Regular
AV Node Independent
Sinus tachycardia
Atrial tachycardia (uni-focal or multi-focal)
Atrial fibrillation
Atrial flutter
Idiopathic fascicular left ventricular tachycardia
AV Node Dependent
Paroxysmal supraventricular tachycardia (PSVT)
AV node re-entry tachycardia (AVNRT)
AV re-entry tachycardia (AVRT)<unk> 
Wolff–Parkinson–White syndrome
Junctional tachycardia
Irregular
Multifocal atrial tachycardia (MAT)
Sinus tachycardia with frequent PACs, PJCs, PVCs
Atrial fibrillation
Atrial fibrillation with RVR
Atrial flutter with variable conduction
Digoxin Toxicity
AV Node Independent
Sinus tachycardia
Atrial tachycardia (uni-focal or multi-focal)
Atrial fibrillation
Atrial flutter
Idiopathic fascicular left ventricular tachycardia
AV Node Dependent
Paroxysmal supraventricular tachycardia (PSVT)
AV node re-entry tachycardia (AVNRT)
AV re-entry tachycardia (AVRT)<unk> 
Wolff–Parkinson–White syndrome
Junctional tachycardia
Sinus tachycardia
Atrial tachycardia (uni-focal or multi-focal)
Atrial fibrillation
Atrial flutter
Idiopathic fascicular left ventricular tachycardia
Paroxysmal supraventricular tachycardia (PSVT)
AV node re-entry tachycardia (AVNRT)
AV re-entry tachycardia (AVRT)<unk> 
Wolff–Parkinson–White syndrome
Junctional tachycardia
AV node re-entry tachycardia (AVNRT)
AV re-entry tachycardia (AVRT)<unk> 
Wolff–Parkinson–White syndrome<unk> 
Wolff–Parkinson–White syndrome
Multifocal atrial tachycardia (MAT)
Sinus tachycardia with frequent PACs, PJCs, PVCs
Atrial fibrillation
Atrial fibrillation with RVR
Atrial flutter with variable conduction
Digoxin Toxicity
Atrial fibrillation with RVR
Arrhythmias:
Narrow-complex tachycardias
Wide-complex tachycardias
AV blocks
Second Degree AV Block Type I (Wenckeback)
Second Degree AV Block Type II
Third Degree AV Block
Premature atrial contraction
Premature junctional contraction
Premature ventricular contraction
Sick sinus syndrome
Non-arrhythmic cardiac causes:
Acute coronary syndrome
Cardiomyopathy
Congenital heart disease
Congestive heart failure (CHF)
Mitral valve prolapse
Pacemaker complication
Pericarditis
Myocarditis
Valvular disease
Psychiatric causes:
Panic attack
Anxiety
Somatic Symptom Disorder
Drugs and Medications:
Alcohol
Caffeine
Drugs of abuse (e.g. cocaine)
Medications (e.g. digoxin, theophylline)
Tobacco
Misc
Anemia
Hyperthyroidism
Pulmonary embolism
Dehydration
Sepsis
Pheochromocytoma
Narrow-complex tachycardias
Wide-complex tachycardias
AV blocks
Second Degree AV Block Type I (Wenckeback)
Second Degree AV Block Type II
Third Degree AV Block
Premature atrial contraction
Premature junctional contraction
Premature ventricular contraction
Sick sinus syndrome
Second Degree AV Block Type I (Wenckeback)
Second Degree AV Block Type II
Third Degree AV Block
Acute coronary syndrome
Cardiomyopathy
Congenital heart disease
Congestive heart failure (CHF)
Mitral valve prolapse
Pacemaker complication
Pericarditis
Myocarditis
Valvular disease
Panic attack
Anxiety
Somatic Symptom Disorder
Alcohol
Caffeine
Drugs of abuse (e.g. cocaine)
Medications (e.g. digoxin, theophylline)
Tobacco
Anemia
Hyperthyroidism
Pulmonary embolism
Dehydration
Sepsis
Pheochromocytoma
Lown-Ganong-Levine syndrome
Regular
Marfan syndrome
AV Node Independent
Paget-Schroetter syndrome
Sinus tachycardia
Dressler's syndrome
Atrial tachycardia 