Atrial septal defect

Last updated
Atrial septal defect
Asd-web.jpg
Illustration of an atrial septal defect.
Specialty Cardiac surgery
Symptoms asymptomatic

Atrial septal defect (ASD) is a congenital heart defect in which blood flows between the atria (upper chambers) of the heart. Some flow is a normal condition both pre-birth and immediately post-birth via the foramen ovale; however, when this does not naturally close after birth it is referred to as a patent (open) foramen ovale (PFO). It is common in patients with a congenital atrial septal aneurysm (ASA).

Contents

After PFO closure the atria normally are separated by a dividing wall, the interatrial septum. If this septum is defective or absent, then oxygen-rich blood can flow directly from the left side of the heart to mix with the oxygen-poor blood in the right side of the heart; or the opposite, depending on whether the left or right atrium has the higher blood pressure. [1] In the absence of other heart defects, the left atrium has the higher pressure. This can lead to lower-than-normal oxygen levels in the arterial blood that supplies the brain, organs, and tissues. However, an ASD may not produce noticeable signs or symptoms, especially if the defect is small. Also, in terms of health risks, people who have had a cryptogenic stroke are more likely to have a PFO than the general population. [2]

A cardiac shunt is the presence of a net flow of blood through a defect, either from left to right or right to left. The amount of shunting present, if any, determines the hemodynamic significance of the ASD. A right-to-left-shunt results in venous blood entering the left side of the heart and into the arterial circulation without passing through the pulmonary circulation to be oxygenated. This may result in the clinical finding of cyanosis, the presence of bluish-colored skin, especially of the lips and under the nails.

During development of the baby, the interatrial septum develops to separate the left and right atria. However, a hole in the septum called the foramen ovale allows blood from the right atrium to enter the left atrium during fetal development. This opening allows blood to bypass the nonfunctional fetal lungs while the fetus obtains its oxygen from the placenta. A layer of tissue called the septum primum acts as a valve over the foramen ovale during fetal development. After birth, the pressure in the right side of the heart drops as the lungs open and begin working, causing the foramen ovale to close entirely. In about 25% of adults, [3] the foramen ovale does not entirely seal. [4] In these cases, any elevation of the pressure in the pulmonary circulatory system (due to pulmonary hypertension, temporarily while coughing, etc.) can cause the foramen ovale to remain open.

Types

Schematic drawing showing the location of different types of ASD, the view is into an opened right atrium. HV: right ventricle; VCS: superior vena cava; VCI: inferior vena cava 1: upper sinus venosus defect; 2: lower sinus venosus defect; 3: secundum defect; 4: defect involving coronary sinus; 5; primum defect. Schematic drawing of various types of atrial septal defect.png
Schematic drawing showing the location of different types of ASD, the view is into an opened right atrium.
HV: right ventricle; VCS: superior vena cava; VCI: inferior vena cava
1: upper sinus venosus defect; 2: lower sinus venosus defect; 3: secundum defect; 4: defect involving coronary sinus; 5; primum defect.

The six types of atrial septal defects are differentiated from each other by whether they involve other structures of the heart and how they are formed during the developmental process during early fetal development.[ citation needed ]

Ostium secundum

The ostium secundum atrial septal defect is the most common type of atrial septal defect and comprises 6–10% of all congenital heart diseases.[ citation needed ] It involves a patent ostium secundum (that is, a patent foramen secundum). The secundum atrial septal defect usually arises from an enlarged foramen ovale, inadequate growth of the septum secundum, or excessive absorption of the septum primum. About 10 to 20% of individuals with ostium secundum ASDs also have mitral valve prolapse. [5]

An ostium secundum ASD accompanied by an acquired mitral valve stenosis is called Lutembacher's syndrome. [6]

Natural history

Most individuals with an uncorrected secundum ASD do not have significant symptoms through early adulthood. More than 70% develop symptoms by about 40 years of age. Symptoms are typically decreased exercise tolerance, easy fatigability, palpitations, and syncope.[ citation needed ]

Complications of an uncorrected secundum ASD include pulmonary hypertension, right-sided congestive heart failure.[ citation needed ]

While pulmonary hypertension is unusual before 20 years of age, it is seen in 50% of individuals above the age of 40. Progression to Eisenmenger's syndrome occurs in 5 to 10% of individuals late in the disease process. [6]

Patent foramen ovale

Patent foramen ovale Patent-foramen-ovale-en.png
Patent foramen ovale

A patent foramen ovale (PFO) is a remnant opening of the fetal foramen ovale, which often closes after a person's birth. This remnant opening is caused by the incomplete fusion of the septum primum and the septum secundum; in healthy hearts, this fusion form the fossa ovalis, a portion of the interatrial septum which corresponds to the location of the foramen ovale in the fetus. [7] In medical use, the term "patent" means open or unobstructed. [8] In about 25% of people, the foramen ovale does not close, leaving them with a PFO or at least with what some physicians classify as a "pro-PFO", which is a PFO that is normally closed, but can open under increased right atrial pressure. On echocardiography, shunting of blood may not be noted except when the patient coughs.[ citation needed ]

PFO is linked to stroke, sleep apnea, migraine with aura, cluster headache, decompression sickness, Raynaud's phenomenon, hyperventilation syndrome, transient global amnesia (TGA), and leftsided carcinoid heart disease (mitral valve). No cause is established for a foramen ovale to remain open instead of closing, but heredity and genetics may play a role. [9] [10] In rats research showed a link to the amount of Cryptosporidium infestation and the number of newborn rats that failed to close their foramen ovale. PFO is not treated in the absence of other symptoms.[ citation needed ]

The mechanism by which a PFO may play a role in stroke is called paradoxical embolism. In the case of PFO, a blood clot from the venous circulatory system is able to pass from the right atrium directly into the left atrium via the PFO, rather than being filtered by the lungs, and thereupon into systemic circulation toward the brain. [11] [12] Also multiple substances -including the prothrombotic agent serotonin- are shunted bypassing the lungs. PFO is common in patients with an atrial septal aneurysm (ASA), a much rarer condition, which is also linked to cryptogenic (i.e., of unknown cause) stroke. [13]

