TY - JOUR T1 - Postcardioversion ST-segment changes JF - Emergency Medicine Journal JO - Emerg Med J SP - 854 LP - 866 DO - 10.1136/emermed-2021-211515 VL - 38 IS - 11 AU - Andre Briosa e Gala AU - John Paisey Y1 - 2021/11/01 UR - http://emj.bmj.com/content/38/11/854.abstract N2 - A 39-year-old man presented to the Emergency Department (ED) with a 10-hour history of palpitations but denied any chest pain, breathlessness or syncope. His medical history and family history were unremarkable. On admission, he was tachycardic with an irregularly irregular pulse at 180 beats/min. ECG showed atrial fibrillation with fast ventricular response (figure 1A). Bed-side transthoracic echocardiogram demonstrated a structurally normal heart. Chemical cardioversion was therefore attempted with intravenous flecainide. A postcardioversion 12-lead ECG was obtained (figure 1B).Figure 1 (A) 12-lead ECG showing a narrow complex tachycardia with no discernible P-waves and irregular R–R intervals in keeping with atrial fibrillation. … ER -