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A bundle branch block can be diagnosed when the duration of the QRS complex on the ECG exceeds 120 ms. A right bundle branch block typically causes prolongation of the last part of the QRS complex and may shift the heart's electrical axis slightly to the right.
So if the block happens on the right side, it’s referred to as a right bundle branch block. So with this type, the electrical signal starts at the SA node, contracts the atria, moves through the AV node, splits at the bundle of His, and then moves down the left bundle branch but is blocked on the right bundle branch.
Prolonged duration could indicate hyperkalemia [5] or intraventricular conduction delay such as bundle branch block. QRS amplitude: S amplitude in V1 + R amplitude in V5 < 3.5 millivolt (mV) [4] R+S in a precordial lead < 4.5 mV [4] R in V5 or V6 < 2.6 mV; Increased amplitude indicates cardiac hypertrophy: Ventricular activation time (VAT) < 50 ...
After the Bundle of His, the conduction system splits into the left bundle branch and the right bundle branch. Both branches conduct action potentials at about 1 m/s. However, the action potential starts traveling down the left bundle branch about 5 milliseconds before it starts traveling down the right bundle branch, as depicted by frame 13.
English: The characteristic wave patterns of a typical left bundle branch block as seen in an ECG. Wide QRS complexes are present and there's T wave inversion in lead V6 which is normal in this condition.
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English: The characteristic wave patterns of a typical right bundle branch block as seen in an ECG. Only the precordial lead V1 and V6 are shown. Wide QRS complexes are present and there's T wave inversion in lead V1 which is normal in this condition.
Left bundle branch block (LBBB) is a conduction abnormality in the heart that can be seen on an electrocardiogram (ECG). [1] In this condition, activation of the left ventricle of the heart is delayed, which causes the left ventricle to contract later than the right ventricle .