Loss of P wave

A finding on an electrocardiogram (ECG) indicating the absence of atrial depolarization due to abnormal electrical activity of the heart's upper chambers (atria).

Common causes:

• Atrial fibrillation

• Atrial flutter

• Sinus arrest

• P wave hidden in the QRS complex (junctional or AV nodal tachycardias)

• Hyperkalemia

• Technical issue: Loose, wrong, or poorly placed skin sensors