![Dr. Smith's ECG Blog: Symptomatic Bradycardia. So-called Trifascicular Block. Occum's Razor and Hickum's dictum. Dr. Smith's ECG Blog: Symptomatic Bradycardia. So-called Trifascicular Block. Occum's Razor and Hickum's dictum.](https://4.bp.blogspot.com/-S4ukB8cLYhE/V5NzE0ost-I/AAAAAAAAKuA/7Xeg3WpJ41AYxd19g6tapvVV3JFcH3WfACLcB/s1600/4%2Byears%2Bprior%2Balso%2Bwith%2BRBBB%2BLAFB%2B1st%2Bdeg%2BAVB%2BPR%2B300.png)
Dr. Smith's ECG Blog: Symptomatic Bradycardia. So-called Trifascicular Block. Occum's Razor and Hickum's dictum.
![Left bundle branch block (LBBB): ECG criteria, causes, management – ECG learning | Bundle branch block, Conduction, Branch Left bundle branch block (LBBB): ECG criteria, causes, management – ECG learning | Bundle branch block, Conduction, Branch](https://i.pinimg.com/originals/df/6a/2c/df6a2cefbf8755d113fe3efd84611265.jpg)
Left bundle branch block (LBBB): ECG criteria, causes, management – ECG learning | Bundle branch block, Conduction, Branch
![Figure 3. This figure illustrates ECG patterns in LBBB and RBBB. As seen, LBBB is characterized by deep and broad S-waves… | Bundle branch block, Conduction, Branch Figure 3. This figure illustrates ECG patterns in LBBB and RBBB. As seen, LBBB is characterized by deep and broad S-waves… | Bundle branch block, Conduction, Branch](https://i.pinimg.com/originals/1d/ff/22/1dff229da1d0fbe9537e9501feb77500.jpg)
Figure 3. This figure illustrates ECG patterns in LBBB and RBBB. As seen, LBBB is characterized by deep and broad S-waves… | Bundle branch block, Conduction, Branch
![Bundle Branch Block and Fascicular Block - Cardiovascular Disorders - Merck Manuals Professional Edition Bundle Branch Block and Fascicular Block - Cardiovascular Disorders - Merck Manuals Professional Edition](https://www.merckmanuals.com/-/media/manual/professional/images/cvs_hearts_electrical_pathway.gif?mw=350&thn=0&sc_lang=en)
Bundle Branch Block and Fascicular Block - Cardiovascular Disorders - Merck Manuals Professional Edition
![Cardiologyemergencies (Chapter 1) - Pocket Guide to the American Board of Emergency Medicine In-Training Exam Cardiologyemergencies (Chapter 1) - Pocket Guide to the American Board of Emergency Medicine In-Training Exam](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:87377:20160511055659440-0361:69626tbl2_9-1.png?pub-status=live)