[Isolated so-called "alone" atrial fibrillation].

A 49-year-old man with paroxysmal atrial fibrillation was studied in hospital for detection of the cause of arrhythmia and was qualified into the group of the so called alone atrial fibrillation, with healthy cardiovascular system. He was treated successfully with amiodarone++. This type of atrial fibrillation occurs in only 6% of cases of atrial fibrillation, but is possible occurrence should be taken into consideration in differential diagnosis.