Diagnosis
- QTc >440 (male), >460 (female)
- >500 = real concern (may result in torsades)
Differential Diagnosis
- Pause Dependent (Aquired)
- Adrenergic Dependent
- Congenital
- Jarvel/Lange-Nielsen
- Romano-Ward synd
- Sporatic
- Mitral valve prolapse
- Acquired
- CVA (subarachnoid)
- Autonomic surg (catechol excess: neck dissection, carotid endarterect, truncal vagotomy)
Drug List
- Antiarrhythmics
- Amiodarone, disopyramide, dofetilide, flecainide, ibutilide, mexiletine, procainamide, quinidine, sotalol
- Antibiotics
- Macrolide
- Azithromycin, erythromycin, clarithromycin
- Fluoroquinolone
- Ciprofloxacin, gatifloxacin, gemifloxacin, levofloxacin, moxifloxacin, ofloxacin
- Other
- Pentamidine, telithromycin, trimethoprim-sulfamethoxazole
- Antidepressants
- Amitriptyline, citalopram, doxepin, fluoxetine, nortriptyline, paroxetine, sertraline, venlafaxine
- Antiemetics
- Dolasetron, droperidol, granisetron, ondansetron
- Antifungals
- Fluconazole, itraconazole, ketoconazole, voriconazole
- Antihypertensives
- Antineoplastics
- Lapatinib, nilotinib, sunitinib, tamoxifen
- Antimalarials
- Chloroquine, halofantrine
- Antipsychotics
- Chlorpromazine, clozapine, galantamine, haloperidol, lithium, paliperidone, pimozide, quetiapine, risperidone, thioridazine, ziprasidone
- Antivirals
- Amantadine, atazanavir, foscarnet
- Diuretics
- Immune suppressants
- Opiates
- Phosphodiesterase inhibitors
- Skeletal muscle relaxants
- Urinary antispasmodics
Treatment
Pause Dependent (precipitated by bradycard)
Adrenergic Dependent (precipited by tachycardia)
See Also
Source
External Links
Amal Mattu's Case of the Week (10/13/2014)