Also explained as the absence ... when P waves (represents atrial depolarization) are seen at different rates than the QRS complex. This is present in only a small percentage of VT ECG tracings ...

Decreased amplitude of the P waves, an increase in the PR interval, and bradycardia in the form of AV blocks occur as the potassium level exceeds 7.0. Absence of the P waves and, eventually ...

These ECG voltage attenuations are of extracardiac mechanism, and impact the amplitude of QRS complexes, P-waves, and T-waves ... more than a single ECG tracing. Incorporation of these ideas ...

Figure 18B shows the 12-lead ECG of the entrainment tracing ... manner as the paced chamber in the absence of tachycardia (fully paced QRS or P wave); in the latter situation fusion is lacking ...