AMA Category 1 Credit for Physicians Only.
ASRT CME is not available.
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The left atrium is usually measured in the anterior-posterior or medial-lateral dimensions. The AP dimension is 38 Â± 6 mm and the ML dimension is 39 Â± 7 mm.These dimensions are made using TTE rather than TEE. The LA volume is 22 Â± 6 mls / m2. LA size has also been compared to the aortic root diameter (SOV to SOV diameter). Normally, the ratio of aortic root:left atrial diameter is 1:1.
TEE has 4 views of the LA but the views may not yield accurate results. The ME AVSAX view where the LA diameter is measured has yielded a good correlation with the LA diameter by TTE. Still, TEE will underestimate the LA diameter by 6-16%. Another study found that the ME basal long axis view (transducer at 120-150 degrees) correlated with TTE than other views.
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