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Leads I, II and III are called the limb leads. The electrodes that form these signals are located on the limbs – one on each arm and one on the left leg. [40] [41] The limb leads form the points of what is known as Einthoven's triangle. [42] Lead I is the voltage between the (positive) left arm (LA) electrode and right arm (RA) electrode:
Tachycardia-dependent bundle branch block; A simple way to quickly differentiate between the two types is to note the deflection of the QRS complex in the V1 lead. A (V1) QRS segment deflected down indicates left bundle branch block, while a deflection up indicates right bundle branch block. In both types, the QRS is wide (> 0.12 seconds).
Left anterior fascicular block (LAFB) is an abnormal condition of the left ventricle of the heart, [1] [2] related to, but distinguished from, left bundle branch block (LBBB). It is caused by only the left anterior fascicle – one half of the left bundle branch being defective.
Bleeding may originate from the aorta, the anastomosis, an insufficiently sealed branch of the conduit, or from the sternum. Other causes include platelet abnormalities or their failure to clot —perhaps due to the bypass or to the rebound heparin effect, which occurs when the anti-coagulant heparin is administered at the beginning of surgery ...
The criteria to diagnose a right bundle branch block on the electrocardiogram: The heart rhythm must originate above the ventricles (i.e., sinoatrial node, atria or atrioventricular node) to activate the conduction system at the correct point. The QRS duration must be more than 100 ms (incomplete block) or more than 120 ms (complete block). [9]
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.
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A left posterior fascicular block (LPFB), also known as left posterior hemiblock (LPH), is a condition where the left posterior fascicle, which travels to the inferior and posterior portion of the left ventricle, [1] does not conduct the electrical impulses from the atrioventricular node.