On an ECG, the QRS complex will be abnormally shaped when looking at ventricular ectopic activity, often it occurs earlier with an absent P wave. It can be perceived as a skipped beat on both the ECG and through normal pulse-taking. During atrial ectopic activity where the P wave is normally rounded can be inverted or peaked. However the QRS complex and T waves appear relatively normal. Conversely, during junctional ectopic activity the P wave is frequently absent or can be hidden in the QRS complex.
Ectopic pacemaker
Wandering atrial pacemaker
Ectopic beat
Junctional ectopic tachycardia
Pre-excitation syndrome
Sinus arrhythmia
Benign early repolarization
Supraventricular tachycardia