Clinical significance: Tall peaked T waves can occur with
high potassium (hyperkalemia), though they may also be a normal variant or reflect other conditions. This should be correlated urgently with a
serum potassium level, kidney function, medications, and a repeat clean 12-lead ECG. An ECG alone cannot rule out a heart attack: symptoms and serial ECG/troponins matter, as reflected in
acute STEMI assessment guidance.
If the person has chest pain, breathlessness, fainting, weakness, palpitations, or known kidney disease, they should be assessed urgently today.