QT prolongation

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

Synonyms and keywords: Prolonged QT

Overview

QT prolongation is often caused by drugs, genetic abnormalities, and electrolyte disturbances.

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

Acute starvation Alimemazine Almokalant Amiodarone Amitriptyline Andersen cardiodysrhythmic periodic paralysis Anorexia nervosa Arsenic trioxide Arsenicals 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 Hyperkalaemia Hypocalcaemia Hypoglycaemia Hypokalaemia Hypomagnesemia Hypothermia Hypothyroidism Ibutilide Imipramine Indapamide Ischaemic heart disease Jervell and Lange-Nielsen syndrome Ketanserin Ketoconazole

Lidoflazine Lubeluzole Methadone Methadyl acetate Midodrine Mizolastine Moxifloxacin Myotonic dystrophy Naratriptan Nicardipine Nilotinib Ondansetron Pasireotide Pazopanib Pentamidine Pimozide Piperaquine Prenylamine Probucol Procainamide Propoxyphene Quinidine Quinine Ranolazine Retigabine Ritodrine Ritonavir Romano-Ward syndrome Saquinavir Sertindole Sotalol Sparfloxacin Tedisamil Telithromycin Terfenadine Terodiline Tetrabenazine Thioridazine Timothy syndrome Vandetanib Vemurafenib Venlafaxine Vernakalant Voriconazole Vorinostat Zero gravity Ziprasidone Zotepine Zuclopenthixol