AV Block

Question 1

what is 1st-degree block?

Answer 1

the impulse from the Sinus node is delayed in the AV node.

Question 2

In 1st-degree block the AV conduction is slower. What is the PR interval in secs?

Answer 2

It is longer than .20 secs

Question 3

Identify 1st degree block?

Answer 3

of P waves blocked : None
P-R interval : Long& Constant
QRS Complex : Normal Unless BBB present

Question 4

identify type 1 AV WENCKEBACH block

Answer 4

of P waves blocked : 1 at a time
P-R interval :Progressive increase
QRS Complex : NOrmal unless BBB present

Question 5

what is “group beating” in type 1 AV wenckebach block?

Answer 5

groups of beats separated by pauses

Question 6

Where is type 2 block occuring?

Answer 6

below the av node

Question 7

identify type 2 block

Answer 7

of P waves blocked : 1 at a time
P-R interval : Constant
QRS Complex : Wide

Question 8

identify advanced AV block

Answer 8

of P waves blocked : 2 or more
P-R interval : Normal
QRS Complex : normal in type 1 wide in type 2

Question 9

In Advanced av block the atrial rate must be….

Answer 9

less than 135

Question 10

a 3rd degree block can occur in which types of rhythms?

Answer 10

sinus and atrial rhythm

Question 11

identify 3r degree block

Answer 11

of P waves blocked : All
P-R interval : no relationship
QRS Complex : normal if junctional escape rhythm Wide if ventricular escape rhythm

Question 12

Ventricular rate needs to be less than how many bpm in a 3rd degree block?

Answer 12

45 bpm

Question 13

define bundle branch block

Answer 13

there is a delay in excitation of one ventricle due to failure of conduction through the blocked bundle