Abnormalities, Drug-Induced; Analgesics/adverse effects; Anti-Arrhythmia Agents/adverse effects; Anti-Bacterial Agents/adverse effects; Antidepressive Agents/adverse effects; Antihypertensive Agents/adverse effects; Antimetabolites/adverse effects; Antineoplastic Agents/adverse effects; Arrhythmias, Cardiac/chemically induced; Arteritis/chemically induced; Atropa belladonna/adverse effects; Cardiovascular Diseases/chemically induced; Central Nervous System Stimulants/adverse effects; Clofibrate/adverse effects; Coronary Disease/chemically induced; Digitalis Glycosides/adverse effects; Drug Therapy/adverse effects; Emetine/adverse effects; Female; Heart Defects, Congenital/chemically induced; Heart Diseases/chemically induced; Humans; Hypertension/chemically induced; Hypoglycemic Agents/adverse effects; Iatrogenic Disease; Phenothiazines/adverse effects; Plants, Medicinal; Plants, Toxic; Pregnancy; Pregnancy Complications, Cardiovascular/chemically induced; Procainamide/adverse effects; Quinolines/adverse effects; Sulfonamides/adverse effects; Sympatholytics/adverse effects; Sympathomimetics/adverse effects; Tranquilizing Agents/adverse effects