RT Journal Article SR Electronic T1 Lessons of the month 5: Cardiac tamponade after an acute myocardial infarction: the clinical diagnosis JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 227 OP 228 DO 10.7861/clinmed.2019-0248 VO 20 IS 2 A1 Nida Ahmed A1 Sabahat Ahmed A1 Hazem Lashin YR 2020 UL http://www.rcpjournals.org/content/20/2/227.abstract AB We present the case of a late presenting ST-elevation myocardial infarction with a coronary dissection. After primary percutaneous coronary intervention, the patient went on to develop pericardial effusion with tamponade. Despite only a small volume of fluid, we demonstrate how it can have significant clinical consequences in the diseased heart. We also highlight the value of being able to carry out bedside echocardiography in the acutely unwell post-myocardial infarction patient.