not work properly due to abnormal T-cells, causing frequent infections)
Double Aortic Arch
The ascending aorta splits into 2 "arches" which pass to the right and left
of the trachea and esophagus. The two arches rejoin behind the esophagus to
form the descending aorta. There are two types:
Type 1 has both arches open and functioning and this type is the most
Type 2 has both arches intact but one is very narrow, usually the left.
Double Outlet Right Ventricle
Normally, a ventricle has just ONE outlet. For the left ventricle, this is
the aorta. For the right ventricle it is the pulmonary artery. In DORV, both
of these "outlet" blood vessels - aorta and pulmonary artery -arise from the
RIGHT VENTRICLE, either totally or to a great extent. Most cases of DORV have
a VSD. DORV is classified based on the relationship between the VSD and the
blood vessels. If the VSD is right under the aorta, it is called DORV with
Sub-Aortic VSD. If it lies under the pulmonary artery, it becomes DORV with
Sub-Pulmonary VSD - also called the TAUSSIG-BING anomaly. If the VSD is under
both the arteries, it is called DORV with Doubly Committed VSD. Sometimes, the
VSD is farther away from the arteries, and is known as DORV with Non-Committed
VSD. When in addition to this, there is narrowing of the pulmonary valve
(Pulmonary Stenosis), the condition is similar to Tetralogy of Fallot (ToF).
If the VSD is below the pulmonary valve, the features are just like those of
Transposition of Great Arteries (TGA). When the VSD is doubly committed or non
committed, clinical features are variable.
This defect is a downward displacement of the tricuspid valve (located
between the heart's upper and lower chambers on the right side) into the
heart's right bottom chamber (or right ventricle). It's usually associated
with an atrial septal defect. While there is free flow of blood forward across
the tricuspid valve to the right ventricle, the deformed tricuspid valve
allows a large amount of blood to flow backwards from the right ventricle to
right atrium when the right ventricle contracts. About 10% of cases are
associated with chronic maternal lithium use. The treatment of this disorder
depends on whether or not the person with it has any symptoms. Surgery is
sometimes required early in life. On the other hand, people may have a normal
life expectancy. Irregular and fast heartbeats (arrhythmia) frequently
accompany this condition.
See the following links for more information:
HeartPoint: Ebstein's Anomaly
Children's Heart Institute | Heart Defects: Ebsstein's Anomaly
Ebstein's Anomaly, Cincinnati Childrens Hospital
Endocardial Fibroelastosis is a rare heart disorder that affects infants and
children. It is characterized by an abnormal thickening of heart tissue,
especially around the valves, causing abnormal enlargement of the heart
(cardiac hypertrophy), especially affecting the left ventricle. Impaired heart
and lung function can eventually lead to congestive heart failure. It can
cause valve failure and sudden death. Endocardial Fibroelastosis may occur for
no apparent reason (sporadic) or may be inherited as an X-linked or autosomal
recessive genetic trait.
Eisenmenger's complex is a ventricular septal defect combined with pulmonary
high blood pressure, the passage of blood from the right side of the heart to
the left (right to left shunt) and an enlarged right ventricle. It may also
include a malpositioned aorta that receives blood from both the right and left
ventricles (an overriding aorta). Without early surgical correction of the
underlying defect, such changes may cause progressive damage small blood
vessels in lung tissue (pulmonary vascular disease).
Disorder characterized by distinctive malformations of the bones of the
thumbs and forearms (upper limbs) and/or abnormalities of the heart.
(HCM, HOCM, IHSS)
The main feature of Hypertrophic Cardiomyopathy is an excessive thickening of
the heart muscle. Heart muscle may thicken in normal individuals as a result
of high blood pressure or prolonged athletic training. In Hypertrophic
Cardiomyopathy (HCM), however, the muscle thickening occurs without an obvious
cause. The condition has been known by a number of other names including
"hypertrophic obstructive cardiomyopathy" (HOCM), "idiopathic hypertrophic
sub-aortic stenosis" (IHSS) and "muscular sub-aortic stenosis" The general term
"hypertrophic cardiomyopathy" is now the most widely used and recommended.
Cardiomyopathy differs from many of the other disorders of the heart in several
ways, including the following:
The Cardiomyopathy Association
for more information.
Cardiomyopathy can, and often does, occur in the young.
