Articles

Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and edited by countless contributing members over a period of time. A global group of dedicated editors oversee accuracy, consulting with expert advisers, and constantly reviewing additions.

463 results found
Article

Congenital coronary artery anomalies

Congenital coronary artery anomalies (CCAAs) are not common, found only in ~1% (range 0.1-2%) of patients 1,3.The most important finding to look for is the "malignant" course of anomalous coronary artery, i.e. does the artery run between big pulsating objects - right ventricular outflow tract / ...
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Congenital heart disease chest x-ray (an approach)

With the advent of echocardiography, and cardiac CT and MRI, the role of chest x-rays in evaluating congenital heart disease has been largely been relegated to one of historical and academic interest, although they continue to crop up in radiology exams. In most instances a definite diagnosis ca...
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Congenitally corrected transposition of the great arteries

Congenitally corrected transposition of the great arteries, also known as levo- or L-loop transposition (L-TGA), is a rare cardiovascular anomaly with inversion of the ventricles and great arteries. Epidemiology This anomaly comprises less than 1% of all congenital heart diseases 1,2,7.  Clin...
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Congenital pulmonary stenosis

Congenital pulmonary stenosis (CPS) refers to congenital narrowing of the right ventricular outflow tract, pulmonary valve or pulmonary artery. See pulmonary valve stenosis for a general discussion about this valvulopathy. Epidemiology The estimated incidence is 1 in 2000 births. Pathology ...
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Congenital pulmonary venolobar syndrome

Congenital pulmonary venolobar syndrome is a condition comprised of a rare group of cardiac and pulmonary congenital abnormalities occurring variably in combination. The abnormalities include: anomalous pulmonary venous drainage particularly scimitar syndrome with hypogenic right lung pulmona...
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Congestive cardiac failure

Congestive cardiac failure (CCF), also known as congestive heart failure (CHF), refers to the clinical syndrome caused by inherited or acquired abnormalities of heart structure and function, causing a constellation of symptoms and signs that lead to decreased quality and quantity of life. Epide...
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Conotruncal cardiac anomalies

Conotruncal heart defects are a group of congenital cardiovascular anomalies. They are a leading cause symptomatic cyanotic cardiac disease diagnosed in utero. Epidemiology They may account for up to a fifth of all congenital cardiac anomalies diagnosed prenatally 2. Clinical presentation Du...
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Constrictive pericarditis

Constrictive pericarditis (or perhaps better termed pericardial constriction) is a type of pericarditis which leads to diastolic dysfunction and potentially symptoms of right heart failure.  Epidemiology No single demographic is affected as there are numerous causes of constrictive pericarditi...
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Conus artery

The conus artery is a small early branch off the right coronary artery (RCA) circulation. Gross anatomy Supply The artery has a variable distribution, but usually supplies a region of the anterior interventricular septum and the conus of the main pulmonary artery (hence its name). Variant an...
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Coronary arterial dominance

Coronary arterial dominance is defined by the vessel which gives rise to the posterior descending artery (PDA), which supplies the myocardium of the inferior 1/3rd of the interventricular septum. Most hearts (80-85%) are right dominant where the PDA is supplied by the RCA. The remaining 15-20% ...
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Coronary arterial ectasia

Coronary arterial ectasia (CAE) refers to diffuse dilatation of the coronary arteries. Under some classification systems there is some overlap with the term coronary arterial aneurysms (which is a more focal dilatation). Terminology It is often defined as dilatation of an arterial segment to a...
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Coronary arteries

The coronary arteries arise from the coronary sinuses immediately distal (superior) to the aortic valve and supply the myocardium with oxygenated blood. They branch and encircle the heart to cover its surface with a lacy network resembling perhaps a slightly crooked crown. Gross anatomy The ty...
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Coronary arteriovenous fistula

Coronary arteriovenous fistulas (CAVFs) are rare coronary artery anomalies whereby there is a fistula between a coronary artery and, most commonly, the right side of the cardiac circulation.  Terminology Although a CAVF, in the strictest sense of the term, implies a communication between the c...
Article

