Electrocardiographic criteria

· Severe ST segment depression (>3 mm)

· ST segment elevation > 1 mm in non-Q wave lead

· Frequent ventricular extrasystoles (unless the test is to assessment ventricular arrhythmia)

· Onset of ventricular tachycardia

· New atrial fibrillation or supraventricular tachycardia

· Development of new bundle branch block (if the test is primarily to detect underlying coronary disease)

· New second or third degree heart block

· Cardiac arrest

Symptoms and signs

· Severe fatigue

· Severe chest pain, dyspnoea or dizziness

· Fall in systolic blood pressure (>20 mmHg)

· Rise in blood pressure (systolic > 300 mmHg, diastolic > 130 mmHg)

· Ataxia