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Physiology | Medicine (MD/DO) School Study Aid
- Characteristics
- Pulmonary Artery Blood is O2-Poor, CO2-Rich
- Two-Cell Thick Air-Blood Barrier
- CO2 Diffuses Into Air
- O2 Diffuses Into Blood
- Gases Equilibrate
- Pulmonary Vein is O2-Rich, CO2-Poor
- Thermoregulation
- Equation
- Partial Pressure of Alveolar Oxygen (PAO2)
- Partial Pressure of Oxygen in the Inspired Air (PIO2)
- PIO2 Normally Approximated = 150 mmHg
- Arterial Partial Pressure of CO2 (PaCO2)
- Respiratory Quotient (R)
- R Normally Approximated = 0.8
- PAO2 = PIO2 - (PaCO2/R)
- Tidal Volume (Vt)
- Partial Pressure of Arterial CO2 (PaCO2)
- Partial Pressure of CO2 in Expired Air (PECO2)
- VD = VT x (PaCO2-PECO2) / PaCO2
- Partial pressure of alveolar oxygen (PAO2)
- Partial Pressure of Arterial O2 (PaO2)
- Normal 10 to 15 mmHg
- Hypoxemia with an Abnormal A-a Gradient
- Diffusion problem
- Shunting (Low V/Q)
- Dead space (high V/Q)
- Evaluates Respiratory Compensation
- Used in Metabolic Acidosis
- Equation
- (HCO3 x 1.5 ) + 8 plus-minus 2 = PCO2
- Steps
- Bicarbonate (HCO3) x 1.5
- + 8
- ± 2
- = Expected Value for PCO2
- Use
- Determines Transudative vs. Exudative Source of Pleural Effusion
- Exudate if (At Least One of the Following):
- Effusion/Serum Protein Ratio > 0.5
- Effusion/Serum LDH Ratio > 0.6
- Effusion LDH > Two-thirds Upper Serum LDH Range
- Clinical Features
- Cyanosis
- Respiratory Distress
- Headache
- Lethargy
- Diagnosis
- "Chocolate-colored Blood"
- Decreased Oxygen Saturation
- Normal Partial Pressure of Arterial O2 (PaO2)
- Management
- Identify Triggers
- Methylene Blue
- Vitamin C
- Exchange Transfusion
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