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What is a Congenital Heart Defect? A congenital heart defect (CHD) is an irregularity in the heart or vessel structure that exists at birth. One of the most common congenital heart defects is an atrial septal defect (ASD), including patent foramen ovale (PFO).
While ASD represents a true defect in the fossa ovalis region with varying magnitude and direction of intracardiac shunting depending on the size of the defect and relative filling pressures of the ventricles, PFO is as a result of an incompetent fossa ovalis valve with up to 25% prevalence in the general population 1 ...
The reported prevalence of patent foramen ovale (PFO) in the general population is variable. It ranges between 8.6 and 42% ing to the population studied and the imaging technique used.
CT diagnosis of PFO was defined as (1) a channel-like appearance of the interatrial septum (IAS) and (2) a contrast agent jet flow from the left atrium (LA) to the right atrium (RA). ASD was defined as (1) the IAS resembling a membrane with a hole and (2) a contrast jet flow between the two atria.
Transoesophageal echocardiography (TOE) is superior to transthoracic echocardiography (TTE) for the diagnosis of a PFO and delineation of its morphologic details (figs 1 and 2).
Patent foramen ovale (PFO) is a common congenital atrial septal defect with an incidence of 15–35% in the adult population.
The patent foramen ovale (PFO) is a slitlike interatrial opening that is present in about 27% of the general population. It is 1 of the major causes of a cardiac right‐to‐left shunt (RLS). An atrial septal aneurysm (ASA) is a congenital bulging of the atrial septum involving the fossa ovalis region.
Conclusions: Atrial septal defects and PFOs can be differentiated using the characteristic direction of the contrast jet from the left to right atrium and the appearance of the atrial septum on coronary CT angiography.
PFO closure is usually considered to prevent recurrent embolic stroke/systemic arterial embolization, ASD closure is indicated in patients with large left-to-right shunt, right ventricular volume overload, and normal pulmonary vascular resistance.