EKG book- blocks

Question 1

prolonged delay in conduction at AV node or Bundle of His

Answer 1

First degree AV block

Question 2

Diagnosis of first degree AV block requires PR interval 0f greater than….

Answer 2

0.2 seconds

Question 3

does every atrial impulse make it through the AV node to the ventricles in first degree AV block?

Answer 3

YES

Question 4

Is every QRS complex preceded by a single P wave in first degree AV block?

Answer 4

YES

Question 5

There is a slight risk of what in patients with first degree AV block

Answer 5

A fib

Question 6

Not every atrial impulse is able to pass through AV node into ventricles
**because some P waves fail to conduct through the ventricles, the ratio of P waves to QRS completes is greater than 1:1

Answer 6

Second degree AV block

Question 7

More P waves than QRS complexes in…

Answer 7

Second degree AV block

Question 8

Almost always due to block in the AV node
*each successive atrial impulse encounters a longer and longer delay in the AV node until one impulse (usually 3rd or 4th) fails to make it through

Answer 8

Wenckebach Block (Mobitz I)