Right Atrium

Right Atrium

RA is more difficult to estimate than LA. There are only a few echocardiographic measurements. In many cases, we look at the AP4CH to the ratio LA / RA: LA is normally slightly larger.

 

RA size
Parameter MALE FEMALE
Mean ± SD Mean ± SD
RA minor axis diameter (cm/m²) 1.9 ± 0.3 1.9 ± 0.3
RA major axis diameter (cm/m²) 2.5 ± 0.3 2.4 ± 0.3
(2D echo) RA volume (mL/m²) 21 ± 6 25 ± 7

 

 

RA pressure
Inferior Vena Cava size Estimation RA pressure
Normal <21mm, collaps >50% 3 mmHg (range 0–5 mmHg)
Borderline <21mm, collaps <50% 8 mmHg (range 5–10 mmHg)
Borderline >21mm, collaps >50% 8 mmHg (range 5–10 mmHg)
Dilated >21mm, collaps < 50% 15 mmHg (range 10- 20 mmHg)

 

 

 

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