ECG Quest > Shapes > P wave > Asymmetrical P in V1

Asymmetrical P in V1

The P wave in V1 is often biphasic. Normally the positive and negative components are equal. If the negative component is larger than normal (>1 mm wide and tall), there may be left atrial enlargement. If the positive component is taller than normal (>1.5 mm), there may be right atrial enlargement. This sign is not diagnostic.

See also: P wave

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