Heart Block

Question 1

Heart Block: Define:

Answer 1

Abnormal heart rhythm where the heart beats too slowly (bradycardia)
Electrical signals that tell the heart to contract are partially or totally blocked between the upper chambers (atria) and lower chambers (ventricles)

Question 2

Types of Heart Block: (list, will define on next cards)

Answer 2

1. First Degree heart block
2. Second Degree heart block
   2a. Second Degree - Type 1/Mobitz 1/Wenckebach
   2b. Second Degree - Type 2/Mobitz 2
3. Third Degree heart block

Question 3

Define First Degree Heart Block:

Answer 3

First Degree Heart Block:

PR interval > 0.2 seconds

Question 4

Define Second Degree Heart Block: Type 1/Mobitz 1/Wenckebach

Answer 4

Second Degree Heart Block: Type 1:

Progressive prolongation of the PR interval until a dropped beat occurs

Question 5

Define Second Degree Heart Block: Type 2/Mobitz 2

Answer 5

Second Degree Heart Block: Type 2:

PR interval is constant, but the P wave is often not followed by a QRS complex

Question 6

Define Third Degree Heart Block:

Answer 6

Complete Heart Block = 3rd degree
No association between P waves and QRS complexes
If develops after MI, it is a right coronary artery lesion.

Question 7

Complete Heart Block Features:

Answer 7

Syncope
Heart Failure
Regular Bradycardia (30-50 bpm)
Wide pulse pressure
JVP: Cannon Waves 
Variable Intensity on S1