Coronary artery aneurysm

Coronary artery aneurysms are an uncommon, predominantly incidental finding. Epidemiology Coronary artery aneurysms are most common in men 3, likely reflecting the increased rates of atherosclerosis in men compared to women. Prevalence varies in the literature between 0.1-5% 4. Clinical prese...
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Coronary artery bypass graft

A coronary artery bypass graft (CABG or CAG) is placed during a surgical procedure to increase blood flow to the myocardium due to coronary stenoses, usually caused by coronary artery disease. Arteries or veins can be grafted during this procedure. Long term outcome of coronary artery bypass gr...
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Coronary artery calcification

Coronary artery calcification is a common incidental finding in asymptomatic patients having CT of the thorax for non-cardiac indications as well as being a significant finding on cardiac CT. Coronary artery calcification is a marker of atherosclerotic plaque and thus coronary heart disease risk...
Article

Coronary artery disease

Coronary artery disease (CAD) is the leading cause of mortality globally.  Clinical presentation CAD is asymptomatic in most of the population. When severe enough it can cause angina or an acute coronary syndrome including myocardial infarction. CAD may also present with heart failure or sudde...
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Coronary Artery Disease - Reporting and Data System - SCCT/ACR/NASCI (2016)

Coronary Artery Disease - Reporting and Data System (CAD-RADSTM) classification is proposed by the Society for Cardiovascular Computed Tomography (SCCT), the American College of Radiology (ACR), and the North American Society for Cardiovascular Imaging (NASCI), last updated in 2016. This recomm...
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Coronary artery dissection

Coronary artery dissection (also known as spontaneous coronary artery dissection or SCAD) is a rare cause of acute coronary syndrome especially in young patients who are otherwise healthy. Epidemiology Coronary artery dissection occurs mainly in young, otherwise health patients especially in f...
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Coronary microvascular obstruction

Microvascular obstruction (MVO), also known as no reflow phenomenon, is an established complication encountered in coronary angioplasty for prolonged acute myocardial infarction.  Pathology The phenomenon results from obstruction of the myocardial microcirculation, which is composed of vessel...
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Coronary MR angiography

Coronary MR angiography (coronary MRA) is a developing approach to imaging the coronary arteries. Advantages of coronary MRA include avoidance of the intravenous iodinated contrast and ionizing radiation used in coronary CT angiography and conventional angiography. A disadvantage of coronary M...
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Coronary ostial dimple

A coronary ostial dimple is a type of congenital coronary artery anomaly where there is a rudiment of the coronary ostium usually followed more distally by proximal coronary stem atresia.
Article

Coronary sinus

The coronary sinus is the major coronary vein. It returns the majority of the left ventricular blood flow to the right atrium. Gross anatomy The coronary sinus courses along the posterior wall of the left atrium into the left atrioventricular groove. It normally drains into the right atrium. T...
Article

Coronary veins

The coronary veins return deoxygenated blood from the myocardium back to the right atrium. Most venous blood returns via the coronary sinus. Coronary venous anatomy is highly variable, but is generally comprised of three groups: cardiac veins which drain into the coronary sinus: great cardiac ...
Article

Cor pulmonale

Cor pulmonale is defined as a failure of the structure and function of the right ventricle in the absence of left ventricular dysfunction. It is caused by an underlying primary disorder of the respiratory system. It has a generally chronic and slowly progressive course, although acute onset or w...
Article

Cor triatriatum

Cor triatriatum is an extremely rare and serious congenital cardiac anomaly.  Epidemiology It is thought to account for ~0.1% of all congenital cardiac anomalies 3,4.  Clinical presentation Clinical presentation depends on: degree of stenosis in the fibromuscular membrane the integrity of ...
Article

Coumadin ridge

A coumadin ridge, also called warfarin ridge or left lateral ridge, is a band-like embryological remnant in the left atrium between the left superior pulmonary vein and the left atrial appendage. It is considered an anatomical variant.  The ridge is formed by the coalition of the left superior ...
Article

