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Recognition of Drug-Induced Prolonged QT

This is an educational poster aimed at helping the physician to recognize drug-induced prolonged QT. In order to do this, normal ECG and QT intervals are reviewed and compared with prolonged QT intervals. This poster also takes a look at the risk factors related to this condition and the tools and strategies that may be followed to facilitate the recognition of induced QT prolongation in ECGs.

The poster can be downloaded at the end of the page

Measure QT and RR intervals

QT and RR Interval Graphs

Correct for Heart Rate

Heart Rate Correction

Check QTc versus Normal Limits

QTc vs normal limits

Risk Factors


Genetics Risk factor


Electrolytes risk factor


Brady-Arrhythmia Risk Factor

Poor Liver or Heart Function

Poor liver or heart function risk factor


Drug Risk Factor

Tools and Strategies for Measuring Difficult ECGs



Flat T-wave in Limb Leads - Use All Leads

Flat T-wave in Limb Leads

Bi-phasic T-wave - Include Terminal Portion

Bi-phasic T-wave

Calculating QTc in the Presence of Varying Heart Rate

Calculating QTc in the Presence of Varying Heart Rate

TP Fusion - Measuring QT in Presence of High Heart Rate

TP Fusion

Do Not Include Normal U-waves

Normal U-waves

TP Fusion - Long PR Interval

TP Fusion - Long PR Interval

Include U-wave When Abnormal or Unable to Separate from T-wave

Abnormall U wave

T-wave Before and After Drug Effect

T-wave before and after drug effect
  • Circulatory
  • ECG
  • Cardiac care
  • Clinical