Columbia subject headings:
Arrhythmia--Congresses.
Electrocardiography--Congresses.
Heart conduction system--Congresses.
Heart--Ventricles--Diseases--Congresses.
Harvard subject headings:
Arrhythmia--Congresses.
Electrocardiography--Congresses
Heart conduction system--Congresses.
Heart--Ventricles--Diseases--Congresses.
Princeton subject headings: