title: EKG of the month.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000175:diagnosis; D006329:Heart Conduction System / Q000502:physiology; D006801:Humans; D008875:Middle Aged; D011802:Quinidine / Q000009:adverse effects*
chemical_list: D011802:Quinidine