<P> The P wave in the ECG represents atrial depolarization, which results in atrial contraction, or atrial systole . </P> <Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table>

The p-wave phase of an electrocardiogram (ecg) represents