The morphology of the P wave will not be similar to the sinus P wave, which is normally upright in lead II and biphasic in lead V1. Often, the P wave is inverted in lead II, if it can be seen at all.

Type I is deep inverted T waves in the precordial leads and type II is biphasic T waves in V1 through V3. ... requires three different P wave morphologies in one ECG with a QRS complex rate of < 100.

There is a P wave before each QRS complex (+) with a stable but prolonged PR interval (0.24 sec). The P waves a re positive in leads I, II, aVF, and V4-V6 and hence there is a sinus rhythm.

ECG Challenge: Unusual Heart Sound in a Woman With CV Risk Factors. Philip J. Podrid, MD. ... while the P wave in V3 is biphasic and has normal morphology usually seen in lead V1.

For biphasic P waves, both positive and negative deflections from baseline were included in total P-wave duration. Prolonged P-wave duration was present if the maximum P-wave duration in any lead ...