ECG Reference
Bundle Branch and Fascicular Blocks on ECG
12 terms — criteria, diagrams, and real ECG strips
Right bundle branch blockRight bundle branch block (RBBB) is a slowing or interruption of impulse conduction through the right bundle branch, causing the right ventricle to…
Incomplete right bundle branch blockIncomplete right bundle branch block (incomplete RBBB) is a slowing of conduction through the right bundle branch that does not meet the criteria for a complete block.
Left bundle branch blockLeft bundle branch block (LBBB) is impaired conduction through the left bundle branch, in which the left ventricle is activated with a delay via…
Incomplete left bundle branch blockIncomplete left bundle branch block (incomplete LBBB) is an electrocardiographic category defined by delayed or partially impaired conduction through the left bundle branch…
Left anterior fascicular blockLeft anterior fascicular block (LAFB) is impaired conduction through the anterosuperior division of the left bundle branch, in which activation…
Left posterior fascicular blockLeft posterior fascicular block (LPFB) is impaired conduction through the posteroinferior division of the left bundle branch.
Bifascicular blockBifascicular block is the combined involvement of two of the three fascicles of the ventricular conduction system.
Trifascicular blockTrifascicular block is a historical and ambiguous term used to describe the combination of a bifascicular block (RBBB plus block of one of the left bundle fascicles, or isolated…
Nonspecific intraventricular conduction delayNonspecific intraventricular conduction delay (NSIVCD) is a prolongation of…
Alternating bundle branch blockAlternating bundle branch block is a condition in which complete right and left bundle branch blocks alternate on the ECG in the same…
Masquerading bundle branch blockMasquerading bundle branch block (MBBB) is an ECG pattern in which the precordial leads appear to show a right bundle branch block (RBBB), while…
Rate-dependent bundle branch blockRate-related bundle branch block is the appearance of a right or left bundle branch block when a specific heart rate is reached…
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