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Diagnostic ultrasound ( PDFDrive )

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CHAPTER 37 The Fetal Heart 1283

RA

RV

LA

LV

A

B

RV

RA

C

LV

LA

FIG. 37.21 Foraminal Flap and Foramen Ovale. (A) Linear

appearance of the foraminal lap (arrow) as it enters the left atrium

(LA). (B) Circular appearance of the foraminal lap (arrow) entering

the LA. (C) Color Doppler ultrasound in a subcostal four-chamber view

shows normal low through the foramen ovale from the LA to the

right atrium (RA). LV, Left ventricle; RV, right ventricle.

Pulmonary valve

RA

Tricuspid

valve

Outlet

Membranous

LA

LV

RV

Inlet

Trabecular

FIG. 37.23 Interventricular Septum Viewed From Right Ventricle.

The membranous septum and the three portions of the muscular

septum (inlet, outlet, and trabecular) are demonstrated. Ventricular septal

defects may occur in any of these locations.

FIG. 37.22 Four-chamber view shows an ostium primum atrial

septal defect (arrow) in a fetus with an atrioventricular septal defect.

LA, Left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle.

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