The condition is fairly uncommon, affecting only about 50,000 Americans
(adults and children).
Cardiomyopathy is a leading cause for heart transplantation.
The condition tends to be progressive and sometimes worsens fairly quickly.
It may be associated with diseases involving other organs, as well as the
Hypoplastic Left Heart syndrome
Hypoplastic left heart syndrome, or HLHS for short, means that the left side
of the heart did not develop normally. Therefore, the mitral and aortic valves
are usually tiny or absent, as are the the left ventricle and the first part of
the aorta. Perhaps the most critical defect in HLHS is the small,
underdeveloped left ventricle. In a normal heart, this chamber is very strong
and muscular so it can pump blood to the body. When the chamber is small and
poorly developed, it will not function effectively and cannot provide enough
bloodflow to meet the body's needs. For this reason, an infant with HLHS will
not live long without surgical intervention. Parents are given a number of
options depending on when the diagnosis is made potentially including --
abortion of the fetus, compassionate care (no surgical intervention which
results in the baby passing away usually within the first two weeks of life)
or one of a number of surgical option.
There are two, possibly three, surgical options; one is cardiac
transplantation, in which the heart is replaced by a donated heart,; another
is a 3-staged surgical procedure and the last surgical option is only
available for a subset of HLHS patients and is called a biventricular repair.
The three-step procedure is called "the Norwood" because the first operation
is called the Norwood Procedure. The Norwood is done very soon after birth,
usually within the first few days of life. The second step is called the
hemi-Fontan (which is frequently a bi-directional Glenn operation). It sends
half of the blood returning from the body to the lungs, reducing the workload
on the heart. This second step is part of the preparation to transform the
HLHS heart into a two-chamber pumping heart which will only function to pump
blood to the body (after the third operation, all of the blood will travel
passively to the lungs). The third operation is called the Fontan operation.
In this operation, the other half of the blood returning from the body to the
heart is sent instead to the lungs. In what used to be a uniformly fatal
disease, consider the following statistics from the very best facilities
These statistics are not representative of EVERY facility treating HLHS, so it
is imperative parents ask their children's doctors for information BEFORE a
treatment facility is chosen -- if there is time. This is one of the
advantages of finding out about the HLHS diagnosis in utero.
Survival following a Norwood operation is around 80%
Survival following a bi-directional Glenn operation is around 100%
Survival following a Fontan operation is around 95%
Overall, survival at 5 years of age is around 70 - 75%
Most patients who get through the three stages do quite well. They are able to
lead a fairly normal life with few restrictions. Most patients have to be on
some kind of anticoagulant (like baby aspirin), many need Digoxin, some kind
of diuretic (at least for some time post-operatively) and/or medications to
control blood pressure. Of course they have to take antibiotics
prophylactically, as do other children with severe, congenital heart defects.
The biventricular repair is only available for a small subset of HLHS infants
whose left ventricle is small, but not too small. The biventricular repair is
actually a series of operations which must be performed in stages, like the
Norwood Procedure; however, instead of converting the heart into a two-chamber
pumping heart, the bi-ventricular repair encourages growth of the small left
ventricle so that ultimately the child will have a fully functional,
four-chamber pumping heart. Not as many facilities have experience performing
this fairly new procedure, so some research on the part of the parents may be
needed to find the ideal facility for their child.
Hypoplastic left heart syndrome occurs in up to four out of every 10,000 live
births. It is one of the top three heart abnormalities to cause problems in
the newborn. HLHS occurs slightly more often in boys than in girls.
Hypoplastic Right Heart Disease
This defect consists of a complete obstruction of the right ventricle outflow
tract due to a hypoplastic (narrowed) pulmonary artery. When the ventricular
septum is intact the PDA and / or bronchial collateral arteries provide the
only source of pulmonary blood flow. There are two types of this defect: A
small right ventricle with a thick wall and a small but working tricuspid
valve. This is the most common. The other type is to have a normal right
ventricle with a complete but malfunctioning tricuspid valve.
Interupted Aortic Arch
In this defect, part of the aorta is absent and this leads to severe
obstruction to blood flow to the lower part of the body. In the immediate
newborn period blood flows through the ductus into the descending aorta and
reaches the lower part of the body. As the ductus closes after birth, blood
pressure in the lower circulation becomes inadequate and severe symptoms
develop. Most affected infants develop severe symptoms (difficulty breathing
and impaired kidney function) in the first week of life and need urgent
Isolated Non-Compaction of Left Ventricular Myocardium
The left ventricle is made up of embryonic tissue that stopped developing
completely in gestation and never finished "forming."
