Abbreviation:<unk> 
Digoxin
CHF
Hypokalemia
Alkalosis
Hypoxia
Myocardial infarction
Cardiomyopathy
Drugs
Premature ventricular contraction
Arrhythmias:
Premature atrial contraction
Narrow-complex tachycardias
Premature junctional contraction
Wide-complex tachycardias
Wandering atrial pacemaker
AV blocks