ST depression

An electrocardiographic abnormality characterized by displacement of the ST segment below the isoelectric baseline, typically ≥0.5-1 mm in two or more contiguous leads. Often reflecting myocardial ischemia, reciprocal changes in acute coronary syndrome, ventricular hypertrophy, bundle branch block, tachycardia, electrolyte imbalance (hypokalemia, hypomagnesemia, hypocalcemia, hypercalcemia), medications (digoxin), and physiological triggers (exercise or hyperventilation).