Kawasaki disease is the most common form of vasculitis that primarily affects
children. The disease produces irritation and inflammation of many tissues of
the body including the hands, feet, whites of the eyes, mouth, lips, and
throat. High fever and swelling of the lymph nodes in the neck also are
characteristic of this illness. The inflammation is uncomfortable, but
resolves with time. However, the main threat from Kawasaki disease comes from
its effect on the heart and blood vessels. Heart-related complications can be
temporary or may affect the child long-term. The heart, particularly the
coronary arteries, is affected in as many as 20 percent of children with
Kawasaki disease. Another name for Kawasaki disease is mucocutaneous lymph
Kawasaki disease is fairly common in the US. According to the American Heart
Association, the illness is a major cause of heart disease in children. About
1,800 new cases are diagnosed in the US each year, and the incidence is on the
rise. Kawasaki disease has replaced acute rheumatic fever as the leading
cause of acquired heart disease in children in the US and Japan.
Kawasaki disease occurs more often in Japan than in any other country. In the
US, children of Asian or Asian-American heritage are affected more often than
other races, although Kawasaki disease can occur in any racial or ethnic
group. The vast majority of children who develop Kawasaki disease are under
age 5. The average age child seen with the illness is 2 years old. It occurs
in boys twice as often as in girls.
Left Ventricular Outflow Tract Obstruction
This defect consists of having both atrio-ventricular and ventriculo-arterial
connections. Note that neither hypertrophic cardiomyopathy nor interrupted
aortic arch are considered here.
Left ventricular outflow tract obstruction (LVOTO) can occur at several
The occurrence of subvalvar LVOTO, coarctation and mitral stenosis (parachute
mitral valve and supramitral ring) is known as Shone's syndrome.
LVOTO seldom occurs in isolation: it is usually part of Williams syndrome.
LVOTO in the adult patient with congenital heart disease is usually due to
bicuspid aortic valve. Bicuspid aortic valve is the most common congenital
cardiac anomaly occurring in 1-2% of the population with males affected 4
times more frequently than females. It usually occurs in isolation but is
associated with other abnormalities in 20% of the cases, the most common
being coarctation of the aorta and PDA.
LVOTO is usually a ridge partially or completely encircling the left
ventricular outflow tract or a long narrowing beneath the base of the aortic
valve. Occasionally, there is a tunnel-like narrowing of the whole left
ventricular outflow tract with a small aortic root. This type of defect
affects males twice as often as females. Family members may be affected.
Rarely, abnormal insertion of the mitral valve or accessory mitral leaflet
may cause significant obstruction.
LONG QT syndrome
Long QT syndrome (LQTS) is an abnormality of the heart's electrical system.
The mechanical function of the heart is entirely normal. The electrical
problem is due to defects in heart muscle cell structures called ion channels.
These electrical defects predispose affected persons to a very fast heart
rhythm (arrhythmia) called torsade de pointes which leads to sudden loss of
consciousness (syncope) and may cause sudden cardiac death.
Children with Marfan syndrome are at risk for serious problems involving the
cardiovascular system, including the following:
A deficiency of fibrillin in connective tissue creates the abnormalities in
organs and body structures that may be seen with Marfan syndrome. Other
symptoms may be noted that contribute to the certainty of the diagnosis. Each
child may experience symptoms differently. Non-heart related symptoms may
mitral valve prolapse - an abnormality of the valve between the left atrium
and left ventricle of the heart that causes backward flow of blood from the
left ventricle into the left atrium.
arrhythmia (or disrhythmia) - a fast, slow, or irregular heartbeat.
aortic regurgitation - backwards leakage of blood from the aorta, through a
weakened aortic valve, and into the left ventricle, resulting in stress in
the left heart and inadequate blood flow to the body.
aortic dissection - weakening of the layers inside the aorta, which can
result in tears in the aortic wall and leakage of blood into the chest or
abdomen; a medical emergency.
deformities of the breastbone
scoliosis - a sideways curvature and rotation of the vertebrae, giving the
appearance that the person is leaning to one side.
misalignment of certain bones
unusual arm span
long fingers and toes
dislocation of the lens in the eye
Marfan Association UK
for more information.
