A wide P wave is more than 3 small squares wide (120 ms) at standard settings. This can be associated with left atrial enlargement, but it is not diagnostic. If the P wave is wide and notched, it may be known as P mitrale because of the association between left atrial enlargement and mitral valve disease.
See also: P wave
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- Hampton, J and Hampton, J (2019) - The ECG Made Easy, 9th edn, Elsevier