Respiratory Equations Flashcards

1
Q

Cardiac Output (CO)

A

CO = HR*SV = L/min
SV/1000 = L/min

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2
Q

Stroke Volume (SV)

A

SV = CO/HR
Units: mL/beat
CO*1000 = mL

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3
Q

Cardiac Index (CI)

A

CI = CO/BSA
Units: %

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4
Q

Oxygen Delivery (DO2)

A

DO2 = (CaO2*CO)10
Units: mL/min

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5
Q

Mean Arterial Pressure (MAP)

A

MAP = SBP + 2(DBP)/3
Units: mmHg

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6
Q

Alveolar Oxygen Tension (PAO2)

A

PAO2 = (Pb-PH2O)FiO2 - (PaCO2*1.25)
Units: mmHg
Barometric Pressure Pb(norm): 760
Water Vapor PH20 (Constant): 47

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7
Q

Alveolar-Arterial Oxygen Tension Gradient (PAaO2)

A

PAaO2 = PAO2-PaO2
Units: mmHg

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8
Q

Arterial Oxygen Content (CaO2)

A

CaO2 = (Hb1.34SaO2) + (PaO2*.003)
Units: mL/dL

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9
Q

Mixed Venous Oxygen Content (CvO2)

A

CvO2 = (Hb1.34SvO2) + (PvO2*.003)
Units: mL/dL

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10
Q

Arterial-Mixed Venous Oxygen Content Gradient (Ca-vO2)

A

Ca-vO2 = CaO2-CvO2
Units: mL/dL

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11
Q

End-Capillary Oxygen Content (CcO2)

A

CcO2 = (Hb1.34) + (PAO2.003)
Units: mL/dL

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12
Q

Oxygen Extraction Ratio (O2ER)

A

O2ER = CaO2-CvO2/CaO2
Units: %

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13
Q

Pulmonary Vascular Resistance (PVR)

A

PVR = (MPAP-PCWP)80/CO
Units: Dynes/Sec/cm^5
PVR = (MPA - PCWP)80/CO

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14
Q

Systemic Vascular Resistance (SVR)

A

SVR = (MAP-CVP)80/CO
Units: Dynes/Sec/cm^5
SVR = (MAP-RAP)80/CO

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15
Q

Deadspace-to-Tidal Volume Ratio (VD/Vt)

A

VD/Vt = (PaCO2-PeCO2/PaCO2)*100
Units: %

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16
Q

Shunt Equation (Qs/Qt)

A

Qs/Qt = CcO2-CaO2/CcO2-CvO2
Units: Vol%

17
Q

Minute Volume (VE)

A

VE = f*Vt
Units: L/min

18
Q

Tidal Volume (Vt)

A

Vt = VE/f
Units: mL/breath

19
Q

Rapid Shallow Breathing Index (RSBI)

A

RSBI = RR/Vt
Units: Breaths/Min/L (BPM/L)

20
Q

Static Compliance (Cs)

A

Cs = Vt/Plat-PEEP
Units: mL/cmH2O

21
Q

Dynamic Compliance (Cd)

A

Cd = Vt/PIP-PEEP
Units: mL/cmH2O

22
Q

Resistance Airway (RAW)

A

RAW = PIP-Pplat/Flow
Units: L/sec
Will need to convert Flow from L/min to L/sec

23
Q

Calculate needed RR to get desired PaCO2

A

Desired RR (f) = Known PaCO2 x Known RR (f)/Desired PaCO2
Units: Breaths/min

24
Q

Calculate needed VE to get desired PaCO2

A

Desired VE = Known PaCO2 x Known VE/Desired PaCO2
Units: L/min

25
Q

Calculate needed fiO2 to get desired PaO2

A

Desired fiO2 = Desired PaO2 x (Known fiO2/Known PaO2)
Units: % or .

26
Q

Oxygen Index (OI)

A

OI = ((PAWFiO2)/PaO2)100
Units: %