Monitoring or recording an electrocardiogram (ECG) is one of the most common investigations carried out in clinical practice or as part of a health review. All healthcare practitioners should have a basic understanding of electrocardiography technique and the interpretation of an ECG trace. This module aims to help you recognise sinus rhythm on an ECG to ensure you understand this essential clinical skill and practise competently. Learning aims and intended outcomes How a normal heart works and the principle of cardiac depolarisation What sinus rhythm is and how it appears on an ECG trace How to recognise the components of the ECG complex. The purpose of a 12-lead ECG and its clinical benefits Disclaimer Please note that information provided by RCNi Learning is not sufficient to ensure competence in the skill. Assessment of competence should take place in line with local practice. Practice should always align with local protocols and procedures, latest guidelines and any regulatory code. All modules should currently be viewed together with available national and local Covid-19 guidelines. For advice, go to www.rcn.org.uk/covid-19