P waves should be positive in the inferior leads because right atrial activation starts at the sinus node and propagates to the AV node
in an inferior direction.
Normally cardiac conduction originates from the sinus node and travels to the AV node
, where conduction is slowed, and then proceeds to the His-Purkinje system, and finally to the rest of the ventricular myocardium.
However, it also occurs as a result of drugs that slow AV node
conduction (beta blockers or calcium channel blockers) or in persons with intrinsic AV nodal disease, myocarditis, acute inferior myocardial infarction or ischemia, and after cardiac surgery (Sauer, 2013).
The only way for electricity from the upper rooms of the heart (the atria) to get down to the lower rooms of the heart (the ventricles) is through the AV node
and the normal conduction system.
reentrant tachycardia occurs when an electrical short-circuit happens in the centre of the heart.
(2) As in mammals, birds have a cardiac conduction system that consists of a sinoatrial (SA) node, an AV node
, and Purkinje fibers.
Complete heart block is the most common postoperative arrhythmia requiring longterm therapy, and most commonly arises after surgery near the AV node
If you had successful ablation of the AV node
, then the atria (top portion of your heart) should not be conducting to the ventricles (bottom chambers), whether you have atrial fibrillation or atrial flutter.
AEx (1 g/l) depressed impulse conduction through the AV node
There were no cases of permanent AV block in 151 ablated subjects with AVNRT or AVRT, despite frequent ablations near the AV node
, according to the manufacturer.
Once these specialized conduction tissues of the SA node send out the impulse, it only takes 0.08 seconds for the impulse to travel through the atria making them contract and then the impulse goes to the next major electrical point of the heart called the atrioventricular node (AV node
Harrington suffered from a defect in his AV node
, the most common form of SVT.