Crista terminalis

The crista terminalis is a smooth muscular ridge in the superior aspect of right atrium. It represents the junction between the sinus venosus and the heart. It divides the pectinate muscle origin and the right atrial appendages in the right atrium. Its identification is significant in the deter...
Article

CT chest (summary)

This is a basic article for medical students and other non-radiologists Chest CT is a computed tomography examination of the thoracic cavity performed for a variety of reasons, from suspected cancer to penetrating chest trauma. A CT chest can be performed with or without IV contrast and when I...
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Cyanotic congenital heart disease

A number of entities can present as cyanotic congenital heart disease. These can be divided into those with increased or decreased pulmonary vascularity (pulmonary plethora): increased pulmonary vascularity total anomalous pulmonary venous return (TAPVR) (types I and II) transposition of the ...
Article

Danon disease

Danon disease is an X-linked dominant cause of debilitating cardioskeletal myopathy. Epidemiology Although considered rare, the exact incidence is unknown 1. Clinical presentation Danon disease is characterised by the triad of 1-4: cardiomyopathy the most prominent clinical feature, and ma...
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Deductive echocardiography

Deductive echocardiography is a step-by-step approach in diagnosing and differentiating congenital heart disease. Parameters assessed position of heart  levocardia dextrocardia viscero-atrial situs solitus inversus ambiguus ventricular loop D-loop L-loop conotruncus normal transpos...
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Delayed myocardial enhancement

Delayed myocardial enhancement, as seen on cardiac MRI, occurs when gadolinium contrast material seeps into fibrotic or necrotic myocardial tissue. It is due to a number of aetiologies, and has variable appearances. subendocardial enhancement indicates an ischaemic aetiology transmural enhance...
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Delayed myocardial enhancement on MRI (differential)

Delayed myocardial enhancement can occur in cardiac MR assessment due to a number of causes. They include: myocardial ischaemia: typically subendocardial and follows a vascular territory 1 non-ischaemic cardiomyopathies hypertrophic cardiomyopathy non-ischaemic dilated cardiomyopathy arrhy...
Article

Determination of atrial situs

Atrial situs refers to the relative position of the cardiac atria in relation to abdominal viscera and the midline. Pathology Identification of atrial situs is an important initial step in the antenatal and postnatal diagnosis of cardiac structural and situs anomalies. Radiographic features ...
Article

Dextrocardia

Dextrocardia is a congenital cardiac malrotation in which the heart is situated on the right side of the body (dextroversion) with the apex pointing to the right. Epidemiology Dextrocardia is believed to occur in approximately 1 in 12,000 people 2. Pathology There are two main types of dextr...
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Diagonal branches of the left anterior descending artery

Diagonal branches of the left anterior descending coronary artery supply blood flow to the anterior and anterolateral walls of the left ventricle. There are usually denoted as D1, D2, D3, etc.   There are termed "diagonal" due to them branching from their parent vessel at acute angles. They ext...
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Diastolic pseudogating

Diastolic pseudogating appears as periodic bright and dark signal in arteries such as the aorta as one progresses through a series of images. Synchronization of the cardiac cycle and the pulse sequence results in high signal in the artery during diastole when blood is relatively stationary and l...
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Differential diagnosis for a small cardiothoracic ratio

A small cardiothoracic ratio (CTR) as defined as <42%/0.42 when assessed on a PA chest radiograph, and can be due to number of entities: adrenal insufficiency, e.g. Addison disease heart transplant cachexic state  senility malnutrition bulimia nervosa anorexia nervosa asthmatic paroxysm ...
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Dilated cardiomyopathy

Dilated cardiomyopathy (DCM) is defined as left ventricular chamber dilation with decreased systolic function (FEVG <40%). There may also be right ventricular dysfunction. Causes are related to intrinsic myocardial damage. Pathology The ventricles are dilated, thin-walled and poorly contractil...
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Double density sign (left atrium)

