In this article, we have discussed all the details about the heart block 1. Classification of heart block 2. Causes of heart block 3. Symptoms 4. signs 5. Investigations of heart block 6. and finally treatment of heart block

1. Defective production of the sino-artial impulse
or its conduction in the heart is called heart
block.

3. 1. sino-artial (or SA) block.
2. Atrio-ventricular (or AV) block:
A) Incomplete heart block
First degree heart block
second degree heart block
Mobitz type-1
Mobitz type-2
B) complete heart block
Third degree heart block

4.  3) Bundle branch block (BBB):
Right bundle branch block (RBBB)
Left bundle branch block (LBBB)
Bifascicular block: A combination of block
of any two of the following: the right bundle
branch, the left antero-superior division and
the left postero-inferior division.

5. A) congenital
B) Acquired
 Idiopathic fibrosis
 Myocardial infarction/ ischemia (especially
inferior MI).
 Inflammation
 Trauma e.g.; cardiac surgery
 Drugs (e.g.. Digioxin, beta-blocker)

6.  Dizziness
 Black out
 Sudden loss of consciousness

7.  Pulse: Bradycardia
 Blood pressure: High systolic, normal
diastolic and high pulse pressure.
 Heart sound: variable intensity of first heart
sound.
 Murmur: systolic flow murmur.

8.  A patient comes to you with sudden loss of
consciousness and fall. On examination pulse
is 30 betas/min. Blood pressure is
150/90mmofhg.
 What is your diagnosis?

9.  Complete heart block with stokes Adam’s
syndrome

10.  ECG
Finding
PR interval constant
RR interval constant
No relationship between P wave and QRS
complex (i.e. complex dissociation between P
and R).
Please read about cardiac tamponade ECG

11. 1) AV block complicating acute myocardial
infarction
If the patient remains well, no treatment is
required.
Only treatment of acute MI.

12. 2) Symptomatic complete heart block
complicating acute inferior MI.
Many responds to atropine (0.6mg IV, repeated
as necessary) or
If this fails, a temporary pacemaker.

13. 3) Complete heart block complicating acute
anterior MI
If the patient presents with asystole, IV
atropine (3mg) or IV isoprenaline (2mg in 500
ml 5% dextrose, infused at 10-60 ml/hour)
may help to maintain the circulation until a
temporary pacing electrode can be inserted.
Transcutaneous pacing can provide effective
temporary rhythm support

14. Learn about becks triad.