Cardiology Ch 5 Flashcards


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created 1 year ago by nick_madon9
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1

Heart block

When there is a partial or complete interruption in the cardiac electrical conduction system

- Varies depending on the relationship between the P wave and the QRS complex

2

Lethal dysrhythmia

The location of the block and the resulting patients symptoms

3

First degree heart block

Caused by a delay in the conduction of an electrical impulse between the atria and the bundle of his.

- Occurs when there is a partial interruption or slowing in the conduction of an electrical impulse through the AV node

4

What can first degree heart blocks be caused by?

MI, and medication such as beta blockers

5

Second degree heart block type 1

Characterized by progressive lengthening of the PR interval until the loss of s QRS complex occurs.

- Interruption becomes longer with each impulse delaying the depolarization of the ventricles

6

What can cause a second degree type 1 heart block?

MI, infection, or drug toxicity

7

Second degree heart block type 2

Occurs when there is a intermittent interruption in the electrical conduction system near or below the AV node

- can occur in any rhythm that has P waves followed by a QRS complex

8

What can a second degree type 2 heart block be caused by?

MI, heart disease, or drug toxicity

9

Third degree heart block

Occurs when the electrical impulse is completely blocked between the atria and the ventricles.

- Atria and ventricles function independently as if they were two separate hearts

10

What causes 3rd degree heart blocks?

MI or severe heart disease

11

Bundle branch block

Interruption in the cardiac electrical conduction system of either the right or left bundle branch.

- Not a true block

12

What can cause a bundle branch block?

Heart disease or MI