Left posterior fascicular block
Encyclopedia
A left posterior fascicular block is a condition where the left posterior fascicle, i.e. the backside part of the left cardiac bundle, does not conduct the electrical impulses from the atrioventricular node
. The electricity then has to go through the other fascicle, and thus is a frontal right axis deviation seen on the ECG.
The deviation should be greater than +120 degrees and it is not a pathognomonic
sign; there are other conditions that can give the same picture.
Atrioventricular node
The atrioventricular node is a part of the electrical control system of the heart that coordinates heart rate. It electrically connects atrial and ventricular chambers...
. The electricity then has to go through the other fascicle, and thus is a frontal right axis deviation seen on the ECG.
The deviation should be greater than +120 degrees and it is not a pathognomonic
Pathognomonic
Pathognomonic is a term, often used in medicine, that means characteristic for a particular disease. A pathognomonic sign is a particular sign whose presence means that a particular disease is present beyond any doubt...
sign; there are other conditions that can give the same picture.