TY - CHAP M1 - Book, Section TI - Trifascicular Block 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 PY - 2021 T2 - The Atlas of Emergency Medicine, 5e AB - RBBB with left anterior fascicular block and/or left posterior fascicular block and first- or second-degree AV block.Somewhat of a misnomer, this is not a true blocking of three fascicles; rather, two fascicles are blocked coupled with PR interval prolongation.LBBB plus first-degree AV block is sometimes referred to as trifascicular block as well, but again, only two fascicles are truly blocked in this scenario. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/04/19 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1181052478 ER -