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How do you calculate Bicarb in respiratory acidosis?

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How do you calculate Bicarb in respiratory acidosis?

Expected [HCO3] = 24 + 4 { (Actual pCO2 – 40) / 10} Comment: With chronic acidosis, the kidneys respond by retaining HCO3, that is, renal compensation occurs. This takes a few days to reach its maximal value. Example: A patient with a chronic respiratory acidosis (pCO2 60mmHg) has an actual [HCO3] of 31mmol/l.

How is PaCO2 calculated?

PaCO2 is partial pressure of carbon dioxide in alveoli (in normal physiological conditions around 40 to 45 mmHg). RQ is the respiratory quotient. At sea level, the alveolar PAO2 is: PaO2 = (760 – 47) 0.21 – 40/0.8 = 99.7 mm Hg.

What is the respiratory acidosis?

Respiratory acidosis is a condition that occurs when the lungs cannot remove all of the carbon dioxide the body produces. This causes body fluids, especially the blood, to become too acidic.

How is respiratory compensation calculated?

To review, Winter’s Formula is used to predict the PaCO2 which should result if there is appropriate respiratory compensation for a metabolic acidosis: predicted PaCO2 = 1.5 x [HCO3-] + 8.

How do you calculate acidosis?

III. Calculation: Calculated PaCO2 in Metabolic Conditions

  1. Metabolic Acidosis with expected compensation. PaCO2 = 1.5 x HCO3 + 8 (+/- 2) PaCO2Delta = 1.2 x BicarbDelta. PaCO2 will not typically drop below 10 mmHg in respiratory compensation.
  2. Metabolic Alkalosis with expected compensation. PaCO2 = 0.7 x HCO3 + 20 (+/- 1.5)

How do you calculate HCO3 from pH and PCO2?

Henderson Hasselbalch equation

  1. Normal values: HCO3: 22-26 meq/L. PCO2: 35 – 45 mmHg. pH: 7.35 – 7.45.
  2. Quick derivation: Carbonic acid (H2CO3) equilibrium: [H+] x [HCO3-] <—> [H2CO3] <—> [CO2] x [H2O] [H+] x [HCO3-] = K x [CO2] x [H2O]
  3. Final: pH = 6.1 +log (HCO3-/ (0.03 x PCO2))

How do you calculate arterial oxygen?

59274-1Oxygen content in Arterial blood by calculationActive but in clinical care it is mostly (or always) produced via a calculation via the formula: Oxygen content+ Sa02 x 1.34 x Hb + . 003 x PO2 and measured in mL/dL.

How is respiratory acidosis compensation calculated?

How do you calculate the anion gap?

Expressed in words, the equation is: Anion Gap = Sodium – (Chloride + Bicarbonate) which is logically equivalent to: Anion Gap = (the most prevalent cation) minus (the sum of the most prevalent anions)

How do you calculate compensation for respiratory acidosis?

How do you calculate pH from pCO2?

Background:

  1. Normal values: HCO3: 22-26 meq/L. PCO2: 35 – 45 mmHg. pH: 7.35 – 7.45.
  2. Quick derivation: Carbonic acid (H2CO3) equilibrium: [H+] x [HCO3-] <—> [H2CO3] <—> [CO2] x [H2O] [H+] x [HCO3-] = K x [CO2] x [H2O]
  3. Final: pH = 6.1 +log (HCO3-/ (0.03 x PCO2))

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