Every Equation you might need.

Question 1

Tabacco Use/Pack Years

Answer 1

Pack Years = #packs/Day x #years smoked

Question 2

Cerebral Perfusion Pressure (CPP)

Answer 2

CPP = MAP - ICP

Question 3

Pulse pressure

Answer 3

Sytolic Pressure - Diastolic Pressure

Question 4

Mean Arterial Pressure (MAP)

Answer 4

(2 x Diastolic) + Systolic / 3

Question 5

Cardiac Output (Qt viaFicks Equation)

Answer 5

Qt = VO2 / CaO2 - CvO2 x 10

Question 6

Cardiac Output (Qt via Stroke Volume)

Answer 6

Qt = Heart Rate x Stroke Volume

Question 7

Stroke Volume

Answer 7

Qt / Heart Rate

Question 8

Cardiac Index

Answer 8

CI = Cardiac Output (Qt) / Body Surface Area (BSA)

Question 9

Systemic Vascular Resistance (SVR)

Answer 9

(Mean Arterial Pressure(MAP) - Central Venus Pressure (CVP / Cardiac Output (Qt)

To covert To dynes, Multiply mmHg/L/min x 80

Question 10

Pulmonary Vascular Resistance (PVR)

Answer 10

PVR =( Mean Pulmonary Artery Pressure (MPAP) - Pulmonary Wedge Pressure (PWP)) / Cardiac Output (Qt)

Question 11

Mean Pulmonary Artery Pressure (MPAP)

Answer 11

MPAP = (2x Diastolic) + Sytolic / 3

Use Pulmonary Artery Pressures (PAP) for this not sytemic

Question 12

Alveolar Air Equation (PAO2)

Answer 12

PAO2 = (Pb - Ph2o) x FiO2 - PaCO2 x 1.25

Question 13

AA Gradient (A-aDO2)

Answer 13

A-aDO2 = PAO2(Alveolar) - PaO2(Arterial)

Question 14

PaO2/FiO2 Ratio (P/F Ratio)

Answer 14

PaO2 / FiO2

Question 15

CaO2 (Content of Arterial Oxygen)

Answer 15

CaO2 = (Hb x 1.34 x SaO2) + (PaO2 x .003)

Question 16

CvO2 (Content of Venous Oxygen)

Answer 16

CvO2 = (Hb x 1.34 x SvO2) + (PvO2 x .003)

Question 17

C(a-v)O2 (Oxygen Consumption)

Answer 17

C(a-v)O2 = CaO2 - CvO2

Question 18

VO2 (Rate of Oxygen Consumption)

Answer 18

VO2 = Qt x C(a-v)O2 x 10

Question 19

Qs/Qt (Shunt Equation)

Answer 19

Qs/Qt = (A-aDO2) x .003 / (A-aDO2) x .003 + C(a-v)O2

Question 20

SaO2 (Saturation of arterial Oxygen)

Answer 20

SaO2 = PaO2 + 30 (When PaO2 is between 40 & 60 Torr)

Question 21

Oxygen Index (OI)

Answer 21

OI = Paw x FiO2 / PaO2 
Paw = Airway pressure or MAP (Mean Airway Pressure)

Question 22

Deadspace Ventilation (Vd/Vt)

Answer 22

Vd/Vt = PaCO2 - PeCO2 / PaCO2 x100
PeCO2 = Pressure of End Tidal or Expired CO2

Question 23

Suction Catheter Sizing

Answer 23

Sizing = Tube Size x 3 /2