Heart Blocks

Question 1

AV blocks are caused by

Answer 1

A blockage of the AV node

Question 2

If the Rs are far from P

Answer 2

Then you have a first degree

Question 3

Longer, Longer, Longer, Drop!

Answer 3

Then you have a Wenckebach

Question 4

If some Ps don’t get through

Answer 4

Then you have a Mobitz 2

Question 5

If Rs and Ps don’t agree

Answer 5

Then you have a 3rd degree

Question 6

1st degree heart blocks are distinguished by

Answer 6

A PR interval of greater than 0.2 seconds

Question 7

A 2nd degree type I heart block or “Wenckebach” is distinguished by

Answer 7

A PR interval that gets longer until it drops a QRS complex

Question 8

A 2nd degree type II or Mobitz II is distinguished by

Answer 8

An irregular RR interval that is caused by occasional P waves that don’t generate QRS complexes

Question 9

A 3rd degree heart block is distinguished by

Answer 9

A constant RR interval that Occurs indecently of Constant P waves

Question 10

A high-grade 2nd degree heart block has

Answer 10

2 or more consecutive dropped beats

Question 11

An un-typable heart block is

Answer 11

A 2nd degree with a 2:1 conduction rate

Question 12

1st degree etiology

Answer 12

1. Sympatholytics (beta blockers, Ca2+Channel Blockers)
2. Parasympathomimetics
3. Increased Vagal Tone
4. Hyperkalemia-Hyperkalemia
5. Rheumatic Fever-Myocarditis
6. Aging (degeneration of conduction pathways)
7. Digitalis-Idiopathic
8. Inferior MI (Right Coronary Artery feeds inferior wall AND supplies AV node)

Question 13

2nd degree type I etiology

Answer 13

1. Sympatholytics (beta blockers, Ca2+Channel Blockers)
2. Parasympathomemetics-Increased Vagal Tone
3. Hyperkalemia
4. Hyperkalemia
5. Rheumatic Fever
6. Myocarditis
7. Aging (degeneration of conduction pathways)
8. Digitalis-Idiopathic
9. Inferior MI (Right Coronary Artery feeds inferior wall AND supplies AV node)

Question 14

Etiology of 2nd degree type II heart blocks

Answer 14

1. Sympatholytics (beta blockers, Ca2+Channel Blockers)
2. Parasympathomemetics-Increased Vagal Tone
3. Hyperkalemia
4. Hyperkalemia
5. Rheumatic Fever
6. Myocarditis
7. Aging (degeneration of conduction pathways)
8. Digitalis-Idiopathic
9. Inferior MI (Right Coronary Artery feeds inferior wall AND supplies AV node)

Question 15

3rd degree heart block etiology

Answer 15

4. Increased vagal tone: carotid sinus massage, pain, sleep,
   etc.
5. Surgery and trauma to the heart 5. Surgery and trauma to the heart
6. Cardiomyopathies
7. Myocarditis
8. Infective endocarditis
9. Electrolyte disorders
10. Congenital heart disease