ECG immediately on admission, repeated every 15 min if chest pain persists (if acute coronary syndrome suspected but ECG is normal, include modified leads (lateral and right sided leads) as left circumflex coronary territory or right ventricular ischaemia may not appear with standard lead positions)

Chest X-ray

Biomarkers

Point-of-care echocardiography (Table 7.7)

Full blood count

Blood glucose

Plasma sodium, potassium and creatinine