TMC - Kettering - Calculations

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Last updated 9:37 PM on 6/22/26
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51 Terms

1
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Tobacco Use (Pack Years)

packs/day (x) years smoked

2
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Cerebral Prefusion Pressure CPP

MAP - ICP

MAP (Mean Arterial Pressure)

ICP (Intracranial Pressure)

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Estimating heart rate from an ECG tracing

300/# of large boxes between R waves or

1500/# of small boxes between R waves

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Cardiac Index (CI)

CI = Cardiac Output / Body Surface Area

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Mean Arterial Pressure (MAP)

[(2 x diastolic) + systolic] / 3

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Cardiac Output (CO) (Fick Equation)

QT = VO2/C(a-v) O2 (10)

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Cardiac Output (Stroke Volume Equation)

heart rate x stroke volume

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Stroke Volume Equation

Qt/HR

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Pulse Pressure (PP)

systolic pressure - diastolic pressure

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Systemic Vascular Resistance (SVR)

(MAP - CVP) / Cardiac Output

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Pulmonary Vascular Resistance (PVR)

(MPAP - CVP) / Cardiac Output

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To convert mm Hg/L/min to Dynes/sec/cm

Multiply mm Hg/L/min by 80

13
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PaO2

(Pb - PH2O) X Fio2 - PaCO2/0.8

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A - a DO2

PAO2 - PaO2

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PaO2/FiO2 ratio (P/F Ratio)

PaO2/FiO2

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CaO2

(Hb x 1.34 x SaO2) + (PaO2 x 0.003)

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CvO2

CaO2 - CvO2

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Qt

VO2/C(a-v)O2(10)

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VO2

QT x C(a-v)O2 x 10

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Qs/Qt

(A-aDO2) x 0.003 / (A-aDO2) x 0.003 + C(a-v)O2

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SaO2

PaO2 + 30 (when PaO2 is between 40 and 60 torr)

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Oxygen Index (OI)

PAW X FiO2/PaO2 X 100

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VD/VT Ratio

PaCo2 -PECO2/ PaCO2 x 100

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Desired Minute Volume

(VE x PaCO2) = (VE x PaCO2)

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Suction Catheter Size

(ID size / 2) x 3

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Exhaled Tidal Volume

Ve / F

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Alveolar Minute Ventilation

(VT - VD) x f

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Minute Ventilation

Vt x f

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Dynamic Compliance

Exhaled Vt/PIP-PEEP

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Static Compliance

Vt / (Plateau - PEEP)

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Airway Resistance (Raw)

Peak Pressure - Plateau Pressure

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Ideal Body Weight

50 kg + (2x inches over 5ft)

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Work of Breathing (WOB)

change in pressure x change in volume

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Rapid Shallow Breathing Index (RSBI)

RR / Vt (L)

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FiO2 w/ nasal cannula

20 + (4 x Liter flow)

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Duration of Flow

(gauge pressure (psi) x tank factor) / liter flow

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Tank Factors

E cylinder

H cylinder

E cylinder = .28 L/psi (0.3)

H cylinder = 3.14 L/psi (3.0)

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Total Flow

O2 flow x flow factor

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Air - Oxygen Entrainment Ratio - 24%

25:1

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Air - Oxygen Entrainment Ratio - 28%

10:1

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Air - Oxygen Entrainment Ratio - 32%

6:1

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Air - Oxygen Entrainment Ratio - 35%

4.6:1

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Air - Oxygen Entrainment Ratio - 36%

4:1

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Magic box for AEM

100% - desired FiO2 = exp

Desired -21% = insp

Ratio = I+E = parts

Parts x O2 flow = actual flow

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% Change Drug Flow

(After drug airflow - before air drug flow / before air drug flow ) x 100

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Pt’s predicted

(pt’s test result/ pt’s predicted) x 100

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Calc Ti and Te

60s/min / x breaths/min = resp cycle →

x resp cycle/ I + E parts = x sec per one part →

multiply I or E with amount fo seconds per one part = Ti and Te

48
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He/O2 mixtures using an oxygen flowmeter

actual flow = indicated flow x factor

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Volume Lost Through Chest Tubes

Delivered Tidal Volume - Exhaled Tidal Volume

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Maximum Heart Rate (MHR)

220-age

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factors for He/O2 mixtures

80/20 - 1.8

70/30 - 1.6