Skip to content

QT interval

SHARE VIA:

QT interval varies with heart rate.

Bazett’s formula is used to correct the QT for HR:

QTc = QT measured / (√R–R interval)

 

Normal QTc:

Infants less than 6 months is < 0.49 seconds

Older than 6 months < 0.44 seconds

 

QTc is prolonged in:

  • Hypocalcaemia
  • Myocarditis
  • Long QT syndromes e.g. Romano‐Ward
  • Head injury
  • Drugs: see table

 

drugs prolonging QT interval

 

QTc is short in:

  • Hypercalcaemia
  • Digitalis effect

About the authors

KEEP READING

High flow therapy – when and how?

Chest compressions in traumatic cardiac arrest

Searching for sepsis

The missing link? Children and transmission of SARS-CoV-2

Don’t Forget the Brain Busters – Round 2

An evidence summary of Paediatric COVID-19 literature

Urticaria

The fidget spinner craze

Parenteral Nutrition

DFTB WORLD

EXPLORE BY TOPIC

We use cookies to give you the best online experience and enable us to deliver the DFTB content you want to see. For more information, read our full privacy policy here.
[cmplz-manage-consent]