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20 Cards in this Set
- Front
- Back
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Physiologic Dead Space (Vd) equation
(provide definition of variables) |
= (Tv) x { (PaCO2 - PeCO2) / PaCO2) }
(PaCO2 = Pco2 of Alveolar air) (OR PaCO2 = Pco2 of Arterial blood) (PeCO2 = Pco2 of Expired air) |
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Ventilation Rate = ?
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= RR x Tv
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Alveolar Rate = ?
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= RR x (Tv - Vd)
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Inspiratory Capacity (IC) = ?
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= Tv + IRV
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Functional Residual Volume (FRV) = ?
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= ERV + RV
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Forced Vital Capacity (FVC) = ?
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= Tv + IRV + ERV
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Total Lunch Capacity (TLC) = ?
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= Tv + IRV + ERV + RV
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FEV1 = ?
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= 80% of FVC
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Normal FEV1/FVC =
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= 0.8
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FEV1/FVC value for Restrictive Diseases
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Normal or Increased
(both decreases) |
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FEV1/FVC value for Obstructive Diseases
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Decreased
(FEV1 decreases more than FVC) |
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Transmural Pressure = ?
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Alveolar Pressure - Intrapleural Pressure
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Atmospheric Pressure (Patm) = ?
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0 mmHg
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Collapsing Pressure (CP) = ?
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= 2T / r
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Mature Fetal Surfactant
- measured from what tissue? - level indicating mature surfactant levels |
Amniotic Fluid
2:1 for Lecithin:Sphingomyelin ratio |
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Pulmonary Airflow (Q) = ?
(define variables) |
= dP / R
dP is Pressure Difference (btw Oropharynx & Alveolar Pressure) R = airway Resistance |
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Pulmonary Airflow Resistance (R) = ?
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= (8 x length x viscosity) / (Pi x radius^4)
- b/c length & viscosity is usually constant, primary changes in resistance via change in diameter |
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Atmospheric Pressure (Patm) = ?
Alveolar Pressure = Patm when? Alveolar Pressure > Patm when? Alveolar Pressure < Patm when? |
= 0
- @ Rest - Expiration - Inspiration |
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Intrapleural Pressure is NEGATIVE @?
Intrapleural Pressure is POSITIVE @? |
ALWAYS DURING RESPIRATION
- @ Rest - Inspiration (but decreasing) - Normal Expiration (but increasing) Forced (Active) Expiration |
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Lung Volume @ Rest = ?
Lung Volume increases by how much during Inspiration? Lung Volume decreases by how much during expiration? |
= FRC ( = ERV + RV)
1 Tidal Volume unit 1 Tidal Volume unit |
