Update of the Guidelines of the Spanish Society of Cardiology for Unstable Angina/Without ST-Segment Elevation Myocardial Infarction

The Clinical Practice Guidelines must be an up-todate reference document, and relevant clinical changes must be made periodically to the original document. Since the publication of the last edition of the Guide in 1999,1 various studies have been published that report new data regarding management of the acute coronary syndrome (ACS) that are being incorporated into clinical practice and therefore must not be ignored. The Ischemic Cardiopathy and Coronary Unit Section has created a document on Chest Pain Units2 that includes management of ACS in the emergency room that was not included in the original version of the Guide. There is not a new edition of the Guide, but rather an Addendum to the Guide with regard to 3 concrete S P E C I A L A RT I C L E S