Major Aorta/Pulmonary Collateral Arteries
Direct connections (natural shunts) from the aortic system (red blood) to
Mitral Valve Proplaspe
Located in the heart between the left atrium (upper chamber) and left
ventricle (lower chamber), the mitral valve consists of two flaps or leaflets,
which normally open and shut in coordinated fashion to allow blood to flow
only in one direction -- from the atrium to the ventricle. In patients with
MVP, one or both of the flaps are enlarged, and the leaflets' supporting
muscles are too long. Instead of closing evenly, one or both of the flaps
collapse or bulge into the atrium, sometimes allowing blood to flow backwards
into the atrium. The condition produces a distinctive "clicking" sound that
can be heard when listening to the heart with a stethoscope.
This defect is very common in its mild form, and requires minimal medical
attention. In the severe form, it usually leads to heart failure and requires
surgical repair or replacement of the mitral valve. Occasionally, MVP leads to
a condition known as mitral regurgitation or insufficiency. This means a
large amount of blood is leaking backward through the defective valve instead
of continuing in the normal direction. Mitral regurgitation can result in the
thickening or enlargement of the heart wall, caused by the extra pumping the
heart must do to compensate for the backflow of blood. Mitral regurgitation
sometimes causes fatigue or shortness of breath. The condition can usually be
treated with medication, but a few people require surgery to repair or replace
the defective valve.
Although MVP affects 5% to 7% of the population, the cause is unknown. Mitral
valve prolapse occurs more often in women than men; it often occurs in people
who have no other heart problems, and the condition may be inherited.
Noonan syndrome is a genetic condition that affects the heart, growth, blood
clotting, and mental and physical development. The children affected may have
no obvious signs to the onlooker, but the problems may be many and complex
with no clinical test available. Affected individuals may have behavior
problems, learning difficulties and many other anomalies, including a
distinctive facial appearance; a broad or webbed neck; a low hairline in the
back of the head; and short stature. Characteristic abnormalities of the head
and facial area may include widely set eyes; vertical skin folds that may
cover the eyes' inner corners; drooping of the upper eyelids; a small jaw; a
low nasal bridge; and low-set, prominent, abnormally rotated ears.
Distinctive skeletal malformations are also typically present, such as
abnormalities of the breastbone (sternum), curvature of the spine (kyphosis
and/or scoliosis), and outward deviation of the elbows. Many infants with
Noonan syndrome also have heart defects, such as obstruction of proper blood
flow from the lower right chamber of the heart to the lungs (pulmonary
valvular stenosis). Additional abnormalities may include malformations of
certain blood and lymph vessels, blood clotting and platelet deficiencies,
mild mental retardation, and/or other symptoms.
In some affected individuals, Noonan syndrome appears to result from
spontaneous genetic mutations. In others, the disorder may be transmitted as
an autosomal dominant trait. Genetic analysis suggests that the disorder may
result from mutations of a gene located on the long arm (q) of chromosome 12
Partially Anomalous Pulmonary Venous Return
This defect is associated with ASD and is also associated with hypogenetic
lung (scimitar syndrome). The defect is almost exclusively right-sided. In
almost all instances, the anomalous vein is a pulmonary vein. It usually
drains into the infradiaphragmatic IVC. Less commonly drainage is to hepatic,
portal or azygous veins, the coronary sinus or right atrium. Occasionally,
the PAPVR drains to the left atrium ("meandering pulmonary vein"). In many
cases of scimitar syndrome, part of the right lung receives arterial blood
supply from the descending thoracic aorta or upper abdominal aorta.
Patent Ductus Arteriosus
A PDA, or patent ductus arteriosus, is a connection (called the ductus
arteriosus) between the aorta and the pulmonary artery that doesn't close off
after the baby is born. In utero, the baby depends on the ductus to get
oxygen from the mother, since the lungs are not working (the baby doesn't
breathe in utero). When the baby is born, there are hormonal changes in the
baby that normally close off the ductus, since the baby is now breathing and
no longer needs it. If the ductus remains open, it may cause an excessive
amount of blood to go to the lungs. Depending on the size of the PDA and the
condition on the lungs, the baby may have no symptoms, or be in severe heart
failure. Patent ductus arteriosus is often closed in the cardiac
catheterization laboratory by the insertion of specially designed coils.
