Ventricular fibrillation (VF) is the the most important shockable cardiac arrest rhythm. It is invariably fatal unless advanced life support is rapidly instituted
The ECG changes associated with acute pulmonary embolism may be seen in any condition that causes acute pulmonary hypertension, including hypoxia causing pulmonary hypoxic vasoconstriction.
Inflammation of the pericardium secondary to infection, localised injury or systemic disorders, producing characteristic chest pain, dyspnoea and serial ECG changes.