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32 Cards in this Set

  • Front
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pH
7.35-7.45
PaO2
80-100 mmHg
PaCO2
35-45 mmHg
HCO2
22-26 mEq/L
Base excess (BE)
+2 to -2 mEq/L
O2 Sat
95-98%
Artial blood gases
blood specimen obtained by artial puncture or drawn from artial line

identifies asid base status and compensatory mechanisms
Acid
donates hydrogen ions
base
accepts hydrogen ions
acid base balance is classified as
normal
acidotic
alkalotic
acid base balance can be altered by
respiratory components

metabolic components

either individually or in combination
FIRST STEP:

check pH

(reflects concentration of H ions in the blood)
pH <7.35 indicates ACIDOSIS

pH >7.45 indicates ALKALOSIS
acidosis
the condition of increased hydrogen ion concentration in the blood
alkalosis
the condition of decreased hydrogen ion concentration in the blood
SECOND STEP:

check PCO2

(indicator of respiratory buffering)
PCO2 <35 mmHg indicates ALKALOSIS

PCO2>45 mmHg indicates ACIDOSIS
EXAMPLES:

pH <7.35 + PCO2 >45mmHg
=respiratory acidosis
EXAMPLES:

pH >7.45 + PCO2 <35mmHg
=respiratory alkalosis
THIRD STEP:

check HCO3

(indicator of metabolic buffering)
HCO3 <22mEq/L indicates ACIDOSIS

HCO3 >2mEq/L indicates ALKALOSIS
EXAMPLES:

pH <7.35 + HCO3< 22mEq/L
metalbolic acidosis
EXAMPLES:

pH > 7.45 + HCO3 > 26mEq/L
metalbolic alkalosis
after interpreting thepH value as normal, acidotic, or alkalotic,
determine whether the respiratory or the metabolic buffering component matches the acid-base component identified by the pH
EXAMPLE:

pH of 7.2 = acidosis

PCO2 of 50mmHg =acidosis

HCO3 of 24mEq/l = normal
respiratory acidosis
EXAMPLE:
pH of 7.5 =alkalosis

PCO2 of 30 mmHg = alkalosis

HCO3 of 23mEq/L = normal
respiratory alkalosis
EXAMPLE

pH 7.25 acidosis

PCO2 42mmHg normal

HCO3 20mEq/L acidosis
metabolic acidosis
EXAMPLE

ph 7.55 alkalosis

PCO2 38mmHg normal

HCO3 30mEq/L alkalosis
metabolic alkalosis
EXAMPLE

pH 7.2 acidosis

PCO2 50mmHg acidosis

HCO3 20mEq/L acidosis
combined resp. and met. acidosis
EXAMPLE

pH 7.5 alkalosis

PCO2 30mmHg alkalosis

HCO3 30mEq/L alkalosis
combined resp. and met. alkalosis
acid base balance can be
normal
uncompensated
partially compensated
compensated
normal
normal pH

normal PCO2

normal HCO3
uncompensated
abnormal pH

abnormal PCO2

abnormal HCO3
partially compensated
abnormal pH

abnormal PCO or HCO3

pH condition (acidosis or akalosis) matches either PCO2 or HCO3, but not both
compensated
normal pH

abnormal PCO2
or
abnormal HCO3