ST segment


Share on facebook
Share on twitter
Share on linkedin
Share on whatsapp

The normal ST is isoelectric. Elevation or depression is judged in relation to the PR segment.

Some changes may be normal:

  • Limb lead depression or elevation up to 1mm and in left precordial leads of up to 2mm.
  • J‐depression: the J point (junction between the QRS and ST segment) is depressed without sustained ST depression i.e. depression with a gentle upward slope.
  • Early repolarisation in adolescents: the ST segment is elevated and concave in leads with an upright T wave.

Others are pathological, either:

  • a downward slope of the ST followed by a biphasic inverted T or
  • a sustained horizontal ST segment depression 0.08 sec or longer

ST segment

Pathological ST segment changes are commonly associated with T wave changes and occur in:

  • Pericarditis
  • Myocardial ischaemia or infarction
  • Severe ventricular hypertrophy (ventricular strain pattern)
  • Digitalis effect

About the authors


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

Global Developmental Delay


Foot x-rays

The fidget spinner craze – the good, the bad and the ugly

Parenteral Nutrition