Atrial standstill is a rare arrhythmia and several cases of atrial standstill have been described in acute myocarditis, hypertrophic cardiomyopathy or dilated cardiomyopathy. However, left atrial standstill with paroxysmal atrial fibrillation and atrial flutter after pericardial effusion has not been reported. Here, we reported a case with left atrial standstill, paroxysmal atrial fibrillation and atrial flutter who successfully received radiofrequency ablation.