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30 Cards in this Set
- Front
- Back
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Describe Fick's Law
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It is inversely related to the thickness across the lung membranne.
Think Think = Thick |
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How Would you get a PVO2 reading?
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From a Swanz Ganz Catheter.
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What can the P(A-a)02 gradient used to estimate?
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1. the degree of hypoxemia.
2. The degree of Physiological shunt. |
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When is the P(A-a)O2 increased?
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When Hypoxemia is due to V/Q Mismatching, diffusion defect, or shunt. In the absence of Cardiopulmonary Disease, it increases with aging.
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Calculate PA02.
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PA02= (PB-PH20)x FIO2 (Paco2x 1.25)
Note- drop the 1.25 if fio2 is over 60. *watch this on tests* |
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Water vapor pressure is how much?
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47mmhg saturated at 37C
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What is the normal Respiratory Exchange Ratio?
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1.25 or 0.8.
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What is the A/a ratio an Indicator of?
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The effiency of O2 transfer.
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A low A/a Ratio reflects what?
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V/Q Mismatching, diffusion defect, or shunt.
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What is the Normal value for the A/a Ratio?
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>60%
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What is the normal value for P(A-a)o2.
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On room air it should be less than 4 mmhg for every 10 years in age.
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What is the normal value for PA02?
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It varies according to he Fi02.
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What Is the C(a-v)o2 useful for?
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changes is o2 consumption and Cardiac Output.
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The normal o2 content difference between arterial and venous blood is about what percentage?
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<5% normal patients
>6% critically ill patients with out cardiovascular compensation. |
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What are some factors that INCREASE the C(a-v)02?
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increased O@ consumption
Excersise Seizures Shivering in post op patient Hyperthermia. |
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Factors that DECREASE C(a-v)02.
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Increased Cardiac Output
Skeletal relaxation (induced by drugs) Peripheral shunting (sepsis, trauma) Certain Poisions (cyanide) Hypothermia |
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Calculate V02 (oxygen consumption)amt of 02 extracted from the tissues in one minute.
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Vo2= QT(C(a-v)02 x 10)
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What is the normal VO2?
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200-350 ml / minute
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What are factors that INCREASE Oxygen consumption?
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Exercise
Seizures Shivering (post op pt) Hyperthermia |
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What are factors that DECREASE oxygen consumption?
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Skeletal Relaxation
Peripheral Shunting Certain Poisions (Cyanide) Hypthermia |
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What does Ca02 reflect?
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The overall carrying capacity of oxygen arterial blood.
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Calculate Ca02?
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Ca02=(Hbx1.34xSao2) + Pao2 x 0.003)
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What is the Normal value for Ca02?
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16-20 V%
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Which calculation requires a PA02 value?
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Ca02
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Calculate the 02ER.
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O2ER = Cao2-CVO2/CAO2
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What is the normal value for 02ER?
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20-28%
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What is the 02ER useful for?
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Patients oxygen transport status?
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What is the classic shunt equation used for?
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To calculate the portion of Cardiac output not taking part in gas exchange.
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Calculate MV.
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RR x VT = MV
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When would you have a Increased VQ mismatch?
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Pulmonary Emboli and Increase CO.
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