The P wave amplitude in lead II > 2.5 mm, or; The upward deflection of the P wave in lead V1 > 1.5 mm in amplitude. Enlarge . ECG Examples: Right Atrial Enlargement (ECG Example 1) ...

P-wave Duration. Characteristically, P waves associated with parahisian AT were narrower in most of the 12 leads. Compared with that of CS ostium, lead aVL showed the most significant difference ...

Because the atrial rate is so fast, and the action potentials produced are of such low amplitude, P waves will not be seen on the ECG in patients with atrial fibrillation.

The mean atrial capture threshold was 0.82 V, while the mean P-wave amplitude was 3.58 mV, according to the researchers, who also reported that among 7% with a P-wave amplitude of <1.0 mV, no one ...

A decrease in P-wave amplitude was the most common notable change in device parameters (occurred in 1% of patients) immediately after MRI. At long-term follow-up, ...