The double-density sign is seen on frontal chest radiographs in the presence of left atrial enlargement, and occurs when the right side of the left atrium pushes behind the right cardiac shadow, indenting the adjacent lung and forming its own distinct silhouette 1-3.  If large enough, the left ...
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Double density sign (osteoid osteoma)

The double density sign, also sometimes clumsily referred to as the hotter spot within hot area sign, is a bone scan sign of an osteoid osteoma. It refers to a central focus of intense uptake (the nidus) within a surrounding lower, but nonetheless increased uptake, rim. See also double densit...
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Double oblique multiplanar reconstruction

Double oblique is a type of multiplanar reconstruction used in cardiac cross-sectional imaging. It is useful for an accurate assessment of the ascending aorta and aortic annulus, and is particularly useful for pre- and post-procedure evaluation of a transcatheter aortic valve replacement (TAVR)....
Article

Double outlet left ventricle

Double outlet left ventricle (DOLV) is an extremely rare congenital cardiac anomaly where both the aorta and pulmonary trunk arise from the anatomical left ventricle. It is usually classified as a conotruncal anomaly and is often associated with a ventricular septal defect with normal continuity...
Article

Double outlet right ventricle

Double outlet right ventricle (DORV) is a congenital cardiac anomaly where both the aorta and pulmonary trunk arise from the morphologically right ventricle. It is reported to account for ~2% of congenital cardiac defects 1. It is usually classed as a conotruncal anomaly. There is almost always ...
Article

Double switch procedure

The double switch procedure is a surgical technique used to repair congenitally corrected transposition of the great arteries (L-TGA), which is a cardiovascular anomaly with atrioventricular and ventriculoarterial discordance. The procedure consists of any of the following surgical combinations...
Article

Down syndrome

Down syndrome (or trisomy 21) is the most common trisomy and also the commonest chromosomal disorder. It is a major cause of intellectual disability, and also has numerous multi-system manifestations. Epidemiology According to the world health organisation (WHO), the approximate worldwide inci...
Article

Dressler syndrome

Dressler syndrome (DS) is a delayed immune-mediated or secondary pericarditis developing weeks to months after a myocardial infarction (MI). Terminology Dressler syndrome is not to be confused with pericarditis epistenocardica (which is seen earlier in the post-MI period) and is considered a r...
Article

Drug and toxin induced pulmonary hypertension

Drug and toxin induced pulmonary hypertension is one of the causes of pulmonary arterial hypertension. It falls under group 1.3 under the Dana point classification system of pulmonary hypertension.  Pathology A wide range of difference drugs have been associated with developing pulmonary hyper...
Article

D-SPECT

D-SPECT represents the next step in the evolution of SPECT technology and is based on a unique acquisition geometry. It has nine arrays of cadmium zinc telluride (CZT) detectors, each of which rotates around its central axis with programmable angular rotation 1. The detectors are very compact al...
Article

Duchenne muscular dystrophy

Duchenne muscular dystrophy (DMD) is a dystrophinopathy and the most common muscular dystrophy. Epidemiology DMD has an incidence of 1 in 3500 to 5000 males 1,2. The condition is extremely rare in females due to its inheritance pattern, as discussed below 1. Clinical presentation The charact...
Article

Ductus arteriosus

The ductus arteriosum (or arteriosus) is the thick short conduit for blood to bypass the non-ventilated lungs in the fetus. It is located between and connects the proximal left pulmonary artery and the undersurface of the aortic arch distal to the origin of the last branch of the arch, at the ao...
Article

Duke criteria for infective endocarditis

The Duke criteria are a set of clinical criteria set forward for the diagnosis of infective endocarditis For diagnosis the requirement is:  2 major and 1 minor criteria or 1 major and 3 minor criteria or 5 minor criteria Major criteria positive blood cultures for infective endocarditis ty...
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Dysphagia megalatriensis