PFO is more common in people with cryptogenic stroke than in those with a stroke of known cause. [14] While PFO is present in 25% in the general population, the probability of someone having a PFO increases to about 40 to 50% in those who have had a cryptogenic stroke, and more so in those who have a stroke before the age of 55. [11] Treatment with anticoagulant and antiplatelet medications in this group appear similar. [15]

Ostium primum

A defect in the ostium primum is occasionally classified as an atrial septal defect, [16] but it is more commonly classified as an atrioventricular septal defect. [17] [18] Ostium primum defects are less common than ostium secundum defects. [19] This type of defect is usually associated with Down syndrome. [20]

Sinus venosus

A sinus venosus ASD is a type of atrial septum defect in which the defect involves the venous inflow of either the superior vena cava or the inferior vena cava.[ citation needed ]

A sinus venosus ASD that involves the superior vena cava makes up 2 to 3% of all interatrial communication. It is located at the junction of the superior vena cava and the right atrium. It is frequently associated with anomalous drainage of the right-sided pulmonary veins into the right atrium (instead of the normal drainage of the pulmonary veins into the left atrium). [21]

Ultrasound picture of the heart, seen in a subcostal view: The apex is towards the right, the atria are to the left. ASD secundum seen as a discontinuation of the white band of the atrial septum. The enlarged right atrium is below. The enlarged pulmonary veins are seen entering the left atrium above. Echokardiogram von Atriumseptumdefekt (Ostium secundum).jpg
Ultrasound picture of the heart, seen in a subcostal view: The apex is towards the right, the atria are to the left. ASD secundum seen as a discontinuation of the white band of the atrial septum. The enlarged right atrium is below. The enlarged pulmonary veins are seen entering the left atrium above.

Common or single atrium

Common (or single) atrium is a failure of development of the embryologic components that contribute to the atrial septal complex. It is frequently associated with heterotaxy syndrome. [22]

Mixed

The interatrial septum can be divided into five septal zones. If the defect involves two or more of the septal zones, then the defect is termed a mixed atrial septal defect. [23]

Presentation

Complications

Due to the communication between the atria that occurs in ASDs, disease entities or complications from the condition are possible. Patients with an uncorrected atrial septal defect may be at increased risk for developing a cardiac arrhythmia, as well as more frequent respiratory infections. [19]

Decompression sickness

ASDs, and particularly PFOs, are a predisposing venous blood carrying inert gases, such as helium or nitrogen does not pass through the lungs. [24] [25] The only way to release the excess inert gases from the body is to pass the blood carrying the inert gases through the lungs to be exhaled. If some of the inert gas-laden blood passes through the PFO, it avoids the lungs and the inert gas is more likely to form large bubbles in the arterial blood stream causing decompression sickness.[ citation needed ]

Eisenmenger's syndrome

If a net flow of blood exists from the left atrium to the right atrium, called a left-to-right shunt, then an increase in the blood flow through the lungs happens. Initially, this increased blood flow is asymptomatic, but if it persists, the pulmonary blood vessels may stiffen, causing pulmonary hypertension, which increases the pressures in the right side of the heart, leading to the reversal of the shunt into a right-to-left shunt. Reversal of the shunt occurs, and the blood flowing in the opposite direction through the ASD is called Eisenmenger's syndrome, a rare and late complication of an ASD.[ citation needed ]

Paradoxical embolus

Venous thrombus (clots in the veins) are quite common. Embolizations (dislodgement of thrombi) normally go to the lung and cause pulmonary emboli. In an individual with ASD, these emboli can potentially enter the arterial system, which can cause any phenomenon attributed to acute loss of blood to a portion of the body, including cerebrovascular accident (stroke), infarction of the spleen or intestines, or even a distal extremity (i.e., finger or toe).[ citation needed ]

This is known as a paradoxical embolus because the clot material paradoxically enters the arterial system instead of going to the lungs.[ citation needed ]

Migraine

Some recent research has suggested that a proportion of cases of migraine may be caused by PFO. While the exact mechanism remains unclear, closure of a PFO can reduce symptoms in certain cases. [26] [27] This remains controversial; 20% of the general population has a PFO, which for the most part, is asymptomatic. About 20% of the female population has migraines, and the placebo effect in migraine typically averages around 40%. The high frequency of these facts make finding statistically significant relationships between PFO and migraine difficult (i.e., the relationship may just be chance or coincidence). In a large randomized controlled trial, the higher prevalence of PFO in migraine patients was confirmed, but migraine headache cessation was not more prevalent in the group of migraine patients who underwent closure of their PFOs. [28]

Causes

Mechanisms

In unaffected individuals, the chambers of the left side of the heart are under higher pressure than the chambers of the right side because the left ventricle has to produce enough pressure to pump blood throughout the entire body, while the right ventricle needs only to produce enough pressure to pump blood to the lungs.[ citation needed ]

In the case of a large ASD (> 9 mm), which may result in a clinically remarkable left-to-right shunt, blood shunts from the left atrium to the right atrium. This extra blood from the left atrium may cause a volume overload of both the right atrium and the right ventricle. If untreated, this condition can result in enlargement of the right side of the heart and ultimately heart failure. [23]

Any process that increases the pressure in the left ventricle can cause worsening of the left-to-right shunt. This includes hypertension, which increases the pressure that the left ventricle has to generate to open the aortic valve during ventricular systole, and coronary artery disease which increases the stiffness of the left ventricle, thereby increasing the filling pressure of the left ventricle during ventricular diastole. The left-to-right shunt increases the filling pressure of the right heart (preload) and forces the right ventricle to pump out more blood than the left ventricle. This constant overloading of the right side of the heart causes an overload of the entire pulmonary vasculature. Eventually, pulmonary hypertension may develop.[ citation needed ]

The pulmonary hypertension will cause the right ventricle to face increased afterload. The right ventricle is forced to generate higher pressures to try to overcome the pulmonary hypertension. This may lead to right ventricular failure (dilatation and decreased systolic function of the right ventricle).[ citation needed ]

