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Detailed Description of the Four-Chamber View at 28 Weeks
The four-chamber view is obtained through a transverse sweep of the fetal chest and represents the most critical screening plane for detecting structural cardiac abnormalities 1, 2. At 28 weeks gestation, visualization rates are excellent, with studies showing 88.7-100% successful identification of this view 3.
Key Anatomical Features Visible at This Gestational Age
In the four-chamber view at 28 weeks, you should identify:
- Four cardiac chambers of approximately equal size (right atrium, left atrium, right ventricle, left ventricle)
- Interatrial septum with the foramen ovale flap
- Interventricular septum extending to the cardiac apex
- Atrioventricular valves (tricuspid and mitral) opening and closing symmetrically
- Moderator band in the right ventricle
- Pulmonary veins entering the left atrium
- Cardiac axis at approximately 45 degrees to the left 4
- Cardiothoracic ratio around 0.27 4
Technical Considerations
At 28 weeks, the four-chamber view is highly reliable for screening 5. The gestational age provides optimal visualization compared to earlier timepoints, where success rates are lower (only 33-40% at 14 weeks) 5. Real-time evaluation improves visualization over static images alone 5.
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