![]() ![]() ![]() The duration of the normal “sinus P wave” is greater than 20 s that is [". The axis of the normal sinus P wave lies between 0° and +75°. The morphology of normal sinus P Wave can be determined by its smooth colour, Biphasic in V1, and it’s Monophasic in lead II. The normal sinus P wave must be upwards right that is leading I and II and also inverted in a VR. The duration of the P Wave that is determined to be of normal state is more than 0.12 s which is greater than 120 ms or the three small squares (litfl, 2022). “P wave” is determined as "positive deflection" on ECGs or electrocardiograms and helps in the representation of the "atrial depolarization". The left atrium depolarization is mainly responsible for the P wave early part and left atrium depolarization is generally responsible for the terminal and middle parts of this P wave. In a healthy human, this P wave originates at SA which means a sinoatrial node and then disperses into both the right and left atria. With an accurate understanding of the morphology of abnormal and normal P waves, one can also understand the crucial part of the interception of ECG or electrocardiogram. ![]() Sometimes abnormalities can be found in P Wave and PR segment morphology where clinical pathology timing can be significantly indicative. P Wave determines the small positive deflection that can be seen in the isoelectric baseline occurring before the complex of QRS. ![]()
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