atrioventricular block (AV block )

Question 1

first degree AV block on ECG

Answer 1

rhythm=normal
PR interval= prolonged :>0.20
P wave=normal
QRS= normal

**every thing normal except prolonged PR interval

Question 2

second degree AV block on ECG mobitz 2

Answer 2

rhythm : irregular (2;1,3:1) ratio
PR interval normal
P wave: normal (more P waves than QRSs )
QRS: usually wide > 0.10

Question 3

second degree AV block on ECG mobitz 1

Answer 3

• increasingly prolonged rhythm(R-R interval) followed by dropped beat
  *irregular PR intervals
  *normal p wave ,normal QRS

Question 4

3rd degree AV block

Answer 4

regular rhythm
no PR interval
normal p wave
normal QRS
**p wave not related to QRS

Question 5

indication for permanent pacemaker in AV block

Answer 5

*3rd degree AV block
* symptomatic 2nd degree AV block
*asymptomatic 2nd degree mobitz 2
*exercise induced 2nd or 3rd degree AV block in absence of ischemia
*atrial fibrilation with bradycardia and pauses > 5 sec