Birkbeck et al developed equations for estimating left atrial volume determined by 2-dimensional echocardiography. Features of the P wave in lead II correlated with left atrial volume. The authors are from the University of Kansas.
Parameters:
(1) duration of the P wave in lead II in milliseconds
(2) area under the P wave in lead II in milliseconds•millivolts
left atrial volume in mL per meter squared BSA =
= (0.20 * (P wave duration in milliseconds)) + 7.99
left atrial volume in mL per meter squared BSA =
= (1.67 * (P wave area in milliseconds•millivolts)) + 18.6
Performance is best when interatrial conduction delay is present (Ariyarajah et al).
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