If the ASD is left uncorrected, the pulmonary hypertension progresses and the pressure in the right side of the heart becomes greater than the left side of the heart. This reversal of the pressure gradient across the ASD causes the shunt to reverse – a right-to-left shunt. This phenomenon is known as Eisenmenger's syndrome. Once right-to-left shunting occurs, a portion of the oxygen-poor blood gets shunted to the left side of the heart and ejected to the peripheral vascular system. This causes signs of cyanosis.[ citation needed ]


Diagnosis

Abnormal chest X-ray as seen in a patient of atrial septal defect ASD Chest X-Ray.jpg
Abnormal chest X-ray as seen in a patient of atrial septal defect

Most individuals with a significant ASD are diagnosed in utero or in early childhood with the use of ultrasonography or auscultation of the heart sounds during physical examination. Some individuals with an ASD have surgical correction of their ASD during childhood. The development of signs and symptoms due to an ASD are related to the size of the intracardiac shunt. Individuals with a larger shunt tend to present with symptoms at a younger age.[ citation needed ]

Adults with an uncorrected ASD present with symptoms of dyspnea on exertion (shortness of breath with minimal exercise), congestive heart failure, or cerebrovascular accident (stroke). They may be noted on routine testing to have an abnormal chest X-ray or an abnormal ECG and may have atrial fibrillation. If the ASD causes a left-to-right shunt, the pulmonary vasculature in both lungs may appear dilated on chest X-ray, due to the increase in pulmonary blood flow. [34]

Physical examination

The physical findings in an adult with an ASD include those related directly to the intracardiac shunt and those that are secondary to the right heart failure that may be present in these individuals.[ citation needed ]

In unaffected individuals, respiratory variations occur in the splitting of the second heart sound (S2). During respiratory inspiration, the negative intrathoracic pressure causes increased blood return into the right side of the heart. The increased blood volume in the right ventricle causes the pulmonic valve to stay open longer during ventricular systole. This causes a normal delay in the P2 component of S2. During expiration, the positive intrathoracic pressure causes decreased blood return to the right side of the heart. The reduced volume in the right ventricle allows the pulmonic valve to close earlier at the end of ventricular systole, causing P2 to occur earlier.[ citation needed ]

In individuals with an ASD, a fixed splitting of S2 occurs because the extra blood return during inspiration gets equalized between the left and right atria due to the communication that exists between the atria in individuals with ASD.[ citation needed ]

The right ventricle can be thought of as continuously overloaded because of the left-to-right shunt, producing a widely split S2. Because the atria are linked via the atrial septal defect, inspiration produces no net pressure change between them, and has no effect on the splitting of S2. Thus, S2 is split to the same degree during inspiration as expiration, and is said to be "fixed".[ citation needed ]

Echocardiography

In transthoracic echocardiography, an atrial septal defect may be seen on color flow imaging as a jet of blood from the left atrium to the right atrium.[ citation needed ]

If agitated saline is injected into a peripheral vein during echocardiography, small air bubbles can be seen on echocardiographic imaging. Bubbles traveling across an ASD may be seen either at rest or during a cough. (Bubbles only flow from right atrium to left atrium if the right atrial pressure is greater than left atrial). Because better visualization of the atria is achieved with transesophageal echocardiography, this test may be performed in individuals with a suspected ASD which is not visualized on transthoracic imaging. Newer techniques to visualize these defects involve intracardiac imaging with special catheters typically placed in the venous system and advanced to the level of the heart. This type of imaging is becoming more common and involves only mild sedation for the patient typically.[ citation needed ]

If the individual has adequate echocardiographic windows, use of the echocardiogram to measure the cardiac output of the left ventricle and the right ventricle independently is possible. In this way, the shunt fraction can be estimated using echocardiography.[ citation needed ]

Transcranial doppler bubble study

A less invasive method for detecting a PFO or other ASDs than transesophagal ultrasound is transcranial Doppler with bubble contrast. [35] This method reveals the cerebral impact of the ASD or PFO.[ citation needed ]

Electrocardiogram

The ECG findings in atrial septal defect vary with the type of defect the individual has. Individuals with atrial septal defects may have a prolonged PR interval (a first-degree heart block). The prolongation of the PR interval is probably due to the enlargement of the atria common in ASDs and the increased distance due to the defect itself. Both of these can cause an increased distance of internodal conduction from the SA node to the AV node. [36]

In addition to the PR prolongation, individuals with a primum ASD have a left axis deviation of the QRS complex, while those with a secundum ASD have a right axis deviation of the QRS complex. Individuals with a sinus venosus ASD exhibit a left axis deviation of the P wave (not the QRS complex).[ citation needed ]

A common finding in the ECG is the presence of incomplete right bundle branch block, which is so characteristic that if it is absent, the diagnosis of ASD should be reconsidered.[ citation needed ]

Treatment

Patent foramen ovale

Most patients with a PFO are asymptomatic and do not require any specific treatment. [38] However, those who develop a stroke require further workup to identify the etiology. In those where a comprehensive evaluation is performed and an obvious etiology is not identified, they are defined as having a cryptogenic stroke. The mechanism for stroke is such individuals is likely embolic due to paradoxical emboli, a left atrial appendage clot, a clot on the inter-atrial septum, or within the PFO tunnel. [39]

PFO closure

The Amplatzer Septal Occluder is a device specifically designed to close an ASD Amplatzer Septal Occluder 2.jpg
The Amplatzer Septal Occluder is a device specifically designed to close an ASD

Until recently, patients with PFO and cryptogenic stroke were treated with antiplatelet therapy only. Previous studies did not identify a clear benefit of PFO closure over antiplatelet therapy in reducing recurrent ischemic stroke. However, based on new evidence [40] [41] [42] and systematic review in the field, [39] percutaneous PFO closure in addition to antiplatelet therapy is suggested for all who meet all the following criteria: [43]

A variety of PFO closure devices may be implanted via catheter-based procedures. [45] [46]

Amplatzer PFO Occluder in heart PFO closure amplazer implant.jpg
Amplatzer PFO Occluder in heart

