Cardiology Ch 4 Flashcards


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created 1 year ago by nick_madon9
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1

Atrioventricular node

Acts as a relay station between the atria and the ventricles, delaying electrical impulses so as to allow the atria to completely empty and refill the ventricles with blood.

2

Inherent heart rate

AV junctional rate is 40 to 60 electrical impulses per minute

3

Junctional dysrhythmia

The electrical impulse that travels through the normal conduction pathway from the AV junction through the bundle of his and bundle branches, to the Purkinje fibers, ending in the ventricular muscle

4

Inverted P wave

Upside down due to retrograde depolarization

- Shortened PR interval of less than 0.12 seconds

5

Buried P wave

The force of the atrial depolarization is less than the force of the ventricular depolarization and therefore the P wave is hidden by the QRS complex

6

Retrograde P wave

Electrical impulse originates in the lower part of the AV junctional area, the distance the impulse must travel to the atria is greater than the distance to the ventricles.

- The atria depolarize slightly later than the ventricles

7

Junctional bradycardia

Dysrhythmia that occurs when all the electrical impulses originate from a single site within the AV junctional area, at a rate less than 40 impulses per minute.

- Caused by heart disease or medications

8

Accelerated junctional rhythm

Occurs when all the electrical impulses originate from a single site within the AV junctional area, at a rate between 61 and 100 impulses per minute.

9

Junctional tachycardia

Rate between 101-150 impulses per minute

10

Premature junctional complex

Individual complex that originates from a single site in the AV junctional area and occurs earlier than the next expected complex of the underling rhythm.

- Common and can occur in any rhythm

11

Wandering atrial pacemaker

Originates from at least three different sites above the bundle of his.

- SA node, any pacemaker site in the atria, the AV junction, or a combination of these area.

12

Atrioventricular junctional area

Portion of the hearts conduction system that works with the AV node to relay the release of electrical stimuli to the ventricles

- May function as a secondary pacemaker of the heart