Left Posterior Fascicular Block (Left Anterior Hemiblock)
Definition
Intraventricular Conduction Delay (IVCD) : abnormality in intraventricular signal conduction which results in a change in the shape or duration of the QRS complex
Classification of Intraventricular Conduction Delays (IVCD)
General Comments : refers to abnormalities in intraventricular signal conduction which result in a change in the shape or duration of the QRS complexLeft Bundle Branch Block (LBBB) (see Left Bundle Branch Block , [[Left Bundle Branch Block]])Right Bundle Branch Block (RBBB) (see Right Bundle Branch Block , [[Right Bundle Branch Block]])Left Anterior Fascicular Block (Left Anterior Hemiblock) (see Left Posterior Fascicular Block , [[Left Anterior Fascicular Block]])Left Posterior Fascicular Block (Left Posterior Hemiblock)
Epidemiology
Etiology
Physiology
Blood Supply to Cardiac Conduction System
Blood Supply to the Sinoatrial (SA) Node
Right Coronary Artery : 60% of patientsLeft Circumflex Artery : 40% of patients
Blood Supply to the Atrioventricular (AV) Node
Right Coronary Artery : 90% of patientsLeft Circumflex Artery : 10% of patients
Blood Supply to the His Bundle
Right Coronary Artery : main blood supplySeptal Perforators of the Left Anterior Descending Coronary Artery : minor contribution
Main/Proximal Left Bundle Branch
Left Anterior Descending Artery : main blood supplyRight Coronary Artery : collateral flowLeft Circumflex Artery : collateral flow
Left Anterior Fascicle
Septal Perforators of the Left Anterior Descending Coronary Artery : main blood supplyAV Nodal Artery : 50% of patientsLeft Posterior Fascicle Proximal Left Posterior Fascicle
AV Nodal Artery: main blood supply
Septal Perforators of the Left Anterior Descending Coronary Artery: in some cases
Distal Left Posterior Fascicle
Anterior and Posterior Septal Perforating Arteries (Dual Blood Supply)
Right Bundle Branch
Septal Perforators of the Left Anterior Descending Artery : main blood supplyRight Coronary Artery : some collateral flow (depending on dominance of the system)Left Circumflex Artery : some collateral flow (depending on dominance of the system)
Diagnosis
Clinical Manifestations
Cardiovascular Manifestations
Other Manifestations
Treatment
References
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