BIFASCICULAR
Technical documentation
Bifascicular Block (RBBB + LAFB)
Concomitant block of two of the three main ventricular conduction fascicles: complete right bundle branch block (RBBB) plus left anterior fascicular block (LAFB). ECG shows typical RBBB pattern in V1 (rSR') combined with marked left axis deviation (-45° to -90°). Only the left posterior fascicle remains functional.
Also known as: Bifascicular Block (RBBB + LAFB) · bloqueo bifascicular · BRD con hemibloqueo anterior · BRD + HBAI · bloqueo bifascicular anterior · bifascicular block · RBBB with LAFB
What parameters does the model use?
The following values are applied by the simulation engine to this entity. They govern activation kinematics in the 3D model and the real-time synthesis of the 12-lead electrocardiogram.
What parameters does the model use?
| Parameter | Model value |
|---|---|
| Mechanism | Bloqueo |
| Impulse origin | Sinoatrial node (SA node) |
| Modeled rate | 55–95 bpm (default 70) |
| Regularity | Regular |
| P wave | Sinus (upright in I, II, aVF) |
| PR interval | 120–200 ms (default 170) |
| QRS duration | 140 ms |
| QRS morphology | RBBB with left anterior fascicular block |
| AV conduction | 1:1 AV conduction |
| Severity | Clinically significant |
Which leads should be evaluated?
The catalog marks as primary diagnostic leads V1, V2, I, aVL, II, III, aVF. Complete RBBB in precordial leads (V1) combined with left anterior fascicular block (marked left axis).
In the simulator, these leads are highlighted on the 12-channel tracing and corresponding vectors are rendered on the 3D model, displaying electrical changes and anatomical origin simultaneously.
Frequently asked clinical questions
How is Bifascicular Block (RBBB + LAFB) identified on the 12-lead ECG?
Concomitant block of two of the three main ventricular conduction fascicles: complete right bundle branch block (RBBB) plus left anterior fascicular block (LAFB). ECG shows typical RBBB pattern in V1 (rSR') combined with marked left axis deviation (-45° to -90°). Only the left posterior fascicle remains functional. The characteristic diagnostic waveforms are generated in real time across the simulated 12-lead tracing.
Which leads are critical for diagnostic confirmation?
The primary diagnostic leads are V1, V2, I, aVL, II, III, aVF. Complete RBBB in precordial leads (V1) combined with left anterior fascicular block (marked left axis). In the simulator, these channels highlight the correlation with anatomical vectors.
What is the underlying electrophysiological or anatomical mechanism?
It originates from altered conduction in the SA_NODE, mediated by bloqueo.
How can this condition be explored in the 3D simulator?
MioAtlas offers direct deep-link reproducibility with preconfigured parameters, allowing full 3D cardiac rotation and lead vector inspection.
How do you open this configuration?
The simulator encodes its full state in the query string, providing a stable and reproducible URL:
https://mioatlas.com/simulador/en/?mode=conduction&arr=BIFASCICULAR&add=1
Related entities
Other entities in the same category within the catalog:
Sources and bibliographic references
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Surawicz B, Childers R, Deal BJ, et al. (2009). "AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: Part III: Intraventricular conduction disturbances". Circulation.
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Anderson RH, Yanni J, Boyett MR, Chandler NJ, Dobrzynski H (2009). "The anatomy of the cardiac conduction system". Clin Anat.
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Kligfield P, Gettes LS, Bailey JJ, et al. (2007). "Recommendations for the standardization and interpretation of the electrocardiogram: Part I: The electrocardiogram and its technology". Circulation.