Medical therapy

Based on the most up to date evidence, PFO closure is more effective at reducing recurrent ischemic stroke when compared to medical therapy. In most of these studies, antiplatelet and anticoagulation were combined in the medical therapy arm. Although there is limited data on the effectiveness of anticoagulation in reducing stroke in this population, it is hypothesized that based on the embolic mechanism, that anticoagulation should be superior to antiplatelet therapy at reducing risk of recurrent stroke. A recent review of the literature supports this hypothesis recommending anticoagulation over the use of antiplatelet therapy in patients with PFO and cryptogenic stroke. [39] However, more evidence is required comparing of PFO closure with anticoagulation or anticoagulation with antiplatelet therapy.[ citation needed ]

Atrial septal defect

Once someone is found to have an atrial septal defect, a determination of whether it should be corrected is typically made. If the atrial septal defect is causing the right ventricle to enlarge a secundum atrial septal defect should generally be closed. [47] If the ASD is not causing problems the defect may simply be checked every two or three years. [47] Methods of closure of an ASD include surgical closure and percutaneous closure.[ citation needed ]

Evaluation prior to correction

Prior to correction of an ASD, an evaluation is made of the severity of the individual's pulmonary hypertension (if present at all) and whether it is reversible (closure of an ASD may be recommended for prevention purposes, to avoid such a complication in the first place. Pulmonary hypertension is not always present in adults who are diagnosed with an ASD in adulthood).[ citation needed ]

If pulmonary hypertension is present, the evaluation may include a right heart catheterization. This involves placing a catheter in the venous system of the heart and measuring pressures and oxygen saturations in the superior vena cava, inferior vena cava, right atrium, right ventricle, and pulmonary artery, and in the wedge position. Individuals with a pulmonary vascular resistance (PVR) less than 7 wood units show regression of symptoms (including NYHA functional class). However, individuals with a PVR greater than 15 wood units have increased mortality associated with closure of the ASD.[ citation needed ]

If the pulmonary arterial pressure is more than two-thirds of the systemic systolic pressure, a net left-to-right shunt should occur at least 1.5:1 or evidence of reversibility of the shunt when given pulmonary artery vasodilators prior to surgery. (If Eisenmenger's physiology has set in, the right-to-left shunt must be shown to be reversible with pulmonary artery vasodilators prior to surgery.)[ citation needed ]

Surgical mortality due to closure of an ASD is lowest when the procedure is performed prior to the development of significant pulmonary hypertension. The lowest mortality rates are achieved in individuals with a pulmonary artery systolic pressure less than 40 mmHg. If Eisenmenger's syndrome has occurred, a significant risk of mortality exists regardless of the method of closure of the ASD. In individuals who have developed Eisenmenger's syndrome, the pressure in the right ventricle has raised high enough to reverse the shunt in the atria. If the ASD is then closed, the afterload that the right ventricle has to act against has suddenly increased. This may cause immediate right ventricular failure, since it may not be able to pump the blood against the pulmonary hypertension.[ citation needed ]

Surgical closure

Illustration depicting surgical patch closure of ASD Blausen 0070 AtrialSeptalDefect PatchClosure.png
Illustration depicting surgical patch closure of ASD

Surgical closure of an ASD involves opening up at least one atrium and closing the defect with a patch under direct visualization.[ citation needed ]

Catheter procedure

Illustration depicting surgical device closure of ASD Blausen 0070 AtrialSeptalDefect DeviceClosure.png
Illustration depicting surgical device closure of ASD

Percutaneous device closure involves the passage of a catheter into the heart through the femoral vein guided by fluoroscopy and echocardiography. [13] An example of a percutaneous device is a device which has discs that can expand to a variety of diameters at the end of the catheter. The catheter is placed in the right femoral vein and guided into the right atrium. The catheter is guided through the atrial septal wall and one disc (left atrial) is opened and pulled into place. Once this occurs, the other disc (right atrial) is opened in place and the device is inserted into the septal wall. This type of PFO closure is more effective than drug or other medical therapies for decreasing the risk of future thromboembolism. [13] [48] [49] The most common adverse effect of PFO device closure is new-onset atrial fibrillation. [50] Other complications, all rare, include device migration, erosion and embolization and device thrombosis or formation of an inflammatory mass with risk for recurrent ischemic stroke. [51] [52]

Percutaneous closure of an ASD is currently only indicated for the closure of secundum ASDs with a sufficient rim of tissue around the septal defect so that the closure device does not impinge upon the superior vena cava, inferior vena cava, or the tricuspid or mitral valves. The Amplatzer Septal Occluder (ASO) is commonly used to close ASDs. The ASO consists of two self-expandable round discs connected to each other with a 4-mm waist, made up of 0.004– to 0.005-inch Nitinol wire mesh filled with Dacron fabric. Implantation of the device is relatively easy. The prevalence of residual defect is low. The disadvantages are a thick profile of the device and concern related to a large amount of nitinol (a nickel-titanium compound) in the device and consequent potential for nickel toxicity.[ citation needed ]

Percutaneous closure is the method of choice in most centres. [53] Studies evaluating percutaneous ASD closure among pediatric and adult population show that this is relatively safer procedure and has better outcomes with increasing hospital volume. [54] [55]

Epidemiology

As a group, atrial septal defects are detected in one child per 1500 live births. PFOs are quite common (appearing in 10–20% of adults), but when asymptomatic go undiagnosed. ASDs make up 30 to 40% of all congenital heart diseases that are seen in adults. [56]

The ostium secundum atrial septal defect accounts for 7% of all congenital heart lesions. This lesion shows a male:female ratio of 1:2. [57]

Related Research Articles

dextro-Transposition of the great arteries Medical condition

dextro-Transposition of the great arteries is a potentially life-threatening birth defect in the large arteries of the heart. The primary arteries are transposed.

<span class="mw-page-title-main">Ostium primum atrial septal defect</span> Medical condition

The ostium primum atrial septal defect is a defect in the atrial septum at the level of the tricuspid and mitral valves. This is sometimes known as an endocardial cushion defect because it often involves the endocardial cushion, which is the portion of the heart where the atrial septum meets the ventricular septum and the mitral valve meets the tricuspid valve.

