top of page

QTc calculator

Example:

(standard paper speed 25 mm/sec)

n1 = 9

n2 = 24

Congenital/Hereditary (long QT syndrome/channelopathies)

Acquired causes of long QT

           Anorexia nervosa, Alcohol

           Bradycardia, Brain

           Coronary artery disease, Cardiomyopathy

           Drugs (see below), Diet (liquid protein)

           Electrolyte imbalance (hypokalemia, hypocalcemia, hypomagnesemia), Endocrine (hypothyroid)

Drugs causing QT interval prolongation

Anti-Arrhythmics e.g. procainamide, disopyramide, Amiodarone, Sotalol 

Anti-Anginals e.g. Ranolazine

Anti-Biotics e.g. Macrolides, Fluoroquinolones, Bactrim, azoles

Anti-psyChotics: 1st gen>2nd gen (chlorpromazine, haloperidol, risperidone)

Anti-Depressions: SSRIs, TCAs

Anti-Emetics: (5-HT3 antagonists) ondansetron, also droperidol

©2023 BY Piti Niyomsirivanich, MD. (Personal use)
Powered and secured by Wix

bottom of page