Complete Heart Block

Question 1

Which anatomical structure is affected in complete heart block?

Answer 1

Atrio-ventricular node

Question 2

What happens the the AV Node in heart block?

Answer 2

Fibrosis

Necrosis

Question 3

Why does heart block occur?

Answer 3

AV node cannot transmit electrical impulse from atria to ventricles
Ventricles develop their own pacemaker and contract independently and slower than atria

Question 4

Who is most likely to get complete heart block?

Answer 4

Elderly patient who may have had previous MI, be taking a beta-blocker or who is on rate lowering drugs

Question 5

What symptoms are associated with complete heart block that presents gradually?

Answer 5

Tiredness/ breathlessness with exercise

Question 6

What symptoms are associated with complete heart block that presents acutely?

Answer 6

Lightheadedness/ collapse with loss of consciousness

Question 7

What clinical signs would you see in complete heart block?

Answer 7

HR slow
BP low
Patient may suddenly lose consciousness- Cardiac syncope

Question 8

How is complete heart block treated?

Answer 8

Paramedics may give atropine

Temporary pacemaker

Question 9

How is secondary complete heart block prevented?

Answer 9

Permanent pacemaker