Cardiac Review

Question 1

Syncytium

Answer 1

cells connected by gap junctions

Question 2

3 types of cardiac cells

Answer 2

1. atrial & ventricular muscle
2. excitatory cells (pacemaker; nodal)
3. conductive cells (cells unique ion channels & intercalated disc to move AP “fast”)

Question 3

ostium

Answer 3

coronary ostium begin at base of the aorta

Question 4

coronary perfusion time

Answer 4

diastolic BP is when coronary arteries perfuse.
↑DBP = more perfusion

in systole coronary vessels are compressed

Question 5

IABP & coronary blood flow

Answer 5

IABP will ↑ pressure at base of aorta = ↑ coronary artery perfusion