 , C01BA — Antiarrhythmics, class Ia , C01B — ANTIARRHYTHMICS, CLASS I AND III , C01 — CARDIAC THERAPY , C — CARDIOVASCULAR SYSTEM , C01BA — Antiarrhythmics, class Ia , C01B — ANTIARRHYTHMICS, CLASS I AND III , C01 — CARDIAC THERAPY , C — CARDIOVASCULAR SYSTEM , C01BA — Antiarrhythmics, class Ia , C01B — ANTIARRHYTHMICS, CLASS I AND III , C01 — CARDIAC THERAPY , C — CARDIOVASCULAR SYSTEM