In a non-conducted premature atrial contraction (PAC), where may the P wave be located?

In the context of a non-conducted premature atrial contraction (PAC), the P wave is often located "buried in the preceding T wave." This phenomenon occurs because the PAC happens too soon in the cardiac cycle for the heart to respond normally. As a result, the electrical impulse generated by the PAC can coincide with the repolarization phase seen in the T wave of the preceding heartbeat. This overlap can make the P wave difficult to discern visually but is characteristic of this type of PAC.

The notion of a P wave being located prominently following the T wave would imply that the atrial contraction is fully conducted, which isn't the case in a non-conducted PAC, as the impulse fails to generate a QRS complex. An absent P wave in the EKG readings would indicate a total loss of atrial activity, which isn't consistent with a non-conducted PAC, where an atrial impulse is indeed generated. The idea of a P wave being isolated prior to the QRS complex would typically describe a conducted PAC, rather than a non-conducted one, where the impulse does not lead to ventricular depolarization.