Asymptomatic
ectopicEctopic pregnancy atrialAtrial fibrillation/flutter
Atrial myxoma
Left atrial myxoma
Right atrial myxoma rhythms aren't a problem but do put you at risk for developing atrial tachycardia later on, a relatively benign condition which if symptomatic can be treated with medications or an ablation procedure. If this is an incidental finding and you aren't having any symptoms from it I wouldn't even worry about it. If is also possible that at the time the ECG was taken you had some ectopic atrial rhythm, but normally, your native rhythm predominates. Again, I wouldn't be concerned about this at all as long as your aren't having any symptoms.