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A7 acid-base (< 7.35 acidosis (h CO2: respiratory acidosis (h HCO3: v…
A7 acid-base
< 7.35 acidosis
h CO2: respiratory acidosis
h HCO3: v compensation
n HCO3: v compensation
n CO2: metabolic acidosis x respiratory compensation
l CO2: metabolic acidosis v respiratory compensation
.> 7.45 alkalosis
l CO2: respiratory alkalosis
h HCO3: v metabolic compensation
n HCO3: x metabolic compensation
n CO2: metabolic alkalosis x compensation
l CO2: metabolic alkalosis v compensation
examples
mineralocorticord excess
vomiting, diarrhea
diuretics
type I respiratory failure oxygenation
normal n PaCO2
hypoxia l PaO2
(Na+K) - (Cl+HCO3) metabolic acidosis (dec HCO3 inc Na/Cl)
n anion gap
h anion gap
ketoacidosis
diabetic ketoacidosis
alcoholic ketoacidosis
starvation
lactic acidosis
hypoxia
metformin
toxins
methanol
salicylate
type II respiratory failure ventilation
hypercapnia h PaCO2
hypoxia l PaO2
bicarbonate buffer system CO2+H2O - H2CO3 - H+HCO3
buffer acid H2CO3
α PCO2
CO2: respiratory
buffer base HCO3
pH = pKa + log [HC03]
H, HCO3: metabolic
α: 0.23: solubility constant of CO2
pKa: 6.1: dissociation constant of H2CO3