Atrioventricular Heart Blocks

Question 1

True or False in 1st degree AV Blocks impulses from the SA node to the ventricles are delayed, not BLOCKED.

Answer 1

TRUE

Question 2

How do you recognize a 1st degree AV block?

Answer 2

PR longer than normal .. greater than .20

Question 3

What are some causes of 1st degree AV block?

Answer 3

ischemia or injury to AV node, hyperkalemia, meds

Question 4

True or False in a 2nd degree AV block ever p wave is followed by a QRS.

Answer 4

FALSE: not every

Question 5

What type of rhythm does 2nd degree AV block have?

Answer 5

ventricular.. irreg

Question 6

What are the 2 types of 2nd degree AV blocks?

Answer 6

Wenckebach, Mobitz type 1; Mobitz type 2

Question 7

What are some causes of Wenckebach?

Answer 7

blockage of AV node, right coronary artery occlusion, disturbances in ANS.

Question 8

In second degree AV block : Mobitz type 2 where is the conduction delay?

Answer 8

below AV node, in bundle of his or bundle branches: much more serious; p-p reg, r-r irreg.

Question 9

What are some causes of second degree : mobitz type 2 AV block?

Answer 9

blockage in his-purkinje system, MI, meds

tx: permanent pacemaker.

Question 10

What is a third degree AV block?

Answer 10

Complete AV block, atria and ventricles cannot talk to each other; block at AV node, his or bundle branches; no p waves.

Question 11

What are causes of 3rd degree AV block?

Answer 11

MI

Question 12

What is tx for 3rd degree AV block?

Answer 12

Transcutaneous pacing