<span class="mw-page-title-main">Congenital heart defect</span> Defect in the structure of the heart that is present at birth

A congenital heart defect (CHD), also known as a congenital heart anomaly, congenital cardiovascular malformation, and congenital heart disease, is a defect in the structure of the heart or great vessels that is present at birth. A congenital heart defect is classed as a cardiovascular disease. Signs and symptoms depend on the specific type of defect. Symptoms can vary from none to life-threatening. When present, symptoms are variable and may include rapid breathing, bluish skin (cyanosis), poor weight gain, and feeling tired. CHD does not cause chest pain. Most congenital heart defects are not associated with other diseases. A complication of CHD is heart failure.

<span class="mw-page-title-main">Ventricular septal defect</span> Medical condition

A ventricular septal defect (VSD) is a defect in the ventricular septum, the wall dividing the left and right ventricles of the heart. The extent of the opening may vary from pin size to complete absence of the ventricular septum, creating one common ventricle. The ventricular septum consists of an inferior muscular and superior membranous portion and is extensively innervated with conducting cardiomyocytes.

<span class="mw-page-title-main">Atrium (heart)</span> Part of the human heart

The atrium is one of the two upper chambers in the heart that receives blood from the circulatory system. The blood in the atria is pumped into the heart ventricles through the atrioventricular mitral and tricuspid heart valves.

<span class="mw-page-title-main">Tricuspid atresia</span> Medical condition

Tricuspid atresia is a form of congenital heart disease whereby there is a complete absence of the tricuspid valve. Therefore, there is an absence of right atrioventricular connection. This leads to a hypoplastic (undersized) or absent right ventricle. This defect is contracted during prenatal development, when the heart does not finish developing. It causes the systemic circulation to be filled with relatively deoxygenated blood. The causes of tricuspid atresia are unknown.

<span class="mw-page-title-main">Fossa ovalis (heart)</span> Feature of the right atrium in the human heart

The fossa ovalis is a depression in the right atrium of the heart, at the level of the interatrial septum, the wall between right and left atrium. The fossa ovalis is the remnant of a thin fibrous sheet that covered the foramen ovale during fetal development.

<span class="mw-page-title-main">Foramen ovale (heart)</span> Passageway between the atria of the human heart

In the fetal heart, the foramen ovale, also foramen Botalli or the ostium secundum of Born, allows blood to enter the left atrium from the right atrium. It is one of two fetal cardiac shunts, the other being the ductus arteriosus. Another similar adaptation in the fetus is the ductus venosus. In most individuals, the foramen ovale closes at birth. It later forms the fossa ovalis.

<span class="mw-page-title-main">Interatrial septum</span> Wall of tissue separating atria of human heart

The interatrial septum is the wall of tissue that separates the right and left atria of the heart.

Levo-Transposition of the great arteries is an acyanotic congenital heart defect in which the primary arteries are transposed, with the aorta anterior and to the left of the pulmonary artery; the morphological left and right ventricles with their corresponding atrioventricular valves are also transposed.

<span class="mw-page-title-main">Balloon septostomy</span> Medical procedure

Balloon septostomy is the widening of a foramen ovale, patent foramen ovale (PFO), or atrial septal defect (ASD) via cardiac catheterization using a balloon catheter. This procedure allows a greater amount of oxygenated blood to enter the systemic circulation in some cases of cyanotic congenital heart defect (CHD).

An embolus, is described as a free-floating mass, located inside blood vessels that can travel from one site in the blood stream to another. An embolus can be made up of solid, liquid, or gas. Once these masses get "stuck" in a different blood vessel, it is then known as an "embolism." An embolism can cause ischemia—damage to an organ from lack of oxygen. A paradoxical embolism is a specific type of embolism in which the embolus travels from the right side of the heart to the left side of the heart and lodges itself in a blood vessel known as an artery. Thus, it is termed "paradoxical" because the embolus lands in an artery, rather than a vein.

<span class="mw-page-title-main">Septum primum</span>

During heart development of a human embryo, the single primitive atrium becomes divided into right and left by a septum, the septum primum. The septum primum grows downward into the single atrium.

<span class="mw-page-title-main">Septum secundum</span>

The septum secundum is a muscular flap that is important in heart development. It is semilunar in shape, and grows downward from the upper wall of the atrium immediately to the right of the septum primum and ostium secundum. It is important in the closure of the foramen ovale after birth.

<span class="mw-page-title-main">Foramen secundum</span>

The foramen secundum or ostium secundum is a foramen in the septum primum, a precursor to the interatrial septum of the human heart.

<span class="mw-page-title-main">Primary interatrial foramen</span>

In the developing heart, the atria are initially open to each other, with the opening known as the primary interatrial foramen or ostium primum. The foramen lies beneath the edge of septum primum and the endocardial cushions. It progressively decreases in size as the septum grows downwards, and disappears with the formation of the atrial septum.

A cardiac shunt is a pattern of blood flow in the heart that deviates from the normal circuit of the circulatory system. It may be described as right-left, left-right or bidirectional, or as systemic-to-pulmonary or pulmonary-to-systemic. The direction may be controlled by left and/or right heart pressure, a biological or artificial heart valve or both. The presence of a shunt may also affect left and/or right heart pressure either beneficially or detrimentally.

<span class="mw-page-title-main">Lutembacher's syndrome</span> Medical condition

Lutembacher's syndrome is a very rare form of congenital heart disease that affects one of the chambers of the heart as well as a valve. It is commonly known as both congenital atrial septal defect (ASD) and acquired mitral stenosis (MS). Congenital atrial septal defect refers to a hole being in the septum or wall that separates the two atria; this condition is usually seen in fetuses and infants. Mitral stenosis refers to mitral valve leaflets sticking to each other making the opening for blood to pass from the atrium to the ventricles very small. With the valve being so small, blood has difficulty passing from the left atrium into the left ventricle. Septal defects that may occur with Lutembacher's syndrome include: Ostium primum atrial septal defect or ostium secundum which is more prevalent.

