Calculations

Question 1

Pack years equation

Answer 1

of packs a day X # of years smoked

Question 2

With what equation would you determine a patients heart rate on an ECG strip?

Answer 2

HR = 300/# of large boxes between the R waves.

3 boxes = 100 b/min
5 boxes = 60 b/min

Question 3

How do you calculate the mean blood pressure (MAP)?

Answer 3

Diastolic BP x 2 + systolic BP / 3

Question 4

Pulse pressure calculation

Answer 4

Systolic - diastolic

Normal is 40, this is a garbage equation that does not have real life application

Question 5

Cardiac output (QT) equation

Fick Equation

Answer 5

VO2 /C(a-v) O2 x 10

vo2 = oxygen consumption, usually larger number
C(a-v)O2 = smaller number. Usually given

Question 6

Stroke volume equation

Answer 6

HR x Stroke volume = QT.

Change mL to L. Ex: 5000 mL = 5 L

Question 7

Cardiac Index Equation

Answer 7

Qt / BSA
This answer is normally half of the cardiac output
Ex: Qt= 5L so CI = 2.5

Question 8

Systemic Vascular Resistance equation (SVR)

Answer 8

SVR= MAP-CVP/Qt x 80

Question 9

Pulmonary Vascular Resistance (PVR) equation

Answer 9

PVR = MPAP - PCWP / Qt x 80