EKG
P wave is either: Absent, Abnormal with PR < 120ms, OR Retrograde, which may be inverted in inferior leads<unk>  arrives before next sinus beat
Followed by compensatory pause
From AV node region, with ventricular response usually normal, so QRS complexes usually narrow
If conduction is abnormal, may have right bundle branch block morphology
P wave is either: Absent, Abnormal with PR < 120ms, OR Retrograde, which may be inverted in inferior leads<unk>  arrives before next sinus beat
Followed by compensatory pause
From AV node region, with ventricular response usually normal, so QRS complexes usually narrow
If conduction is abnormal, may have right bundle branch block morphology
Premature junctional complex
Arrhythmias:
Premature junctional contraction
Narrow-complex tachycardias
Premature atrial contraction
Wide-complex tachycardias
Premature ventricular contraction
AV blocks