RT Book, Section A1 Huis in ‘t Veld, Maite A. A1 Mattu, Amal A1 Thurman, R. Jason A2 Knoop, Kevin J. A2 Stack, Lawrence B. A2 Storrow, Alan B. A2 Thurman, R. Jason SR Print(0) ID 1181052814 T1 Pericardial Effusion T2 The Atlas of Emergency Medicine, 5e YR 2021 FD 2021 PB McGraw-Hill PP New York, NY SN 9781260134940 LK accessmedicine.mhmedical.com/content.aspx?aid=1181052814 RD 2024/10/06 AB Sinus tachycardiaLow voltage of QRS complex (QRS averaging < 5 mm height in limb leads or < 10 mm height in precordial leads)Electrical alternans (beat-to-beat change in electrical axis and/or amplitude of the QRS complex)