Etiology specific
Consideration for Holter monitoring (or similar) with outpatient cardiologist if clinically stable for discharge home
Recommend avoidance of stimulants and alcohol pending outpatient follow-up
Criteria for admission from Management of patients with<unk> : a position paper from the European Heart Rhythm Association
Palpitations
Arrhythmias:
Chest pain 
Narrow-complex tachycardias
Heart murmurs
Wide-complex tachycardias
Hypopyon
AV blocks