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Observational acid–base patterns |
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| Disorder |
HCO3- (mmol/l) |
pCO2 (mmHg) |
SBE (mmol/I) |
|
|
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| Metabolic acidosis |
<22 |
= (1.5 × HCO3-) + 8 |
<-5 |
| = 40 + SBE |
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| Metabolic alkalosis |
>26 |
= (0.7 × HCO3-) + 21 |
>+5 |
| = 40 + (0.6 × SBE) |
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| Acute respiratory acidosis |
= [(pCO2 – 40)/10] + 24 |
>45 |
= 0 |
| Chronic respiratory acidosis |
= [(pCO2 – 40)/3] + 24 |
>45 |
= 0.4 × (pCO2 – 40) |
| Acute respiratory alkalosis |
= [(40 – pCO2)/5] + 24 |
<35 |
= 0 |
| Chronic respiratory alkalosis |
= [(40 – pCO2)/2] + 24 |
<35 |
= 0.4 × (pCO2 – 40) |
|
Compiled from various sources. The changes in SBE were taken fromSchlichtig et al [7]. pCO2, partialcarbon dioxide tension; SBE, standard base excess. | |||
Kellum Critical Care 2000 4:6 doi:10.1186/cc644 |
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