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Resp001 ABG

ABGs

QuestionAnswer
Why do we analyze ABGs? ABG analysis gives important information to assist in the clinical management of patients with respiratory and metabolic problems
low HCO3 Kidney Disease
High PaCO2 COPD
Low PaO2 ARDS
From where do we draw? Radial Artery – most common site at which we draw ABGs
Why from radial artery Collateral circulation Allen’s test
pH represents a measurement of the overall acid-base balance and is used to assess the overall [H+] status of the blood
PaCO2 represents the arterial CO2 level and is used to assess ventilatory status
PaO2 represents the O2 tension level in the arterial blood and is used to evaluate the oxygenation status
HCO3 Represents bicarbonate level, an important buffer in the blood, and is used to evaluate the metabolic aspect of acid-base balance
BE/BD Represents the base excess (or deficit) level of the blood, and is used to indicate the metabolic aspect of acid-base balance
SaO2 Represents the level of saturation of hemoglobin (Hb) with O2 and also provides a measure of arterial oxygenation
7.35 – 7.45 pH
35 – 45mmHg PaCO2
80 – 100mmHg PaO2
22-26meq/L HCO3-
+/-2meq/L BE/BD
acidic High levels of CO2, Low pH (High H+ concentration, Low levels of HCO3
alkalotic Low levels of CO2, High pH (Low H+ concentration), High levels of HCO3
pH and PaCO2 are inversely related
pH and HCO3 are directly related
What is COMPENSATION? The altering of function of the respiratory or renal (metabolic) system in an attempt to correct for an acid-base disorder.
Hypoxemia low levels of oxygen in the blood
60-80mmHg mild hypoxemia
40-60mmHg moderate hypoxemia
<40mmHg severe hypoxemia
pH < 7.35 acidic
pH >7.45 alkalotic
PaCO2 < 35mmHg alkalotic
PaCO2 > 45mmHg acidic
HCO3 < 22meq/L acidic
HCO3 > 26meq/L alkalotic
Relationship between Minute Ventilation and ABG interpretation As Minute Ventilation increases, PaCO2 will decrease and pH will increase (Alkalosis) As Minute Ventilation decreases, PaCO2 will increase and pH will decrease (Acidosis)
Created by: 725650999
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