When left atrial enlargement occurs ... than 120 milliseconds OR The downward deflection of the P wave in lead V1 is greater than 40 milliseconds in length, with greater than 1 millimeter negative ...
Left atrial enlargement refers to dilation of the left ... The downward deflection of the P wave in lead V1 greater than 40 milliseconds in length AND greater than 1 millimeter negative deflection ...
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