QT prolongation

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: Prolonged QT; prolonged QT interval; QT interval prolongation

Overview

QT prolongation refers to a prolongation of the interval on the electrocardiogram during which time the ventricles depolarize and repolarize. QT prolongation is often caused by drugs, genetic abnormalities, and electrolyte disturbances. QT prolongation may predispose the patient to ventricular arrhythmias and sudden cardiac death. Long QT syndrome is one of the many causes of QT prolongation, and is an inherited channelopathy associated with sudden cardiac death.

Causes

Common Causes

Drugs
Genetic abnormalities that cause the Long QT Syndrome
Electrolyte disturbances such as hyperkalaemia, hypocalcaemia, hypoglycaemia, hypokalaemia, hypomagnesemia

Causes by Organ System

Cardiovascular	Ischaemic heart disease, Andersen cardiodysrhythmic periodic paralysis, Jervell and Lange-Nielsen syndrome, Romano-Ward syndrome, Timothy syndrome
Chemical / poisoning	Arsenicals
Dermatologic	No underlying causes
Drug Side Effect	Alimemazine, Almokalant, Amiodarone, Amitriptyline, Arsenic trioxide, Asenapine, Astemizole, Azimilide, Azithromycin, Bepridil, Bretylium, Budipine, Chloroquine, Cibenzoline, Cisapride, Citalopram, Clomipramine, Clozapine, Crizotinib, Desipramine, Diphenhydramine, Disopyramide, Dofetilide, Dolasetron, Doxepin, Dronedarone, Droperidol, Eribulin mesylate, Fluconazole, Grepafloxacin, Halofantrine, Haloperidol, Ibutilide, Imipramine, Indapamide, Ketanserin, Ketoconazole, Lidoflazine, Lubeluzole, Methadone, Methadyl acetate, Midodrine, Mizolastine, Moxifloxacin, Naratriptan, Nicardipine, Nilotinib, Ondansetron, Pasireotide, Pazopanib, Pentamidine, Pimozide, Piperaquine, Prenylamine, Probucol, Procainamide, Propoxyphene, Quinidine, Quinine, Ranolazine, Retigabine, Ritodrine, Ritonavir, Saquinavir, Sertindole, Sotalol, Sparfloxacin, Tedisamil, Telithromycin, Terfenadine, Terodiline, Tetrabenazine, Thioridazine, Vandetanib, Vemurafenib, Venlafaxine, Vernakalant, Voriconazole, Vorinostat, Ziprasidone, Zotepine, Zuclopenthixol
Ear Nose Throat	No underlying causes
Endocrine	Hypothyroidism
Environmental	Zero gravity
Gastroenterologic	No underlying causes
Genetic	Andersen cardiodysrhythmic periodic paralysis, Jervell and Lange-Nielsen syndrome, Myotonic dystrophy, Romano-Ward syndrome, Timothy syndrome
Hematologic	No underlying causes
Iatrogenic	No underlying causes
Infectious Disease	No underlying causes
Musculoskeletal / Ortho	Myotonic dystrophy, Andersen cardiodysrhythmic periodic paralysis, Timothy syndrome
Neurologic	No underlying causes
Nutritional / Metabolic	Acute starvation, Anorexia nervosa, Hyperkalaemia, Hypocalcaemia, Hypoglycaemia, Hypokalaemia, Hypomagnesemia
Obstetric/Gynecologic	No underlying causes
Oncologic	No underlying causes
Opthalmologic	No underlying causes
Overdose / Toxicity	Alimemazine, Almokalant, Amiodarone, Amitriptyline, Arsenic trioxide, Asenapine, Astemizole, Azimilide, Azithromycin, Bepridil, Bretylium, Budipine, Chloroquine, Cibenzoline, Cisapride, Citalopram, Clomipramine, Clozapine, Crizotinib, Desipramine, Diphenhydramine, Disopyramide, Dofetilide, Dolasetron, Doxepin, Dronedarone, Droperidol, Eribulin mesylate, Fluconazole, Grepafloxacin, Halofantrine, Haloperidol, Ibutilide, Imipramine, Indapamide, Ketanserin, Ketoconazole, Lidoflazine, Lubeluzole, Methadone, Methadyl acetate, Midodrine, Mizolastine, Moxifloxacin, Naratriptan, Nicardipine, Nilotinib, Ondansetron, Pasireotide, Pazopanib, Pentamidine, Pimozide, Piperaquine, Prenylamine, Probucol, Procainamide, Propoxyphene, Quinidine, Quinine, Ranolazine, Retigabine, Ritodrine, Ritonavir, Saquinavir, Sertindole, Sotalol, Sparfloxacin, Tedisamil, Telithromycin, Terfenadine, Terodiline, Tetrabenazine, Thioridazine, Vandetanib, Vemurafenib, Venlafaxine, Vernakalant, Voriconazole, Vorinostat, Ziprasidone, Zotepine, Zuclopenthixol
Psychiatric	Anorexia nervosa, Timothy syndrome
Pulmonary	No underlying causes
Renal / Electrolyte	No underlying causes
Rheum / Immune / Allergy	No underlying causes
Sexual	No underlying causes
Trauma	No underlying causes
Urologic	No underlying causes
Dental	No underlying causes
Miscellaneous	Hypothermia, Acute starvation

Causes in Alphabetical Order

References