<span class="mw-page-title-main">Atrial septostomy</span> Surgical procedure on the heart

Atrial septostomy is a surgical procedure in which a small hole is created between the upper two chambers of the heart, the atria. This procedure is primarily used to palliate dextro-Transposition of the great arteries or d-TGA, a life-threatening cyanotic congenital heart defect seen in infants. It is performed prior to an arterial switch operation. Atrial septostomy has also seen limited use as a surgical treatment for pulmonary hypertension. The first atrial septostomy was developed by Vivien Thomas in a canine model and performed in humans by Alfred Blalock. The Rashkind balloon procedure, a common atrial septostomy technique, was developed in 1966 by American cardiologist William Rashkind at the Children's Hospital of Philadelphia.

Raghib syndrome is rare a congenital heart defect where the left superior vena cava (LSVC) is draining into the left atrium in addition to an absent coronary sinus and an atrial septal defect. This can be considered a dangerous heart condition because it puts the individual at a high risk of stroke. Other defects that are often associated with Raghib syndrome can include ventricular septal defects, enlargement of the tricuspid annulus, and pulmonary stenosis. While this is considered an extremely rare developmental complex, cases regarding a persistent left superior vena cava (PLSVC) are relatively common among congenital heart defects. It is also important to note that the PLSVC often drains into the right atrium, and only drains into the left atrium in approximately 10 to 20% of individuals with the defect.

