title: A paradoxical response to arrhythmia therapy.
mesh_terms: D004562:Electrocardiography; D005424:Flecainide / Q000009:adverse effects*; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged; D013610:Tachycardia / Q000139:chemically induced* / Q000175:diagnosis; D014693:Ventricular Fibrillation / Q000139:chemically induced
chemical_list: D005424:Flecainide