NICE Guideline 'Red Flags' to Predict Serious Outcome After Transient Loss of Consciousness

This study is designed to evaluate the accuracy of the National Institute for Health and Clinical Excellence (NICE) guideline 'red flags' to identify patients at high risk of short term serious outcome when presenting in the emergency department (ED) with Transient Loss of Consciousness (TLoC). Red flags were defined as ECG abnormality, history or physical signs of heart failure, TLoC during exercise, family history of sudden cardiac death at an age \< 40 years and/or an inherited cardiac condition, new or unexplained breathlessness, heart murmur, absence of prodromal symptoms in any patient aged \> 65 years.