References

  1. ↑ "Atrial Septal Defect Information". The Mount Sinai Hospital.
  2. ↑ "UpToDate".
  3. ↑ Kumar, Vinay (2007). Robbins Basic Pathology (8th ed.). Philadelphia: Saunders/Elsevier. p. 384. ISBN   978-1416029731.
  4. ↑ "Ostium Secundum Atrial Septal Defects". WebMD. Medscape. Retrieved 5 November 2012.
  5. ↑ Leachman R, Cokkinos D, Cooley D (1976). "Association of ostium secundum atrial septal defects with mitral valve prolapse". Am J Cardiol. 38 (2): 167–169. doi:10.1016/0002-9149(76)90144-2. PMID   952260.
  6. 1 2 3 Goldman 2011 , pp. 400–401
  7. ↑ Oduah, Mary-Tiffany A.; Sharma, Piyush; Brown, Kristen N. (2023), "Anatomy, Thorax, Heart Fossa Ovalis", StatPearls, Treasure Island (FL): StatPearls Publishing, PMID   30860703 , retrieved 2023-11-15
  8. ↑ "patent". Medical Dictionary. TheFreeDictionary.com. September 1, 2014. Retrieved 2015-03-26.
  9. ↑ "Patent Foramen Ovale Symptoms & Causes". Boston Children's Hospital. Archived from the original on 2016-07-23. Retrieved 2016-07-19.
  10. ↑ "Patent Foramen Ovale". Texas Heart Institute Heart Information Center.
  11. 1 2 "Patent Foramen Ovale (PFO)". www.heart.org.
  12. ↑ Furlan AJ, Reisman M, Massaro J, Mauri L, Adams H, Albers GW, Felberg R, Herrmann H, Kar S, Landzberg M, Raizner A, Wechsler L (2012). "Closure or medical therapy for cryptogenic stroke with patent foramen ovale". The New England Journal of Medicine. 366 (11): 991–999. doi: 10.1056/NEJMoa1009639 . PMID   22417252.
  13. 1 2 3 Freixa X, Arzamendi D, Tzikas A, Noble S, Basmadjian A, Garceau P, Ibrahim R (2014). "Cardiac procedures to prevent stroke: patent foramen ovale closure/left atrial appendage occlusion". The Canadian Journal of Cardiology. 30 (1): 87–95. doi:10.1016/j.cjca.2013.11.008. PMID   24365193.
  14. ↑ Homma, Shunichi; Sacco, Ralph L; Di Tullio, Marco R; Sciacca, Robert R; Mohr, JP (2002). "Effect of medical treatment in stroke patients with patent foramen ovale: patent foramen ovale in Cryptogenic Stroke Study". Circulation. 105 (22): 2625–2631. doi: 10.1161/01.CIR.0000017498.88393.44 . PMID   12045168.
  15. ↑ Sagris, D; Georgiopoulos, G; Perlepe, K; Pateras, K; Korompoki, E; Makaritsis, K; Vemmos, K; Milionis, H; Ntaios, G (November 2019). "Antithrombotic Treatment in Cryptogenic Stroke Patients With Patent Foramen Ovale: Systematic Review and Meta-Analysis". Stroke. 50 (11): 3135–3140. doi: 10.1161/STROKEAHA.119.026512 . PMID   31547797.
  16. ↑ "Atrial Septal Defect Types". Mayo Clinic . Archived from the original on 28 September 2007. Retrieved 2007-10-14.
  17. ↑ Fix, James D.; Dudek, Ronald W. (1998). Embryology . Baltimore: Williams & Wilkins. pp.  52. ISBN   978-0-683-30272-1.
  18. ↑ Q21.2
  19. 1 2 Skelley, Tao Le, Vikas Bhushan, Nathan William (2012). First aid for the USMLE step 2 CK (8th ed.). New York: McGraw–Hill Medical. p. 357. ISBN   978-0-07-176137-6.{{cite book}}: CS1 maint: multiple names: authors list (link)
  20. ↑ "Endocardial Cushion Defect Information". The Mount Sinai Hospital.
  21. ↑ Davia J, Cheitlin M, Bedynek J (1973). "Sinus venosus atrial septal defect: analysis of fifty cases". Am Heart J. 85 (2): 177–185. doi:10.1016/0002-8703(73)90458-4. PMID   4569755.
  22. ↑ Valdes-Cruz, L. M.; Cayre, R. O. (1998). Echocardiographic diagnosis of congenital heart disease. Philadelphia.{{cite book}}: CS1 maint: location missing publisher (link)
  23. 1 2 John, J; Abrol, S; Sadiq, A; Shani, J (Jul 26, 2011). "Mixed atrial septal defect coexisting ostium secundum and sinus venosus atrial septal defect". Journal of the American College of Cardiology. 58 (5): e9. doi: 10.1016/j.jacc.2010.11.077 . PMID   21777739 . Retrieved 17 June 2012.
  24. ↑ Lier H, Schroeder S, Hering R (2004). "Patent foramen ovale: an underrated risk for divers?". Dtsch Med Wochenschr. 129 (1–2): 27–30. doi:10.1055/s-2004-812652. PMID   14703578. S2CID   260108807.
  25. ↑ Saary M, Gray G (2001). "A review of the relationship between patent foramen ovale and type II decompression sickness". Aviat Space Environ Med. 72 (12): 1113–1120. PMID   11763113.
  26. ↑ Adams H (2004). "Patent foramen ovale: paradoxical embolism and paradoxical data". Mayo Clin Proc. 79 (1): 15–20. doi: 10.4065/79.1.15 . PMID   14708944.
  27. ↑ Azarbal B, Tobis J, Suh W, Chan V, Dao C, Gaster R (2005). "Association of interatrial shunts and migraine headaches: impact of transcatheter closure". J Am Coll Cardiol. 45 (4): 489–492. doi: 10.1016/j.jacc.2004.09.075 . PMID   15708691.
  28. ↑ Dowson, Andrew; Mullen, MJ; Peatfield, R; Muir, K; Khan, AA; Wells, C; Lipscombe, SL; Rees, T; De Giovanni, JV; Morrison, WL; Hildick-Smith, D; Elrington, G; Hillis, WS; Malik, IS; Rickards, A (18 March 2008). "Migraine Intervention With STARFlex Technology (MIST) trial: a prospective, multicenter, double-blind, sham-controlled trial to evaluate the effectiveness of patent foramen ovale closure with STARFlex septal repair implant to resolve refractory migraine headache". Circulation. 117 (11): 1397–1404. doi: 10.1161/CIRCULATIONAHA.107.727271 . PMID   18316488.
  29. 1 2 Vis, JC; Duffels, MG; Winter, MM; Weijerman, ME; Cobben, JM; Huisman, SA; Mulder, BJ (May 2009). "Down syndrome: a cardiovascular perspective". Journal of Intellectual Disability Research. 53 (5): 419–425. doi:10.1111/j.1365-2788.2009.01158.x. PMID   19228275.
  30. ↑ Cherry, C; DeBord, S; Moustapha-Nadler, N (June 2009). "Ebstein's anomaly: a complex congenital heart defect". AORN Journal. 89 (6): 1098–1110, quiz 1111–1114. doi:10.1016/j.aorn.2009.03.003. PMID   19606562.
  31. ↑ p. 119 Jaypee Brothers, First Edition 2014, ISBN   978-93-5152-140-2.
  32. ↑ Burd, L; Deal, E; Rios, R; Adickes, E; Wynne, J; Klug, MG (July–August 2007). "Congenital heart defects and fetal alcohol spectrum disorders". Congenital Heart Disease. 2 (4): 250–255. doi:10.1111/j.1747-0803.2007.00105.x. PMID   18377476.
  33. ↑ Bossert, T; Walther, T; Gummert, J; Hubald, R; Kostelka, M; Mohr, FW (October 2002). "Cardiac malformations associated with the Holt–Oram syndrome – report on a family and review of the literature". The Thoracic and Cardiovascular Surgeon. 50 (5): 312–314. doi:10.1055/s-2002-34573. PMID   12375192. S2CID   19665997.
  34. ↑ Goldman 2011 , p. 270
  35. ↑ Glen, S.; J. Douglas. (1995). "Transcranial doppler monitoring. (letter to editor)". South Pacific Underwater Medicine Society Journal. 25 (2). ISSN   0813-1988. OCLC   16986801. Archived from the original on 2012-04-26. Retrieved 2008-04-06.{{cite journal}}: CS1 maint: unfit URL (link)