Dysphagia megalatriensis, also known as cardiovascular dysphagia or cardiac dysphagia, is an impairment of swallowing due to oesophageal compression from a dilated left atrium.  Clinical presentation Presentation is generally with mild dysphagia, although a minority of patients will have dysph...
Article

Earth-heart sign

The earth-heart sign is a newly recognised sign of cardiac compromise that may be seen on chest radiographs of patients with tension pneumomediastinum. The substantial pressure exerted on the heart by the gas trapped in the mediastinum with subsequent impairment of central venous return and obs...
Article

Ebstein anomaly

Ebstein anomaly is an uncommon congenital cardiac anomaly, characterised by a variable developmental anomaly of the tricuspid valve. Epidemiology The anomaly accounts for only ~0.5% of congenital cardiac defects 6-7, although it is the most common cause of congenital tricuspid regurgitation. T...
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Echogenic intracardiac focus

Echogenic intracardiac focus (EIF) is a relatively common sonographic observation that may be present on an antenatal ultrasound scan. Epidemiology They are thought to be present in ~4-5% of karyotypically normal fetuses. They may be more common in the Asian population 5.  Pathology They are...
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Ectopia cordis

Ectopia cordis is an extremely rare congenital malformation where the heart is located partially or totally outside the thoracic cavity. The four main ectopic positions are: adjacent to the thorax: ~60% abdominal: 15-30% thoracoabdominal: 7-18%  cervical: ~3% Epidemiology The estimated pre...
Article

Egg-on-a-string sign (heart)

Egg-on-a-string sign, also referred to as egg on its side, refers to the cardiomediastinal silhouette seen in transposition of the great arteries (TGA). The heart appears globular due to an abnormal convexity of the right atrial border and left atrial enlargement and therefore appears like an ...
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Eisenmenger complex

Eisenmenger complex is a specific subset of Eisenmenger syndrome, and consists of: ventricular septal defect (VSD) severe pulmonary arterial hypertension resulting in shunt reversal and cyanosis
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Elliott et al. classification of cardiomyopathies

The Elliott et al. classification system of cardiomyopathies is one of the cardiomyopathy classification systems. This was published by the European Society of Cardiology Working Group on Myocardial and Pericardial Diseases. This places emphasis on phenotypic classification 1-2. See also cardi...
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Endocardial fibroelastosis

Endocardial fibroelastosis (EFE) is a rare cardiac condition which is classically described in the paediatric population (typically first two years). It is one of the causes for infants to present with unexplained heart failure.  Pathology The condition results from increasing amounts of fibro...
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Endomyocardial fibrosis

Endomyocardial fibrosis (EMF) is an idiopathic disorder characterised by the development of restrictive cardiomyopathy. Epidemiology It usually occurs in tropical and subtropical regions of the world.There may be a greater predilection in children and adolescents.  Associations It can occur ...
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Enlarged azygos vein

An enlarged/dilated azygos vein may result from a number of physiological as well as pathological causes. The enlarged azygos vein may be seen as a widened right paratracheal/paraspinal stripe on a frontal chest radiograph. Causes for dilatation There are a number of physiological causes for e...
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Enlarged pulmonary trunk on chest radiography (differential)

The differential of an enlarged pulmonary trunk/main pulmonary artery on chest radiography includes:  normal may appear prominent in young patients especially women projectional rotation lordotic view rotation of the heart pectus excavatum left lower lobe collapse pulmonary arterial hyp...
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Eosinophilic endocarditis

Eosinophilic endocarditis (or Loeffler endocarditis) is one of the cardiac manifestations of idiopathic hypereosinophilic syndrome. It also considered a form of cardiomyopathy. Prognosis It has a variable prognosis but can sometimes be fatal 4. History and etymology It is named after Wilhelm...
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Epicardial fat pads

Epicardial (pericardial) fat pads are normal structures that lie in the cardiophrenic angle, more so on the right. Unsurprisingly, they are more prominent in obese patients.  Pathology They can be affected by fat necrosis, see: epipericardial fat necrosis.  Radiographic features Plain radiog...
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Epicardial lipomatosis

