CV Phys Review - Nordgren

Question 1

How do you compare cardiac stroke volume during particular intervals on an EKG?

Answer 1

Look at the R-R interval

variable lengths of time = passive filling

Longer passive filling period –> results in larger SV

Question 2

What way does the VR curve shift with volume loss? Volume increase?

Answer 2

• Loss of volume (hemorrhage, diuresis, severe dilation/loss of tone):
  
  • VR curve decreased (down, left)
• Increase volume:
  
  • VR curve increased (up, right)

Question 3

Which way does the Cardiac function curve shift with a change in contractility, HR, sympathetic activity, or heart failure?

Answer 3

• Loss of contractility, decreased sympathetic activity, heart failure, decreased HR:
  
  • Decreased CO
  • CO curve shifts downward
• Increased contractility, increased Sympathetic activity:
  
  • Increased CO
  • CO curve shifts upward

Question 4

How does Nitroglycerin affect the Cardiac function vs. VR curve?

Answer 4

• Nitro:
  
  • vasodilation
  • decreased venous return
    
    • VR curve shifts downward

Question 5

How does Furosemide affect the Cardiac function vs. VR curve?

Answer 5

• Diuretic
  
  • decrease volume
  • decreased VR
  • shift VR curve down

Question 6

How does Metoprolol affect the Cardiac function vs. VR curve?

Answer 6

• Beta blocker
  
  • decrease HR
  • decreased CO
  • shift Cardiac function curve downward