Clinical Experience Equations list

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19 Terms

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Airway resistance (Raw)

Raw = (PIP − Pplat) / flow

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Airway resistance (Raw)

Raw = (PIP − Pplat) / flow

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Static compliance

Cstat = VT / (Pplat − total PEEP)

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Driving pressure

Pplat − total PEEP

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Total cycle time

60 / respiratory rate

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Inspiratory flow time

VT (L) / flow (L/s)

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Minute ventilation

VE = RR × VT (L)

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Alveolar ventilation

VA = RR × (VT − dead-space VT)

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Arterial O2 content

CaO2 = 1.34 × Hb × SaO2 + 0.003 × PaO2

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Oxygen delivery

DO2 = cardiac output × CaO2 × 10

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Fick cardiac output

CO = VO2 / [(CaO2 − CvO2) × 10]

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Alveolar gas equation

PAO2 = FiO2 × (PB − 47) − PaCO2/R

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P/F ratio

PaO2 / FiO2

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Oxygenation index

OI = FiO2 × mean airway pressure × 100 / PaO2

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RSBI

RR / VT (L)

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CPP

Mean arterial pressure − ICP

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RQ

VCO2 / VO2

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Weir equation

kcal/day = (3.941 × VO2 + 1.106 × VCO2) × 1.44

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Nitrogen balance

Protein/6.25 − (UUN + other specified losses)