ANATOMY

Detailed explanation-1: -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.

Detailed explanation-2: -P Wave. The P wave represents atrial contraction. P waves are normally evenly rounded and either positive or negative in all leads except V1, where a biphasic wave is sometimes seen. Its duration should be less than 0.12 seconds and its amplitude less than 0.25 mV.

Detailed explanation-3: -The atrial rate is indicated by the P waves. There are almost exactly five large boxes between P waves, indicating an atrial rate of 60 bpm. There are a total of ten P waves on this strip (difficult to see some of them, as they are intermittently buried in the QRS complexes) and 10 x 6 = 60.

Detailed explanation-4: -His labeling of the primitive tracing was then mixed: A and B, the first letters of the alphabet, were used to indicate ventricular events, and P, from near the middle of the alphabet, was used to indicate atrial events.

Detailed explanation-5: -P wave in the ECG represents the electrical excitation of the atria (depolarisation) which causes contraction of both the atria.