Exam (elaborations)
CPFT/ RPFT Calculations- Questions and Answers
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CPFT/ RPFT Calculations- Questions and Answers
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CPFT/ RPFT Calculations- Questions and AnswersTotal Lung Capacity (TLC) Correct Ans-IRV + TV + ERV + RV
or
IC + FRC
or
VC + RV
Residual Volume/ Total Lung Capacity Ratio
(RV/TLC Ratio) Correct Ans-RV/ TLC x100
Boyle's Law Correct Ans-P1V1=P2V2
When temperature is constant
PC20% or PD20% Correct Ans-Control Value FEV1 x 0.2
% change in FEV1 (for Methacholine Challenge Testing) Correct Ans-{(Control Value -
Response Value)/ Control Value} x 100
Airway Resistance (Raw) Correct Ans-{Atmospheric (mouth) Pressure - Alveolar Pressure} /
Flow (V)
Airway Conductance (Gaw) Correct Ans-1/ Raw
, CPFT/ RPFT Calculations- Questions and Answers
Specific Conductance (SGaw) Correct Ans-(1/Raw)/ FRC or TLC
Compliance (C) Correct Ans-(change in volume/ change in pressure)
Coefficient of Retraction (COR) Correct Ans-(Pst at TLC)/TLC
DLCO Correct Ans-VCO2/PACO2
Alveolar Air Equation (PAO2) Correct Ans-(Pb-PH2O) x FiO2 - PaCO2/0.8
A-a gradient
A-a DO2 Correct Ans-PAO2-PaO2
Arterial Oxygen Content (CaO2) Correct Ans-(Hb x 1.34 x SaO2) + (PaO2 x 0.003)
Mixed Venous Oxygen Content (CvO2) Correct Ans-(Hb x 1.34 x SvO2) + (PvO2 x 0.003)
Arterial Venous Oxygen Content Difference C(a-v)O2 Correct Ans-CaO2-CvO2
Cardiac Output (Qt) Correct Ans-VO2 / C(a-v)O2 x (10)
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