TRIFASCICULAR
Technical documentation
Trifascicular Block
Disease involving all three fascicles: bifascicular block (typically RBBB + LAFB or LPFB) combined with first-degree AV block (prolonged PR, reflecting delay in the remaining fascicle or AV node). High risk of progression to complete infrahisian block.
Also known as: Trifascicular Block · bloqueo trifascicular · bloqueo trifascicular incompleto · trifascicular block
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 | 45–85 bpm (default 62) |
| Regularity | Regular |
| P wave | Sinus (upright in I, II, aVF) |
| PR interval | 220–380 ms (default 270) |
| QRS duration | 145 ms |
| QRS morphology | RBBB with left anterior fascicular block |
| AV conduction | 1:1 AV conduction |
| Severity | Life-threatening |
Which leads should be evaluated?
The catalog marks as primary diagnostic leads V1, I, aVL, II, III, aVF. Bifascicular block (RBBB + LAFB) accompanied by prolonged PR interval (first-degree AV block).
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 Trifascicular Block identified on the 12-lead ECG?
Disease involving all three fascicles: bifascicular block (typically RBBB + LAFB or LPFB) combined with first-degree AV block (prolonged PR, reflecting delay in the remaining fascicle or AV node). High risk of progression to complete infrahisian block. 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, I, aVL, II, III, aVF. Bifascicular block (RBBB + LAFB) accompanied by prolonged PR interval (first-degree AV block). 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=TRIFASCICULAR
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.