These coils sit in the PDA and expand to the point where they block all the
Patent ductus arteriosus is the sixth most common congenital heart defect,
occurring in 5 to10 percent of all children with congenital heart disease.
Patent ductus arteriosus occurs twice as often in girls as in boys.
No pulmonary valve exists, so blood can't flow from the right ventricle into
the pulmonary artery and on to the lungs. The right ventricle acts as a blind
pouch that may stay small and not well developed. The tricuspid valve is
often poorly developed, too. An opening in the atrial septum lets blood exit
the right atrium, so venous (bluish) blood mixes with the oxygen-rich (red)
blood in the left atrium. The left ventricle pumps this mixture of blood into
the aorta and out to the body. The only source of lung blood flow is the
patent ductus arteriosus (PDA), an open passageway between the pulmonary
artery and the aorta. If the PDA narrows or closes, the lung blood flow is
reduced to critically low levels. This can cause very severe cyanosis. Early
treatment often includes using a drug to keep the PDA from closing. A surgeon
can create a shunt between the aorta and the pulmonary artery to help increase
blood flow to the lungs. A more complete repair depends on the size of the
pulmonary artery and right ventricle. If they are very small, it may not be
possible to correct the defect with surgery. In cases where the pulmonary
artery and right ventricle are a more normal size, open-heart surgery may
produce a good improvement in how the heart works. If the right ventricle
stays too small to be a good pumping chamber, the surgeon can compensate by
connecting the right atrium directly to the pulmonary artery. The atrial
defect also can be closed to relieve the cyanosis.
Pulmonary atresia occurs in about one out of every 10,000 live births.
Pulmonary stenosis is a narrowing of the pulmonary valve. Normally the
pulmonary valve opens to let low-oxygen blood flow from the right ventricle to
the lungs where the blood is oxygenated. Because of the narrowing, the right
ventricle has to pump harder to get past the stenotic valve. This can
sometimes lead to enlargement of the right ventricle. With pulmonary
stenosis, problems with the pulmonary valve make it harder for the leaflets to
open and permit blood to flow forward from the right ventricle to the lungs.
In children, these problems can include:
Depending on the severity of the pulmonary stenosis, open heart surgery may be
needed to correct the defect. Another option may be a balloon valvuloplasty.
This procedure is done in the cardiac catheterization lab.
a valve that only has one or two leaflets instead of three.
a valve that has leaflets that are partially fused together.
a valve that has thick leaflets that do not open all the way.
Pulmonary stenosis is the second most common congenital heart defect,
comprising 5 to 10 percent of all cases. It is a component of half of all
complex congenital heart defects.
Right Ventricular Outflow Tract Obstruction
Right ventricular outflow tract obstruction (RVOTO) can occur at any level.
RVOTO seldom occurs alone. It may occur as part of Tetralogy of Fallot,
Williams syndrome, Noonan syndrome or in combination with an ASD.
RVOTO, the most common form of RVOTO, is caused by stenosis of the pulmonic
valve. It is almost always congenital in origin.
RVOTO usually occurs in combination with other defects, particularly VSD and
Tetralogy of Fallot.
RVOTO (either valvar or subvalvar) may occur in association with subaortic
While the normal heart has two ventricles, in some birth defects, one of
these ventricles may be absent or poorly developed. This condition is called
single ventricle or univentricular heart. This can include such problems as
tricuspid valve atresia, hypoplastic left-heart syndrome, hypoplastic
right-heart syndrome (pulmonary atresia with intact ventricular septum),
mitral valve atresia, and double-inlet ventricle. Other types of heart
defects, such as atrioventricular canal defects or double outlet right
ventricle, may be complicated by an underdeveloped ventricle. The ventricular
structure may resemble the normal left ventricle or the normal right ventricle.
Sometimes it resembles neither, and this is called indeterminate ventricle
morphology. Single-ventricle defects are among the most complex congenital
heart problems known
In a single ventricle heart, there are two normal atria. These open into the
ventricle through an atrio-ventricular (AV) valve. There might be two AV
valves, both opening into the ventricle - a condition called Double Inlet
Ventricle, or there may be one AV valve only, the other one being absent
(atretic). The single ventricle connects with the aorta and pulmonary artery.
