Bifascicular block is characterized by right bundle branch block with left anterior fascicular block, left bundle branch block, or right bundle branch block with left posterior fascicular block on electrocardiography. Complete heart block could be the cause of syncope that is otherwise unexplained if bifascicular block is seen on electrocardiography.[1] It is estimated that less than 50% of patients with bifascicular block have high-degree atrioventricular block, although the exact incidence is unknown.[2]
The European Society of Cardiology (ESC) suggests using electrophysiology studies to look into it (EPS). When pharmacologic stress or incremental atrial pacing induces high-degree atrioventricular block, a permanent pacemaker (PPM) is recommended. If EPS is negative, long-term rhythm monitoring with an implantable loop recorder (ILR) is advised.[3]
Most commonly, it refers to a combination of right bundle branch block (RBBB) and either left anterior fascicular block (LAFB) or left posterior fascicular block (LPFB), with the former being more common.[4]
^Shabbir, Muhammad Asim; Shaukat, Muhammad Hamza Saad; Ehtesham, Moiz; Murawski, Shannon; Singh, Sukhraj; Alimohammad, Rizwan (2022). "Bifascicular block in unexplained syncope is underrecognized and under-evaluated: A single-center audit of ESC guidelines adherence". PLOS ONE. 17 (2). PLOS: e0263727. Bibcode:2022PLoSO..1763727S. doi:10.1371/journal.pone.0263727. PMC 8884493. PMID 35226666.
^M, Brignole; C, Menozzi; A, Moya; R, Garcia-Civera; L, Mont; M, Alvarez; F, Errazquin; J, Beiras; N, Bottoni; P, Donateo (2001). "Mechanism of syncope in patients with bundle branch block and negative electrophysiological test". Circulation. 104 (17): 2045–2050. doi:10.1161/hc4201.097837. ISSN 1524-4539. PMID 11673344. S2CID 8442192. Retrieved December 30, 2023.
^M, Brignole; A, Moya; FJ, de Lange; JC, Deharo; PM, Elliott; A, Fanciulli; A, Fedorowski; R, Furlan; RA, Kenny; A, Martín; V, Probst; MJ, Reed; CP, Rice; R, Sutton; A, Ungar; JG, van Dijk (August 28, 2018). "2018 ESC Guidelines for the diagnosis and management of syncope". European Heart Journal. 39 (21). Eur Heart J: 1883–1948. doi:10.1093/eurheartj/ehy037. hdl:2262/89469. ISSN 1522-9645. PMID 29562304. Retrieved December 30, 2023.
^"Lesson VI — ECG Conduction Abnormalities". Archived from the original on 16 January 2009. Retrieved 2009-01-07.
and 24 Related for: Bifascicular block information
Bifascicularblock is characterized by right bundle branch block with left anterior fascicular block, left bundle branch block, or right bundle branch...
third meaning of trifascicular block refers to a specific finding on an electrocardiogram in which bifascicularblock is observed in a patient with a...
ECG. Bifascicularblock is a combination of right bundle branch block and either left anterior fascicular block or left posterior fascicular block. Conduction...
bundle branch blocks are; Bifascicularblock. This is a combination of right bundle branch block (RBBB) and either left anterior fascicular block (LAFB) or...
complexes in one of the above patterns or combinations of patterns (ie, bifascicularblock). In the context of atrial fibrillation, the Ashman phenomenon is...
whole heart's depolarization. Exceptions to this include complete heart block and certain ventricular artificial pacemaker rhythms, where the P waves...
Fascicular block may refer to: Left anterior fascicular block Left posterior fascicular blockBifascicularblock Trifascicular block This disambiguation...
exception of witnessed asystole (as in the case of bifascicularblock that progresses to complete heart block without an escape rhythm). During transcutaneous...
bundle branch block (RBBB) is a heart block in the right bundle branch of the electrical conduction system. During a right bundle branch block, the right...
Atrioventricular block (AV block) is a type of heart block that occurs when the electrical signal traveling from the atria, or the upper chambers of the...
Heart block (HB) is a disorder in the heart's rhythm due to a fault in the natural pacemaker. This is caused by an obstruction – a block – in the electrical...
Left bundle branch block (LBBB) is a conduction abnormality in the heart that can be seen on an electrocardiogram (ECG). In this condition, activation...
cardiovascular conditioning or due to asymptomatic type 1 atrioventricular block. Resting heart rates of less than 50 BPM are often normal during sleep in...
fascicular block (LAFB) is an abnormal condition of the left ventricle of the heart, related to, but distinguished from, left bundle branch block (LBBB)....
impulses from the SA node fail to reach the AV node because of SA or AV block. It is a protective mechanism for the heart, to compensate for the SA node...
Heart block: Sinoatrial AV 1° 2° 3° Intraventricular Bundle branch block Right Left Left anterior fascicle Left posterior fascicle Bifascicular Trifascicular...
Heart block: Sinoatrial AV 1° 2° 3° Intraventricular Bundle branch block Right Left Left anterior fascicle Left posterior fascicle Bifascicular Trifascicular...
change. Conduction defects such as left bundle branch block or left anterior fascicular block can cause LAD on the ECG. Pre-excitation syndrome as well...
A left posterior fascicular block (LPFB), also known as left posterior hemiblock (LPH), is a condition where the left posterior fascicle, which travels...
a cardiac arrest. This condition is sometimes confused with sinoatrial block, a condition in which the pacing impulse is generated, but fails to conduct...
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