![]() ![]() This value can be obtained by dividing the patient’s tidal volume by what?ħ. The physician has requested the dynamic compliance measurement for an adult patient who is receiving mechanical ventilation. After obtaining a patient’s PFT results, they have a VC of 3.4, FRC of 5.8, and an ERV of 1.2. The A-a gradient is usually around 10 mmHg.ĥ. What is the normal value of the A-a gradient? The A-a gradient is the alveolar-arterial oxygen gradient and represents the driving force of oxygen from the alveolar sac into the artery.Ĥ. What is the A-a gradient, and why is it significant? What is the patient’s airway resistance?ģ. The ventilator flow rate is set at 60 L/min. A patient receiving mechanical ventilation has a PIP of 60 cmH2O and a plateau pressure of 45 cmH2O. Minimum Flow Rate in Mechanical Ventilationįlow Rate = Minute Ventilation x I:E Ratio Sum of PartsĢ. PSV = ((Peak Pressure – Plateau Pressure) / Set Flow) x Peak Flow Pressure Support Ventilator Setting (PSV) IBW = 50 kg + (2 x Number of Inches over 5 feet) Pack Years = (Packs Smoked per Day) x (Number of Years Smoked)Ĭatheter Size = (Internal Diameter / 2) x 3Įndotracheal Tube Size Estimation in ChildrenĬelsius to Fahrenheit Temperature Conversionįahrenheit to Celsius Temperature ConversionĬelsius to Kelvins Temperature Conversion 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 VA = Respiratory Rate x (Tidal Volume – Deadspace) ![]()
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