These two great arteries may be normal or interchanged in position. Some
patients have obstruction of the great arteries - pulmonary stenosis and
The main problem with a single ventricle is the mixing of blood inside the
ventricular chamber. Unoxygenated blood from the veins enters the right atrium
and from there reaches the single ventricle. Oxygenated blood returning from
the lungs flows into the left atrium and into the single ventricle. Inside the
ventricle, both mix together. From here, the mixed blood flows into the aorta
and pulmonary artery.
Patients with single-ventricle defects often need multiple operations. These
include shunts such as Blalock-Taussig (B-T) or Glenn, placing a band on the
pulmonary artery, or the Fontan operation. The Fontan operation largely
separates the heart into two circulations. This lets oxygen-poor blood go to
the lungs and oxygen-rich blood go to the body. The Fontan operation
substantially reduces the mixing of blue and red blood and produces a normal
or near-normal oxygen supply to the body. It also reduces the risk of a
stroke or other complications, and decreases the workload on the single
ventricle. A Fontan operation can't be done if you have pulmonary hypertension
(high blood pressure in the lungs).
Tetralogy of Fallot
Tetralogy of Fallot is one of the most common forms of complex congenital
heart defects that causes cyanosis, or a blue baby. Tetralogy of Fallot is
comprised of four separate components.
The ventricular septal defect is usually large and blood flows from the right
ventricle through this VSD into the left ventricle. This occurs because of
the resistance of blood flow through the pulmonary valve. Once the blood flows
into the left ventricle, it is ejected into the aorta and delivers
de-oxygenated blood into the body. Because there is de-oxygenated blood being
delivered to the body, these babies may appear cyanotic, or "blue". Open
heart surgery is needed to correct this defect.
The first one is a ventricular septal defect (VSD).
The second one is pulmonary stenosis (PS).
The third component is right ventricular hypertrophy, which is an increase
in the size of the right ventricle.
The final component is an overriding aorta, which means that the aorta lies
directly over the ventricular septal defect.
Tetralogy of Fallot occurs in about two out of every 10,000 live births.
Tetralogy of Fallot occurs equally in boys and in girls.
For more information, check out this site:
Transposition of the Great Arteries (or Vessels)
In this congenital heart defect, the aorta (the main artery that carries
blood to the body) originates from the right ventricle and the pulmonary
artery (the artery that carries low-oxygen blood to the lungs) from the left
ventricle. Because of this reversal, the aorta carries low-oxygen blood from
the right ventricle to the body. The pulmonary artery carries oxygen-rich
blood back to the lungs. In order for the infant born with transposition of
the great arteries to survive, they must have some communication between the
right and the left sides of the heart to allow-oxygen-rich blood to reach the
body. This mixing of blood is possible through an ASD, VSD or PDA. Even
though there is mixing of oxygenated and de-oxygenated blood, it is often not
adequate to sustain life for an extended period of time. Babies with
transposition are extremely blue at birth. The most common surgical procedure
to correct this defect is called an arterial switch operation. That is, the
major arteries are "switched". The aorta is connected to the left ventricle
and the pulmonary artery is connected to the right ventricle. The ASD, VSD
and/or PDA may also be needed to be corrected to restore normal blood flow.
TGA occurs in 5 to 7 percent of all congenital heart defects. Sixty to 70
percent of the infants born with the defect are boys.
Total anomalous pulmonary venous drainage
Pulmonary veins normally bring oxygenated blood back from the lungs to the
left atrium. In TAPVR all the pulmonary veins drain into the right atrium.
In order for the infant to survive, they must have some communication between
the right and left sides of the heart to allow-oxygenated blood to reach the
body. This is always an ASD, although a VSD may be present as well. Because
this oxygenated blood is so dilute, the infant may appear blue or "cyanotic".
There are three main types of TAPVR, depending on where the pulmonary veins
drain. There are referred to as supracardiac, intracardiac, and infracardiac.
There may also be a mixed type, in which two or more types may coexist. Open
heart surgery is needed in early infancy. The surgery involves removal of the
pulmonary veins from the right atrium and attaching them left atrium. The ASD
is also closed, along with any abnormal connections that may be present.
TAPVR occurs in one out of every 15,000 live births. It occurs in boys just
as often as in girls.
