Chapter 8 Heart blocks

What is the cause of a heart block dysrhythmia? 

• The ectopic focus originates above the ventricles
• The electrical current has difficulty traveling down the normal conduction pathway
• The rhythm originates at the AV junctional tissue, producing retrograde depolarization
• An ectopic beat that originates in the right or left atria

An ectopic beat that originates in the right or left atria

• The electrical current is delayed or blocked along normal conduction pathways below the AV junction
• The electrical current is delayed or blocked along normal conduction pathways in the ventricles
• The electrical current is delayed or blocked along normal conduction pathways at or above the AV junction
• The electrical current is delayed or blocked along normal conduction pathways above the SA node

Choose the 3rd degree heart block:

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WHICH STRIP IS CONSTANT WITH SINUS RHYTHM WITH FIRST DEGREE AV BLOCK?

• A

• B

• C

• D

Which strip in Figure 17 is consistent with Mobitz I second-degree AV block (Wenckebach)?

• A

• B

• C

• D

Which strip in Figure 17 is consistent with Mobitz II second-degree AV block?

• A

• B

• C

• D

Which strip in Figure 17 is consistent with third-degree AV block?

• A

• B

• C

• D

AV dissociation is a hallmark of

• first-degree AV block.

• Mobitz I second-degree AV block (Wenckebach).

• Mobitz II second-degree AV block.

• third-degree AV block.

The rhythm in Figure 18 is

• Wenckebach.

• Mobitz II second-degree AV block.

• third-degree AV block.

• junctional bradycardia.

In Figure 18, which of the heart's pacemakers is controlling the ventricle?

• sinus node

• atrium

• AV node

• ventricle