![]() ![]() ![]() Infant or Child Dose = (Age in Months / 150) x Adult DoseīSA = ((4 x Body Weight) + 7) / (Body Weight + 90)Įlastance = Change in Pressure / Change in Volume Infant and Children Dosage Estimation (Fried’s Rule) Infant Dose = (Body Weight in lbs / 150) x Adult Dose ![]() PVR = (MPAP – PCWP) x (80 / Cardiac Output)Ĭst = Tidal Volume / (Plateau Pressure – PEEP)Ĭdyn = Tidal Volume / (Peak Pressure – PEEP)Ĭhild Dose = (Age / Age + 12) x Adult Dose SVR = (MAP – CVP) x (80 / Cardiac Output) HR = 300 / # of large boxes between R waves MAP = (Systolic BP + (2 x Diastolic BP)) / 3 QS/QT = ((PAO2 – PaO2) x 0.003) / ((CaO2 – CvO2) + (PAO2 – PaO2) x 0.003)Īrterial-Mixed Venous Oxygen Content Difference (C(a-v)O2)Īrterial Oxygen Saturation Estimation (SaO2)ĭuration = (Gauge Pressure x Tank Factor) / Liter FlowĬPP = Mean Arterial Pressure – Intracranial Pressure WOB = Change in Pressure x Change in VolumeĪlveolar-Arterial Oxygen Tension Gradient (P(A-a)O2) Paw = ((Inspiratory Time x Frequency) / 60) x (PIP – PEEP) + PEEP V d V t = P A C O 2 − P e C O 2 P A C O 2 Ī common step is to then presume that the partial pressure of carbon dioxide in the end-tidal exhaled air is in equilibrium with that gas' tension in the blood that leaves the alveolar capillaries of the lung.VA = Respiratory Rate x (Tidal Volume – Deadspace) The original formulation by Bohr, required measurement of the alveolar partial pressure P A. The Bohr equation is used to quantify the ratio of physiological dead space to the total tidal volume, and gives an indication of the extent of wasted ventilation. It differs from anatomical dead space as measured by Fowler's method as it includes alveolar dead space. This is given as a ratio of dead space to tidal volume. The Bohr equation, named after Danish physician Christian Bohr (1855–1911), describes the amount of physiological dead space in a person's lungs. Not to be confused with the Bohr model or the Bohr effect. ![]()
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