Epicardial lipomatosis or epicaridal lipomatous hypertrophy is a form of cardiac lipomatosis and is characterised by accumulation of non-encapsulated mature adipose tissue in the epicardial space due to hyperplasia of lipocytes. Its exact aetiology is not well known, but it may be associated wit...
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Epicardial pacing wires

Epicardial pacing wires allow rapid commencement of atrial and/or ventricular pacing in the event of a perioperative cardiac arrhythmia that has the potential to cause significant haemodynamic compromise. They are usually inserted during open heart surgery, and especially in those with congenit...
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Eustachian valve

The Eustachian valve (also known as the "valve of the inferior vena cava") is a ridge of variable thickness in the inferior right atrium. It is a remnant of a fetal structure that directed incoming oxygenated blood to the foramen ovale and away from the right atrium.   Incomplete regression of ...
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Fetal atrial fibrillation

Fetal atrial fibrillation is a type of fetal tachyarrhythmia and usually has atrial rate of 400 beat per minute and a completely irregular ventricular rhythm.  Radiographic features Antanatal ultrasound - echocardiography The artial contractions are usually too faint to be detected by M Mode ...
Article

Fetal atrial flutter

Fetal atrial flutter is the second most common fetal tachyarrhythmia and can account for up to 30% of such cases 1,2.  Clinical presentation As with other tachyarrhythmias, it is often detected in the 3rd trimester. Pathology It has a typical atrial rate of 300-600 beats per minute (bpm) and...
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Fetal bradyarrhythmia

Fetal bradyarrhythmia refers to an abnormally low fetal heart rate (less than 100-110 beats per minute 3,7) as well as being irregular, i.e. irregular fetal bradycardia. Pathology A fetal bradyarrhythmia can fall into several types which include fetal partial atrioventricular block (PAVB) fe...
Article

Fetal bradycardia

Fetal bradycardia refers to an abnormally low fetal heart rate, a potentially ominous finding. A sustained first trimester heart rate below 100 beats per minute (bpm) is generally considered bradycardic. The average fetal heart rate changes during pregnancy, however, and some consider the lower ...
Article

Fetal cardiac tumours

Fetal cardiac tumours refer to primary cardiac tumours that can present in the in utero population.  Epidemiology Fetal cardiac tumours are rare; the prevalence, reported from autopsy studies of patients of all ages, varies from 0.0017-0.28 % 2. Pathology Known cardiac tumour types that pres...
Article

Fetal cardiomegaly

Fetal cardiomegaly (FC) refers to an enlarged fetal heart. It is variably defined with some sources stating the cut-off as a fetal cardio-thoracic circumference above two standard deviations 7.  Pathology It can arise from a number of situations: congenital cardiac anomalies: particularly tr...
Article

Fetal cardiomyopathy

Fetal cardiomyopathy refers to a very rare situation where a cardiomyopathy occurs in utero. It is often a diagnosis of exclusion where, by definition, there is an absence of an underlying congenital cardiac morphological anomaly. Epidemiology The estimated incidence is variable with the high ...
Article

Fetal cardiothoracic circumference ratio

Fetal cardiothoracic (C/T) circumference ratio is a parameter than can be used in assessment of fetal cardiac and thoracic/chest wall anomalies. It is the ratio of the cardiac circumference to the thoracic circumference and may be easily measured on fetal ultrasound/echocardiography.  Radiograp...
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Fetal complete atrioventricular block

Fetal congenital complete heart block (CAVB) is a rare cardiac conduction abnormality which is associated with high morbidity and mortality. It is considered the commonest of fetal bradyarrhymias. Epidemiology The estimated prevalence of complete heart block in newborns is at ~1 in 20,000. Pa...
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Fetal echocardiography views

A standard fetal echocardiogram consists of several specific views which can be obtained to optimise visualisation of different structures and anomalies. They include: Basic views abdominal situs view / transverse view of abdomen four chamber view left ventricular outflow tract view (or a fi...
Article

