Aim and intended learning outcomes <p>The aim of this continuing education article is to develop the reader's understanding of the basic principles of patient-controlled analgesia, its clinical uses and the factors that influence its effectiveness. At the end of the article, you should be able to:</p> □ <p>Explain briefly how a PCA system works</p> □ <p>Describe the advantages and disadvantages of PCA</p> □ <p>Understand the importance of monitoring a patient using PCA</p> □ <p>Explain the importance of patient control.</p> <p>This article relates to UKCC Professional Development Category: Care enhancement.</p>