Ariyarajah et al correlated left atrial volume with P wave duration in the electrocardiogram. The authors are from Thomas Jefferson University, Mahidol University in Bangkok and the University of Massachusetts.



(1) duration of the P wave in any lead in milliseconds


left atrial volume in mL per meter squared BSA =

= (0.28 * (P wave duration in milliseconds)) - 3.21



• In Figure 4 the longest P wave duration in a 12-lead ECG was used for the calculation.


Performance is best when interatrial conduction delay is present.


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