Right Atrium

Size

Dilated if bigger than LA
A4C – Measure minor (width) and major (length) axis. Planimetry RA.

RA1


RAP

Assume it is 10 or
Measure IVC in inspiration and expiration.

RA2

Obviously measuring it directly via a CVC is more accurate. 

Normal structures which may be seen in RA

Eustachian valve – thin flap at junction of IVC and RA. Size and mobility variable.
Coronary sinus.
Chiari network – web across RA in 2% population. Of no significance.

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