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2. Left bundle branch block - Wikipedia

   en.wikipedia.org/wiki/Left_bundle_branch_block

   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 .

3. Bundle branch block - Wikipedia

   en.wikipedia.org/wiki/Bundle_branch_block

   The ECG will show a terminal R wave in lead V1 and a slurred S wave in lead I. Left bundle branch block widens the entire QRS, and in most cases shifts the heart's electrical axis to the left. The ECG will show a QS or rS complex in lead V1 and a monophasic R wave in lead I.

4. Heart block - Wikipedia

   en.wikipedia.org/wiki/Heart_block

   Infra-Hisian blocks may occur at the left or right bundle branches ("bundle branch block") or the fascicles of the left bundle branch ("fascicular block" or "Hemiblock"). SA and AV node blocks are each divided into three degrees, with second-degree blocks being divided into two types (written either "type I or II" or "type 1 or 2").

5. Sgarbossa's criteria - Wikipedia

   en.wikipedia.org/wiki/Sgarbossa's_criteria

   Sgarbossa's criteria are a set of electrocardiographic findings generally used to identify myocardial infarction (also called acute myocardial infarction or a "heart attack") in the presence of a left bundle branch block (LBBB) or a ventricular paced rhythm. [1] Myocardial infarction (MI) is often difficult to detect when LBBB is present on ECG ...

6. Wikipedia : Osmosis/Bundle Branch Block

   en.wikipedia.org/.../Bundle_Branch_Block

   And so the left ventricle contracts first . The signal then spreads from the purkinje fibers of the left ventricle over to the right ventricle, which contracts, but this happens after the left contracts. So with right bundle branch block, the right ventricle contracts late. If the block happened to be on the left side instead, a left bundle ...

7. Left axis deviation - Wikipedia

   en.wikipedia.org/wiki/Left_axis_deviation

   Normal variation causing LAD is an age-related physiologic 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 as congenital heart diseases such as atrial septal defect, endocardial cushion defects can also cause LAD on ECG.

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9. Cardiac conduction system - Wikipedia

   en.wikipedia.org/wiki/Cardiac_conduction_system

   The delay in the AV node forms much of the PR segment on the ECG, and part of atrial repolarization can be represented by the PR segment. The distal portion of the AV node is known as the bundle of His. [8] The bundle of His splits into two branches in the interventricular septum: the left bundle branch and the right bundle branch.