What Causes P Waves
The P Wave Indicates Atrial Depolarization. the P Wave Occurs When the Sinus Node, Also Known as the Sinoatrial Node, Creates an Action Potential That...
The P wave indicates atrial depolarization. The P wave occurs when the sinus node, also known as the sinoatrial node, creates an action potential that depolarizes the atria.
What do P waves indicate?
The P wave represents the electrical depolarization of the atria. In a healthy person, this originates at the sinoatrial node (SA node) and disperses into both left and right atria.
What happens during the P wave?
The P wave represents the depolarization of the left and right atrium and also corresponds to atrial contraction. Strictly speaking, the atria contract a split second after the P wave begins. Because it is so small, atrial repolarization is usually not visible on ECG.
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