Fetal pericardial effusion

Fetal pericardial effusions (FPE) occur when there is an accumulation of pericardial fluid in utero. In order to be considered as abnormal, it is generally accepted that the pericardial fluid thickness should be greater than 2 mm. Epidemiology The estimated incidence is at ~ 2% of pregnancies ...
Article

Fetal pericardial teratoma

Fetal pericardial teratomas are rare pericardial teratomas that present in utero. They are an uncommon primary cardiac tumour occurring in a fetus. Pathology It is a type of germ cell tumour and arises from pluripotent cells derived from all three germinal layers. In contrast to ovarian terato...
Article

Fetal premature atrial contractions

Fetal premature atrial contractions are a type of extrasystoles that can be occasionally detected in fetal heart monitoring. They along with fetal premature ventricular contractions (PVC's) account for the majority of in utero rhythm disturbances. Pathology They may arise from immaturity in th...
Article

Fetal premature ventricular contractions

Fetal premature ventricular contractions (FPVC) are a type ectopic ventricular contractions detected in utero. They are a type of extrasystoles. Premature ventricular contractions are often followed by a compensatory pause due to the refractory state of the conduction system; the next conducted...
Article

Fetal right ventricular enlargement

Fetal right ventricular (RV) enlargement is an infrequently encountered situation in antenatal imaging. Pathology The right ventricle is a dominant ventricle in in utero life. RV enlargement can occur with a number cardiac as well as non cardiac anomalies cardiac hypoplastic left heart syndr...
Article

Fetal sinus bradycardia

A fetal sinus bradycardia is a sub type of fetal bradycardia where the fetal heart rate is abnormally slow ( less than 100 beat per minute) but runs at the regular rate with sinus rhythm. Pathology Associations congenital long QT syndrome 1 maternal anti Ro antibodies 2-3
Article

Fetal supraventricular tachycardia

Fetal supraventricular tachycardia (SVT) is considered the most common type of fetal tachyarrhythmia and can account for 60-90% of such cases. Pathology It has a typical ventricular rate of 230-280 beats per minute (bpm) 1 and isoften associated with an accessory AV conduction pathway. There i...
Article

Fetal tachyarrhythmia

Fetal tachyarrhythmia refers to an irregular increase in fetal heart rate.  Epidemiology Depending on its exact definition, the prevalance rate is thought to be around 0.5-1% of pregnancies.  Clinical presentation Many cases tend to be discovered in the 3rd trimester.  Pathology Sub types ...
Article

Fetal tachycardia

Fetal tachycardia is an abnormal increase in the fetal heart rate. It is variably defined as a heart rate above 160-180 beats per minute (bpm) and typically ranges between 170-220 bpm (higher rates can occur with tachyarrhythmias). Epidemiology The estimated prevalence is ~0.4-1% of pregnancie...
Article

Fibromuscular dysplasia

Fibromuscular dysplasia (FMD) is a heterogeneous group of vascular lesions characterised by an idiopathic, non-inflammatory, and non-atherosclerotic angiopathy of small and medium-sized arteries. Epidemiology The prevalence is unknown 7. It is most common in young women with a female to male r...
Article

Figure of eight appearance

The following lesions may resemble a figure of eight (sometimes referred to as snowman shaped): supracardiac variety of total anomalous pulmonary venous return 1 pituitary macroadenoma with suprasellar extension 2 intraspinal neurofibroma with extraspinal extension through neural foramina di...
Article

Finger clubbing

Finger clubbing, also called "drumstick fingers", is a common clinical sign in patients with heart or lung disease. The term is used to describe an enlargement of the distal phalanges of the fingers, giving them a drumstick or club-like appearance.  Clinical Presentation Finger clubbing presen...
Article

Focus‐assessed transthoracic echocardiography

FATE (focus‐assessed transthoracic echocardiography) is a goal-directed protocol used in critical care for indications such as haemodynamic instability, shock, and pulseless electrical activity (PEA) arrest 1. The protocol is designed as a series of questions as follows: does the left ventricl...

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