CH 8 Heart Block Dysrhythmias

Question 1

How to Identify a 1st Degree AV Block

Answer 1

PR interval is constant and measures greater than 0.20 sec

Question 2

1st degree AV Block

Answer 2

A delay in electrical conduction from the SA Node to the AV node.

Question 3

Different name for a Type 1 2nd Degree AV Block

Answer 3

Mobitz Type I
Wenckebach

Question 4

How to Identify a Type 1 2nd Degree AV Block / Mobitz Type I / Wenckebach

Answer 4

“Lengthen Lengthen Lengthen drop, that is a Wenckebach”
cyclical prolonging PR interval until the QRS is blocked. Cycle resets and begins again.

Question 5

When will a patient begin to show signs of decreased cardiac output when a Wenckebach is present?

Answer 5

When it reaches a rate of 40bpm or lower

Question 6

Wenckebach/ Mobitz I / 2nd Degree AV Block Type I is usually due to?

Answer 6

inflammation around the AV node
-often a temporary condition that will resolve itself and return to a normal heart rhythm

Question 7

Another name for 2nd Degree AV Block Type II

Answer 7

Mobitz II or classical heart block

Question 8

How to identify a Mobitz II

Answer 8

QRS complexes are missing, but wherever a P is with the QRS complex, the PR interval always measures the same

Question 9

Which 2nd degree AV block can quickly lead to a 3rd degree heart block?
Mobitz I or Mobitz II

Answer 9

Mobitz II

Question 10

another name for 3rd degree heart block

Answer 10

Complete Heart block

Question 11

what does CHB stand for

Answer 11

Complete Heart Block

Question 12

How to identify a CHB

Answer 12

P-P and R-R intervals are regular, but the atria and ventricles are firing at different rates
-Only heart block in which the P waves can be buried inside a QRS complex or T wave