Cardiac Equations

Question 1

MAP=?

Answer 1

CO*TPR

Question 2

CO?

Answer 2

SV*HR

Question 3

CO? (fick’s principle)

Answer 3

CO = Rate of O2 Consumption/ (arterial O2 content − venous O2 content)

Question 4

Pulse pressure is proportional to?

Answer 4

SV

Question 5

Pulse pressure=?

Answer 5

Systolic-diastolic

Question 6

SV=?

Answer 6

EDV-ESV

Question 7

In Early Exercise=> CO is maintained by?

Answer 7

HR and SV

Question 8

In Late Exercise=> CO is maintained by?

Answer 8

HR only

Question 9

With increased HR, what happens to CO?

Answer 9

CO decreases=>decreased filling time

Question 10

pulse pressure increases in places where?

Answer 10

heart works too much+aortic regurg

Question 11

pulse pressure decreases in places where?

Answer 11

heart doesn’t work+aortic Stenosis

Question 12

SV is affected by?

Answer 12

CAP
Contractility=increases SV
Preload=increases SV
Afterload=>decreases SV

Question 13

What happens to contractility with decreased extracellular Na+?

Answer 13

Increased contractility

Question 14

What happens to contractility with acidosis?

Answer 14

Decreased contracility

Question 15

What increases O2 demand?

Answer 15

Increased Contractility
Increased Afterload
Increased HR
Increased Diamter/Wall tension

Question 16

Why does a the heart hypertrophy?

Answer 16

to decrease wall tension

Question 17

In diastolic HF,

Answer 17

EF is normal

Question 18

Flow (Q) and Resistance Equations

Answer 18

Q=∆P/R

FPR

Question 19

Surface Area and Velocity equation

Answer 19

Q=v*A