  36. ↑ Clark E, Kugler J (1982). "Preoperative secundum atrial septal defect with coexisting sinus node and atrioventricular node dysfunction". Circulation. 65 (5): 976–980. doi: 10.1161/01.CIR.65.5.976 . PMID   7074763.
  37. 1 2 3 "UOTW #54 – Ultrasound of the Week". Ultrasound of the Week. 30 July 2015. Retrieved 27 May 2017.
  38. ↑ "UpToDate". www.uptodate.com. Retrieved 2018-08-04.
  39. 1 2 3 Mir, Hassan; Siemieniuk, Reed Alexander C.; Ge, Long Cruz; Foroutan, Farid; Fralick, Michael; Syed, Talha; Lopes, Luciane Cruz; Kuijpers, Ton; Mas, Jean-Louis (2018-07-01). "Patent foramen ovale closure, antiplatelet therapy or anticoagulation in patients with patent foramen ovale and cryptogenic stroke: a systematic review and network meta-analysis incorporating complementary external evidence". BMJ Open. 8 (7): e023761. doi:10.1136/bmjopen-2018-023761. ISSN   2044-6055. PMC   6067350 . PMID   30049703.
  40. ↑ Mas, Jean-Louis; Derumeaux, Geneviève; Guillon, Benoît; Massardier, Evelyne; Hosseini, Hassan; Mechtouff, Laura; Arquizan, Caroline; Béjot, Yannick; Vuillier, Fabrice (2017-09-14). "Patent Foramen Ovale Closure or Anticoagulation vs. Antiplatelets after Stroke". New England Journal of Medicine. 377 (11): 1011–1021. doi: 10.1056/nejmoa1705915 . ISSN   0028-4793. PMID   28902593.
  41. ↑ Søndergaard, Lars; Kasner, Scott E.; Rhodes, John F.; Andersen, Grethe; Iversen, Helle K.; Nielsen-Kudsk, Jens E.; Settergren, Magnus; Sjöstrand, Christina; Roine, Risto O. (2017-09-14). "Patent Foramen Ovale Closure or Antiplatelet Therapy for Cryptogenic Stroke". New England Journal of Medicine. 377 (11): 1033–1042. doi: 10.1056/nejmoa1707404 . ISSN   0028-4793. PMID   28902580.
  42. ↑ Saver, Jeffrey L.; Carroll, John D.; Thaler, David E.; Smalling, Richard W.; MacDonald, Lee A.; Marks, David S.; Tirschwell, David L. (2017-09-14). "Long-Term Outcomes of Patent Foramen Ovale Closure or Medical Therapy after Stroke". New England Journal of Medicine. 377 (11): 1022–1032. doi: 10.1056/nejmoa1610057 . ISSN   0028-4793. PMID   28902590. S2CID   3425515.
  43. ↑ Kuijpers, Ton; Spencer, Frederick A; Siemieniuk, Reed A C; Vandvik, Per O; Otto, Catherine M; Lytvyn, Lyubov; Mir, Hassan; Jin, Albert Y; Manja, Veena; Karthikeyan, Ganesan; Hoendermis, Elke; Martin, Janet; Carballo, Sebastian; O'Donnell, Martin; Vartdal, Trond; Baxter, Christine; Patrick-Lake, Bray; Scott, Joanie; Agoritsas, Thomas; Guyatt, Gordon (25 July 2018). "Patent foramen ovale closure, antiplatelet therapy or anticoagulation therapy alone for management of cryptogenic stroke? A clinical practice guideline". BMJ. 362: k2515. doi:10.1136/bmj.k2515. PMC   6058599 . PMID   30045912.
  44. ↑ "UpToDate". www.uptodate.com.
  45. ↑ "How is a Patent Foramen Ovale (PFO) Closed Using a Catheter-based Procedure?". Cleveland Clinic. Archived from the original on 29 July 2016. Retrieved 20 July 2016.
  46. ↑ Brauser, Deborah (16 October 2015). "RESPECT 10-Year Data Strengthens Case for PFO Closure After Cryptogenic Stroke". Medscape. Retrieved 20 July 2016.
  47. 1 2 Kuijpers, JM; Mulder, BJ; Bouma, BJ (April 2015). "Secundum atrial septal defect in adults: a practical review and recent developments". Netherlands Heart Journal. 23 (4): 205–211. doi:10.1007/s12471-015-0663-z. PMC   4368528 . PMID   25884091.
  48. ↑ Shah, Rahman; Nayyar, Mannu; Jovin, Ion S.; Rashid, Abdul; Bondy, Beatrix R.; Fan, Tai-Hwang M.; Flaherty, Michael P.; Rao, Sunil V. (9 January 2018). "Device Closure Versus Medical Therapy Alone for Patent Foramen Ovale in Patients With Cryptogenic Stroke". Annals of Internal Medicine. 168 (5): 335–342. doi:10.7326/M17-2679. PMID   29310136. S2CID   3679132.
  49. ↑ De Rosa, Salvatore; Sievert, Horst; Sabatino, Jolanda; Polimeni, Alberto; Sorrentino, Sabato; Indolfi, Ciro (9 January 2018). "Percutaneous Closure Versus Medical Treatment in Stroke Patients With Patent Foramen Ovale". Annals of Internal Medicine. 168 (5): 343–350. doi:10.7326/M17-3033. PMID   29310133. S2CID   3725081.
  50. ↑ Vaduganathan, Muthiah (May 2018). "Patent Foramen Ovale Closure for Secondary Prevention of Cryptogenic Stroke: Updated Meta-Analysis of Randomized Clinical Trials". The American Journal of Medicine. 131 (5): 575–577. doi:10.1016/j.amjmed.2017.11.027. ISSN   0002-9343. PMC   5910216 . PMID   29229471.
  51. ↑ Moore, John (May 2013). "Transcatheter Device Closure of Atrial Septal Defects". JACC: Cardiovascular Interventions. 6 (5): 433–442. doi: 10.1016/j.jcin.2013.02.005 . PMID   23702008.
  52. ↑ Ballet, Arne; Ballet, Brice; Deblier, Ivo (22 June 2019). "Inflammatory mass formation on a patent foramen ovale closure device seventeen years after implantation". Acta Cardiologica. 75 (6): 563–564. doi:10.1080/00015385.2019.1630587. PMID   31230531. S2CID   195326653.
  53. ↑ Bjørnstad P (2006). "Is interventional closure the current treatment of choice for selected patients with deficient atrial septation?". Cardiol Young. 16 (1): 3–10. doi:10.1017/S1047951105002027. PMID   16454871. S2CID   29440976.
  54. ↑ Bhatt, P; Patel, A; Kumar, V; Lekshminarayanan, A; Patel, V; Alapati, S (August 2018). "Impact of hospital volume on outcomes of percutaneous ASD/PFO closure in pediatric patients". World Journal of Pediatrics. 14 (4): 364–372. doi:10.1007/s12519-018-0120-3. PMID   29508364. S2CID   3754034.
  55. ↑ Singh, V; Badheka, AO; Patel, NJ; Chothani, A; Mehta, K; Arora, S; Patel, N; Deshmukh, A; Shah, N; Savani, GT; Rathod, A; Manvar, S (22 December 2014). "Influence of hospital volume on outcomes of percutaneous atrial septal defect and patent foramen ovale closure: A 10-years us perspective". Catheterization and Cardiovascular Interventions. 85 (6): 1073–1081. doi:10.1002/ccd.25794. PMID   25534392. S2CID   35885231.
  56. ↑ Kaplan S (1993). "Congenital heart disease in adolescents and adults. Natural and postoperative history across age groups". Cardiol Clin. 11 (4): 543–556. doi:10.1016/S0733-8651(18)30137-1. PMID   8252558.
  57. ↑ Feldt R, Avasthey P, Yoshimasu F, Kurland L, Titus J (1971). "Incidence of congenital heart disease in children born to residents of Olmsted County, Minnesota, 1950–1969". Mayo Clin Proc. 46 (12): 794–799. PMID   5128021.

PD-icon.svg This article incorporates public domain material from National Heart, Lung, and Blood Institute. United States Department of Health and Human Services.

Additional references

Further reading

This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.