In this defect, only one artery originates from the heart and forms both the
aorta and the pulmonary artery. The truncus arises above a VSD that is almost
always associated with this defect. The truncus receives low-oxygen blood
from the right ventricle and oxygen-rich blood from the left ventricle. This
mix of high and low-oxygen blood is sent out to the body and to the lungs.
Open heart surgery in infancy is needed to correct this defect. The surgery
involves closure of the VSD and removal of the pulmonary arteries from the
truncus. The pulmonary arteries are then connected to the right ventricle
with a prosthetic tube. This prosthetic tube usually needs to be replaced as
the infant grows.
Truncus arteriosus occurs in less than one out of every 10,000 live births.
It makes up 1 percent of all cases of congenital heart disease.
In tricuspid atresia, there's no tricuspid valve so no blood can flow from
the right atrium to the right ventricle. As a result, the right ventricle is
small and not fully developed. Survival depends on there being an opening in
the wall between the atria (atrial septal defect) and usually an opening in
the wall between the two ventricles (ventricular septal defect). As a result,
the venous (bluish) blood that returns to the right atrium flows through the
atrial septal defect and into the left atrium. There it mixes with oxygen-rich
(red) blood from the lungs. Most of this poorly oxygenated mixture goes from
the left ventricle into the aorta and on to the body. The rest flows through
the ventricular septal defect into the small right ventricle, through the
pulmonary artery and back to the lungs. Often in these children it's necessary
to do a surgical shunting procedure to increase blood flow to the lungs. Some
children with tricuspid atresia have too much blood flowing to the lungs.
They may need a procedure (pulmonary artery banding) to decrease blood flow to
the lungs. Other children with tricuspid atresia may have a Fontan procedure.
In this, a connection is created between the right atrium and pulmonary artery.
The atrial defect is also closed. This eliminates the cyanosis but, without
a right ventricle that works normally, the heart can't work totally as it
Tricuspid atresia occurs in two out of every 10,000 live births. It makes up
1 to 2 percent of all cases of congenital heart disease. TA occurs equally in
boys and girls.
Ventricular Septal Defect
A ventricular septal defect, or VSD, is the most common kind of congenital
heart defect. Normally, blood entering the right side of the heart stays on
the right side (this is low-oxygen blood), and blood on the left side of the
heart stays on the left side (this is oxygen-rich blood) which is then pumped
to the rest of the body. When a defect or "hole" is present between the
ventricles (or lower chambers), blood from the left side of the heart is
forced through the defect to the right side every time the heart beats. It
then goes back to the lungs even though it is already rich in oxygen. Because
of this, blood that is not yet oxygen-rich can't get to the lungs. The most
common signs and symptoms are trouble eating and gaining weight,
breathlessness and easy fatigability. A baby with a large VSD tires quickly
after not eating very much, falls asleep, wakes us in a short while quite
hungry, tries to eat again, tires easily, and the cycle is repeated. Because
the heart has to pump extra blood, it may enlarge. Also, because there's more
blood going to the lungs, high pressure may occur in the blood vessels there.
This may cause permanent damage to the walls of the blood vessels over time.
Many, if not most, of all VSDs will close on their own. Those that close on
their own are usually small and do so in the first year of life. Large VSDs,
especially those that don't close in the first year of life, will usually need
to be closed surgically. VSD closure is one of the most commonly performed
congenital heart operations. The child would be expected to have virtually
normal growth, development, and life expectancy following repair.
Williams syndrome is a very complex birth defect that can have some or all
of the following defects.
The majority of individuals with Williams syndrome have some type of heart or
blood vessel problem. Typically, there is narrowing in the aorta (producing
supravalvar aortic stenosis or SVAS), or narrowing in the pulmonary arteries
(Pulmonary Stenosis). There is a broad range in the degree of narrowing,
ranging from trivial to severe (requiring surgical correction of the defect).
Since there is an increased risk for development of blood vessel narrowing or
high blood pressure over time, periodic monitoring of cardiac status is
The Williams Syndrome Foundation
for more information.
Characteristic facial appearance
Heart and blood vessel problems
Hypercalcemia (elevated blood calcium levels)
Low birth-weight / low weight gain
Irritability (colic during infancy)
Hyperacusis (sensitive hearing)
Overly friendly (excessively social) personality
Here is a list of links to sites with information on other syndromes that may
include heart problems:
Chromosomal related defects